KASAN: use-after-free Read in io_kill_linked_timeout
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syzbot
Jan 16, 2022, 12:00:16 PM1/16/22
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: d605f2f30d54 Merge 5.10.91 into android12-5.10-lts
git tree: android12-5.10-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=122d7bb0700000
kernel config: https://syzkaller.appspot.com/x/.config?x=21ff143efa71c71c
dashboard link: https://syzkaller.appspot.com/bug?extid=694deebd17dcc89c73f8
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+694dee...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
Read of size 4 at addr ffff88811107a198 by task io_wq_manager/4033
CPU: 0 PID: 4033 Comm: io_wq_manager Not tainted 5.10.91-syzkaller-00882-gd605f2f30d54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
print_address_description+0x8d/0x3d0 mm/kasan/report.c:233
__kasan_report+0x142/0x220 mm/kasan/report.c:419
kasan_report+0x51/0x70 mm/kasan/report.c:436
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Allocated by task 4045:
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:428 [inline]
__kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:583 [inline]
kmem_cache_alloc_bulk+0x2d5/0x3f0 mm/slub.c:3406
io_alloc_req fs/io_uring.c:1857 [inline]
io_submit_sqes+0x6bf/0x2da0 fs/io_uring.c:6697
__do_sys_io_uring_enter fs/io_uring.c:9113 [inline]
__se_sys_io_uring_enter+0x322/0x12b0 fs/io_uring.c:9055
__x64_sys_io_uring_enter+0xe5/0x100 fs/io_uring.c:9055
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 4033:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
____kasan_slab_free+0x133/0x170 mm/kasan/common.c:360
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1596 [inline]
slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1622
slab_free mm/slub.c:3204 [inline]
kmem_cache_free+0xb5/0x1f0 mm/slub.c:3220
__io_free_req+0x20e/0x380 fs/io_uring.c:1912
io_free_req fs/io_uring.c:2137 [inline]
io_put_req_deferred_cb+0x64/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:345
task_work_add+0xa7/0x320 kernel/task_work.c:39
io_free_req_deferred fs/io_uring.c:2246 [inline]
io_put_req_deferred+0x1c6/0x240 fs/io_uring.c:2254
io_link_timeout_fn+0x4c8/0x600 fs/io_uring.c:6279
__run_hrtimer+0x199/0x6a0 kernel/time/hrtimer.c:1583
__hrtimer_run_queues kernel/time/hrtimer.c:1647 [inline]
hrtimer_interrupt+0x639/0x1380 kernel/time/hrtimer.c:1709
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1084 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x3c0 arch/x86/kernel/apic/apic.c:1101
asm_call_irq_on_stack+0xf/0x20
__run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
sysvec_apic_timer_interrupt+0x85/0xe0 arch/x86/kernel/apic/apic.c:1095
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
The buggy address belongs to the object at ffff88811107a140
which belongs to the cache io_kiocb of size 216
The buggy address is located 88 bytes inside of
216-byte region [ffff88811107a140, ffff88811107a218)
The buggy address belongs to the page:
page:ffffea0004441e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11107a
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881049f0a80
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4022, ts 1717826031038, free_ts 1717742270693
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook mm/page_alloc.c:2385 [inline]
prep_new_page mm/page_alloc.c:2391 [inline]
get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063
__alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5106
alloc_slab_page mm/slub.c:1807 [inline]
allocate_slab+0x6b/0x350 mm/slub.c:1809
new_slab mm/slub.c:1870 [inline]
new_slab_objects mm/slub.c:2629 [inline]
___slab_alloc+0x143/0x2f0 mm/slub.c:2792
__slab_alloc mm/slub.c:2832 [inline]
slab_alloc_node mm/slub.c:2914 [inline]
slab_alloc mm/slub.c:2956 [inline]
kmem_cache_alloc+0x26f/0x380 mm/slub.c:2961
io_ring_ctx_alloc fs/io_uring.c:1186 [inline]
io_uring_create+0x4ff/0x3490 fs/io_uring.c:9414
io_uring_setup fs/io_uring.c:9557 [inline]
__do_sys_io_uring_setup fs/io_uring.c:9563 [inline]
__se_sys_io_uring_setup fs/io_uring.c:9560 [inline]
__x64_sys_io_uring_setup+0x1ce/0x290 fs/io_uring.c:9560
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1331 [inline]
free_pcp_prepare+0x18f/0x1c0 mm/page_alloc.c:1405
free_unref_page_prepare mm/page_alloc.c:3291 [inline]
free_unref_page mm/page_alloc.c:3341 [inline]
free_the_page mm/page_alloc.c:5165 [inline]
__free_pages+0x2e3/0x4a0 mm/page_alloc.c:5173
__vunmap+0x856/0x980 mm/vmalloc.c:2275
free_work+0x66/0x90 mm/vmalloc.c:68
process_one_work+0x6b4/0xfb0 kernel/workqueue.c:2289
worker_thread+0xb15/0x1600 kernel/workqueue.c:2435
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Memory state around the buggy address:
ffff88811107a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88811107a100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff88811107a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88811107a200: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88811107a280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 4033 at lib/refcount.c:28 refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 4033 Comm: io_wq_manager Tainted: G B 5.10.91-syzkaller-00882-gd605f2f30d54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Code: c7 20 b8 49 85 31 c0 e8 19 5d eb fe 0f 0b eb 83 e8 30 6f 18 ff c6 05 3e ba 68 04 01 48 c7 c7 80 b8 49 85 31 c0 e8 fb 5c eb fe <0f> 0b e9 62 ff ff ff e8 0f 6f 18 ff c6 05 1e ba 68 04 01 48 c7 c7
RSP: 0018:ffffc9000bca7cd0 EFLAGS: 00010246
RAX: 1e2ec332c4afaa00 RBX: 0000000000000003 RCX: 1ffff92001794f54
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000bca7ce0 R08: ffffffff81545408 R09: ffffed103ee0a5d8
R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff88811107a1b0
R13: ffff88811107aa58 R14: 0000000000000003 R15: 00000000ffffffff
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001380 CR3: 0000000150a9a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_sub_and_test include/linux/refcount.h:283 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
io_put_req fs/io_uring.c:2225 [inline]
io_kill_linked_timeout+0x3f4/0x960 fs/io_uring.c:1949
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
---[ end trace 5e74dfe7a09f55ae ]---
---
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 found the following issue on:
HEAD commit: d605f2f30d54 Merge 5.10.91 into android12-5.10-lts
git tree: android12-5.10-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=122d7bb0700000
kernel config: https://syzkaller.appspot.com/x/.config?x=21ff143efa71c71c
dashboard link: https://syzkaller.appspot.com/bug?extid=694deebd17dcc89c73f8
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+694dee...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
Read of size 4 at addr ffff88811107a198 by task io_wq_manager/4033
CPU: 0 PID: 4033 Comm: io_wq_manager Not tainted 5.10.91-syzkaller-00882-gd605f2f30d54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
print_address_description+0x8d/0x3d0 mm/kasan/report.c:233
__kasan_report+0x142/0x220 mm/kasan/report.c:419
kasan_report+0x51/0x70 mm/kasan/report.c:436
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Allocated by task 4045:
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:428 [inline]
__kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:583 [inline]
kmem_cache_alloc_bulk+0x2d5/0x3f0 mm/slub.c:3406
io_alloc_req fs/io_uring.c:1857 [inline]
io_submit_sqes+0x6bf/0x2da0 fs/io_uring.c:6697
__do_sys_io_uring_enter fs/io_uring.c:9113 [inline]
__se_sys_io_uring_enter+0x322/0x12b0 fs/io_uring.c:9055
__x64_sys_io_uring_enter+0xe5/0x100 fs/io_uring.c:9055
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 4033:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
____kasan_slab_free+0x133/0x170 mm/kasan/common.c:360
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1596 [inline]
slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1622
slab_free mm/slub.c:3204 [inline]
kmem_cache_free+0xb5/0x1f0 mm/slub.c:3220
__io_free_req+0x20e/0x380 fs/io_uring.c:1912
io_free_req fs/io_uring.c:2137 [inline]
io_put_req_deferred_cb+0x64/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:345
task_work_add+0xa7/0x320 kernel/task_work.c:39
io_free_req_deferred fs/io_uring.c:2246 [inline]
io_put_req_deferred+0x1c6/0x240 fs/io_uring.c:2254
io_link_timeout_fn+0x4c8/0x600 fs/io_uring.c:6279
__run_hrtimer+0x199/0x6a0 kernel/time/hrtimer.c:1583
__hrtimer_run_queues kernel/time/hrtimer.c:1647 [inline]
hrtimer_interrupt+0x639/0x1380 kernel/time/hrtimer.c:1709
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1084 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x3c0 arch/x86/kernel/apic/apic.c:1101
asm_call_irq_on_stack+0xf/0x20
__run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
sysvec_apic_timer_interrupt+0x85/0xe0 arch/x86/kernel/apic/apic.c:1095
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
The buggy address belongs to the object at ffff88811107a140
which belongs to the cache io_kiocb of size 216
The buggy address is located 88 bytes inside of
216-byte region [ffff88811107a140, ffff88811107a218)
The buggy address belongs to the page:
page:ffffea0004441e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11107a
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881049f0a80
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4022, ts 1717826031038, free_ts 1717742270693
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook mm/page_alloc.c:2385 [inline]
prep_new_page mm/page_alloc.c:2391 [inline]
get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063
__alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5106
alloc_slab_page mm/slub.c:1807 [inline]
allocate_slab+0x6b/0x350 mm/slub.c:1809
new_slab mm/slub.c:1870 [inline]
new_slab_objects mm/slub.c:2629 [inline]
___slab_alloc+0x143/0x2f0 mm/slub.c:2792
__slab_alloc mm/slub.c:2832 [inline]
slab_alloc_node mm/slub.c:2914 [inline]
slab_alloc mm/slub.c:2956 [inline]
kmem_cache_alloc+0x26f/0x380 mm/slub.c:2961
io_ring_ctx_alloc fs/io_uring.c:1186 [inline]
io_uring_create+0x4ff/0x3490 fs/io_uring.c:9414
io_uring_setup fs/io_uring.c:9557 [inline]
__do_sys_io_uring_setup fs/io_uring.c:9563 [inline]
__se_sys_io_uring_setup fs/io_uring.c:9560 [inline]
__x64_sys_io_uring_setup+0x1ce/0x290 fs/io_uring.c:9560
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1331 [inline]
free_pcp_prepare+0x18f/0x1c0 mm/page_alloc.c:1405
free_unref_page_prepare mm/page_alloc.c:3291 [inline]
free_unref_page mm/page_alloc.c:3341 [inline]
free_the_page mm/page_alloc.c:5165 [inline]
__free_pages+0x2e3/0x4a0 mm/page_alloc.c:5173
__vunmap+0x856/0x980 mm/vmalloc.c:2275
free_work+0x66/0x90 mm/vmalloc.c:68
process_one_work+0x6b4/0xfb0 kernel/workqueue.c:2289
worker_thread+0xb15/0x1600 kernel/workqueue.c:2435
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Memory state around the buggy address:
ffff88811107a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88811107a100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff88811107a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88811107a200: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88811107a280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 4033 at lib/refcount.c:28 refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 4033 Comm: io_wq_manager Tainted: G B 5.10.91-syzkaller-00882-gd605f2f30d54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Code: c7 20 b8 49 85 31 c0 e8 19 5d eb fe 0f 0b eb 83 e8 30 6f 18 ff c6 05 3e ba 68 04 01 48 c7 c7 80 b8 49 85 31 c0 e8 fb 5c eb fe <0f> 0b e9 62 ff ff ff e8 0f 6f 18 ff c6 05 1e ba 68 04 01 48 c7 c7
RSP: 0018:ffffc9000bca7cd0 EFLAGS: 00010246
RAX: 1e2ec332c4afaa00 RBX: 0000000000000003 RCX: 1ffff92001794f54
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000bca7ce0 R08: ffffffff81545408 R09: ffffed103ee0a5d8
R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff88811107a1b0
R13: ffff88811107aa58 R14: 0000000000000003 R15: 00000000ffffffff
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001380 CR3: 0000000150a9a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_sub_and_test include/linux/refcount.h:283 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
io_put_req fs/io_uring.c:2225 [inline]
io_kill_linked_timeout+0x3f4/0x960 fs/io_uring.c:1949
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
---[ end trace 5e74dfe7a09f55ae ]---
---
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
Jan 23, 2022, 10:40:22 AM1/23/22
to syzkaller-a...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 0347b1658399 Merge 5.10.93 into android12-5.10-lts
git tree: android12-5.10-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=1113d918700000
kernel config: https://syzkaller.appspot.com/x/.config?x=e0f3947457f8d2a4
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116bb65bb00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+694dee...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
Read of size 4 at addr ffff888117e842d8 by task io_wq_manager/12477
CPU: 0 PID: 12477 Comm: io_wq_manager Not tainted 5.10.93-syzkaller-01028-g0347b1658399 #0
slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1628
slab_free mm/slub.c:3210 [inline]
kmem_cache_free+0xb5/0x1f0 mm/slub.c:3226
flags: 0x8000000000000200(slab)
raw: 8000000000000200 ffffea0004323a00 0000000400000004 ffff8881041bc600
raw: ffff888117e84b40 00000000800c0009 00000001ffffffff 0000000000000000
allocate_slab+0x6b/0x350 mm/slub.c:1815
new_slab mm/slub.c:1876 [inline]
new_slab_objects mm/slub.c:2635 [inline]
___slab_alloc+0x143/0x2f0 mm/slub.c:2798
__slab_alloc mm/slub.c:2838 [inline]
slab_alloc_node mm/slub.c:2920 [inline]
slab_alloc mm/slub.c:2962 [inline]
kmem_cache_alloc+0x26f/0x380 mm/slub.c:2967
release_pages+0xa62/0xaa0 mm/swap.c:1081
free_pages_and_swap_cache+0x88/0xa0 mm/swap_state.c:356
tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
tlb_flush_mmu+0x8c0/0xaa0 mm/mmu_gather.c:249
tlb_finish_mmu+0xd2/0x1f0 mm/mmu_gather.c:328
exit_mmap+0x319/0x5c0 mm/mmap.c:3328
__mmput+0x95/0x2c0 kernel/fork.c:1133
mmput+0x4b/0x50 kernel/fork.c:1154
exit_mm+0x615/0x7e0 kernel/exit.c:489
do_exit+0x6c4/0x23a0 kernel/exit.c:800
do_group_exit+0x16a/0x2d0 kernel/exit.c:910
__do_sys_exit_group+0x17/0x20 kernel/exit.c:921
__se_sys_exit_group+0x14/0x20 kernel/exit.c:919
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:919
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
Memory state around the buggy address:
ffff888117e84180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888117e84200: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888117e84280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888117e84300: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
ffff888117e84380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
Modules linked in:
CPU: 1 PID: 12477 Comm: io_wq_manager Tainted: G B 5.10.93-syzkaller-01028-g0347b1658399 #0
RSP: 0018:ffffc90007f47cd0 EFLAGS: 00010246
RAX: c3d6f5e2e3f76500 RBX: 0000000000000003 RCX: 1ffff92000fe8f54
R10: ffffed103ee2a5d8 R11: 0000000000000000 R12: ffff888117e842f0
R13: ffff88810a2d2918 R14: 0000000000000003 R15: 00000000ffffffff
HEAD commit: 0347b1658399 Merge 5.10.93 into android12-5.10-lts
git tree: android12-5.10-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=1113d918700000
kernel config: https://syzkaller.appspot.com/x/.config?x=e0f3947457f8d2a4
dashboard link: https://syzkaller.appspot.com/bug?extid=694deebd17dcc89c73f8
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1384251fb00000
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116bb65bb00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+694dee...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
CPU: 0 PID: 12477 Comm: io_wq_manager Not tainted 5.10.93-syzkaller-01028-g0347b1658399 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
print_address_description+0x8d/0x3d0 mm/kasan/report.c:233
__kasan_report+0x142/0x220 mm/kasan/report.c:419
kasan_report+0x51/0x70 mm/kasan/report.c:436
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Allocated by task 12474:
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
print_address_description+0x8d/0x3d0 mm/kasan/report.c:233
__kasan_report+0x142/0x220 mm/kasan/report.c:419
kasan_report+0x51/0x70 mm/kasan/report.c:436
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
io_kill_linked_timeout+0x7fa/0x960 fs/io_uring.c:1932
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
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:428 [inline]
__kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:583 [inline]
kmem_cache_alloc_bulk+0x2d5/0x3f0 mm/slub.c:3412
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:428 [inline]
__kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:583 [inline]
io_alloc_req fs/io_uring.c:1857 [inline]
io_submit_sqes+0x6bf/0x2da0 fs/io_uring.c:6697
__do_sys_io_uring_enter fs/io_uring.c:9113 [inline]
__se_sys_io_uring_enter+0x322/0x12b0 fs/io_uring.c:9055
__x64_sys_io_uring_enter+0xe5/0x100 fs/io_uring.c:9055
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 12477:
io_submit_sqes+0x6bf/0x2da0 fs/io_uring.c:6697
__do_sys_io_uring_enter fs/io_uring.c:9113 [inline]
__se_sys_io_uring_enter+0x322/0x12b0 fs/io_uring.c:9055
__x64_sys_io_uring_enter+0xe5/0x100 fs/io_uring.c:9055
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
____kasan_slab_free+0x133/0x170 mm/kasan/common.c:360
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1602 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
____kasan_slab_free+0x133/0x170 mm/kasan/common.c:360
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1628
slab_free mm/slub.c:3210 [inline]
kmem_cache_free+0xb5/0x1f0 mm/slub.c:3226
__io_free_req+0x20e/0x380 fs/io_uring.c:1912
io_free_req fs/io_uring.c:2137 [inline]
io_put_req_deferred_cb+0x64/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:345
task_work_add+0xa7/0x320 kernel/task_work.c:39
io_free_req_deferred fs/io_uring.c:2246 [inline]
io_put_req_deferred+0x1c6/0x240 fs/io_uring.c:2254
io_link_timeout_fn+0x4c8/0x600 fs/io_uring.c:6279
__run_hrtimer+0x199/0x6a0 kernel/time/hrtimer.c:1583
__hrtimer_run_queues kernel/time/hrtimer.c:1647 [inline]
hrtimer_interrupt+0x639/0x1380 kernel/time/hrtimer.c:1709
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1084 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x3c0 arch/x86/kernel/apic/apic.c:1101
asm_call_irq_on_stack+0xf/0x20
__run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
sysvec_apic_timer_interrupt+0x85/0xe0 arch/x86/kernel/apic/apic.c:1095
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
The buggy address belongs to the object at ffff888117e84280
io_free_req fs/io_uring.c:2137 [inline]
io_put_req_deferred_cb+0x64/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:345
task_work_add+0xa7/0x320 kernel/task_work.c:39
io_free_req_deferred fs/io_uring.c:2246 [inline]
io_put_req_deferred+0x1c6/0x240 fs/io_uring.c:2254
io_link_timeout_fn+0x4c8/0x600 fs/io_uring.c:6279
__run_hrtimer+0x199/0x6a0 kernel/time/hrtimer.c:1583
__hrtimer_run_queues kernel/time/hrtimer.c:1647 [inline]
hrtimer_interrupt+0x639/0x1380 kernel/time/hrtimer.c:1709
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1084 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x3c0 arch/x86/kernel/apic/apic.c:1101
asm_call_irq_on_stack+0xf/0x20
__run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
sysvec_apic_timer_interrupt+0x85/0xe0 arch/x86/kernel/apic/apic.c:1095
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
which belongs to the cache io_kiocb of size 216
The buggy address is located 88 bytes inside of
216-byte region [ffff888117e84280, ffff888117e84358)
The buggy address is located 88 bytes inside of
The buggy address belongs to the page:
page:ffffea00045fa100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888117e84b40 pfn:0x117e84
flags: 0x8000000000000200(slab)
raw: 8000000000000200 ffffea0004323a00 0000000400000004 ffff8881041bc600
raw: ffff888117e84b40 00000000800c0009 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1992, ts 36652228018, free_ts 36650470740
page_owner tracks the page as allocated
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook mm/page_alloc.c:2385 [inline]
prep_new_page mm/page_alloc.c:2391 [inline]
get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063
__alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5106
alloc_slab_page mm/slub.c:1813 [inline]
post_alloc_hook mm/page_alloc.c:2385 [inline]
prep_new_page mm/page_alloc.c:2391 [inline]
get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063
__alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5106
allocate_slab+0x6b/0x350 mm/slub.c:1815
new_slab mm/slub.c:1876 [inline]
new_slab_objects mm/slub.c:2635 [inline]
___slab_alloc+0x143/0x2f0 mm/slub.c:2798
__slab_alloc mm/slub.c:2838 [inline]
slab_alloc_node mm/slub.c:2920 [inline]
slab_alloc mm/slub.c:2962 [inline]
kmem_cache_alloc+0x26f/0x380 mm/slub.c:2967
io_ring_ctx_alloc fs/io_uring.c:1186 [inline]
io_uring_create+0x4ff/0x3490 fs/io_uring.c:9414
io_uring_setup fs/io_uring.c:9557 [inline]
__do_sys_io_uring_setup fs/io_uring.c:9563 [inline]
__se_sys_io_uring_setup fs/io_uring.c:9560 [inline]
__x64_sys_io_uring_setup+0x1ce/0x290 fs/io_uring.c:9560
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1331 [inline]
free_pcp_prepare+0x18f/0x1c0 mm/page_alloc.c:1405
free_unref_page_prepare mm/page_alloc.c:3291 [inline]
free_unref_page_list+0x116/0x5d0 mm/page_alloc.c:3361
io_uring_create+0x4ff/0x3490 fs/io_uring.c:9414
io_uring_setup fs/io_uring.c:9557 [inline]
__do_sys_io_uring_setup fs/io_uring.c:9563 [inline]
__se_sys_io_uring_setup fs/io_uring.c:9560 [inline]
__x64_sys_io_uring_setup+0x1ce/0x290 fs/io_uring.c:9560
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1331 [inline]
free_pcp_prepare+0x18f/0x1c0 mm/page_alloc.c:1405
free_unref_page_prepare mm/page_alloc.c:3291 [inline]
release_pages+0xa62/0xaa0 mm/swap.c:1081
free_pages_and_swap_cache+0x88/0xa0 mm/swap_state.c:356
tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
tlb_flush_mmu+0x8c0/0xaa0 mm/mmu_gather.c:249
tlb_finish_mmu+0xd2/0x1f0 mm/mmu_gather.c:328
exit_mmap+0x319/0x5c0 mm/mmap.c:3328
__mmput+0x95/0x2c0 kernel/fork.c:1133
mmput+0x4b/0x50 kernel/fork.c:1154
exit_mm+0x615/0x7e0 kernel/exit.c:489
do_exit+0x6c4/0x23a0 kernel/exit.c:800
do_group_exit+0x16a/0x2d0 kernel/exit.c:910
__do_sys_exit_group+0x17/0x20 kernel/exit.c:921
__se_sys_exit_group+0x14/0x20 kernel/exit.c:919
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:919
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
Memory state around the buggy address:
ffff888117e84200: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888117e84280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888117e84300: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
ffff888117e84380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 12477 at lib/refcount.c:28 refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
Modules linked in:
CPU: 1 PID: 12477 Comm: io_wq_manager Tainted: G B 5.10.93-syzkaller-01028-g0347b1658399 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Code: c7 a0 bd 49 85 31 c0 e8 e9 34 eb fe 0f 0b eb 83 e8 c0 4e 18 ff c6 05 0e 95 68 04 01 48 c7 c7 00 be 49 85 31 c0 e8 cb 34 eb fe <0f> 0b e9 62 ff ff ff e8 9f 4e 18 ff c6 05 ee 94 68 04 01 48 c7 c7
RIP: 0010:refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
RSP: 0018:ffffc90007f47cd0 EFLAGS: 00010246
RAX: c3d6f5e2e3f76500 RBX: 0000000000000003 RCX: 1ffff92000fe8f54
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90007f47ce0 R08: ffffffff815457c8 R09: ffffed103ee2a5d8
R10: ffffed103ee2a5d8 R11: 0000000000000000 R12: ffff888117e842f0
R13: ffff88810a2d2918 R14: 0000000000000003 R15: 00000000ffffffff
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ab366c1d0 CR3: 0000000117519000 CR4: 00000000003506a0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_sub_and_test include/linux/refcount.h:283 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
io_put_req fs/io_uring.c:2225 [inline]
io_kill_linked_timeout+0x3f4/0x960 fs/io_uring.c:1949
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
---[ end trace 8879259892d57858 ]---
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_sub_and_test include/linux/refcount.h:283 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
io_put_req fs/io_uring.c:2225 [inline]
io_kill_linked_timeout+0x3f4/0x960 fs/io_uring.c:1949
__io_req_find_next fs/io_uring.c:2011 [inline]
io_req_find_next fs/io_uring.c:2029 [inline]
io_queue_next fs/io_uring.c:2128 [inline]
io_free_req fs/io_uring.c:2136 [inline]
io_put_req_deferred_cb+0xb2/0x520 fs/io_uring.c:2233
task_work_run+0x147/0x1b0 kernel/task_work.c:154
io_wq_manager+0x1aa/0x8b0 fs/io-wq.c:797
kthread+0x371/0x390 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
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