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WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049, CPU#0: syz.3.3565/19657
Modules linked in:
CPU: 0 UID: 0 PID: 19657 Comm: syz.3.3565 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 c0 52 c2 9a e8 b0 3c 85 00 b8 01 00 00 00 87 05 65 c4 1e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 74 ee 88 90 48 81 fd 80 46 3d 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a38e50
RDX: fffffbfff3584a58 RSI: 0000000000000004 RDI: ffffffff9ac252c0
RBP: ffffffff8e3d4680 R08: 0000000000000001 R09: fffffbfff3584a58
R10: 0000000000000003 R11: ffff88802eb08b30 R12: 1ffffffff1c02250
R13: 0000000000000246 R14: ffffffff8e3d4680 R15: ffff8880b843bc52
FS: 00007f600c0d06c0(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2175036380 CR3: 00000000632ee000 CR4: 00000000003526f0
Call Trace:
rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1012 [inline]
rcu_core+0x4cf/0x15f0 kernel/rcu/tree.c:2852
handle_softirqs+0x219/0x950 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:313
Code: 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 58 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 2a fe ff ff
RSP: 0018:ffffc9000bbffeb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9001d7da000
RDX: 1ffff11005d61006 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088bdd7 R11: 0000000000000000 R12: 00000000000000ca
R13: ffffc9000bbfff48 R14: 0000000000000000 R15: 0000000000000000
__secure_computing+0x86/0x3b0 kernel/seccomp.c:1393
syscall_trace_enter+0x89/0x220 kernel/entry/syscall-common.c:44
syscall_enter_from_user_mode_work include/linux/entry-common.h:78 [inline]
syscall_enter_from_user_mode include/linux/entry-common.h:109 [inline]
do_syscall_64+0x42b/0xf80 arch/x86/entry/syscall_64.c:90
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f600b18f749
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:00007f600c0d00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f600b3e6098 RCX: 00007f600b18f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f600b3e6098
RBP: 00007f600b3e6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f600b3e6128 R14: 00007fff25c02ac0 R15: 00007fff25c02ba8
----------------
Code disassembly (best guess):
0: 0c 24 or $0x24,%al
2: 0f b7 d6 movzwl %si,%edx
5: 0f b7 f7 movzwl %di,%esi
8: bf 03 00 00 00 mov $0x3,%edi
d: e9 58 fe ff ff jmp 0xfffffe6a
12: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
19: 00
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: 90 nop
25: 90 nop
26: 90 nop
27: 90 nop
28: 90 nop
29: 90 nop
* 2a: f3 0f 1e fa endbr64 <-- trapping instruction
2e: 48 8b 0c 24 mov (%rsp),%rcx
32: 89 f2 mov %esi,%edx
34: 89 fe mov %edi,%esi
36: bf 05 00 00 00 mov $0x5,%edi
3b: e9 2a fe ff ff jmp 0xfffffe6a