INFO: task syz.6.4619:14702 blocked for more than 122 seconds. Not tainted 6.12.38-syzkaller-g209015b548fb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.4619 state:D stack:0 pid:14702 tgid:14701 ppid:10784 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5945 [inline] __schedule+0x1322/0x1df0 kernel/sched/core.c:7791 __schedule_loop kernel/sched/core.c:7872 [inline] schedule+0xc6/0x240 kernel/sched/core.c:7887 super_lock+0x150/0x300 fs/super.c:115 super_lock_shared fs/super.c:140 [inline] iterate_supers+0x8a/0x560 fs/super.c:934 quota_sync_all fs/quota/quota.c:69 [inline] __do_sys_quotactl fs/quota/quota.c:938 [inline] __se_sys_quotactl+0x308/0x7d0 fs/quota/quota.c:917 __x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917 x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7ff3f598ebe9 RSP: 002b:00007ff3f6885038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007ff3f5bb5fa0 RCX: 00007ff3f598ebe9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100 RBP: 00007ff3f5a11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff3f5bb6038 R14: 00007ff3f5bb5fa0 R15: 00007ffd66674938 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-g209015b548fb #0 c4bb26c31dabe4a25adff9e3720090d1cd174d38 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120 dump_stack+0x19/0x20 lib/dump_stack.c:129 nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline] watchdog+0xd8f/0xed0 kernel/hung_task.c:423 kthread+0x2ca/0x370 kernel/kthread.c:389 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 62 Comm: kworker/0:2 Not tainted 6.12.38-syzkaller-g209015b548fb #0 c4bb26c31dabe4a25adff9e3720090d1cd174d38 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: events_power_efficient neigh_periodic_work RIP: 0010:unwind_next_frame+0x5/0x750 arch/x86/kernel/unwind_frame.c:265 Code: e1 07 80 c1 03 38 c1 7c 96 48 89 df e8 d4 e7 97 00 eb 8c 66 90 b8 43 bc ad 85 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 48 48 89 fb 48 ba 00 RSP: 0018:ffffc90000006a58 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc90000006b20 RCX: 0000000000006a00 RDX: dffffc0000000000 RSI: ffffffff84fa6c0e RDI: ffffc90000006a68 RBP: ffffc90000006af0 R08: ffffc90000006b30 R09: ffffc90000006b28 R10: 000000000000000c R11: ffffffff81742a80 R12: ffff8881016e2600 R13: 0000000000000000 R14: ffffffff81742a80 R15: ffffc90000006a68 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe377ae86ec CR3: 00000000072a8000 CR4: 00000000003526b0 Call Trace: stack_trace_save+0x9d/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4a/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4666 [inline] kmem_cache_free+0x1c1/0x510 mm/slub.c:4773 kfree_skbmem net/core/skbuff.c:-1 [inline] __kfree_skb+0x18f/0x210 net/core/skbuff.c:1203 sk_skb_reason_drop+0xd8/0x310 net/core/skbuff.c:1240 tpacket_rcv+0x2313/0x3a10 net/packet/af_packet.c:2549 dev_queue_xmit_nit+0xa40/0xae0 net/core/dev.c:2418 xmit_one net/core/dev.c:3655 [inline] dev_hard_start_xmit+0x187/0x770 net/core/dev.c:3678 __dev_queue_xmit+0x19cc/0x3790 net/core/dev.c:4514 dev_queue_xmit include/linux/netdevice.h:3141 [inline] br_dev_queue_push_xmit+0x553/0x6d0 net/bridge/br_forward.c:53 NF_HOOK include/linux/netfilter.h:317 [inline] br_forward_finish net/bridge/br_forward.c:66 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] __br_forward+0x25c/0x390 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] br_flood+0x67e/0x730 net/bridge/br_forward.c:245 br_handle_frame_finish+0x12bb/0x1720 net/bridge/br_input.c:215 nf_hook_bridge_pre net/bridge/br_input.c:301 [inline] br_handle_frame+0x5a6/0xba0 net/bridge/br_input.c:424 __netif_receive_skb_core+0xf48/0x3940 net/core/dev.c:5651 __netif_receive_skb_one_core net/core/dev.c:5755 [inline] __netif_receive_skb net/core/dev.c:5870 [inline] process_backlog+0x3e5/0xae0 net/core/dev.c:6206 __napi_poll+0xd0/0x610 net/core/dev.c:6857 napi_poll net/core/dev.c:6926 [inline] net_rx_action+0x584/0xce0 net/core/dev.c:7048 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621 __do_softirq+0xf/0x16 kernel/softirq.c:659 do_softirq+0xa6/0x100 kernel/softirq.c:503 __local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430 __raw_write_unlock_bh include/linux/rwlock_api_smp.h:281 [inline] _raw_write_unlock_bh+0x33/0x70 kernel/locking/spinlock.c:366 neigh_periodic_work+0xa73/0xbc0 net/core/neighbour.c:1019 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x7d2/0x1020 kernel/workqueue.c:3319 worker_thread+0xc58/0x1250 kernel/workqueue.c:3400 kthread+0x2ca/0x370 kernel/kthread.c:389 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 net_ratelimit: 82916 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) net_ratelimit: 139986 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c2:83:1a:c8:79:a9, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)