------------[ cut here ]------------
WARNING: CPU: 0 PID: 8962 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 0 UID: 0 PID: 8962 Comm: syz.5.818 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 20 54 b0 99 be 04 00 00 00 e8 93 35 7c 00 4c 89 f7 b8 01 00 00 00 87 05 55 4d 09 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 f4 13 8e 74 47 48 c7 c0 60 d7 a3 8f 48 c1 e8
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a706bd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e13f400
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3360a84 R12: 0000000000002904
R13: 1ffff110170c75f2 R14: ffffffff8e13f400 R15: dffffc0000000000
FS: 0000555565aa4500(0000) GS:ffff888125c13000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31e0cff8 CR3: 0000000079874000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 e5 5e
RSP: 0018:ffffc900038cf8a0 EFLAGS: 00000293
RAX: ffffffff81b4601b RBX: 1ffff110170e7f61 RCX: ffff88807b128000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900038cfa20 R08: ffffffff8fa3a637 R09: 1ffffffff1f474c6
R10: dffffc0000000000 R11: fffffbfff1f474c7 R12: ffff8880b873fb08
R13: dffffc0000000000 R14: ffff8880b863b1c0 R15: 0000000000000001
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2653 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2863
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240
static_key_disable+0x1a/0x20 kernel/jump_label.c:248
tracepoint_remove_func kernel/tracepoint.c:370 [inline]
tracepoint_probe_unregister+0x80e/0x9b0 kernel/tracepoint.c:504
trace_event_reg+0x153/0x270 kernel/trace/trace_events.c:-1
perf_trace_event_unreg+0xb6/0x1b0 kernel/trace/trace_event_perf.c:162
perf_trace_destroy+0xa4/0x150 kernel/trace/trace_event_perf.c:241
__free_event+0x343/0x7e0 kernel/events/core.c:5613
put_event kernel/events/core.c:5756 [inline]
perf_event_release_kernel+0x45b/0x510 kernel/events/core.c:5866
perf_release+0x38/0x50 kernel/events/core.c:5876
__fput+0x44c/0xa70 fs/file_table.c:468
task_work_run+0x1d1/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb180f8eba9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff807fc8b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb1811d7da0 RCX: 00007fb180f8eba9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb1811d7da0 R08: 0000000000000000 R09: 0000001e807fcbaf
R10: 00007fb1811d7cb0 R11: 0000000000000246 R12: 000000000003cf89
R13: 00007fb1811d6180 R14: ffffffffffffffff R15: 00007fff807fc9d0
----------------
Code disassembly (best guess):
0: 45 8b 2c 24 mov (%r12),%r13d
4: 44 89 ee mov %r13d,%esi
7: 83 e6 01 and $0x1,%esi
a: 31 ff xor %edi,%edi
c: e8 56 63 0b 00 call 0xb6367
11: 41 83 e5 01 and $0x1,%r13d
15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
1c: fc ff df
1f: 75 07 jne 0x28
21: e8 01 5f 0b 00 call 0xb5f27
26: eb 38 jmp 0x60
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 11 jne 0x44
33: 41 f7 04 24 01 00 00 testl $0x1,(%r12)
3a: 00
3b: 74 1e je 0x5b
3d: e8 .byte 0xe8
3e: e5 5e in $0x5e,%eax