watchdog: BUG: soft lockup - CPU#0 stuck for 172s! [udevd:5001] Modules linked in: irq event stamp: 899899 hardirqs last enabled at (899898): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:219 [inline] hardirqs last enabled at (899898): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:229 hardirqs last disabled at (899899): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (878736): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (878736): [] __alloc_skb+0x18d/0x7a0 net/core/skbuff.c:698 softirqs last disabled at (878777): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last disabled at (878777): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last disabled at (878777): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 CPU: 0 UID: 0 PID: 5001 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:220 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:229 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0a de 9d f5 48 89 df e8 c2 55 9e f5 e8 fd f6 ca f5 fb bf 01 00 00 00 f2 49 8f f5 65 48 8b 05 3a 61 da 08 48 85 c0 74 07 5b e9 7f 4a RSP: 0018:ffffc90000007d90 EFLAGS: 00000206 RAX: 00000000000dbb3a RBX: ffff8880b8226480 RCX: 0000000000000102 RDX: 0000000000000002 RSI: ffffffff8e6a6798 RDI: 0000000000000001 RBP: ffffc90000007f08 R08: ffffffff91bdd6bf R09: 1ffffffff237bad7 R10: dffffc0000000000 R11: fffffbfff237bad8 R12: ffff8880b8226480 R13: 1ffff92000000fcc R14: ffff88803555a7d0 R15: ffffc90000007e60 FS: 00007f0f417a5880(0000) GS:ffff888123413000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffc6c8e778 CR3: 000000007e316000 CR4: 00000000003526f0 Call Trace: expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2375 [inline] __run_timer_base+0x642/0x8b0 kernel/time/timer.c:2387 run_timer_base kernel/time/timer.c:2396 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2406 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x16/0xb0 kernel/rcu/tree.c:753 Code: 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 48 ff 05 2f 5c 33 13 e8 2a 50 56 0a <89> c3 83 f8 08 73 66 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 RSP: 0018:ffffc90002fa7840 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 8000000000000001 RDX: ffff88807e3a3e80 RSI: ffffffff8c8e9e60 RDI: ffffffff8c8e9e20 RBP: ffffc90002fa7960 R08: ffffffff91bdd6bf R09: 1ffffffff237bad7 R10: dffffc0000000000 R11: fffffbfff237bad8 R12: dffffc0000000000 R13: ffff8880329d7ba0 R14: 0000000000000000 R15: 00000000179b5940 trace_ctime_ns_xchg include/trace/events/timestamp.h:52 [inline] inode_set_ctime_current+0x749/0xb60 fs/inode.c:2928 shmem_mknod+0x270/0x340 mm/shmem.c:4049 lookup_open+0xedc/0x1970 fs/namei.c:4569 open_last_lookups fs/namei.c:4768 [inline] path_openat+0x70c/0x20f0 fs/namei.c:5007 do_file_open+0x23e/0x4a0 fs/namei.c:5039 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1464 [inline] __se_sys_openat fs/open.c:1459 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1459 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0f410a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fffc6c96bf0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0f417a5880 RCX: 00007f0f410a7407 RDX: 0000000000080141 RSI: 00005627d4a8102e RDI: ffffffffffffff9c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001a4 R11: 0000000000000202 R12: 00000000ffffffff R13: 00000000ffffffff R14: ffffffffffffffff R15: 0000000000000000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5296 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline] RIP: 0010:csd_lock kernel/smp.c:422 [inline] RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:970 Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 51 7a 0c 00 41 83 e7 01 75 07 e8 36 75 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01 RSP: 0018:ffffc90002f97420 EFLAGS: 00000293 RAX: ffffffff81bca0ee RBX: ffff8880b8244028 RCX: ffff888028fe0000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002f97570 R08: ffff888028fe159f R09: 1ffff110051fc2b3 R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff11017048805 R13: 0000000000000000 R14: ffff8880b8244020 R15: 0000000000000001 FS: 00007fbb47bce780(0000) GS:ffff888123513000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f5d96d9168 CR3: 0000000077a9c000 CR4: 00000000003526f0 Call Trace: __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x910/0x10b0 arch/x86/mm/tlb.c:1435 dup_mmap+0x17dd/0x1e10 mm/mmap.c:1884 dup_mm kernel/fork.c:1542 [inline] copy_mm+0x115/0x470 kernel/fork.c:1594 copy_process+0x1ecc/0x44b0 kernel/fork.c:2320 kernel_clone+0x2d7/0x940 kernel/fork.c:2784 __do_sys_clone kernel/fork.c:2926 [inline] __se_sys_clone kernel/fork.c:2910 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2910 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbb47ca2636 Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffce56a90b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffce56a90b8 RCX: 00007fbb47ca2636 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffce56c9600 R08: 0000000000000000 R09: 0000000000000001 R10: 00007fbb47bcea50 R11: 0000000000000246 R12: 00007ffce56a91f0 R13: 0000000000000000 R14: 0000000000000000 R15: 000055f5c88a7ac0