==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x1fd0 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff88801a74a810 by task pool_workqueue_/3
CPU: 0 PID: 3 Comm: pool_workqueue_ Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
__lock_acquire+0x78/0x1fd0 kernel/locking/lockdep.c:5005
lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
call_timer_fn+0x180/0x600 kernel/time/timer.c:1792
expire_timers kernel/time/timer.c:1843 [inline]
__run_timers kernel/time/timer.c:2408 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2419
run_timer_base kernel/time/timer.c:2428 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2438
__do_softirq+0x2be/0x943 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0xf6/0x1c0 kernel/sched/core.c:7058
Code: 89 f5 49 c1 ed 03 eb 0d 48 f7 03 08 00 00 00 0f 84 8b 00 00 00 bf 01 00 00 00 e8 d5 6c e7 f5 e8 30 a7 1e f6 fb bf 01 00 00 00 95 ad ff ff 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 85 c7 7a f6 48
RSP: 0018:ffffc90000087b40 EFLAGS: 00000286
RAX: 9395192e4ef1be00 RBX: 1ffff92000010f70 RCX: ffffffff944dd603
RDX: dffffc0000000000 RSI: ffffffff8baac1e0 RDI: 0000000000000001
RBP: ffffc90000087bf0 R08: ffffffff8f873a6f R09: 1ffffffff1f0e74d
R10: dffffc0000000000 R11: fffffbfff1f0e74e R12: 1ffff92000010f68
R13: 1ffff92000010f6c R14: ffffc90000087b60 R15: dffffc0000000000
irqentry_exit+0x5e/0x90 kernel/entry/common.c:348
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:synchronize_rcu+0x0/0x3e0 kernel/rcu/tree.c:3601
Code: e1 07 80 c1 03 38 c1 0f 8c 97 fe ff ff 4c 89 f7 e8 65 aa 7c 00 e9 8a fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc90000087cb8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000010fa0 RCX: ffffffff944dd603
RDX: 0000777d588c8b01 RSI: ffffffff8baacec0 RDI: ffffffff8bfed300
RBP: ffffc90000087da0 R08: ffffffff8141ef75 R09: 1ffffffff1f0e74d
R10: dffffc0000000000 R11: fffffbfff1f0e74e R12: ffffffff944d0bc8
R13: 1ffff92000010f9c R14: 0000000000000216 R15: ffffc90000087d00
lockdep_unregister_key+0x4b7/0x540 kernel/locking/lockdep.c:6475
wq_unregister_lockdep kernel/workqueue.c:4655 [inline]
pwq_release_workfn+0x6e0/0x840 kernel/workqueue.c:4958
kthread_worker_fn+0x4c1/0xab0 kernel/kthread.c:841
kthread+0x2f2/0x390 kernel/kthread.c:388
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
Allocated by task 2:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:312 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3798 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x194/0x380 mm/slub.c:3888
alloc_task_struct_node kernel/fork.c:176 [inline]
dup_task_struct+0x57/0x7d0 kernel/fork.c:1106
copy_process+0x5d1/0x3df0 kernel/fork.c:2219
kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
kernel_thread+0x1bc/0x240 kernel/fork.c:2858
create_kthread kernel/kthread.c:411 [inline]
kthreadd+0x60d/0x810 kernel/kthread.c:764
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
Freed by task 11192:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2106 [inline]
slab_free mm/slub.c:4280 [inline]
kmem_cache_free+0x102/0x2b0 mm/slub.c:4344
put_task_struct include/linux/sched/task.h:138 [inline]
delayed_put_task_struct+0x115/0x2d0 kernel/exit.c:229
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0xaff/0x1830 kernel/rcu/tree.c:2471
__do_softirq+0x2be/0x943 kernel/softirq.c:554
Last potentially related work creation:
kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
__kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:2734 [inline]
call_rcu+0x167/0xa70 kernel/rcu/tree.c:2838
context_switch kernel/sched/core.c:5412 [inline]
__schedule+0x17db/0x4a20 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
nilfs_segctor_kill_thread fs/nilfs2/segment.c:2682 [inline]
nilfs_segctor_destroy fs/nilfs2/segment.c:2764 [inline]
nilfs_detach_log_writer+0x2e8/0xbe0 fs/nilfs2/segment.c:2853
nilfs_put_super+0x4d/0x160 fs/nilfs2/super.c:499
generic_shutdown_super+0x138/0x2d0 fs/super.c:641
kill_block_super+0x44/0x90 fs/super.c:1675
deactivate_locked_super+0xc6/0x130 fs/super.c:472
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
task_work_run+0x251/0x310 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:212
do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6d/0x75
The buggy address belongs to the object at ffff88801a749e00
which belongs to the cache task_struct of size 7424
The buggy address is located 2576 bytes inside of
freed 7424-byte region [ffff88801a749e00, ffff88801a74bb00)
The buggy address belongs to the physical page:
page:ffffea000069d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a748
head:ffffea000069d200 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888024255081
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888015ae6500 ffffea0000838a00 dead000000000002
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888024255081
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 42, tgid 42 (kworker/u8:2), ts 7780162046, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
__alloc_pages+0x256/0x680 mm/page_alloc.c:4569
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2175
allocate_slab mm/slub.c:2338 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2391
___slab_alloc+0xc73/0x1260 mm/slub.c:3525
__slab_alloc mm/slub.c:3610 [inline]
__slab_alloc_node mm/slub.c:3663 [inline]
slab_alloc_node mm/slub.c:3835 [inline]
kmem_cache_alloc_node+0x24a/0x380 mm/slub.c:3888
alloc_task_struct_node kernel/fork.c:176 [inline]
dup_task_struct+0x57/0x7d0 kernel/fork.c:1106
copy_process+0x5d1/0x3df0 kernel/fork.c:2219
kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
user_mode_thread+0x132/0x1a0 kernel/fork.c:2874
call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:172
process_one_work kernel/workqueue.c:3254 [inline]
process_scheduled_works+0xa02/0x1770 kernel/workqueue.c:3335
worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
kthread+0x2f2/0x390 kernel/kthread.c:388
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
page_owner free stack trace missing
Memory state around the buggy address:
ffff88801a74a700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801a74a780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801a74a800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801a74a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801a74a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 f5 mov %esi,%ebp
2: 49 c1 ed 03 shr $0x3,%r13
6: eb 0d jmp 0x15
8: 48 f7 03 08 00 00 00 testq $0x8,(%rbx)
f: 0f 84 8b 00 00 00 je 0xa0
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 d5 6c e7 f5 call 0xf5e76cf4
1f: e8 30 a7 1e f6 call 0xf61ea754
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 95 ad ff ff call 0xffffadc4 <-- trapping instruction
2f: 43 80 7c 3d 00 00 cmpb $0x0,0x0(%r13,%r15,1)
35: 74 08 je 0x3f
37: 4c 89 f7 mov %r14,%rdi
3a: e8 85 c7 7a f6 call 0xf67ac7c4
3f: 48 rex.W