watchdog: BUG: soft lockup - CPU#1 stuck for 122s! [syz.8.73:6572] Modules linked in: irq event stamp: 9020727 hardirqs last enabled at (9020726): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (9020727): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (9013090): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (9013090): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (9013090): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (9013093): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (9013093): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (9013093): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 6572 Comm: syz.8.73 Not tainted 6.16.0-rc3-syzkaller-gea2aecdf7a95 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:rcu_read_unlock_special+0x87/0x4c0 kernel/rcu/tree_plugin.h:694 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 a2 95 f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90000a089a0 EFLAGS: 00000206 RAX: 067f748cf78a4000 RBX: 1ffff9200014113c RCX: 067f748cf78a4000 RDX: 0000000000000002 RSI: ffffffff8d99947e RDI: ffffffff8be2a340 RBP: ffffc90000a08aa0 R08: ffffffff8fa1f1f7 R09: 1ffffffff1f43e3e R10: dffffc0000000000 R11: fffffbfff1f43e3f R12: ffffffff8e144200 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002 FS: 00007f6b59f646c0(0000) GS:ffff888125d19000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f86c81f5f98 CR3: 00000000342fc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:873 [inline] hsr_announce+0x2ff/0x360 net/hsr/hsr_device.c:420 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:generic_exec_single+0x481/0x500 kernel/smp.c:447 Code: 75 11 e8 02 90 0b 00 48 85 db 75 16 e8 f8 8f 0b 00 eb 15 e8 f1 8f 0b 00 e8 cc 34 bb 09 48 85 db 74 ea e8 e2 8f 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c RSP: 0018:ffffc9000497f9c0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000 RDX: ffffc9001c265000 RSI: 000000000001664f RDI: 0000000000016650 RBP: ffffc9000497fa90 R08: ffffffff8fa1f1f7 R09: 1ffffffff1f43e3e R10: dffffc0000000000 R11: fffffbfff1f43e3f R12: 1ffff9200092ff3c R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200092ff5d smp_call_function_single+0x351/0x590 kernel/smp.c:676 task_function_call kernel/events/core.c:121 [inline] perf_install_in_context+0x593/0x8f0 kernel/events/core.c:3101 __do_sys_perf_event_open kernel/events/core.c:13691 [inline] __se_sys_perf_event_open+0x193a/0x1d70 kernel/events/core.c:13333 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6b5918e929 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:00007f6b59f64038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f6b593b5fa0 RCX: 00007f6b5918e929 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100 RBP: 00007f6b59210b39 R08: 0000000000000009 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6b593b5fa0 R15: 00007fffb72c0b28 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6228 Comm: kworker/u8:10 Not tainted 6.16.0-rc3-syzkaller-gea2aecdf7a95 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x31/0x70 kernel/kcov.c:217 Code: 24 65 48 8b 0c 25 08 70 a0 92 65 8b 15 28 0c e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c <8b> 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 RSP: 0018:ffffc9000b447698 EFLAGS: 00000246 RAX: ffffffff81b4e920 RBX: ffff8880b863b200 RCX: ffff888025b5da00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000b447800 R08: ffffffff8fa1f1f7 R09: 1ffffffff1f43e3e R10: dffffc0000000000 R11: fffffbfff1f43e3f R12: 1ffff110170e7f65 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b873fb28 FS: 0000000000000000(0000) GS:ffff888125c19000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1f75e4145a CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:340 [inline] smp_call_function_many_cond+0xf80/0x12d0 kernel/smp.c:885 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2691 [inline] smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2901 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245