watchdog: BUG: soft lockup - CPU#0 stuck for 25s! [udevd:4338] Modules linked in: irq event stamp: 3276428 hardirqs last enabled at (3276427): [] __raw_read_unlock_irqrestore include/linux/rwlock_api_smp.h:265 [inline] hardirqs last enabled at (3276427): [] _raw_read_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:303 hardirqs last disabled at (3276428): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (3276428): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (3276424): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (3276422): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (3276422): [] __alloc_skb+0x1a8/0x610 net/core/skbuff.c:697 CPU: 0 UID: 0 PID: 4338 Comm: udevd Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_acquire+0x17c/0x370 arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_acquire+0x15c/0x370 kernel/locking/lockdep.c:5911 sp : ffff80009a417500 x29: ffff80009a417550 x28: 0000000000000000 x27: ffff0000d2938000 x26: ffff800088ba22f8 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: ffff800088efc9a0 x21: ffff800080af569c x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 4e56454400393d52 x14: 4f4e494d00373d52 x13: 0000000000000097 x12: 0000000000040000 x11: 000000009491e5c4 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800080af569c x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000008 x1 : ffff0000d2938000 x0 : 0000000000000000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_acquire+0x17c/0x370 kernel/locking/lockdep.c:5912 (P) fs_reclaim_acquire+0xb8/0x110 mm/page_alloc.c:4392 might_alloc include/linux/sched/mm.h:316 [inline] slab_pre_alloc_hook mm/slub.c:4636 [inline] slab_alloc_node mm/slub.c:4974 [inline] kmem_cache_alloc_noprof+0x60/0x5d4 mm/slub.c:5010 skb_clone+0x1ac/0x320 net/core/skbuff.c:2119 do_one_broadcast net/netlink/af_netlink.c:1456 [inline] netlink_broadcast_filtered+0x520/0xd58 net/netlink/af_netlink.c:1539 netlink_broadcast+0x50/0x68 net/netlink/af_netlink.c:1563 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline] kobject_uevent_net_broadcast+0x33c/0x53c lib/kobject_uevent.c:410 kobject_uevent_env+0x518/0x944 lib/kobject_uevent.c:611 kobject_synth_uevent+0x25c/0x730 lib/kobject_uevent.c:207 uevent_store+0x34/0x84 drivers/base/core.c:2847 dev_attr_store+0x6c/0x90 drivers/base/core.c:2509 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] NMI backtrace for cpu 1 skipped: idling at arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle_call+0xd0/0xfc kernel/sched/idle.c:129