------------[ cut here ]------------
WARNING: CPU: 0 PID: 18520 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: 18520 Comm: syz.7.3624 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 60 94 7d 99 be 04 00 00 00 e8 33 d7 7e 00 4c 89 f7 b8 01 00 00 00 87 05 c5 af d6 17 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 26 f4 8d 74 47 48 c7 c0 90 04 7d 8f 48 c1 e8
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a6e48d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8df42600
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff32fb28c R12: 0000000000002904
R13: 1ffff11017107602 R14: ffffffff8df42600 R15: dffffc0000000000
FS: 00007fcc86fbd6c0(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc863e7dac CR3: 0000000049240000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
handle_softirqs+0x286/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd38/0x12d0 kernel/smp.c:877
Code: 89 ee 83 e6 01 31 ff e8 b6 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 6f 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 45 6f 0b 00 eb e4 44
RSP: 0018:ffffc9000bc17420 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff11017127ffd RCX: 0000000000080000
RDX: ffffc9000bdb9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000bc175a0 R08: ffffffff8f7cd477 R09: 1ffffffff1ef9a8e
R10: dffffc0000000000 R11: fffffbfff1ef9a8f R12: ffff8880b893ffe8
R13: dffffc0000000000 R14: ffff8880b883b240 R15: 0000000000000001
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2923
__static_call_transform+0x4eb/0x750 arch/x86/kernel/static_call.c:111
arch_static_call_transform+0x98/0xc0 arch/x86/kernel/static_call.c:-1
__static_call_update+0xe4/0x5d0 kernel/static_call_inline.c:147
tracepoint_update_call kernel/tracepoint.c:271 [inline]
tracepoint_add_func+0x91e/0xa10 kernel/tracepoint.c:312
tracepoint_probe_register_prio kernel/tracepoint.c:464 [inline]
tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:484
perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
perf_trace_event_init+0x4e1/0x9d0 kernel/trace/trace_event_perf.c:202
perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226
perf_tp_event_init+0x8d/0x120 kernel/events/core.c:10872
perf_try_init_event+0x17f/0x870 kernel/events/core.c:12605
perf_init_event kernel/events/core.c:12703 [inline]
perf_event_alloc+0x133e/0x2be0 kernel/events/core.c:12978
__do_sys_perf_event_open kernel/events/core.c:13496 [inline]
__se_sys_perf_event_open+0x772/0x1d70 kernel/events/core.c:13377
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcc8618efc9
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:00007fcc86fbd038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fcc863e5fa0 RCX: 00007fcc8618efc9
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007fcc86211f91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcc863e6038 R14: 00007fcc863e5fa0 R15: 00007ffd7fc27328
----------------
Code disassembly (best guess):
0: 89 ee mov %ebp,%esi
2: 83 e6 01 and $0x1,%esi
5: 31 ff xor %edi,%edi
7: e8 b6 73 0b 00 call 0xb73c2
c: 41 83 e5 01 and $0x1,%r13d
10: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
17: fc ff df
1a: 75 07 jne 0x23
1c: e8 61 6f 0b 00 call 0xb6f82
21: eb 38 jmp 0x5b
23: f3 90 pause
25: 42 0f b6 04 2b movzbl (%rbx,%r13,1),%eax
* 2a: 84 c0 test %al,%al <-- trapping instruction
2c: 75 11 jne 0x3f
2e: 41 f7 04 24 01 00 00 testl $0x1,(%r12)
35: 00
36: 74 1e je 0x56
38: e8 45 6f 0b 00 call 0xb6f82
3d: eb e4 jmp 0x23
3f: 44 rex.R