watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [kworker/0:3:14461] Modules linked in: irq event stamp: 566041 hardirqs last enabled at (566039): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (566041): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (566038): [] spin_unlock_bh include/linux/spinlock.h:407 [inline] softirqs last enabled at (566038): [] neigh_periodic_work+0xc23/0xe40 net/core/neighbour.c:1035 softirqs last disabled at (566040): [] spin_lock_bh include/linux/spinlock.h:353 [inline] softirqs last disabled at (566040): [] neigh_periodic_work+0xc43/0xe40 net/core/neighbour.c:1037 CPU: 0 UID: 0 PID: 14461 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: events_power_efficient neigh_periodic_work RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947 Code: ff ff ff e8 70 bc 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 02 27 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d b7 33 da RSP: 0018:ffffc900050e7a08 EFLAGS: 00000282 RAX: cd01a56bc1a83000 RBX: 0000000000000001 RCX: 8000000000000201 RDX: 00000000e73a526e RSI: ffffffff8e69f5c6 RDI: ffffffff8c6dad80 RBP: ffff888078f5be80 R08: ffffffff89b86bb3 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff20f4c50 R12: ffffffff90385658 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff888124cc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a89f2bda30 CR3: 000000000eb48000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:182 [inline] _raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:205 spin_lock_bh include/linux/spinlock.h:353 [inline] neigh_periodic_work+0xc43/0xe40 net/core/neighbour.c:1037 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 15346 Comm: kworker/u8:15 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline] RIP: 0010:csd_lock kernel/smp.c:396 [inline] RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:944 Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 01 59 0c 00 41 83 e7 01 75 07 e8 f6 53 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:ffffc900048fe120 EFLAGS: 00000293 RAX: ffffffff81bbbb7e RBX: ffff8880b8643708 RCX: ffff88802d9a8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900048fe270 R08: ffff88802d9a959f R09: 1ffff11005b352b3 R10: dffffc0000000000 R11: ffffffff8179fc60 R12: 1ffff110170c86e1 R13: 0000000000000000 R14: ffff8880b8643700 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124dc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000009 CR3: 000000004a4b0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 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+0x8ff/0x1090 arch/x86/mm/tlb.c:1435 flush_tlb_page arch/x86/include/asm/tlbflush.h:352 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:104 page_vma_mkclean_one+0x4b9/0x840 mm/rmap.c:1146 page_mkclean_one+0x20c/0x2e0 mm/rmap.c:1194 __rmap_walk_file+0x4cd/0x6a0 mm/rmap.c:3120 rmap_walk mm/rmap.c:3164 [inline] folio_mkclean+0x2d5/0x3f0 mm/rmap.c:1226 folio_clear_dirty_for_io+0x190/0x820 mm/page-writeback.c:2903 mpage_submit_folio+0x83/0x2a0 fs/ext4/inode.c:2075 mpage_process_page_bufs+0x6bd/0x8a0 fs/ext4/inode.c:2201 mpage_prepare_extent_to_map+0xf92/0x1890 fs/ext4/inode.c:2743 ext4_do_writepages+0xb8a/0x4770 fs/ext4/inode.c:2884 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3032 do_writepages+0x338/0x560 mm/page-writeback.c:2560 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1803 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2114 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2190 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2301 wb_check_old_data_flush fs/fs-writeback.c:2405 [inline] wb_do_writeback fs/fs-writeback.c:2484 [inline] wb_workfn+0xc92/0x10f0 fs/fs-writeback.c:2512 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245