[syzbot] [rds?] KASAN: slab-use-after-free Read in rds_conn_path_drop

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ecc64d2dc9ff Merge tag 'sysctl-7.00-fixes-rc3' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14eb98d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=163cf0fb07ea84d3
dashboard link: https://syzkaller.appspot.com/bug?extid=da8e060735ae02c8f3d1
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ecc64d2d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f7dbb1345713/vmlinux-ecc64d2d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ff1cd3190933/bzImage-ecc64d2d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+da8e06...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: slab-use-after-free in refcount_read include/linux/refcount.h:170 [inline]
BUG: KASAN: slab-use-after-free in __ns_ref_read include/linux/ns_common.h:65 [inline]
BUG: KASAN: slab-use-after-free in check_net include/net/net_namespace.h:309 [inline]
BUG: KASAN: slab-use-after-free in rds_destroy_pending net/rds/rds.h:984 [inline]
BUG: KASAN: slab-use-after-free in rds_conn_path_drop+0x11d/0x3c0 net/rds/connection.c:914
Read of size 4 at addr ffff88804ae88180 by task kworker/u32:0/23206

CPU: 2 UID: 0 PID: 23206 Comm: kworker/u32:0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: ib_mad1 timeout_sends
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x156/0x4c9 mm/kasan/report.c:482
kasan_report+0xdf/0x1e0 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:186 [inline]
kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
instrument_atomic_read include/linux/instrumented.h:82 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
refcount_read include/linux/refcount.h:170 [inline]
__ns_ref_read include/linux/ns_common.h:65 [inline]
check_net include/net/net_namespace.h:309 [inline]
rds_destroy_pending net/rds/rds.h:984 [inline]
rds_conn_path_drop+0x11d/0x3c0 net/rds/connection.c:914
rds_rdma_cm_event_handler_cmn+0x47d/0x7c0 net/rds/rdma_transport.c:146
cma_cm_event_handler+0x99/0x330 drivers/infiniband/core/cma.c:2181
cma_ib_handler+0x29d/0x700 drivers/infiniband/core/cma.c:2259
cm_process_send_error drivers/infiniband/core/cm.c:3801 [inline]
cm_send_handler+0x533/0x9d0 drivers/infiniband/core/cm.c:3834
clear_mad_error_list+0x18f/0x260 drivers/infiniband/core/mad.c:2646
timeout_sends+0x720/0xb20 drivers/infiniband/core/mad.c:2918
process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
process_scheduled_works kernel/workqueue.c:3358 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
kthread+0x370/0x450 kernel/kthread.c:467
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

Allocated by task 26019:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4515 [inline]
slab_alloc_node mm/slub.c:4844 [inline]
kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4851
net_alloc net/core/net_namespace.c:490 [inline]
copy_net_ns+0xe8/0x7c0 net/core/net_namespace.c:565
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:130
unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x473/0xad0 kernel/fork.c:3174
__do_sys_unshare kernel/fork.c:3245 [inline]
__se_sys_unshare kernel/fork.c:3243 [inline]
__ia32_sys_unshare+0x30/0x40 kernel/fork.c:3243
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe3/0x8c0 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Freed by task 14441:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2692 [inline]
slab_free mm/slub.c:6143 [inline]
kmem_cache_free+0x124/0x6a0 mm/slub.c:6273
net_complete_free net/core/net_namespace.c:526 [inline]
cleanup_net+0x51a/0x920 net/core/net_namespace.c:713
process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
process_scheduled_works kernel/workqueue.c:3358 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
kthread+0x370/0x450 kernel/kthread.c:467
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
insert_work+0x36/0x230 kernel/workqueue.c:2199
__queue_work+0x3fd/0x1150 kernel/workqueue.c:2358
call_timer_fn+0x19a/0x670 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1794 [inline]
__run_timers+0x570/0xb30 kernel/time/timer.c:2373
__run_timer_base kernel/time/timer.c:2385 [inline]
__run_timer_base kernel/time/timer.c:2377 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2394
run_timer_softirq+0x24/0x50 kernel/time/timer.c:2405
handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697

Second to last potentially related work creation:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
insert_work+0x36/0x230 kernel/workqueue.c:2199
__queue_work+0x9bc/0x1150 kernel/workqueue.c:2354
call_timer_fn+0x19a/0x670 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1794 [inline]
__run_timers+0x570/0xb30 kernel/time/timer.c:2373
__run_timer_base kernel/time/timer.c:2385 [inline]
__run_timer_base kernel/time/timer.c:2377 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2394
run_timer_softirq+0x24/0x50 kernel/time/timer.c:2405
handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697

The buggy address belongs to the object at ffff88804ae88000
which belongs to the cache net_namespace of size 9536
The buggy address is located 384 bytes inside of
freed 9536-byte region [ffff88804ae88000, ffff88804ae8a540)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88804ae88000 pfn:0x4ae88
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88804dfbda81
flags: 0x4fff00000000240(workingset|head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000240 ffff88801d2f2780 ffffea0001663410 ffffea0001c9fe10
raw: ffff88804ae88000 0000000800030001 00000000f5000000 ffff88804dfbda81
head: 04fff00000000240 ffff88801d2f2780 ffffea0001663410 ffffea0001c9fe10
head: ffff88804ae88000 0000000800030001 00000000f5000000 ffff88804dfbda81
head: 04fff00000000003 ffffea00012ba201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
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 5930, tgid 5930 (syz-executor), ts 52026837212, free_ts 30286540261
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x153/0x170 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x27c/0x2ba0 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3269 [inline]
allocate_slab mm/slub.c:3458 [inline]
new_slab+0xa6/0x6d0 mm/slub.c:3516
refill_objects+0x26b/0x400 mm/slub.c:7153
refill_sheaf mm/slub.c:2818 [inline]
alloc_full_sheaf mm/slub.c:2839 [inline]
__pcs_replace_empty_main+0x19f/0x600 mm/slub.c:4602
alloc_from_pcs mm/slub.c:4695 [inline]
slab_alloc_node mm/slub.c:4829 [inline]
kmem_cache_alloc_noprof+0x480/0x6e0 mm/slub.c:4851
net_alloc net/core/net_namespace.c:490 [inline]
copy_net_ns+0xe8/0x7c0 net/core/net_namespace.c:565
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:130
unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x473/0xad0 kernel/fork.c:3174
__do_sys_unshare kernel/fork.c:3245 [inline]
__se_sys_unshare kernel/fork.c:3243 [inline]
__ia32_sys_unshare+0x30/0x40 kernel/fork.c:3243
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe3/0x8c0 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
page last free pid 5644 tgid 5644 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0x7e1/0x10d0 mm/page_alloc.c:2978
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xe0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4515 [inline]
slab_alloc_node mm/slub.c:4844 [inline]
kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4851
alloc_filename fs/namei.c:142 [inline]
do_getname+0x35/0x390 fs/namei.c:182
getname include/linux/fs.h:2512 [inline]
getname_maybe_null include/linux/fs.h:2519 [inline]
class_filename_maybe_null_constructor include/linux/fs.h:2543 [inline]
vfs_fstatat+0xd0/0xe0 fs/stat.c:368
__do_sys_newfstatat+0x9d/0x120 fs/stat.c:538
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
ffff88804ae88080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804ae88100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804ae88180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804ae88200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804ae88280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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