[syzbot] KASAN: use-after-free Read in rxrpc_destroy_all_locals

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 01d0e110f236 Merge branch 'net-lan966x-enable-ptp-on-bridg..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16af79d5880000
kernel config: https://syzkaller.appspot.com/x/.config?x=c608c21151db14f2
dashboard link: https://syzkaller.appspot.com/bug?extid=1eb4232fca28c0a6d1c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/45e7d33efabe/disk-01d0e110.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bb13aac486ae/vmlinux-01d0e110.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3fb366429f3d/bzImage-01d0e110.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1eb423...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline]
BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline]
BUG: KASAN: use-after-free in rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434
Read of size 4 at addr ffff88807bd82814 by task kworker/u4:3/46

CPU: 0 PID: 46 Comm: kworker/u4:3 Not tainted 6.1.0-rc7-syzkaller-01815-g01d0e110f236 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: netns cleanup_net
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:395
kasan_report+0xbf/0x1f0 mm/kasan/report.c:495
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x141/0x190 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:72 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
refcount_read include/linux/refcount.h:147 [inline]
rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434
rxrpc_exit_net+0x174/0x300 net/rxrpc/net_ns.c:128
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>

Allocated by task 13847:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:553 [inline]
kzalloc include/linux/slab.h:689 [inline]
rxrpc_alloc_local net/rxrpc/local_object.c:93 [inline]
rxrpc_lookup_local+0x4d9/0xfb0 net/rxrpc/local_object.c:249
rxrpc_bind+0x35e/0x5c0 net/rxrpc/af_rxrpc.c:150
afs_open_socket+0x1b4/0x360 fs/afs/rxrpc.c:64
afs_net_init+0xa79/0xed0 fs/afs/main.c:126
ops_init+0xb9/0x680 net/core/net_namespace.c:135
setup_net+0x793/0xe60 net/core/net_namespace.c:333
copy_net_ns+0x31b/0x6b0 net/core/net_namespace.c:483
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc5/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x449/0x920 kernel/fork.c:3188
__do_sys_unshare kernel/fork.c:3259 [inline]
__se_sys_unshare kernel/fork.c:3257 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3257
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 15:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:511
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0xaf/0x3b0 mm/slub.c:3674
rcu_do_batch kernel/rcu/tree.c:2250 [inline]
rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2510
__do_softirq+0x1fb/0xadc kernel/softirq.c:571

Last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798
rxrpc_put_local.part.0+0x128/0x170 net/rxrpc/local_object.c:332
rxrpc_put_local+0x25/0x30 net/rxrpc/local_object.c:324
rxrpc_release_sock net/rxrpc/af_rxrpc.c:888 [inline]
rxrpc_release+0x237/0x550 net/rxrpc/af_rxrpc.c:914
__sock_release net/socket.c:650 [inline]
sock_release+0x8b/0x1b0 net/socket.c:678
afs_close_socket+0x1ce/0x330 fs/afs/rxrpc.c:125
afs_net_exit+0x179/0x320 fs/afs/main.c:158
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Second to last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
kvfree_call_rcu+0x78/0x8f0 kernel/rcu/tree.c:3343
neigh_destroy+0x435/0x640 net/core/neighbour.c:931
neigh_release include/net/neighbour.h:449 [inline]
neigh_cleanup_and_release+0x271/0x3d0 net/core/neighbour.c:103
neigh_periodic_work+0x616/0x9f0 net/core/neighbour.c:1013
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

The buggy address belongs to the object at ffff88807bd82800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 20 bytes inside of
1024-byte region [ffff88807bd82800, ffff88807bd82c00)

The buggy address belongs to the physical page:
page:ffffea0001ef6000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bd80
head:ffffea0001ef6000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888012041dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3623, tgid 3623 (syz-fuzzer), ts 86395494821, free_ts 86393423061
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291
__alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
alloc_slab_page mm/slub.c:1794 [inline]
allocate_slab+0x213/0x300 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3180
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x199/0x3e0 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:975
kmalloc_reserve net/core/skbuff.c:438 [inline]
__alloc_skb+0xe9/0x310 net/core/skbuff.c:511
alloc_skb include/linux/skbuff.h:1269 [inline]
__tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3957
__tcp_send_ack net/ipv4/tcp_output.c:3989 [inline]
tcp_send_ack+0x81/0xa0 net/ipv4/tcp_output.c:3989
__tcp_cleanup_rbuf+0x356/0x470 net/ipv4/tcp.c:1617
tcp_recvmsg_locked+0x72c/0x22b0 net/ipv4/tcp.c:2649
tcp_recvmsg+0x117/0x620 net/ipv4/tcp.c:2679
inet_recvmsg+0x114/0x5e0 net/ipv4/af_inet.c:861
sock_recvmsg_nosec net/socket.c:995 [inline]
sock_recvmsg net/socket.c:1013 [inline]
sock_recvmsg net/socket.c:1009 [inline]
sock_read_iter+0x348/0x480 net/socket.c:1086
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483
skb_free_frag include/linux/skbuff.h:3192 [inline]
skb_free_head+0x96/0x110 net/core/skbuff.c:766
skb_release_data+0x5f4/0x870 net/core/skbuff.c:797
skb_release_all net/core/skbuff.c:862 [inline]
__kfree_skb net/core/skbuff.c:876 [inline]
skb_attempt_defer_free+0x309/0x3e0 net/core/skbuff.c:6651
tcp_eat_recv_skb net/ipv4/tcp.c:1638 [inline]
tcp_recvmsg_locked+0x124e/0x22b0 net/ipv4/tcp.c:2633
tcp_recvmsg+0x117/0x620 net/ipv4/tcp.c:2679
inet_recvmsg+0x114/0x5e0 net/ipv4/af_inet.c:861
sock_recvmsg_nosec net/socket.c:995 [inline]
sock_recvmsg net/socket.c:1013 [inline]
sock_recvmsg net/socket.c:1009 [inline]
sock_read_iter+0x348/0x480 net/socket.c:1086
call_read_iter include/linux/fs.h:2193 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x7fa/0x930 fs/read_write.c:470
ksys_read+0x1ec/0x250 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
ffff88807bd82700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807bd82780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807bd82800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807bd82880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807bd82900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 591cd61541b9 Add linux-next specific files for 20221207
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=155a05f5880000
kernel config: https://syzkaller.appspot.com/x/.config?x=8b2d3e63e054c24f

dashboard link: https://syzkaller.appspot.com/bug?extid=1eb4232fca28c0a6d1c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c2defb880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bc862c01ec56/disk-591cd615.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8f9b93f8ed2f/vmlinux-591cd615.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9d5cb636d548/bzImage-591cd615.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1eb423...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline]
BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline]
BUG: KASAN: use-after-free in rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434

Read of size 4 at addr ffff888026e83014 by task kworker/u4:9/5238

CPU: 0 PID: 5238 Comm: kworker/u4:9 Not tainted 6.1.0-rc8-next-20221207-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: netns cleanup_net
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106

print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:417
kasan_report+0xbf/0x1f0 mm/kasan/report.c:517

check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x141/0x190 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:72 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
refcount_read include/linux/refcount.h:147 [inline]
rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434
rxrpc_exit_net+0x174/0x300 net/rxrpc/net_ns.c:128
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376

ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>

Allocated by task 5495:

kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380

kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]

rxrpc_alloc_local net/rxrpc/local_object.c:93 [inline]
rxrpc_lookup_local+0x4d9/0xfb0 net/rxrpc/local_object.c:249
rxrpc_bind+0x35e/0x5c0 net/rxrpc/af_rxrpc.c:150
afs_open_socket+0x1b4/0x360 fs/afs/rxrpc.c:64
afs_net_init+0xa79/0xed0 fs/afs/main.c:126
ops_init+0xb9/0x680 net/core/net_namespace.c:135
setup_net+0x793/0xe60 net/core/net_namespace.c:333
copy_net_ns+0x31b/0x6b0 net/core/net_namespace.c:483
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110

copy_namespaces+0x3b3/0x4a0 kernel/nsproxy.c:179
copy_process+0x30d3/0x75c0 kernel/fork.c:2269
kernel_clone+0xeb/0xa40 kernel/fork.c:2681
__do_sys_clone3+0x1d1/0x370 kernel/fork.c:2980

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 5507:

kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52

kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518

____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]

slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
__kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800
rcu_do_batch kernel/rcu/tree.c:2244 [inline]
rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2504

__do_softirq+0x1fb/0xadc kernel/softirq.c:571

Last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45

__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
__call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753

rxrpc_put_local.part.0+0x128/0x170 net/rxrpc/local_object.c:332
rxrpc_put_local+0x25/0x30 net/rxrpc/local_object.c:324
rxrpc_release_sock net/rxrpc/af_rxrpc.c:888 [inline]
rxrpc_release+0x237/0x550 net/rxrpc/af_rxrpc.c:914
__sock_release net/socket.c:650 [inline]
sock_release+0x8b/0x1b0 net/socket.c:678
afs_close_socket+0x1ce/0x330 fs/afs/rxrpc.c:125
afs_net_exit+0x179/0x320 fs/afs/main.c:158
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376

ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff888026e83000

which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 20 bytes inside of

1024-byte region [ffff888026e83000, ffff888026e83400)

The buggy address belongs to the physical page:

page:ffffea00009ba000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26e80
head:ffffea00009ba000 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0
anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012441dc0 0000000000000000 dead000000000001

raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated

page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 5118, tgid 5118 (kworker/1:0), ts 447318827019, free_ts 439289003379
prep_new_page mm/page_alloc.c:2531 [inline]
get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
__slab_alloc_node mm/slub.c:3345 [inline]
slab_alloc_node mm/slub.c:3442 [inline]
__kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491
__do_kmalloc_node mm/slab_common.c:967 [inline]
__kmalloc+0x4a/0xd0 mm/slab_common.c:981
kmalloc include/linux/slab.h:584 [inline]
kzalloc include/linux/slab.h:720 [inline]
neigh_alloc net/core/neighbour.c:476 [inline]
___neigh_create+0x1578/0x2a20 net/core/neighbour.c:661
ip6_finish_output2+0xfc4/0x1530 net/ipv6/ip6_output.c:125
__ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206
NF_HOOK_COND include/linux/netfilter.h:291 [inline]
ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
dst_output include/net/dst.h:444 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xa63/0x1740 net/ipv6/ndisc.c:508
ndisc_send_rs+0x132/0x6f0 net/ipv6/ndisc.c:718
addrconf_dad_completed+0x37a/0xda0 net/ipv6/addrconf.c:4248
addrconf_dad_work+0x75d/0x12d0 net/ipv6/addrconf.c:4157

page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]

free_pages_prepare mm/page_alloc.c:1446 [inline]
free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496
free_unref_page_prepare mm/page_alloc.c:3369 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3464
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:761 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
kmem_cache_alloc_node+0x1f1/0x460 mm/slub.c:3497
__alloc_skb+0x216/0x310 net/core/skbuff.c:498
alloc_skb include/linux/skbuff.h:1269 [inline]
nlmsg_new include/net/netlink.h:1002 [inline]
netlink_ack+0x184/0x1370 net/netlink/af_netlink.c:2501
netlink_rcv_skb+0x34f/0x440 net/netlink/af_netlink.c:2570
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
__sys_sendto+0x23a/0x340 net/socket.c:2117
__do_sys_sendto net/socket.c:2129 [inline]
__se_sys_sendto net/socket.c:2125 [inline]
__x64_sys_sendto+0xe1/0x1b0 net/socket.c:2125

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:

ffff888026e82f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888026e82f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888026e83000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888026e83080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888026e83100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

[Hillf Danton]

On 07 Dec 2022 18:37:37 -0800

> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 591cd61541b9 Add linux-next specific files for 20221207
> git tree: linux-next

> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c2defb880000

Delete local ep from hlist before freeing it.

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 591cd61541b9

--- x/net/rxrpc/ar-internal.h
+++ y/net/rxrpc/ar-internal.h
@@ -299,6 +299,7 @@ struct rxrpc_local {
bool dead;
bool service_closed; /* Service socket closed */
struct sockaddr_rxrpc srx; /* local address */
+ struct work_struct destroy_work;
};

/*
--- x/net/rxrpc/local_object.c
+++ y/net/rxrpc/local_object.c
@@ -312,6 +312,20 @@ struct rxrpc_local *rxrpc_get_local_mayb
return NULL;
}

+static void rxrpc_local_destroy_workfn(struct work_struct *w)
+{
+ struct rxrpc_local *local = container_of(w, struct rxrpc_local, destroy_work);
+ struct rxrpc_net *rxnet = local->rxnet;
+
+ mutex_lock(&rxnet->local_mutex);
+ if (!hlist_unhashed(&local->link))
+ hlist_del_init_rcu(&local->link);
+ mutex_unlock(&rxnet->local_mutex);
+
+ rxrpc_see_local(local, rxrpc_local_free);
+ kfree(local);
+}
+
/*
* Drop a ref on a local endpoint.
*/
@@ -328,8 +342,10 @@ void rxrpc_put_local(struct rxrpc_local
dead = __refcount_dec_and_test(&local->ref, &r);
trace_rxrpc_local(debug_id, why, r, u);

- if (dead)
- call_rcu(&local->rcu, rxrpc_local_rcu);
+ if (!dead)
+ return;
+ INIT_WORK(&local->destroy_work, rxrpc_local_destroy_workfn);
+ schedule_work(&local->destroy_work);
}
}

--

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: rcu detected stall in corrupted

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P5546 } 2655 jiffies s: 2813 root: 0x0/T
rcu: blocking rcu_node structures (internal RCU debug):


Tested on:

commit: 591cd615 Add linux-next specific files for 20221207
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=177df597880000

kernel config: https://syzkaller.appspot.com/x/.config?x=8b2d3e63e054c24f
dashboard link: https://syzkaller.appspot.com/bug?extid=1eb4232fca28c0a6d1c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=1348317b880000

[David Howells]

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/ afs-testing

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: rcu detected stall in corrupted

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P4104 } 2661 jiffies s: 2777 root: 0x0/T

rcu: blocking rcu_node structures (internal RCU debug):


Tested on:

commit: efb7555b rxrpc: Fix I/O thread stop
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/ afs-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=16b83997880000
kernel config: https://syzkaller.appspot.com/x/.config?x=fb14358c9774adf3

dashboard link: https://syzkaller.appspot.com/bug?extid=1eb4232fca28c0a6d1c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.

[Hillf Danton]

On 07 Dec 2022 18:37:37 -0800

> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 591cd61541b9 Add linux-next specific files for 20221207
> git tree: linux-next

--- x/kernel/rcu/tree_plugin.h
+++ y/kernel/rcu/tree_plugin.h
@@ -156,6 +156,7 @@ static void rcu_preempt_ctxt_queue(struc
(rnp->qsmask & rdp->grpmask ? RCU_GP_BLKD : 0) +
(rnp->expmask & rdp->grpmask ? RCU_EXP_BLKD : 0);
struct task_struct *t = current;
+ int w = 0;

raw_lockdep_assert_held_rcu_node(rnp);
WARN_ON_ONCE(rdp->mynode != rnp);
@@ -183,6 +184,7 @@ static void rcu_preempt_ctxt_queue(struc
* blocking the already-waiting GPs.
*/
list_add(&t->rcu_node_entry, &rnp->blkd_tasks);
+ w = 1;
break;

case RCU_EXP_BLKD:
@@ -201,6 +203,7 @@ static void rcu_preempt_ctxt_queue(struc
* already queued tasks that are not blocking it.
*/
list_add_tail(&t->rcu_node_entry, &rnp->blkd_tasks);
+ w = 1;
break;

case RCU_EXP_TASKS + RCU_EXP_BLKD:
@@ -262,6 +265,7 @@ static void rcu_preempt_ctxt_queue(struc
rcu_report_exp_rdp(rdp);
else
WARN_ON_ONCE(rdp->cpu_no_qs.b.exp);
+ WARN_ON_ONCE(w);
}

/*
--

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:


[ 2.937831][ T1] usbcore: registered new device driver usb
[ 2.940515][ T1] mc: Linux media interface: v0.10
[ 2.941771][ T1] videodev: Linux video capture interface: v2.00
[ 2.943596][ T1] pps_core: LinuxPPS API ver. 1 registered
[ 2.944527][ T1] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giom...@linux.it>
[ 2.946605][ T1] PTP clock support registered
[ 2.951547][ T1] EDAC MC: Ver: 3.0.0
[ 2.953736][ T1] Advanced Linux Sound Architecture Driver Initialized.
[ 2.960050][ T1] Bluetooth: Core ver 2.22
[ 2.961238][ T1] NET: Registered PF_BLUETOOTH protocol family
[ 2.961612][ T1] Bluetooth: HCI device and connection manager initialized
[ 2.962826][ T1] Bluetooth: HCI socket layer initialized
[ 2.963825][ T1] Bluetooth: L2CAP socket layer initialized
[ 2.964934][ T1] Bluetooth: SCO socket layer initialized
[ 2.966318][ T1] NET: Registered PF_ATMPVC protocol family
[ 2.967228][ T1] NET: Registered PF_ATMSVC protocol family
[ 2.968490][ T1] NetLabel: Initializing
[ 2.969303][ T1] NetLabel: domain hash size = 128
[ 2.970195][ T1] NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO
[ 2.972058][ T1] NetLabel: unlabeled traffic allowed by default
[ 2.981502][ T1] nfc: nfc_init: NFC Core ver 0.1
[ 2.982842][ T1] NET: Registered PF_NFC protocol family
[ 2.984011][ T1] PCI: Using ACPI for IRQ routing
[ 2.985797][ T1] pci 0000:00:05.0: vgaarb: setting as boot VGA device
[ 2.987280][ T1] pci 0000:00:05.0: vgaarb: bridge control possible
[ 2.988369][ T1] pci 0000:00:05.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
[ 2.989937][ T1] vgaarb: loaded
[ 3.000062][ T1] clocksource: Switched to clocksource kvm-clock
[ 3.001536][ T1] VFS: Disk quotas dquot_6.6.0
[ 3.001536][ T1] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[ 3.001536][ T1] FS-Cache: Loaded
[ 3.002551][ T1] CacheFiles: Loaded
[ 3.004084][ T1] TOMOYO: 2.6.0
[ 3.004941][ T1] Mandatory Access Control activated.
[ 3.009559][ T1] AppArmor: AppArmor Filesystem Enabled
[ 3.011128][ T1] pnp: PnP ACPI init
[ 3.032175][ T1] pnp: PnP ACPI: found 7 devices
[ 3.083183][ T1] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
[ 3.088040][ T1] NET: Registered PF_INET protocol family
[ 3.094841][ T1] IP idents hash table entries: 131072 (order: 8, 1048576 bytes, vmalloc)
[ 3.110512][ T1] tcp_listen_portaddr_hash hash table entries: 4096 (order: 6, 294912 bytes, vmalloc)
[ 3.113663][ T1] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, vmalloc)
[ 3.116780][ T1] TCP established hash table entries: 65536 (order: 7, 524288 bytes, vmalloc)
[ 3.130478][ T1] TCP bind hash table entries: 65536 (order: 11, 9437184 bytes, vmalloc hugepage)
[ 3.142703][ T1] TCP: Hash tables configured (established 65536 bind 65536)
[ 3.147597][ T1] MPTCP token hash table entries: 8192 (order: 7, 720896 bytes, vmalloc)
[ 3.151843][ T1] UDP hash table entries: 4096 (order: 7, 655360 bytes, vmalloc)
[ 3.155822][ T1] UDP-Lite hash table entries: 4096 (order: 7, 655360 bytes, vmalloc)
[ 3.159404][ T1] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 3.163440][ T1] RPC: Registered named UNIX socket transport module.
[ 3.164606][ T1] RPC: Registered udp transport module.
[ 3.165516][ T1] RPC: Registered tcp transport module.
[ 3.166414][ T1] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 3.172670][ T1] NET: Registered PF_XDP protocol family
[ 3.173679][ T1] pci_bus 0000:00: resource 4 [io 0x0000-0x0cf7 window]
[ 3.174862][ T1] pci_bus 0000:00: resource 5 [io 0x0d00-0xffff window]
[ 3.175965][ T1] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
[ 3.177141][ T1] pci_bus 0000:00: resource 7 [mem 0xc0000000-0xfebfefff window]
[ 3.180502][ T1] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[ 3.182335][ T1] PCI: CLS 0 bytes, default 64
[ 3.190078][ T1] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[ 3.191932][ T1] software IO TLB: mapped [mem 0x00000000b5800000-0x00000000b9800000] (64MB)
[ 3.193805][ T1] ACPI: bus type thunderbolt registered
[ 3.207806][ T57] kworker/u4:2 (57) used greatest stack depth: 27944 bytes left
[ 3.210957][ T1] RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters, 10737418240 ms ovfl timer
[ 3.234225][ T1] kvm: already loaded vendor module 'kvm_intel'
[ 3.235402][ T1] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x1fb6c613963, max_idle_ns: 440795245426 ns
[ 3.238170][ T1] clocksource: Switched to clocksource tsc
[ 6.801690][ T11] ------------[ cut here ]------------
[ 6.802753][ T11] WARNING: CPU: 1 PID: 11 at kernel/rcu/tree_plugin.h:268 rcu_note_context_switch+0x8fb/0x1840
[ 6.804489][ T11] Modules linked in:
[ 6.805126][ T11] CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.0-rc8-next-20221207-syzkaller-dirty #0
[ 6.806902][ T11] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 6.808814][ T11] Workqueue: eval_map_wq tracer_init_tracefs_work_func
[ 6.810794][ T11] RIP: 0010:rcu_note_context_switch+0x8fb/0x1840
[ 6.811565][ T11] Code: 83 e2 07 85 c9 0f 84 f8 02 00 00 38 d0 7f 08 84 c0 0f 85 ce 08 00 00 80 7b 11 00 0f 85 e0 06 00 00 45 85 ff 0f 84 9b f8 ff ff <0f> 0b e9 94 f8 ff ff 48 8d 7b 20 c6 43 11 00 48 b8 00 00 00 00 00
[ 6.811565][ T11] RSP: 0000:ffffc900001076d8 EFLAGS: 00010002
[ 6.811565][ T11] RAX: 0000000000000000 RBX: ffff8880b993c440 RCX: 0000000000000000
[ 6.811565][ T11] RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001
[ 6.811565][ T11] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8c79be43
[ 6.811565][ T11] R10: fffffbfff18f37c8 R11: ffffffff8c79bf00 R12: ffffffff8c79be40
[ 6.811565][ T11] R13: ffff8880b993c460 R14: ffff8880b993c451 R15: 0000000000000001
[ 6.811565][ T11] FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
[ 6.811565][ T11] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6.811565][ T11] CR2: 0000000000000000 CR3: 000000000c48e000 CR4: 00000000003506e0
[ 6.811565][ T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 6.811565][ T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 6.811565][ T11] Call Trace:
[ 6.811565][ T11] <TASK>
[ 6.811565][ T11] ? lockdep_hardirqs_off+0x94/0xd0
[ 6.811565][ T11] ? preempt_schedule_notrace+0x5f/0xe0
[ 6.811565][ T11] __schedule+0x24c/0x5450
[ 6.811565][ T11] ? lock_chain_count+0x20/0x20
[ 6.811565][ T11] ? lock_chain_count+0x20/0x20
[ 6.811565][ T11] ? io_schedule_timeout+0x150/0x150
[ 6.811565][ T11] ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 6.811565][ T11] ? lockdep_hardirqs_on+0x7d/0x100
[ 6.811565][ T11] ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 6.811565][ T11] ? preempt_schedule_notrace_thunk+0x1a/0x20
[ 6.811565][ T11] preempt_schedule_notrace+0x5f/0xe0
[ 6.811565][ T11] preempt_schedule_notrace_thunk+0x1a/0x20
[ 6.811565][ T11] lock_acquire+0x516/0x630
[ 6.811565][ T11] ? lock_release+0x810/0x810
[ 6.811565][ T11] ? find_held_lock+0x2d/0x110
[ 6.811565][ T11] ? lookup_dcache+0x1e/0x130
[ 6.811565][ T11] __d_lookup+0xa9/0x460
[ 6.811565][ T11] ? __d_lookup+0x67/0x460
[ 6.811565][ T11] d_lookup+0xdc/0x170
[ 6.811565][ T11] lookup_dcache+0x1e/0x130
[ 6.811565][ T11] lookup_one_len+0x154/0x1a0
[ 6.811565][ T11] ? try_lookup_one_len+0x190/0x190
[ 6.811565][ T11] ? down_write_killable+0x250/0x250
[ 6.811565][ T11] ? do_raw_spin_unlock+0x175/0x230
[ 6.811565][ T11] ? mntput+0x10/0x90
[ 6.811565][ T11] start_creating+0x112/0x270
[ 6.811565][ T11] tracefs_create_file+0x98/0x600
[ 6.811565][ T11] trace_create_file+0x33/0x50
[ 6.811565][ T11] event_create_dir+0xaea/0x1330
[ 6.811565][ T11] __trace_early_add_event_dirs+0x7e/0xf0
[ 6.811565][ T11] event_trace_init+0x87/0xfc
[ 6.811565][ T11] tracer_init_tracefs_work_func+0x12/0x2bb
[ 6.811565][ T11] process_one_work+0x9bf/0x1710
[ 6.811565][ T11] ? pwq_dec_nr_in_flight+0x2a0/0x2a0
[ 6.811565][ T11] ? rwlock_bug.part.0+0x90/0x90
[ 6.811565][ T11] ? _raw_spin_lock_irq+0x45/0x50
[ 6.811565][ T11] worker_thread+0x669/0x1090
[ 6.811565][ T11] ? process_one_work+0x1710/0x1710
[ 6.811565][ T11] kthread+0x2e8/0x3a0
[ 6.811565][ T11] ? kthread_complete_and_exit+0x40/0x40
[ 6.811565][ T11] ret_from_fork+0x1f/0x30
[ 6.811565][ T11] </TASK>
[ 6.811565][ T11] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 6.811565][ T11] CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.0-rc8-next-20221207-syzkaller-dirty #0
[ 6.811565][ T11] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 6.811565][ T11] Workqueue: eval_map_wq tracer_init_tracefs_work_func
[ 6.811565][ T11] Call Trace:
[ 6.811565][ T11] <TASK>
[ 6.811565][ T11] dump_stack_lvl+0xd1/0x138
[ 6.811565][ T11] panic+0x2cc/0x626
[ 6.811565][ T11] ? panic_print_sys_info.part.0+0x110/0x110
[ 6.811565][ T11] ? rcu_note_context_switch+0x8fb/0x1840
[ 6.811565][ T11] check_panic_on_warn.cold+0x19/0x35
[ 6.811565][ T11] __warn+0xf2/0x1a0
[ 6.811565][ T11] ? rcu_note_context_switch+0x8fb/0x1840
[ 6.811565][ T11] report_bug+0x1c0/0x210
[ 6.811565][ T11] handle_bug+0x3c/0x70
[ 6.811565][ T11] exc_invalid_op+0x18/0x50
[ 6.811565][ T11] asm_exc_invalid_op+0x1a/0x20
[ 6.811565][ T11] RIP: 0010:rcu_note_context_switch+0x8fb/0x1840
[ 6.811565][ T11] Code: 83 e2 07 85 c9 0f 84 f8 02 00 00 38 d0 7f 08 84 c0 0f 85 ce 08 00 00 80 7b 11 00 0f 85 e0 06 00 00 45 85 ff 0f 84 9b f8 ff ff <0f> 0b e9 94 f8 ff ff 48 8d 7b 20 c6 43 11 00 48 b8 00 00 00 00 00
[ 6.811565][ T11] RSP: 0000:ffffc900001076d8 EFLAGS: 00010002
[ 6.811565][ T11] RAX: 0000000000000000 RBX: ffff8880b993c440 RCX: 0000000000000000
[ 6.811565][ T11] RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001
[ 6.811565][ T11] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8c79be43
[ 6.811565][ T11] R10: fffffbfff18f37c8 R11: ffffffff8c79bf00 R12: ffffffff8c79be40
[ 6.811565][ T11] R13: ffff8880b993c460 R14: ffff8880b993c451 R15: 0000000000000001
[ 6.811565][ T11] ? rcu_note_context_switch+0x8b5/0x1840
[ 6.811565][ T11] ? lockdep_hardirqs_off+0x94/0xd0
[ 6.811565][ T11] ? preempt_schedule_notrace+0x5f/0xe0
[ 6.811565][ T11] __schedule+0x24c/0x5450
[ 6.811565][ T11] ? lock_chain_count+0x20/0x20
[ 6.811565][ T11] ? lock_chain_count+0x20/0x20
[ 6.811565][ T11] ? io_schedule_timeout+0x150/0x150
[ 6.811565][ T11] ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 6.811565][ T11] ? lockdep_hardirqs_on+0x7d/0x100
[ 6.811565][ T11] ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 6.811565][ T11] ? preempt_schedule_notrace_thunk+0x1a/0x20
[ 6.811565][ T11] preempt_schedule_notrace+0x5f/0xe0
[ 6.811565][ T11] preempt_schedule_notrace_thunk+0x1a/0x20
[ 6.811565][ T11] lock_acquire+0x516/0x630
[ 6.811565][ T11] ? lock_release+0x810/0x810
[ 6.811565][ T11] ? find_held_lock+0x2d/0x110
[ 6.811565][ T11] ? lookup_dcache+0x1e/0x130
[ 6.811565][ T11] __d_lookup+0xa9/0x460
[ 6.811565][ T11] ? __d_lookup+0x67/0x460
[ 6.811565][ T11] d_lookup+0xdc/0x170
[ 6.811565][ T11] lookup_dcache+0x1e/0x130
[ 6.811565][ T11] lookup_one_len+0x154/0x1a0
[ 6.811565][ T11] ? try_lookup_one_len+0x190/0x190
[ 6.811565][ T11] ? down_write_killable+0x250/0x250
[ 6.811565][ T11] ? do_raw_spin_unlock+0x175/0x230
[ 6.811565][ T11] ? mntput+0x10/0x90
[ 6.811565][ T11] start_creating+0x112/0x270
[ 6.811565][ T11] tracefs_create_file+0x98/0x600
[ 6.811565][ T11] trace_create_file+0x33/0x50
[ 6.811565][ T11] event_create_dir+0xaea/0x1330
[ 6.811565][ T11] __trace_early_add_event_dirs+0x7e/0xf0
[ 6.811565][ T11] event_trace_init+0x87/0xfc
[ 6.811565][ T11] tracer_init_tracefs_work_func+0x12/0x2bb
[ 6.811565][ T11] process_one_work+0x9bf/0x1710
[ 6.811565][ T11] ? pwq_dec_nr_in_flight+0x2a0/0x2a0
[ 6.811565][ T11] ? rwlock_bug.part.0+0x90/0x90
[ 6.811565][ T11] ? _raw_spin_lock_irq+0x45/0x50
[ 6.811565][ T11] worker_thread+0x669/0x1090
[ 6.811565][ T11] ? process_one_work+0x1710/0x1710
[ 6.811565][ T11] kthread+0x2e8/0x3a0
[ 6.811565][ T11] ? kthread_complete_and_exit+0x40/0x40
[ 6.811565][ T11] ret_from_fork+0x1f/0x30
[ 6.811565][ T11] </TASK>
[ 6.811565][ T11] Kernel Offset: disabled
[ 6.811565][ T11] Rebooting in 86400 seconds..


syzkaller build log:
go env (err=<nil>)
GO111MODULE="auto"
GOARCH="amd64"
GOBIN=""
GOCACHE="/syzkaller/.cache/go-build"
GOENV="/syzkaller/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/syzkaller/jobs/linux/gopath/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/syzkaller/jobs/linux/gopath"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1203642167=/tmp/go-build -gno-record-gcc-switches"

git status (err=<nil>)
HEAD detached at d88f3abb0
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d88f3abb0873e90df9259d60d5bcd3ad796db6b8 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221206-135530'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d88f3abb0873e90df9259d60d5bcd3ad796db6b8 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221206-135530'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d88f3abb0873e90df9259d60d5bcd3ad796db6b8 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221206-135530'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d88f3abb0873e90df9259d60d5bcd3ad796db6b8\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=125dd843880000


Tested on:

commit: 591cd615 Add linux-next specific files for 20221207
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
kernel config: https://syzkaller.appspot.com/x/.config?x=8b2d3e63e054c24f

dashboard link: https://syzkaller.appspot.com/bug?extid=1eb4232fca28c0a6d1c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=16a3316d880000

[Hillf Danton]

On 07 Dec 2022 18:37:37 -0800

> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 591cd61541b9 Add linux-next specific files for 20221207
> git tree: linux-next

@@ -156,6 +156,8 @@ static void rcu_preempt_ctxt_queue(struc

(rnp->qsmask & rdp->grpmask ? RCU_GP_BLKD : 0) +
(rnp->expmask & rdp->grpmask ? RCU_EXP_BLKD : 0);
struct task_struct *t = current;
+ int w = 0;

+ static int __loop = 0;

raw_lockdep_assert_held_rcu_node(rnp);
WARN_ON_ONCE(rdp->mynode != rnp);

@@ -183,6 +185,7 @@ static void rcu_preempt_ctxt_queue(struc

* blocking the already-waiting GPs.
*/
list_add(&t->rcu_node_entry, &rnp->blkd_tasks);
+ w = 1;
break;

case RCU_EXP_BLKD:

@@ -201,6 +204,7 @@ static void rcu_preempt_ctxt_queue(struc

* already queued tasks that are not blocking it.
*/
list_add_tail(&t->rcu_node_entry, &rnp->blkd_tasks);
+ w = 1;
break;

case RCU_EXP_TASKS + RCU_EXP_BLKD:

@@ -262,6 +266,7 @@ static void rcu_preempt_ctxt_queue(struc
rcu_report_exp_rdp(rdp);
else
WARN_ON_ONCE(rdp->cpu_no_qs.b.exp);
+ WARN_ON_ONCE(w && __loop++ > 100);
}

/*
--

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

1] IPsec XFRM device driver
[ 10.391370][ T1] NET: Registered PF_INET6 protocol family
[ 10.401430][ T1] Segment Routing with IPv6
[ 10.402451][ T1] RPL Segment Routing with IPv6
[ 10.403552][ T1] In-situ OAM (IOAM) with IPv6
[ 10.404513][ T1] mip6: Mobile IPv6
[ 10.408666][ T1] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 10.414909][ T1] ip6_gre: GRE over IPv6 tunneling driver
[ 10.418561][ T1] NET: Registered PF_PACKET protocol family
[ 10.420016][ T1] NET: Registered PF_KEY protocol family
[ 10.421217][ T1] Bridge firewalling registered
[ 10.422716][ T1] NET: Registered PF_X25 protocol family
[ 10.423756][ T1] X25: Linux Version 0.2
[ 10.464058][ T1] NET: Registered PF_NETROM protocol family
[ 10.504639][ T1] NET: Registered PF_ROSE protocol family
[ 10.506106][ T1] NET: Registered PF_AX25 protocol family
[ 10.508103][ T1] can: controller area network core
[ 10.509722][ T1] NET: Registered PF_CAN protocol family
[ 10.510710][ T1] can: raw protocol
[ 10.511327][ T1] can: broadcast manager protocol
[ 10.512447][ T1] can: netlink gateway - max_hops=1
[ 10.513228][ T1] can: SAE J1939
[ 10.514598][ T1] can: isotp protocol
[ 10.515523][ T1] Bluetooth: RFCOMM TTY layer initialized
[ 10.517265][ T1] Bluetooth: RFCOMM socket layer initialized
[ 10.518316][ T1] Bluetooth: RFCOMM ver 1.11
[ 10.519103][ T1] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 10.520174][ T1] Bluetooth: BNEP filters: protocol multicast
[ 10.521428][ T1] Bluetooth: BNEP socket layer initialized
[ 10.522281][ T1] Bluetooth: CMTP (CAPI Emulation) ver 1.0
[ 10.523367][ T1] Bluetooth: CMTP socket layer initialized
[ 10.524213][ T1] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 10.525212][ T1] Bluetooth: HIDP socket layer initialized
[ 10.529275][ T1] NET: Registered PF_RXRPC protocol family
[ 10.530339][ T1] Key type rxrpc registered
[ 10.531082][ T1] Key type rxrpc_s registered
[ 10.532752][ T1] NET: Registered PF_KCM protocol family
[ 10.534825][ T1] lec:lane_module_init: lec.c: initialized
[ 10.537240][ T1] mpoa:atm_mpoa_init: mpc.c: initialized
[ 10.539560][ T1] l2tp_core: L2TP core driver, V2.0
[ 10.541140][ T1] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[ 10.542715][ T1] l2tp_ip: L2TP IP encapsulation support (L2TPv3)
[ 10.544849][ T1] l2tp_netlink: L2TP netlink interface
[ 10.546686][ T1] l2tp_eth: L2TP ethernet pseudowire support (L2TPv3)
[ 10.549082][ T1] l2tp_ip6: L2TP IP encapsulation support for IPv6 (L2TPv3)
[ 10.550677][ T1] NET: Registered PF_PHONET protocol family
[ 10.552447][ T1] 8021q: 802.1Q VLAN Support v1.8
[ 10.565308][ T1] DCCP: Activated CCID 2 (TCP-like)
[ 10.567991][ T1] DCCP: Activated CCID 3 (TCP-Friendly Rate Control)
[ 10.570250][ T1] sctp: Hash tables configured (bind 32/56)
[ 10.573190][ T1] NET: Registered PF_RDS protocol family
[ 10.574970][ T1] Registered RDS/infiniband transport
[ 10.577010][ T1] Registered RDS/tcp transport
[ 10.578040][ T1] tipc: Activated (version 2.0.0)
[ 10.580751][ T1] NET: Registered PF_TIPC protocol family
[ 10.582721][ T1] tipc: Started in single node mode
[ 10.584345][ T1] NET: Registered PF_SMC protocol family
[ 10.585878][ T1] 9pnet: Installing 9P2000 support
[ 10.588031][ T1] NET: Registered PF_CAIF protocol family
[ 10.594274][ T1] NET: Registered PF_IEEE802154 protocol family
[ 10.596365][ T1] Key type dns_resolver registered
[ 10.598569][ T1] Key type ceph registered
[ 10.600505][ T1] libceph: loaded (mon/osd proto 15/24)
[ 10.603175][ T1] batman_adv: B.A.T.M.A.N. advanced 2022.3 (compatibility version 15) loaded
[ 10.606338][ T1] openvswitch: Open vSwitch switching datapath
[ 10.610563][ T1] NET: Registered PF_VSOCK protocol family
[ 10.612883][ T1] mpls_gso: MPLS GSO support
[ 10.632582][ T1] IPI shorthand broadcast: enabled
[ 10.634432][ T1] AVX2 version of gcm_enc/dec engaged.
[ 10.636283][ T1] AES CTR mode by8 optimization enabled
[ 11.036331][ T3320] ------------[ cut here ]------------
[ 11.036432][ T3320] WARNING: CPU: 1 PID: 3320 at kernel/rcu/tree_plugin.h:269 rcu_note_context_switch+0x913/0x1870
[ 11.036432][ T3320] Modules linked in:
[ 11.036432][ T3320] CPU: 1 PID: 3320 Comm: kworker/u4:0 Not tainted 6.1.0-rc8-next-20221207-syzkaller-dirty #0
[ 11.036432][ T3320] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 11.036432][ T3320] RIP: 0010:rcu_note_context_switch+0x913/0x1870
[ 11.036432][ T3320] Code: 7b 11 00 0f 85 f8 06 00 00 45 85 ff 0f 84 9b f8 ff ff 8b 05 ef 39 53 10 8d 50 01 83 f8 64 89 15 e3 39 53 10 0f 8e 83 f8 ff ff <0f> 0b e9 7c f8 ff ff 48 8d 7b 20 c6 43 11 00 48 b8 00 00 00 00 00
[ 11.036432][ T3320] RSP: 0000:ffffc9000e2bf3d0 EFLAGS: 00010002
[ 11.057837][ T3320] RAX: 0000000000000065 RBX: ffff8880b993c440 RCX: 0000000000000000
[ 11.059836][ T3320] RDX: 0000000000000066 RSI: 0000000000000004 RDI: 0000000000000001
[ 11.062326][ T3320] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8c79be43
[ 11.064438][ T3320] R10: fffffbfff18f37c8 R11: ffffffff8c79bf00 R12: ffffffff8c79be40
[ 11.066489][ T3320] R13: ffff8880b993c460 R14: ffff8880b993c451 R15: 0000000000000001
[ 11.068944][ T3320] FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
[ 11.071125][ T3320] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 11.073264][ T3320] CR2: 0000000000000000 CR3: 000000000c48e000 CR4: 00000000003506e0
[ 11.073264][ T3320] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 11.078150][ T3320] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 11.080625][ T3320] Call Trace:
[ 11.082027][ T3320] <TASK>
[ 11.083007][ T3320] ? lockdep_hardirqs_off+0x94/0xd0
[ 11.083007][ T3320] ? preempt_schedule_notrace+0x5f/0xe0
[ 11.083007][ T3320] __schedule+0x24c/0x5450
[ 11.083007][ T3320] ? asm_sysvec_reschedule_ipi+0x1a/0x20
[ 11.083007][ T3320] ? pvclock_clocksource_read+0xd4/0x530
[ 11.083007][ T3320] ? io_schedule_timeout+0x150/0x150
[ 11.083007][ T3320] ? preempt_schedule_notrace_thunk+0x1a/0x20
[ 11.083007][ T3320] preempt_schedule_notrace+0x5f/0xe0
[ 11.083007][ T3320] preempt_schedule_notrace_thunk+0x1a/0x20
[ 11.083007][ T3320] ? sched_clock_local+0x139/0x1d0
[ 11.083007][ T3320] sched_clock_cpu+0x20d/0x2b0
[ 11.083007][ T3320] ? save_stack+0xbb/0x1e0
[ 11.083007][ T3320] ? prepare_to_wait+0x380/0x380
[ 11.083007][ T3320] ? __alloc_pages+0x1cb/0x5b0
[ 11.083007][ T3320] ? alloc_pages+0x1aa/0x270
[ 11.083007][ T3320] ? allocate_slab+0x25f/0x350
[ 11.083007][ T3320] ? ___slab_alloc+0xa91/0x1400
[ 11.083007][ T3320] ? __slab_alloc.constprop.0+0x56/0xa0
[ 11.083007][ T3320] ? kmem_cache_alloc+0x379/0x430
[ 11.083007][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.083007][ T3320] ? mas_preallocate+0x1bb/0x360
[ 11.083007][ T3320] __set_page_owner_handle+0x2ab/0x3b0
[ 11.083007][ T3320] __set_page_owner+0x48/0x60
[ 11.083007][ T3320] get_page_from_freelist+0x119c/0x2ce0
[ 11.083007][ T3320] ? __lock_acquire+0x166e/0x56d0
[ 11.083007][ T3320] ? __zone_watermark_ok+0x460/0x460
[ 11.083007][ T3320] ? prepare_alloc_pages+0x178/0x570
[ 11.083007][ T3320] __alloc_pages+0x1cb/0x5b0
[ 11.083007][ T3320] ? __alloc_pages_slowpath.constprop.0+0x23d0/0x23d0
[ 11.083007][ T3320] alloc_pages+0x1aa/0x270
[ 11.083007][ T3320] allocate_slab+0x25f/0x350
[ 11.083007][ T3320] ___slab_alloc+0xa91/0x1400
[ 11.083007][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.083007][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.083007][ T3320] __slab_alloc.constprop.0+0x56/0xa0
[ 11.083007][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.083007][ T3320] kmem_cache_alloc+0x379/0x430
[ 11.083007][ T3320] mas_alloc_nodes+0x429/0x810
[ 11.083007][ T3320] mas_preallocate+0x1bb/0x360
[ 11.083007][ T3320] vma_link+0xa6/0x290
[ 11.083007][ T3320] ? vma_mas_store+0x3f0/0x3f0
[ 11.083007][ T3320] insert_vm_struct+0x1e5/0x400
[ 11.083007][ T3320] ? exit_mmap+0x7b0/0x7b0
[ 11.083007][ T3320] ? kmem_cache_alloc+0x234/0x430
[ 11.083007][ T3320] alloc_bprm+0x4e1/0x900
[ 11.146529][ T3320] kernel_execve+0xaf/0x500
[ 11.148464][ T3320] call_usermodehelper_exec_async+0x2e7/0x580
[ 11.149019][ T3320] ? umh_complete+0x90/0x90
[ 11.149019][ T3320] ret_from_fork+0x1f/0x30
[ 11.149019][ T3320] </TASK>
[ 11.149019][ T3320] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 11.149019][ T3320] CPU: 1 PID: 3320 Comm: kworker/u4:0 Not tainted 6.1.0-rc8-next-20221207-syzkaller-dirty #0
[ 11.149019][ T3320] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 11.149019][ T3320] Call Trace:
[ 11.149019][ T3320] <TASK>
[ 11.149019][ T3320] dump_stack_lvl+0xd1/0x138
[ 11.149019][ T3320] panic+0x2cc/0x626
[ 11.149019][ T3320] ? panic_print_sys_info.part.0+0x110/0x110
[ 11.149019][ T3320] ? rcu_note_context_switch+0x913/0x1870
[ 11.149019][ T3320] check_panic_on_warn.cold+0x19/0x35
[ 11.149019][ T3320] __warn+0xf2/0x1a0
[ 11.149019][ T3320] ? rcu_note_context_switch+0x913/0x1870
[ 11.149019][ T3320] report_bug+0x1c0/0x210
[ 11.149019][ T3320] handle_bug+0x3c/0x70
[ 11.149019][ T3320] exc_invalid_op+0x18/0x50
[ 11.149019][ T3320] asm_exc_invalid_op+0x1a/0x20
[ 11.176555][ T3320] RIP: 0010:rcu_note_context_switch+0x913/0x1870
[ 11.176561][ T3320] Code: 7b 11 00 0f 85 f8 06 00 00 45 85 ff 0f 84 9b f8 ff ff 8b 05 ef 39 53 10 8d 50 01 83 f8 64 89 15 e3 39 53 10 0f 8e 83 f8 ff ff <0f> 0b e9 7c f8 ff ff 48 8d 7b 20 c6 43 11 00 48 b8 00 00 00 00 00
[ 11.184084][ T3320] RSP: 0000:ffffc9000e2bf3d0 EFLAGS: 00010002
[ 11.186302][ T3320] RAX: 0000000000000065 RBX: ffff8880b993c440 RCX: 0000000000000000
[ 11.188128][ T3320] RDX: 0000000000000066 RSI: 0000000000000004 RDI: 0000000000000001
[ 11.189513][ T3320] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8c79be43
[ 11.189513][ T3320] R10: fffffbfff18f37c8 R11: ffffffff8c79bf00 R12: ffffffff8c79be40
[ 11.189513][ T3320] R13: ffff8880b993c460 R14: ffff8880b993c451 R15: 0000000000000001
[ 11.189513][ T3320] ? lockdep_hardirqs_off+0x94/0xd0
[ 11.189513][ T3320] ? preempt_schedule_notrace+0x5f/0xe0
[ 11.189513][ T3320] __schedule+0x24c/0x5450
[ 11.189513][ T3320] ? asm_sysvec_reschedule_ipi+0x1a/0x20
[ 11.189513][ T3320] ? pvclock_clocksource_read+0xd4/0x530
[ 11.189513][ T3320] ? io_schedule_timeout+0x150/0x150
[ 11.189513][ T3320] ? preempt_schedule_notrace_thunk+0x1a/0x20
[ 11.206531][ T3320] preempt_schedule_notrace+0x5f/0xe0
[ 11.206531][ T3320] preempt_schedule_notrace_thunk+0x1a/0x20
[ 11.206531][ T3320] ? sched_clock_local+0x139/0x1d0
[ 11.206531][ T3320] sched_clock_cpu+0x20d/0x2b0
[ 11.206531][ T3320] ? save_stack+0xbb/0x1e0
[ 11.206531][ T3320] ? prepare_to_wait+0x380/0x380
[ 11.206531][ T3320] ? __alloc_pages+0x1cb/0x5b0
[ 11.206531][ T3320] ? alloc_pages+0x1aa/0x270
[ 11.206531][ T3320] ? allocate_slab+0x25f/0x350
[ 11.206531][ T3320] ? ___slab_alloc+0xa91/0x1400
[ 11.206531][ T3320] ? __slab_alloc.constprop.0+0x56/0xa0
[ 11.206531][ T3320] ? kmem_cache_alloc+0x379/0x430
[ 11.206531][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.206531][ T3320] ? mas_preallocate+0x1bb/0x360
[ 11.206531][ T3320] __set_page_owner_handle+0x2ab/0x3b0
[ 11.206531][ T3320] __set_page_owner+0x48/0x60
[ 11.206531][ T3320] get_page_from_freelist+0x119c/0x2ce0
[ 11.206531][ T3320] ? __lock_acquire+0x166e/0x56d0
[ 11.206531][ T3320] ? __zone_watermark_ok+0x460/0x460
[ 11.206531][ T3320] ? prepare_alloc_pages+0x178/0x570
[ 11.234792][ T3320] __alloc_pages+0x1cb/0x5b0
[ 11.236054][ T3320] ? __alloc_pages_slowpath.constprop.0+0x23d0/0x23d0
[ 11.236054][ T3320] alloc_pages+0x1aa/0x270
[ 11.236054][ T3320] allocate_slab+0x25f/0x350
[ 11.236054][ T3320] ___slab_alloc+0xa91/0x1400
[ 11.236054][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.236054][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.236054][ T3320] __slab_alloc.constprop.0+0x56/0xa0
[ 11.236054][ T3320] ? mas_alloc_nodes+0x429/0x810
[ 11.236054][ T3320] kmem_cache_alloc+0x379/0x430
[ 11.236054][ T3320] mas_alloc_nodes+0x429/0x810
[ 11.236054][ T3320] mas_preallocate+0x1bb/0x360
[ 11.236054][ T3320] vma_link+0xa6/0x290
[ 11.236054][ T3320] ? vma_mas_store+0x3f0/0x3f0
[ 11.236054][ T3320] insert_vm_struct+0x1e5/0x400
[ 11.236054][ T3320] ? exit_mmap+0x7b0/0x7b0
[ 11.236054][ T3320] ? kmem_cache_alloc+0x234/0x430
[ 11.236054][ T3320] alloc_bprm+0x4e1/0x900
[ 11.236054][ T3320] kernel_execve+0xaf/0x500
[ 11.236054][ T3320] call_usermodehelper_exec_async+0x2e7/0x580
[ 11.236054][ T3320] ? umh_complete+0x90/0x90
[ 11.236054][ T3320] ret_from_fork+0x1f/0x30
[ 11.236054][ T3320] </TASK>
[ 11.236054][ T3320] Kernel Offset: disabled
[ 11.236054][ T3320] Rebooting in 86400 seconds..

GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1709421499=/tmp/go-build -gno-record-gcc-switches"

git status (err=<nil>)
HEAD detached at d88f3abb0
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d88f3abb0873e90df9259d60d5bcd3ad796db6b8 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221206-135530'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d88f3abb0873e90df9259d60d5bcd3ad796db6b8 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221206-135530'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d88f3abb0873e90df9259d60d5bcd3ad796db6b8 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221206-135530'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d88f3abb0873e90df9259d60d5bcd3ad796db6b8\"


Error text is too large and was truncated, full error text is at:

https://syzkaller.appspot.com/x/error.txt?x=1263316d880000

Tested on:

commit: 591cd615 Add linux-next specific files for 20221207
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
kernel config: https://syzkaller.appspot.com/x/.config?x=8b2d3e63e054c24f
dashboard link: https://syzkaller.appspot.com/bug?extid=1eb4232fca28c0a6d1c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=11621467880000

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 591cd61541b9 Add linux-next specific files for 20221207
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1391f17d880000
kernel config: https://syzkaller.appspot.com/x/.config?x=8b2d3e63e054c24f

dashboard link: https://syzkaller.appspot.com/bug?extid=1eb4232fca28c0a6d1c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13b597bd880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1008851d880000

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/bc862c01ec56/disk-591cd615.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8f9b93f8ed2f/vmlinux-591cd615.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9d5cb636d548/bzImage-591cd615.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1eb423...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline]
BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline]
BUG: KASAN: use-after-free in rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434

Read of size 4 at addr ffff888078ad0014 by task kworker/u4:2/31

CPU: 0 PID: 31 Comm: kworker/u4:2 Not tainted 6.1.0-rc8-next-20221207-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: netns cleanup_net
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106

print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:417
kasan_report+0xbf/0x1f0 mm/kasan/report.c:517

check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x141/0x190 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:72 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
refcount_read include/linux/refcount.h:147 [inline]
rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434
rxrpc_exit_net+0x174/0x300 net/rxrpc/net_ns.c:128
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376

ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>

Allocated by task 5248:

kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380

kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]

rxrpc_alloc_local net/rxrpc/local_object.c:93 [inline]
rxrpc_lookup_local+0x4d9/0xfb0 net/rxrpc/local_object.c:249
rxrpc_bind+0x35e/0x5c0 net/rxrpc/af_rxrpc.c:150
afs_open_socket+0x1b4/0x360 fs/afs/rxrpc.c:64
afs_net_init+0xa79/0xed0 fs/afs/main.c:126
ops_init+0xb9/0x680 net/core/net_namespace.c:135
setup_net+0x793/0xe60 net/core/net_namespace.c:333
copy_net_ns+0x31b/0x6b0 net/core/net_namespace.c:483
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110

copy_namespaces+0x3b3/0x4a0 kernel/nsproxy.c:179
copy_process+0x30d3/0x75c0 kernel/fork.c:2269
kernel_clone+0xeb/0xa40 kernel/fork.c:2681
__do_sys_clone3+0x1d1/0x370 kernel/fork.c:2980

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 5069:

kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52

kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518

____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]

slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
__kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800
rcu_do_batch kernel/rcu/tree.c:2244 [inline]
rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2504

__do_softirq+0x1fb/0xadc kernel/softirq.c:571

Last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45

__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
__call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753

rxrpc_put_local.part.0+0x128/0x170 net/rxrpc/local_object.c:332
rxrpc_put_local+0x25/0x30 net/rxrpc/local_object.c:324
rxrpc_release_sock net/rxrpc/af_rxrpc.c:888 [inline]
rxrpc_release+0x237/0x550 net/rxrpc/af_rxrpc.c:914
__sock_release net/socket.c:650 [inline]
sock_release+0x8b/0x1b0 net/socket.c:678
afs_close_socket+0x1ce/0x330 fs/afs/rxrpc.c:125
afs_net_exit+0x179/0x320 fs/afs/main.c:158
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376

ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff888078ad0000

which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 20 bytes inside of

1024-byte region [ffff888078ad0000, ffff888078ad0400)

The buggy address belongs to the physical page:

page:ffffea0001e2b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78ad0
head:ffffea0001e2b400 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0

flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)

raw: 00fff00000010200 ffff888012441dc0 dead000000000122 0000000000000000

raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated

page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5248, tgid 5245 (syz-executor423), ts 105105032247, free_ts 45157750006

prep_new_page mm/page_alloc.c:2531 [inline]
get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549

alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285

alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
__slab_alloc_node mm/slub.c:3345 [inline]
slab_alloc_node mm/slub.c:3442 [inline]
__kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491

kmalloc_trace+0x26/0x60 mm/slab_common.c:1062
kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]

rxrpc_alloc_local net/rxrpc/local_object.c:93 [inline]
rxrpc_lookup_local+0x4d9/0xfb0 net/rxrpc/local_object.c:249
rxrpc_bind+0x35e/0x5c0 net/rxrpc/af_rxrpc.c:150
afs_open_socket+0x1b4/0x360 fs/afs/rxrpc.c:64
afs_net_init+0xa79/0xed0 fs/afs/main.c:126
ops_init+0xb9/0x680 net/core/net_namespace.c:135
setup_net+0x793/0xe60 net/core/net_namespace.c:333
copy_net_ns+0x31b/0x6b0 net/core/net_namespace.c:483
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110

page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]

free_pages_prepare mm/page_alloc.c:1446 [inline]
free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496
free_unref_page_prepare mm/page_alloc.c:3369 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3464
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:761 [inline]
slab_alloc_node mm/slub.c:3452 [inline]

slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc+0x1e4/0x430 mm/slub.c:3476
getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
getname_flags+0x9e/0xe0 include/linux/audit.h:320
vfs_fstatat+0x77/0xb0 fs/stat.c:275
__do_sys_newfstatat+0x8a/0x110 fs/stat.c:446

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:

ffff888078acff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888078acff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888078ad0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888078ad0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888078ad0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.