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WARNING: kernel/rcu/tree_stall.h:1048 at rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1048, CPU#1: kworker/u8:9/5905
Modules linked in:
CPU: 1 UID: 0 PID: 5905 Comm: kworker/u8:9 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1048
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 80 15 73 9b e8 c0 18 8c 00 b8 01 00 00 00 87 05 35 d2 84 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 64 73 22 91 48 81 fd c0 14 bf 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000a08df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81ee4340
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9b731580
RBP: ffffffff8ebf14c0 R08: 0000000000000001 R09: fffffbfff36e62b0
R10: 0000000000000003 R11: 0000000000000000 R12: 1ffffffff1d01e50
R13: 0000000000000246 R14: 0000000000000200 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888123ee8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002b000 CR3: 000000000e992000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000404
DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1011 [inline]
rcu_core+0x2cb/0x10d0 kernel/rcu/tree.c:2892
handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:get_current arch/x86/include/asm/current.h:23 [inline]
RIP: 0010:write_comp_data+0x10/0x90 kernel/kcov.c:245
Code: 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 8b 05 d9 aa 59 12 49 89 f8 49 89 f1 49 89 d2 <65> 48 8b 3d b0 aa 59 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00
RSP: 0018:ffffc90005617870 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81fd46fd
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff8880b8443680 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170886d1 R14: 0000000000000001 R15: ffff8880b853c880
csd_lock_wait kernel/smp.c:342 [inline]
smp_call_function_many_cond+0x5ad/0x16c0 kernel/smp.c:892
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057
on_each_cpu include/linux/smp.h:72 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2773 [inline]
smp_text_poke_batch_finish+0x337/0xc60 arch/x86/kernel/alternative.c:2983
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x37a/0x550 kernel/jump_label.c:910
static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate mm/kfence/core.c:911 [inline]
toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:903
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
----------------
Code disassembly (best guess):
0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
7: 00
8: 66 90 xchg %ax,%ax
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 65 8b 05 d9 aa 59 12 mov %gs:0x1259aad9(%rip),%eax # 0x1259aafa
21: 49 89 f8 mov %rdi,%r8
24: 49 89 f1 mov %rsi,%r9
27: 49 89 d2 mov %rdx,%r10
* 2a: 65 48 8b 3d b0 aa 59 mov %gs:0x1259aab0(%rip),%rdi # 0x1259aae2 <-- trapping instruction
31: 12
32: a9 00 01 ff 00 test $0xff0100,%eax
37: 74 1b je 0x54
39: f6 c4 01 test $0x1,%ah
3c: 74 07 je 0x45
3e: a9 .byte 0xa9