rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=30b/1/0x4000000000000000 softirq=59360/59362 fqs=5247
(t=10502 jiffies g=83361 q=2284)
NMI backtrace for cpu 1
CPU: 1 PID: 19385 Comm: syz-executor.3 Not tainted 5.18.0-rc3-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+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x236/0x3a0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:639 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:723 [inline]
rcu_pending kernel/rcu/tree.c:3923 [inline]
rcu_sched_clock_irq+0xf1b/0x18d0 kernel/rcu/tree.c:2625
update_process_times+0x197/0x200 kernel/time/timer.c:1788
tick_sched_handle kernel/time/tick-sched.c:243 [inline]
tick_sched_timer+0x377/0x540 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:__mnt_want_write+0xd2/0x2a0 fs/namespace.c:348
Code: 00 00 45 8b 3e bd 00 02 00 00 be 00 02 00 00 44 21 fe 31 ff e8 1f f4 98 ff 44 21 fd 75 0a e8 f5 ef 98 ff eb 3a 0f 1f 00 f3 90 <42> 0f b6 04 2b 84 c0 75 10 41 f7 06 00 02 00 00 74 1e e8 d7 ef 98
RSP: 0018:ffffc9000ac4fda8 EFLAGS: 00000246
RAX: ffffffff81eccb39 RBX: 1ffff1100ef991b6 RCX: 0000000000040000
RDX: ffffc9000aa0b000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000000200 R08: ffffffff81eccb11 R09: fffffbfff1bc082e
R10: fffffbfff1bc082e R11: 1ffffffff1bc082d R12: ffff888077cc8da0
R13: dffffc0000000000 R14: ffff888077cc8db0 R15: 0000000000000220
mnt_want_write+0x43/0x80 fs/namespace.c:394
path_setxattr+0x117/0x2b0 fs/xattr.c:593
__do_sys_setxattr fs/xattr.c:611 [inline]
__se_sys_setxattr fs/xattr.c:607 [inline]
__x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:607
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fd430a890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd431c22168 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fd430b9c030 RCX: 00007fd430a890e9
RDX: 0000000020000280 RSI: 0000000020000240 RDI: 0000000020000200
RBP: 00007fd430ae308d R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffdcc09b3f R14: 00007fd431c22300 R15: 0000000000022000
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 45 8b 3e mov (%r14),%r15d
5: bd 00 02 00 00 mov $0x200,%ebp
a: be 00 02 00 00 mov $0x200,%esi
f: 44 21 fe and %r15d,%esi
12: 31 ff xor %edi,%edi
14: e8 1f f4 98 ff callq 0xff98f438
19: 44 21 fd and %r15d,%ebp
1c: 75 0a jne 0x28
1e: e8 f5 ef 98 ff callq 0xff98f018
23: eb 3a jmp 0x5f
25: 0f 1f 00 nopl (%rax)
28: f3 90 pause
* 2a: 42 0f b6 04 2b movzbl (%rbx,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 75 10 jne 0x43
33: 41 f7 06 00 02 00 00 testl $0x200,(%r14)
3a: 74 1e je 0x5a
3c: e8 .byte 0xe8
3d: d7 xlat %ds:(%rbx)
3e: ef out %eax,(%dx)
3f: 98 cwtl