------------[ cut here ]------------
WARNING: CPU: 0 PID: 20110 at kernel/rcu/tree_stall.h:937 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:929
Modules linked in:
CPU: 0 PID: 20110 Comm: syz.2.4243 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:937
Code: ff ff ff 48 c7 c7 20 9c 10 96 be 04 00 00 00 e8 5a 06 58 00 48 89 df b8 01 00 00 00 87 05 9c 6c ac 14 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff c0 0b 12 8c 74 47 48 c7 c0 c4 d0 69 8d 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8c120bc0 RCX: ffffffff81642f76
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8c120bc0
RBP: ffffc90000007e10 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff2c21384 R11: 1ffffffff2c21384 R12: 0000000000002904
R13: ffffffff8c120bc0 R14: 0000000000000a02 R15: dffffc0000000000
FS: 00007fa25f9166c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000007ced0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
rcu_core+0x5ef/0x15d0 kernel/rcu/tree.c:2758
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f6 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 de 9e a9 f7 48 89 df e8 a6 73 aa f7 e8 41 0d cb f7 fb bf 01 00 00 00 <e8> 76 95 9e f7 65 8b 05 07 93 4f 76 85 c0 74 02 5b c3 e8 b4 9d 4d
RSP: 0018:ffffc9000340fbc0 EFLAGS: 00000282
RAX: c9ed3deba7cf7400 RBX: ffff888078374a00 RCX: c9ed3deba7cf7400
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: 0000000000000001
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100f06e941
R10: ffffed100f06e941 R11: 1ffff1100f06e940 R12: ffff888078374a00
R13: 0000000000000021 R14: dffffc0000000000 R15: 000000001c000004
spin_unlock_irq include/linux/spinlock.h:414 [inline]
get_signal+0x11d6/0x12c0 kernel/signal.c:2903
arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa2616aefc7
Code: ff ff 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
RSP: 002b:00007fa25f916038 EFLAGS: 00000246
RAX: 0000000000000113 RBX: 00007fa261905fa0 RCX: 00007fa2616aefc9
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fa261731f91 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa261906038 R14: 00007fa261905fa0 R15: 00007ffe1d1ceee8
</TASK>
----------------
Code disassembly (best guess):
0: f6 ff idiv %bh
2: 0f 1f 00 nopl (%rax)
5: 53 push %rbx
6: 48 89 fb mov %rdi,%rbx
9: 48 83 c7 18 add $0x18,%rdi
d: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
12: e8 de 9e a9 f7 call 0xf7a99ef5
17: 48 89 df mov %rbx,%rdi
1a: e8 a6 73 aa f7 call 0xf7aa73c5
1f: e8 41 0d cb f7 call 0xf7cb0d65
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 76 95 9e f7 call 0xf79e95a5 <-- trapping instruction
2f: 65 8b 05 07 93 4f 76 mov %gs:0x764f9307(%rip),%eax # 0x764f933d
36: 85 c0 test %eax,%eax
38: 74 02 je 0x3c
3a: 5b pop %rbx
3b: c3 ret
3c: e8 .byte 0xe8
3d: b4 9d mov $0x9d,%ah
3f: 4d rex.WRB