==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882
Read of size 8 at addr ffff888022f78a28 by task kworker/u4:2/154

CPU: 1 PID: 154 Comm: kworker/u4:2 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: loop4 loop_workfn

Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 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:4882
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 __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:4030
 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 __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:finish_lock_switch+0x91/0x100 kernel/sched/core.c:4785
Code: 45 31 c9 68 b7 90 59 81 e8 ec 1a 09 00 48 83 c4 08 4c 89 ff e8 60 da fe ff 66 90 4c 89 ff e8 b6 8a cd 08 e8 f1 4b 2d 00 fb 5b <41> 5c 41 5d 41 5e 41 5f c3 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 87
RSP: 0018:ffffc900010bf4f8 EFLAGS: 00000286
RAX: aa93cc34970c9a00 RBX: ffff8880129d8034 RCX: ffffffff81631958
RDX: dffffc0000000000 RSI: ffffffff8a8b2980 RDI: ffffffff8ad8f380
RBP: ffffc900010bf570 R08: dffffc0000000000 R09: fffffbfff1f7ec3a
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff11017367613 R14: ffff8880b9b3b098 R15: ffff8880b9b3a340
 finish_task_switch+0x134/0x630 kernel/sched/core.c:4902
 context_switch kernel/sched/core.c:5033 [inline]
 __schedule+0x12cc/0x45b0 kernel/sched/core.c:6376
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6552
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6577
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 blk_mq_raise_softirq block/blk-mq.c:653 [inline]
 blk_mq_complete_request_remote+0x518/0x640 block/blk-mq.c:673
 blk_mq_complete_request+0x15/0xa0 block/blk-mq.c:689
 loop_handle_cmd drivers/block/loop.c:2251 [inline]
 loop_process_work+0x19f1/0x2af0 drivers/block/loop.c:2274
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
 </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:894
 copy_process+0x5eb/0x3ef0 kernel/fork.c:2038
 kernel_clone+0x210/0x960 kernel/fork.c:2604
 kernel_thread+0x168/0x1e0 kernel/fork.c:2656
 create_kthread kernel/kthread.c:357 [inline]
 kthreadd+0x57a/0x740 kernel/kthread.c:701
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300

Freed by task 4175:
 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:2523 [inline]
 rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2763
 __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:3007 [inline]
 call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087
 context_switch kernel/sched/core.c:5033 [inline]
 __schedule+0x12cc/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x1bc/0x7b0 kernel/time/hrtimer.c:2045
 hrtimer_nanosleep+0x24d/0x490 kernel/time/hrtimer.c:2098
 __do_sys_nanosleep kernel/time/hrtimer.c:2133 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:2119 [inline]
 __x64_sys_nanosleep+0x265/0x2c0 kernel/time/hrtimer.c:2119
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

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:3007 [inline]
 call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087
 context_switch kernel/sched/core.c:5033 [inline]
 __schedule+0x12cc/0x45b0 kernel/sched/core.c:6376
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6552
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6577
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_read_unlock include/linux/rwlock_api_smp.h:227 [inline]
 _raw_read_unlock+0x36/0x40 kernel/locking/spinlock.c:260
 kill_something_info kernel/signal.c:1616 [inline]
 __do_sys_kill kernel/signal.c:3806 [inline]
 __se_sys_kill+0x515/0x610 kernel/signal.c:3800
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888022f78000
 which belongs to the cache task_struct of size 7360
The buggy address is located 2600 bytes inside of
 7360-byte region [ffff888022f78000, ffff888022f79cc0)
The buggy address belongs to the page:
page:ffffea00008bde00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22f78
head:ffffea00008bde00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888021efe3c1
flags: 0xfff80000010200(slab|head|node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000010200 dead000000000100 dead000000000122 ffff888011deb3c0
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888021efe3c1
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 144, ts 8824187846, free_ts 0
 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:5423
 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:894
 copy_process+0x5eb/0x3ef0 kernel/fork.c:2038
 kernel_clone+0x210/0x960 kernel/fork.c:2604
 kernel_thread+0x168/0x1e0 kernel/fork.c:2656
 call_usermodehelper_exec_work+0x58/0x220 kernel/umh.c:174
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888022f78900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022f78980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888022f78a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888022f78a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022f78b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	45 31 c9             	xor    %r9d,%r9d
   3:	68 b7 90 59 81       	push   $0xffffffff815990b7
   8:	e8 ec 1a 09 00       	call   0x91af9
   d:	48 83 c4 08          	add    $0x8,%rsp
  11:	4c 89 ff             	mov    %r15,%rdi
  14:	e8 60 da fe ff       	call   0xfffeda79
  19:	66 90                	xchg   %ax,%ax
  1b:	4c 89 ff             	mov    %r15,%rdi
  1e:	e8 b6 8a cd 08       	call   0x8cd8ad9
  23:	e8 f1 4b 2d 00       	call   0x2d4c19
  28:	fb                   	sti
  29:	5b                   	pop    %rbx
* 2a:	41 5c                	pop    %r12 <-- trapping instruction
  2c:	41 5d                	pop    %r13
  2e:	41 5e                	pop    %r14
  30:	41 5f                	pop    %r15
  32:	c3                   	ret
  33:	44 89 f1             	mov    %r14d,%ecx
  36:	80 e1 07             	and    $0x7,%cl
  39:	80 c1 03             	add    $0x3,%cl
  3c:	38 c1                	cmp    %al,%cl
  3e:	7c 87                	jl     0xffffffc7