watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [kworker/u4:4:1072] Modules linked in: irq event stamp: 191816 hardirqs last enabled at (191815): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 hardirqs last disabled at (191816): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1097 softirqs last enabled at (166722): [] rcu_read_unlock_bh include/linux/rcupdate.h:753 [inline] softirqs last enabled at (166722): [] mod_peer_timer drivers/net/wireguard/timers.c:38 [inline] softirqs last enabled at (166722): [] wg_timers_handshake_initiated+0x1ab/0x300 drivers/net/wireguard/timers.c:184 softirqs last disabled at (166718): [] wg_timers_handshake_initiated+0x48/0x300 drivers/net/wireguard/timers.c:185 CPU: 0 PID: 1072 Comm: kworker/u4:4 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline] RIP: 0010:smp_call_function_many_cond+0x452/0xc20 kernel/smp.c:969 Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 10 48 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 33 06 00 00 8b 43 08 31 RSP: 0018:ffffc90004dbf9f8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9d367c0 RCX: 0000000000000000 RDX: ffff88801bfb5580 RSI: ffffffff816b9d80 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff816b9da6 R11: 0000000000000000 R12: ffffed10173a6cf9 R13: 0000000000000001 R14: ffff8880b9d367c8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555557a12c0 CR3: 000000000b68e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:929 [inline] text_poke_bp_batch+0x1b3/0x560 arch/x86/kernel/alternative.c:1114 text_poke_flush arch/x86/kernel/alternative.c:1268 [inline] text_poke_flush arch/x86/kernel/alternative.c:1265 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:626 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:618 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 0b 00 or (%rax),%eax 2: 85 ed test %ebp,%ebp 4: 74 4d je 0x53 6: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax d: fc ff df 10: 4d 89 f4 mov %r14,%r12 13: 4c 89 f5 mov %r14,%rbp 16: 49 c1 ec 03 shr $0x3,%r12 1a: 83 e5 07 and $0x7,%ebp 1d: 49 01 c4 add %rax,%r12 20: 83 c5 03 add $0x3,%ebp 23: e8 10 48 0b 00 callq 0xb4838 28: f3 90 pause * 2a: 41 0f b6 04 24 movzbl (%r12),%eax <-- trapping instruction 2f: 40 38 c5 cmp %al,%bpl 32: 7c 08 jl 0x3c 34: 84 c0 test %al,%al 36: 0f 85 33 06 00 00 jne 0x66f 3c: 8b 43 08 mov 0x8(%rbx),%eax 3f: 31 .byte 0x31