rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (1 GPs behind) idle=eb7/1/0x4000000000000000 softirq=187019/187020 fqs=4719
(t=10502 jiffies g=303081 q=27566)
NMI backtrace for cpu 0
CPU: 0 PID: 56 Comm: kworker/u4:3 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:kasan_quarantine_put+0x9b/0x210 mm/kasan/quarantine.c:223
Code: 10 48 81 fb 00 00 10 00 48 89 58 10 77 78 4d 85 ed 75 6c 9c 58 f6 c4 02 0f 85 23 01 00 00 4d 85 ed b8 01 00 00 00 74 01 fb 5b <5d> 41 5c 41 5d 41 5e c3 e8 38 ae bf ff 48 c7 c3 00 5c 03 00 e8 ac
RSP: 0018:ffffc90001a2fa70 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffffc90001a2fb10 RCX: 1ffffffff1fb317e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88815b71e0c0 R08: 0000000000000001 R09: ffffffff8fd3aaff
R10: 0000000000000001 R11: 0000000000086089 R12: ffff888010c42640
R13: 0000000000000200 R14: ffffc90001a2fb18 R15: ffff88815b71e0c0
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1700 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1726
slab_free mm/slub.c:3492 [inline]
kfree+0xf3/0x550 mm/slub.c:4552
__io_remove_buffers.part.0+0x115/0x220 fs/io_uring.c:4327
__io_remove_buffers fs/io_uring.c:9263 [inline]
io_destroy_buffers fs/io_uring.c:9263 [inline]
io_ring_ctx_free fs/io_uring.c:9319 [inline]
io_ring_exit_work+0x74d/0xbe8 fs/io_uring.c:9495
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 10 48 81 adc %cl,-0x7f(%rax)
3: fb sti
4: 00 00 add %al,(%rax)
6: 10 00 adc %al,(%rax)
8: 48 89 58 10 mov %rbx,0x10(%rax)
c: 77 78 ja 0x86
e: 4d 85 ed test %r13,%r13
11: 75 6c jne 0x7f
13: 9c pushfq
14: 58 pop %rax
15: f6 c4 02 test $0x2,%ah
18: 0f 85 23 01 00 00 jne 0x141
1e: 4d 85 ed test %r13,%r13
21: b8 01 00 00 00 mov $0x1,%eax
26: 74 01 je 0x29
28: fb sti
29: 5b pop %rbx
* 2a: 5d pop %rbp <-- trapping instruction
2b: 41 5c pop %r12
2d: 41 5d pop %r13
2f: 41 5e pop %r14
31: c3 retq
32: e8 38 ae bf ff callq 0xffbfae6f
37: 48 c7 c3 00 5c 03 00 mov $0x35c00,%rbx
3e: e8 .byte 0xe8
3f: ac lods %ds:(%rsi),%al