rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=f4f/1/0x4000000000000000 softirq=160087/160088 fqs=4821
(t=10500 jiffies g=216257 q=1300)
NMI backtrace for cpu 1
CPU: 1 PID: 23146 Comm: syz-executor.1 Not tainted 5.16.0-rc1-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 ae 2e 15 f8 48 89 ef e8 f6 a4 15 f8 e8 51 64 36 f8 fb bf 01 00 00 00 16 6f 08 f8 65 8b 05 2f bd bb 76 85 c0 74 02 5d c3 e8 4b 92 b9
RSP: 0018:ffffc90000fd8e08 EFLAGS: 00000202
RAX: 0000000000ee21ce RBX: ffffffff874770e0 RCX: 1ffffffff1b21701
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffff8880b9d28280 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817d1748 R11: 0000000000000000 R12: ffffc90000fd8e98
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b9d28280
expire_timers kernel/time/timer.c:1465 [inline]
__run_timers.part.0+0x665/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:60 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:342 [inline]
RIP: 0010:deref_stack_reg+0x90/0x150 arch/x86/kernel/unwind_orc.c:352
Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 94 00 00 00 49 39 ed 49 8b 44 24 10 77 13 48 39 e8 76 0e <48> 8d 55 08 48 39 d0 72 05 49 39 d5 72 3b 49 8d 7c 24 28 48 b8 00
RSP: 0018:ffffc9001a9f7540 EFLAGS: 00000212
RAX: ffffc9001a9f8000 RBX: ffffc9001a9f7690 RCX: ffffffff8e177d01
RDX: 1ffff9200353eecb RSI: ffffc9001a9f7998 RDI: ffffc9001a9f7658
RBP: ffffc9001a9f7998 R08: ffffffff8e177cfc R09: 0000000000000001
R10: fffff5200353eed4 R11: 000000000008808a R12: ffffc9001a9f7648
R13: ffffc9001a9f0000 R14: ffffc9001a9f7648 R15: ffffffff8e177d00
unwind_next_frame+0xcdc/0x1ce0 arch/x86/kernel/unwind_orc.c:534
arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
__kasan_record_aux_stack+0xb5/0xe0 mm/kasan/generic.c:348
task_work_add+0x3a/0x190 kernel/task_work.c:38
mntput_no_expire+0x6e5/0xcd0 fs/namespace.c:1216
mntput fs/namespace.c:1233 [inline]
namespace_unlock+0x26b/0x410 fs/namespace.c:1452
drop_collected_mounts fs/namespace.c:1935 [inline]
put_mnt_ns fs/namespace.c:4344 [inline]
put_mnt_ns+0x106/0x140 fs/namespace.c:4340
free_nsproxy+0x43/0x4c0 kernel/nsproxy.c:191
put_nsproxy include/linux/nsproxy.h:105 [inline]
switch_task_namespaces+0xad/0xc0 kernel/nsproxy.c:249
do_exit+0xc0f/0x2b40 kernel/exit.c:831
do_group_exit+0x125/0x310 kernel/exit.c:929
get_signal+0x47d/0x2220 kernel/signal.c:2852
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
irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:313
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0033:0x7f0376332b50
Code: Unable to access opcode bytes at RIP 0x7f0376332b26.
RSP: 002b:00007fff48bb9a40 EFLAGS: 00000216
RAX: 0000001b2d5238a4 RBX: 00007f03760fc008 RCX: 0000001b2d520000
RDX: 0000001b2d5238a8 RSI: 0000000000000000 RDI: 000000000000c6a5
RBP: 0000000000000001 R08: 0000001b2e520000 R09: 0000001b2d521bb4
R10: 0000000000001898 R11: 000000006c5c189c R12: 000000000000c6a5
R13: 00007f037648c000 R14: ffffffff820f7d2d R15: 00007f0376497ff0
----------------
Code disassembly (best guess):
0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
5: 55 push %rbp
6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
b: 48 89 fd mov %rdi,%rbp
e: 48 83 c7 18 add $0x18,%rdi
12: e8 ae 2e 15 f8 callq 0xf8152ec5
17: 48 89 ef mov %rbp,%rdi
1a: e8 f6 a4 15 f8 callq 0xf815a515
1f: e8 51 64 36 f8 callq 0xf8366475
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 16 6f 08 f8 callq 0xf8086f45 <-- trapping instruction
2f: 65 8b 05 2f bd bb 76 mov %gs:0x76bbbd2f(%rip),%eax # 0x76bbbd65
36: 85 c0 test %eax,%eax
38: 74 02 je 0x3c
3a: 5d pop %rbp
3b: c3 retq
3c: e8 .byte 0xe8
3d: 4b 92 rex.WXB xchg %rax,%r10
3f: b9 .byte 0xb9