rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=523/1/0x4000000000000000 softirq=22957/22958 fqs=5145
(t=10500 jiffies g=35409 q=1314)
NMI backtrace for cpu 1
CPU: 1 PID: 12489 Comm: syz-executor.1 Not tainted 5.15.0-rc7-next-20211029-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:604 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2620
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:1428
__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:wq_list_add_head fs/io-wq.h:71 [inline]
RIP: 0010:__io_free_req+0x312/0x3c5 fs/io_uring.c:2040
Code: 00 00 48 8d 6b 78 4c 89 ef e8 e5 0f 42 00 49 8d bc 24 80 02 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a 48 c1 ea 03 80 3c 02 00 <74> 05 e8 52 57 e6 f8 48 89 ea b8 ff ff 37 00 4d 8b b4 24 80 02 00
RSP: 0018:ffffc90002a9fa78 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff8880727b5780 RCX: ffffffff815d4bb0
RDX: 1ffff11003021050 RSI: 0000000000000004 RDI: ffff888018108280
RBP: ffff8880727b57f8 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000553f41 R11: 0000000000000000 R12: ffff888018108000
R13: ffff8880181083c0 R14: ffff8880727b57d8 R15: ffff8880727b5780
tctx_task_work+0x1b3/0x630 fs/io_uring.c:2207
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0xc14/0x2b40 kernel/exit.c:832
do_group_exit+0x125/0x310 kernel/exit.c:929
get_signal+0x47d/0x21d0 kernel/signal.c:2820
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f17db64aae9
Code: Unable to access opcode bytes at RIP 0x7f17db64aabf.
RSP: 002b:00007f17d8b9f218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f17db75e028 RCX: 00007f17db64aae9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f17db75e028
RBP: 00007f17db75e020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f17db75e02c
R13: 00007fffaef6736f R14: 00007f17d8b9f300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 48 8d 6b 78 lea 0x78(%rbx),%rbp
6: 4c 89 ef mov %r13,%rdi
9: e8 e5 0f 42 00 callq 0x420ff3
e: 49 8d bc 24 80 02 00 lea 0x280(%r12),%rdi
15: 00
16: b8 ff ff 37 00 mov $0x37ffff,%eax
1b: 48 89 fa mov %rdi,%rdx
1e: 48 c1 e0 2a shl $0x2a,%rax
22: 48 c1 ea 03 shr $0x3,%rdx
26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
* 2a: 74 05 je 0x31 <-- trapping instruction
2c: e8 52 57 e6 f8 callq 0xf8e65783
31: 48 89 ea mov %rbp,%rdx
34: b8 ff ff 37 00 mov $0x37ffff,%eax
39: 4d rex.WRB
3a: 8b .byte 0x8b
3b: b4 24 mov $0x24,%ah
3d: 80 02 00 addb $0x0,(%rdx)