[v5.15] KASAN: use-after-free Read in try_to_wake_up
7 views
Skip to first unread message
syzbot
Jun 21, 2023, 7:56:01 PM6/21/23
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: f67653019430 Linux 5.15.118
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1746a21f280000
kernel config: https://syzkaller.appspot.com/x/.config?x=717fa62bb7f0fe9
dashboard link: https://syzkaller.appspot.com/bug?extid=c7d9b2e7d8efb0044656
compiler: Debian clang version 15.0.7, 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/d21188fbe046/disk-f6765301.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f0c688e23e63/vmlinux-f6765301.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eca85b3bf72c/bzImage-f6765301.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c7d9b2...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
Read of size 8 at addr ffff888077a18a28 by task kworker/u4:21/7368
CPU: 0 PID: 7368 Comm: kworker/u4:21 Not tainted 5.15.118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: btrfs-delalloc btrfs_work_helper
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
__lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4026
async_cow_free+0x4d/0x350 fs/btrfs/inode.c:1384
run_ordered_work fs/btrfs/async-thread.c:298 [inline]
btrfs_work_helper+0x8ed/0xba0 fs/btrfs/async-thread.c:335
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307
worker_thread+0xaca/0x1280 kernel/workqueue.c:2454
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>
Allocated by task 2:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
kernel_clone+0x210/0x960 kernel/fork.c:2601
kernel_thread+0x168/0x1e0 kernel/fork.c:2653
create_kthread kernel/kthread.c:342 [inline]
kthreadd+0x57d/0x740 kernel/kthread.c:686
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Freed by task 3556:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
rcu_do_batch kernel/rcu/tree.c:2510 [inline]
rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
Last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2994 [inline]
call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12cc/0x4590 kernel/sched/core.c:6372
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6776
irqentry_exit+0x53/0x80 kernel/entry/common.c:426
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643
Second to last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2994 [inline]
call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12cc/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
schedule_timeout+0xac/0x300 kernel/time/timer.c:1860
unix_wait_for_peer+0x24b/0x330 net/unix/af_unix.c:1315
unix_dgram_sendmsg+0x1441/0x2090 net/unix/af_unix.c:1913
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412
___sys_sendmsg+0x252/0x2e0 net/socket.c:2466
__sys_sendmmsg+0x2bf/0x560 net/socket.c:2552
__do_sys_sendmmsg net/socket.c:2581 [inline]
__se_sys_sendmmsg net/socket.c:2578 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2578
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff888077a18000
which belongs to the cache task_struct of size 7360
The buggy address is located 2600 bytes inside of
7360-byte region [ffff888077a18000, ffff888077a19cc0)
The buggy address belongs to the page:
page:ffffea0001de8600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77a18
head:ffffea0001de8600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801e14d581
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000200000001 ffff888140006280
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88801e14d581
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 548, ts 398647068275, free_ts 396339849129
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
kernel_clone+0x210/0x960 kernel/fork.c:2601
kernel_thread+0x168/0x1e0 kernel/fork.c:2653
call_usermodehelper_exec_sync kernel/umh.c:135 [inline]
call_usermodehelper_exec_work+0x93/0x220 kernel/umh.c:166
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307
worker_thread+0xaca/0x1280 kernel/workqueue.c:2454
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
__alloc_skb+0xdd/0x590 net/core/skbuff.c:415
alloc_skb_fclone include/linux/skbuff.h:1217 [inline]
sk_stream_alloc_skb+0x1fc/0xad0 net/ipv4/tcp.c:887
tcp_sendmsg_locked+0xe0c/0x3ab0 net/ipv4/tcp.c:1310
tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1462
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
sock_write_iter+0x39b/0x530 net/socket.c:1060
call_write_iter include/linux/fs.h:2103 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0xacf/0xe50 fs/read_write.c:594
Memory state around the buggy address:
ffff888077a18900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888077a18980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888077a18a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888077a18a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888077a18b00: 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.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: f67653019430 Linux 5.15.118
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1746a21f280000
kernel config: https://syzkaller.appspot.com/x/.config?x=717fa62bb7f0fe9
dashboard link: https://syzkaller.appspot.com/bug?extid=c7d9b2e7d8efb0044656
compiler: Debian clang version 15.0.7, 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/d21188fbe046/disk-f6765301.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f0c688e23e63/vmlinux-f6765301.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eca85b3bf72c/bzImage-f6765301.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c7d9b2...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
Read of size 8 at addr ffff888077a18a28 by task kworker/u4:21/7368
CPU: 0 PID: 7368 Comm: kworker/u4:21 Not tainted 5.15.118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: btrfs-delalloc btrfs_work_helper
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
__lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4026
async_cow_free+0x4d/0x350 fs/btrfs/inode.c:1384
run_ordered_work fs/btrfs/async-thread.c:298 [inline]
btrfs_work_helper+0x8ed/0xba0 fs/btrfs/async-thread.c:335
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307
worker_thread+0xaca/0x1280 kernel/workqueue.c:2454
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>
Allocated by task 2:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
kernel_clone+0x210/0x960 kernel/fork.c:2601
kernel_thread+0x168/0x1e0 kernel/fork.c:2653
create_kthread kernel/kthread.c:342 [inline]
kthreadd+0x57d/0x740 kernel/kthread.c:686
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Freed by task 3556:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
rcu_do_batch kernel/rcu/tree.c:2510 [inline]
rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
Last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2994 [inline]
call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12cc/0x4590 kernel/sched/core.c:6372
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6776
irqentry_exit+0x53/0x80 kernel/entry/common.c:426
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643
Second to last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2994 [inline]
call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12cc/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
schedule_timeout+0xac/0x300 kernel/time/timer.c:1860
unix_wait_for_peer+0x24b/0x330 net/unix/af_unix.c:1315
unix_dgram_sendmsg+0x1441/0x2090 net/unix/af_unix.c:1913
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412
___sys_sendmsg+0x252/0x2e0 net/socket.c:2466
__sys_sendmmsg+0x2bf/0x560 net/socket.c:2552
__do_sys_sendmmsg net/socket.c:2581 [inline]
__se_sys_sendmmsg net/socket.c:2578 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2578
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff888077a18000
which belongs to the cache task_struct of size 7360
The buggy address is located 2600 bytes inside of
7360-byte region [ffff888077a18000, ffff888077a19cc0)
The buggy address belongs to the page:
page:ffffea0001de8600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77a18
head:ffffea0001de8600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801e14d581
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000200000001 ffff888140006280
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88801e14d581
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 548, ts 398647068275, free_ts 396339849129
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
kernel_clone+0x210/0x960 kernel/fork.c:2601
kernel_thread+0x168/0x1e0 kernel/fork.c:2653
call_usermodehelper_exec_sync kernel/umh.c:135 [inline]
call_usermodehelper_exec_work+0x93/0x220 kernel/umh.c:166
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307
worker_thread+0xaca/0x1280 kernel/workqueue.c:2454
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
__alloc_skb+0xdd/0x590 net/core/skbuff.c:415
alloc_skb_fclone include/linux/skbuff.h:1217 [inline]
sk_stream_alloc_skb+0x1fc/0xad0 net/ipv4/tcp.c:887
tcp_sendmsg_locked+0xe0c/0x3ab0 net/ipv4/tcp.c:1310
tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1462
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
sock_write_iter+0x39b/0x530 net/socket.c:1060
call_write_iter include/linux/fs.h:2103 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0xacf/0xe50 fs/read_write.c:594
Memory state around the buggy address:
ffff888077a18900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888077a18980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888077a18a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888077a18a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888077a18b00: 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.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Sep 20, 2023, 7:41:54 PM9/20/23
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 35ecaa3632bf Linux 5.15.132
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1445005c680000
kernel config: https://syzkaller.appspot.com/x/.config?x=7e1620fbf0341078
dashboard link: https://syzkaller.appspot.com/bug?extid=c7d9b2e7d8efb0044656
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d3159c680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=157932a6680000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5544d1729cb8/disk-35ecaa36.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4e61190c49c1/vmlinux-35ecaa36.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e483f6e81777/bzImage-35ecaa36.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/d8a049097806/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c7d9b2...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
Read of size 8 at addr ffff88807e7727e8 by task udevd/3547
CPU: 1 PID: 3547 Comm: udevd Not tainted 5.15.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
<IRQ>
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1737
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:tomoyo_check_acl+0x2f8/0x410 security/tomoyo/domain.c:184
Code: 48 89 df 48 c1 ef 03 83 e7 18 48 8b 6c 24 20 48 01 ef be 08 00 00 00 e8 46 1c 06 fe 31 f6 48 0f a3 5d 00 0f 93 c3 40 0f 92 c6 <bf> 02 00 00 00 e8 3e 78 bc fd 84 db 74 19 41 0f b7 c7 3d 00 01 00
RSP: 0018:ffffc90002d9f938 EFLAGS: 00000246
RAX: ffffffff83c3a701 RBX: 0000000000000001 RCX: ffffffff83c3a76a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888023b81ab8
RBP: ffff888023b81ab0 R08: dffffc0000000000 R09: ffffed1004770358
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000fe0
R13: dffffc0000000000 R14: ffffc90002d9fa68 R15: 0000000000000071
tomoyo_path_permission+0x1af/0x360 security/tomoyo/file.c:586
tomoyo_path_perm+0x436/0x6b0 security/tomoyo/file.c:838
security_inode_getattr+0xcf/0x120 security/security.c:1348
vfs_getattr+0x26/0x360 fs/stat.c:157
vfs_statx+0x18f/0x3b0 fs/stat.c:225
vfs_fstatat fs/stat.c:243 [inline]
__do_sys_newfstatat fs/stat.c:411 [inline]
__se_sys_newfstatat fs/stat.c:405 [inline]
__x64_sys_newfstatat+0x12c/0x1b0 fs/stat.c:405
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffdbe3888a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00007f5cf0d705f4
RDX: 00007ffdbe3888b8 RSI: 00007ffdbe388987 RDI: 00000000ffffff9c
RBP: 00007ffdbe3899c0 R08: 0000000000000000 R09: 00007ffdbe389348
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdbe3899d8
R13: 0000000000000000 R14: 0000000000000008 R15: 0000557973646910
kernel_thread+0x168/0x1e0 kernel/fork.c:2648
nilfs_segctor_kill_thread fs/nilfs2/segment.c:2679 [inline]
nilfs_segctor_destroy fs/nilfs2/segment.c:2761 [inline]
nilfs_detach_log_writer+0x2e6/0xbd0 fs/nilfs2/segment.c:2850
nilfs_put_super+0x49/0x150 fs/nilfs2/super.c:498
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1414
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff88807e771dc0
head:ffffea0001f9dc00 order:3 compound_mapcount:0 compound_pincount:0
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
__do_sys_clone kernel/fork.c:2713 [inline]
__se_sys_clone kernel/fork.c:2697 [inline]
__x64_sys_clone+0x23f/0x290 kernel/fork.c:2697
destroy_args+0xfe/0x97f mm/debug_vm_pgtable.c:1018
debug_vm_pgtable+0x40d/0x462 mm/debug_vm_pgtable.c:1331
do_one_initcall+0x22b/0x7a0 init/main.c:1295
do_initcall_level+0x157/0x207 init/main.c:1368
do_initcalls+0x49/0x86 init/main.c:1384
kernel_init_freeable+0x43c/0x5c5 init/main.c:1608
kernel_init+0x19/0x290 init/main.c:1499
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Memory state around the buggy address:
ffff88807e772680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e772700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e772780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e772800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e772880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 48 89 df mov %rbx,%rdi
3: 48 c1 ef 03 shr $0x3,%rdi
7: 83 e7 18 and $0x18,%edi
a: 48 8b 6c 24 20 mov 0x20(%rsp),%rbp
f: 48 01 ef add %rbp,%rdi
12: be 08 00 00 00 mov $0x8,%esi
17: e8 46 1c 06 fe call 0xfe061c62
1c: 31 f6 xor %esi,%esi
1e: 48 0f a3 5d 00 bt %rbx,0x0(%rbp)
23: 0f 93 c3 setae %bl
26: 40 0f 92 c6 setb %sil
* 2a: bf 02 00 00 00 mov $0x2,%edi <-- trapping instruction
2f: e8 3e 78 bc fd call 0xfdbc7872
34: 84 db test %bl,%bl
36: 74 19 je 0x51
38: 41 0f b7 c7 movzwl %r15w,%eax
3c: 3d .byte 0x3d
3d: 00 01 add %al,(%rcx)
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: 35ecaa3632bf Linux 5.15.132
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1445005c680000
kernel config: https://syzkaller.appspot.com/x/.config?x=7e1620fbf0341078
dashboard link: https://syzkaller.appspot.com/bug?extid=c7d9b2e7d8efb0044656
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d3159c680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=157932a6680000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5544d1729cb8/disk-35ecaa36.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4e61190c49c1/vmlinux-35ecaa36.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e483f6e81777/bzImage-35ecaa36.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/d8a049097806/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c7d9b2...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
CPU: 1 PID: 3547 Comm: udevd Not tainted 5.15.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
__lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4026
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
__lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4026
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1737
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:tomoyo_check_acl+0x2f8/0x410 security/tomoyo/domain.c:184
Code: 48 89 df 48 c1 ef 03 83 e7 18 48 8b 6c 24 20 48 01 ef be 08 00 00 00 e8 46 1c 06 fe 31 f6 48 0f a3 5d 00 0f 93 c3 40 0f 92 c6 <bf> 02 00 00 00 e8 3e 78 bc fd 84 db 74 19 41 0f b7 c7 3d 00 01 00
RSP: 0018:ffffc90002d9f938 EFLAGS: 00000246
RAX: ffffffff83c3a701 RBX: 0000000000000001 RCX: ffffffff83c3a76a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888023b81ab8
RBP: ffff888023b81ab0 R08: dffffc0000000000 R09: ffffed1004770358
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000fe0
R13: dffffc0000000000 R14: ffffc90002d9fa68 R15: 0000000000000071
tomoyo_path_permission+0x1af/0x360 security/tomoyo/file.c:586
tomoyo_path_perm+0x436/0x6b0 security/tomoyo/file.c:838
security_inode_getattr+0xcf/0x120 security/security.c:1348
vfs_getattr+0x26/0x360 fs/stat.c:157
vfs_statx+0x18f/0x3b0 fs/stat.c:225
vfs_fstatat fs/stat.c:243 [inline]
__do_sys_newfstatat fs/stat.c:411 [inline]
__se_sys_newfstatat fs/stat.c:405 [inline]
__x64_sys_newfstatat+0x12c/0x1b0 fs/stat.c:405
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5cf0d705f4
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffdbe3888a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00007f5cf0d705f4
RDX: 00007ffdbe3888b8 RSI: 00007ffdbe388987 RDI: 00000000ffffff9c
RBP: 00007ffdbe3899c0 R08: 0000000000000000 R09: 00007ffdbe389348
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdbe3899d8
R13: 0000000000000000 R14: 0000000000000008 R15: 0000557973646910
</TASK>
Allocated by task 2:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
kernel_clone+0x210/0x960 kernel/fork.c:2596
Allocated by task 2:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
kernel_thread+0x168/0x1e0 kernel/fork.c:2648
create_kthread kernel/kthread.c:342 [inline]
kthreadd+0x57d/0x740 kernel/kthread.c:686
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Freed by task 3540:
kthreadd+0x57d/0x740 kernel/kthread.c:686
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
nilfs_segctor_destroy fs/nilfs2/segment.c:2761 [inline]
nilfs_detach_log_writer+0x2e6/0xbd0 fs/nilfs2/segment.c:2850
nilfs_put_super+0x49/0x150 fs/nilfs2/super.c:498
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1414
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff88807e771dc0
which belongs to the cache task_struct of size 7360
The buggy address is located 2600 bytes inside of
7360-byte region [ffff88807e771dc0, ffff88807e773a80)
The buggy address is located 2600 bytes inside of
The buggy address belongs to the page:
page:ffffea0001f9dc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e770
head:ffffea0001f9dc00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888011ddc3c0
raw: 0000000000000000 0000000000040004 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 2944, ts 11909193435, free_ts 10846199896
page_owner tracks the page as allocated
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
kernel_clone+0x210/0x960 kernel/fork.c:2596
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:886
copy_process+0x5eb/0x3ef0 kernel/fork.c:2030
__do_sys_clone kernel/fork.c:2713 [inline]
__se_sys_clone kernel/fork.c:2697 [inline]
__x64_sys_clone+0x23f/0x290 kernel/fork.c:2697
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_contig_range+0x95/0xf0 mm/page_alloc.c:9340
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
destroy_args+0xfe/0x97f mm/debug_vm_pgtable.c:1018
debug_vm_pgtable+0x40d/0x462 mm/debug_vm_pgtable.c:1331
do_one_initcall+0x22b/0x7a0 init/main.c:1295
do_initcall_level+0x157/0x207 init/main.c:1368
do_initcalls+0x49/0x86 init/main.c:1384
kernel_init_freeable+0x43c/0x5c5 init/main.c:1608
kernel_init+0x19/0x290 init/main.c:1499
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Memory state around the buggy address:
ffff88807e772700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e772780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e772800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e772880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 48 89 df mov %rbx,%rdi
3: 48 c1 ef 03 shr $0x3,%rdi
7: 83 e7 18 and $0x18,%edi
a: 48 8b 6c 24 20 mov 0x20(%rsp),%rbp
f: 48 01 ef add %rbp,%rdi
12: be 08 00 00 00 mov $0x8,%esi
17: e8 46 1c 06 fe call 0xfe061c62
1c: 31 f6 xor %esi,%esi
1e: 48 0f a3 5d 00 bt %rbx,0x0(%rbp)
23: 0f 93 c3 setae %bl
26: 40 0f 92 c6 setb %sil
* 2a: bf 02 00 00 00 mov $0x2,%edi <-- trapping instruction
2f: e8 3e 78 bc fd call 0xfdbc7872
34: 84 db test %bl,%bl
36: 74 19 je 0x51
38: 41 0f b7 c7 movzwl %r15w,%eax
3c: 3d .byte 0x3d
3d: 00 01 add %al,(%rcx)
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
Reply all
Reply to author
Forward
0 new messages