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WARNING: CPU: 0 PID: 6318 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 0 PID: 6318 Comm: syz.3.84 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 d4 ed 96 be 04 00 00 00 e8 4a d0 6c 00 48 89 df b8 01 00 00 00 87 05 4c a4 7d 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 51 d3 8c 74 47 48 c7 c0 ec 55 4a 8e 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cd35180 RCX: ffffffff81703046
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cd35180
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2ddba94 R12: 0000000000002904
R13: 1ffff110171c79e2 R14: 0000000000000a02 R15: dffffc0000000000
FS: 00007fa4261f66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c40fed6 CR3: 000000006785f000 CR4: 00000000003506f0
Call Trace:
rcu_core+0x612/0x1720 kernel/rcu/tree.c:2462
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:413
Code: 8a e8 3e fa 15 09 65 66 8b 05 86 22 b2 7e 66 85 c0 75 54 bf 01 00 00 00 e8 67 db 09 00 e8 62 60 3a 00 fb 65 8b 05 52 22 b2 7e <85> c0 75 05 e8 31 08 af ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc900034d7ce0 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000200 RCX: 5d046d1493e53f00
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6f80
RBP: ffffc900034d7d70 R08: ffffffff8e4a212f R09: 1ffffffff1c94425
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: ffffffff8131163a
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200069af9c
handle_signal arch/x86/kernel/signal.c:283 [inline]
arch_do_signal_or_restart+0x48b/0x7b0 arch/x86/kernel/signal.c:312
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa427e4d6e0
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007fa4261f5b38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fa4281e5fa8 RCX: 00007fa427f8f749
RDX: 00007fa4261f5b40 RSI: 00007fa4261f5c70 RDI: 0000000000000011
RBP: 00007fa4281e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa4281e6038 R14: 00007fff8fcc1780 R15: 00007fff8fcc1868
----------------
Code disassembly (best guess):
0: 8a e8 mov %al,%ch
2: 3e fa ds cli
4: 15 09 65 66 8b adc $0x8b666509,%eax
9: 05 86 22 b2 7e add $0x7eb22286,%eax
e: 66 85 c0 test %ax,%ax
11: 75 54 jne 0x67
13: bf 01 00 00 00 mov $0x1,%edi
18: e8 67 db 09 00 call 0x9db84
1d: e8 62 60 3a 00 call 0x3a6084
22: fb sti
23: 65 8b 05 52 22 b2 7e mov %gs:0x7eb22252(%rip),%eax # 0x7eb2227c
* 2a: 85 c0 test %eax,%eax <-- trapping instruction
2c: 75 05 jne 0x33
2e: e8 31 08 af ff call 0xffaf0864
33: 48 c7 04 24 0e 36 e0 movq $0x45e0360e,(%rsp)
3a: 45
3b: 4b rex.WXB
3c: c7 .byte 0xc7
3d: 04 37 add $0x37,%al