watchdog: BUG: soft lockup - CPU#1 stuck for 225s! [syz.2.4302:19047] Modules linked in: irq event stamp: 1028364 hardirqs last enabled at (1028363): [] irqentry_exit+0x1dd/0x8c0 kernel/entry/common.c:219 hardirqs last disabled at (1028364): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (1028362): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (1028362): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (1028362): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 softirqs last disabled at (1028331): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (1028331): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (1028331): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 19047 Comm: syz.2.4302 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xdfd/0x15e0 kernel/smp.c:877 Code: 57 48 8b 54 24 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 65 5b 0c 00 f3 90 <41> 0f b6 45 00 40 38 c5 7c 08 84 c0 0f 85 b6 05 00 00 8b 43 08 31 RSP: 0018:ffffc90010e17808 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8443020 RCX: ffffffff81b27861 RDX: ffff88802ec1bd00 RSI: ffffffff81b2783b RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: ffff88802ec1c830 R12: dffffc0000000000 R13: ffffed1017088605 R14: 0000000000000001 R15: 0000000000000000 FS: 000055558e622500(0000) GS:ffff8881249fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d421ff8 CR3: 000000007e4fe000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 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+0x27b/0xdb0 arch/x86/kernel/alternative.c:2921 __static_call_transform+0x368/0x770 arch/x86/kernel/static_call.c:119 arch_static_call_transform+0xb6/0xc0 arch/x86/kernel/static_call.c:172 __static_call_update+0xef/0x640 kernel/static_call_inline.c:147 tracepoint_update_call kernel/tracepoint.c:271 [inline] tracepoint_remove_func kernel/tracepoint.c:394 [inline] tracepoint_probe_unregister+0xb10/0xd70 kernel/tracepoint.c:504 bpf_raw_tp_link_release+0x35/0x70 kernel/bpf/syscall.c:3768 bpf_link_free+0xec/0x390 kernel/bpf/syscall.c:3279 bpf_link_put_direct kernel/bpf/syscall.c:3322 [inline] bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3329 __fput+0x402/0xb70 fs/file_table.c:468 task_work_run+0x150/0x240 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xfb/0x540 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f721158f749 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:00007ffcc8e90238 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f72117e7da0 RCX: 00007f721158f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f72117e7da0 R08: 0000000000002624 R09: 00000019c8e9052f R10: 00007f72117e7cb0 R11: 0000000000000246 R12: 00000000000c2be8 R13: 00007ffcc8e90330 R14: ffffffffffffffff R15: 00007ffcc8e90350 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline] RIP: 0010:mm_get_cid kernel/sched/sched.h:3759 [inline] RIP: 0010:mm_cid_from_cpu kernel/sched/sched.h:3820 [inline] RIP: 0010:mm_cid_schedin kernel/sched/sched.h:3870 [inline] RIP: 0010:mm_cid_switch_to kernel/sched/sched.h:3886 [inline] RIP: 0010:context_switch kernel/sched/core.c:5245 [inline] RIP: 0010:__schedule+0x5f0d/0x6150 kernel/sched/core.c:6863 Code: ff ff ff 89 c8 48 89 d9 4c 89 fb 41 89 c7 e9 84 00 00 00 4d 89 e5 49 89 cf 41 83 e5 07 41 83 c5 03 f3 90 48 8b 85 60 ff ff ff <0f> b6 00 41 38 c5 7c 08 84 c0 0f 85 97 00 00 00 8b 35 e1 0a 60 02 RSP: 0018:ffffc90000147c20 EFLAGS: 00000046 RAX: fffffbfff1baecce RBX: ffff8880b843adc0 RCX: 0000000000000002 RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff8880779eb050 RBP: ffffc90000147d70 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: ffff88801d2f4830 R12: ffffffff8dd76674 R13: 0000000000000007 R14: ffff8880779eb050 R15: ffff8880779ea4c0 FS: 0000000000000000(0000) GS:ffff8881248fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c33e82f CR3: 000000007e681000 CR4: 0000000000350ef0 Call Trace: __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6960 smpboot_thread_fn+0x8e6/0xae0 kernel/smpboot.c:156 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246