GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog watchdog: BUG: soft lockup - CPU#0 stuck for 154s! [napi/wg1-0:5762] Modules linked in: irq event stamp: 15213 hardirqs last enabled at (15212): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (15213): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (8116): [] napi_threaded_poll_loop+0x139/0x990 net/core/dev.c:-1 softirqs last disabled at (8121): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last disabled at (8121): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last disabled at (8121): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 CPU: 0 UID: 0 PID: 5762 Comm: napi/wg1-0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:perf_swevent_get_recursion_context+0x5/0x100 kernel/events/core.c:11209 Code: e1 07 fe c1 38 c1 7c 87 48 89 df e8 55 ee 37 00 e9 7a ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 54 53 49 bf 00 00 00 00 00 fc ff df e8 05 63 c0 ff RSP: 0018:ffffc900000076b0 EFLAGS: 00000287 RAX: ffffffff81d38218 RBX: 000000000000002c RCX: 0000000000000100 RDX: ffff888013c93e80 RSI: 000000000000002c RDI: 0000000000002000 RBP: ffffc900000077e8 R08: 0000000000000100 R09: 0000000000000000 R10: ffffc900000078e0 R11: ffffffffa0401310 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffc90000007760 R15: ffffc90000007780 FS: 0000000000000000(0000) GS:ffff888123410000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe1b293b368 CR3: 000000000ff48000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000008d24 DR2: 0000000000008d24 DR3: 0000000000008d24 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_buf_alloc+0x43/0x280 kernel/trace/trace_event_perf.c:410 do_perf_trace_lock include/trace/events/lock.h:49 [inline] perf_trace_lock+0x1a1/0x410 include/trace/events/lock.h:49 __do_trace_lock_release include/trace/events/lock.h:68 [inline] trace_lock_release include/trace/events/lock.h:68 [inline] lock_release+0x396/0x3c0 kernel/locking/lockdep.c:5954 rcu_lock_release include/linux/rcupdate.h:319 [inline] rcu_read_unlock include/linux/rcupdate.h:880 [inline] trace_call_bpf+0x7c4/0xb80 kernel/trace/bpf_trace.c:149 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11524 do_perf_trace_lock include/trace/events/lock.h:49 [inline] perf_trace_lock+0x32e/0x410 include/trace/events/lock.h:49 __do_trace_lock_release include/trace/events/lock.h:68 [inline] trace_lock_release include/trace/events/lock.h:68 [inline] lock_release+0x396/0x3c0 kernel/locking/lockdep.c:5954 rcu_lock_release include/linux/rcupdate.h:319 [inline] rcu_read_unlock include/linux/rcupdate.h:880 [inline] ndisc_alloc_skb+0x37b/0x480 net/ipv6/ndisc.c:436 ndisc_send_rs+0x288/0x6b0 net/ipv6/ndisc.c:708 addrconf_rs_timer+0x2d2/0x6c0 net/ipv6/addrconf.c:4098 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1749 expire_timers kernel/time/timer.c:1800 [inline] __run_timers kernel/time/timer.c:2375 [inline] __run_timer_base+0x652/0x8b0 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:finish_task_switch+0x413/0xc60 kernel/sched/core.c:5434 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 67 8b 70 0a e8 92 89 3a 00 fb 4c 8b 65 c8 <49> 8d bc 24 18 17 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900049dfaa0 EFLAGS: 00000206 RAX: 0000000000001fb7 RBX: ffff8880b823d3a0 RCX: 8000000000000001 RDX: 0000000000000000 RSI: ffffffff8e6a96ae RDI: ffffffff8c8ead80 RBP: ffffc900049dfaf0 R08: ffffffff91bdecbf R09: 1ffffffff237bd97 R10: dffffc0000000000 R11: fffffbfff237bd98 R12: ffff888013c93e80 R13: ffff8880b823d368 R14: dffffc0000000000 R15: 1ffff11017047a74 context_switch kernel/sched/core.c:5586 [inline] __schedule+0x17e5/0x5830 kernel/sched/core.c:7382 __schedule_loop kernel/sched/core.c:7459 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7474 napi_thread_wait net/core/dev.c:8060 [inline] napi_threaded_poll+0x17f/0x4a0 net/core/dev.c:8128 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: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline] RIP: 0010:smp_call_function_many_cond+0x1132/0x1500 kernel/smp.c:1028 Code: 78 44 8b 2b 44 89 ee 83 e6 01 31 ff e8 17 6f 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f2 69 0c 00 eb 35 f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 d8 69 0c 00 RSP: 0018:ffffc90000126120 EFLAGS: 00000293 RAX: ffffffff81bcb248 RBX: ffff8880b82442a8 RCX: ffff88801eeb5dc0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000126270 R08: ffff888077c417c7 R09: 1ffff1100ef882f8 R10: dffffc0000000000 R11: ffffffff817a65a0 R12: 1ffff11017048855 R13: dffffc0000000000 R14: 1ffff11003dd6e6b R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888123510000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe24b5da08 CR3: 0000000076b5c000 CR4: 00000000003526f0 DR0: 00002000000001c0 DR1: 0000000000008d24 DR2: 0000000000008d24 DR3: 0000000000008d24 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+0x910/0x10b0 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:116 page_vma_mkclean_one+0x4b4/0x830 mm/rmap.c:1144 page_mkclean_one+0x20c/0x2e0 mm/rmap.c:1192 __rmap_walk_file+0x4c8/0x6a0 mm/rmap.c:3106 rmap_walk mm/rmap.c:3150 [inline] folio_mkclean+0x2d5/0x3f0 mm/rmap.c:1224 folio_clear_dirty_for_io+0x190/0x820 mm/page-writeback.c:2903 mpage_submit_folio+0x83/0x2a0 fs/ext4/inode.c:2201 mpage_process_page_bufs+0x6bd/0x8a0 fs/ext4/inode.c:2327 mpage_prepare_extent_to_map+0xf8d/0x1880 fs/ext4/inode.c:2875 ext4_do_writepages+0xc08/0x44a0 fs/ext4/inode.c:3023 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3171 do_writepages+0x338/0x560 mm/page-writeback.c:2560 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1809 writeback_sb_inodes+0x9de/0x1af0 fs/fs-writeback.c:2120 __writeback_inodes_wb+0x114/0x250 fs/fs-writeback.c:2196 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2307 wb_check_old_data_flush fs/fs-writeback.c:2411 [inline] wb_do_writeback fs/fs-writeback.c:2490 [inline] wb_workfn+0xc92/0x10f0 fs/fs-writeback.c:2518 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 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