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WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1049, CPU#1: kworker/u8:0/12
Modules linked in:
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1049
Code: ff ff 48 c7 c7 a0 85 8f 99 be 04 00 00 00 e8 03 8e 7f 00 4c 89 f7 b8 01 00 00 00 87 05 05 f9 e7 17 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 80 6e f4 8d 74 47 48 c7 c0 a0 52 82 8f 48 c1 e8
RSP: 0018:ffffc90000a08d98 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff81a78c8d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8df46e80
RBP: ffffc90000a08f30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff331f0b4 R12: 0000000000002904
R13: 1ffff110170e771a R14: ffffffff8df46e80 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001a2030 CR3: 000000000dd3a000 CR4: 0000000000350ef0
Call Trace:
rcu_core+0x5f5/0x1720 kernel/rcu/tree.c:2852
handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x60/0x150 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+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
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+0xcca/0x1260 kernel/smp.c:877
Code: 89 ee 83 e6 01 31 ff e8 e4 97 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 8f 93 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 73 93 0b 00 eb e4 44
RSP: 0018:ffffc900001176a0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff110170c856d RCX: ffff88801c2a5b80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900001177e0 R08: ffffffff8f822277 R09: 1ffffffff1f0444e
R10: dffffc0000000000 R11: fffffbfff1f0444f R12: ffff8880b8642b68
R13: dffffc0000000000 R14: ffff8880b873bb00 R15: 0000000000000000
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:2711 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2921
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:874
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
----------------
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 e4 97 0b 00 call 0xb97f0
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 8f 93 0b 00 call 0xb93b0
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 73 93 0b 00 call 0xb93b0
3d: eb e4 jmp 0x23
3f: 44 rex.R