INFO: task syz.1.800:3090 blocked for more than 125 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.800 state:D stack:0 pid:3090 tgid:3090 ppid:290 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5996 [inline] __schedule+0x134f/0x1ea0 kernel/sched/core.c:7843 __schedule_loop kernel/sched/core.c:7924 [inline] schedule+0xc5/0x240 kernel/sched/core.c:7939 request_wait_answer fs/fuse/dev.c:477 [inline] __fuse_request_send fs/fuse/dev.c:493 [inline] __fuse_simple_request+0xdee/0x1b10 fs/fuse/dev.c:588 fuse_simple_request fs/fuse/fuse_i.h:1248 [inline] fuse_flush+0xad9/0x2020 fs/fuse/file.c:602 filp_flush fs/open.c:1552 [inline] filp_close+0xc0/0x160 fs/open.c:1565 __range_close fs/file.c:710 [inline] __close_range+0x529/0x6e0 fs/file.c:767 __do_sys_close_range fs/open.c:1618 [inline] __se_sys_close_range fs/open.c:1615 [inline] __x64_sys_close_range+0x7e/0x90 fs/open.c:1615 x64_sys_call+0x1686/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:437 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fb30bf9c629 RSP: 002b:00007ffee91965d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: ffffffffffffffda RBX: 00007fb30c217da0 RCX: 00007fb30bf9c629 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fb30c217da0 R08: 0000000000000006 R09: 0000000000000000 R10: 00007fb30c217cb0 R11: 0000000000000246 R12: 00000000000223cf R13: 00007fb30c21618c R14: 000000000002216f R15: 00007fb30c216180 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 f3a946831d5e2592ee08d6703df2b13566dbc460 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120 dump_stack+0x19/0x20 lib/dump_stack.c:129 nmi_cpu_backtrace+0x2ba/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+0xdad/0xf00 kernel/hung_task.c:423 kthread+0x2c9/0x370 kernel/kthread.c:389 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 1397 Comm: kworker/u8:30 Not tainted syzkaller #0 f3a946831d5e2592ee08d6703df2b13566dbc460 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: netns cleanup_net RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:313 Code: 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 5d e9 d4 70 19 04 cc 0f 1f 00 b8 eb e3 0c cb 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 48 8b 45 08 65 48 8b 15 cc 4a 7d 7e 65 8b RSP: 0018:ffffc9000022fa10 EFLAGS: 00000292 RAX: 00000000fffffffd RBX: 0000000000000000 RCX: ffff88810eb8cc00 RDX: 0000000000000100 RSI: 00000000fffffffd RDI: 00000000ffffffff RBP: ffffc9000022fad0 R08: ffffc9000022fd60 R09: ffffc9000022fd70 R10: ffffc9000022fed0 R11: fffff52000045fde R12: 0000000000000001 R13: 1ffff11021bea518 R14: 0000000000000003 R15: 00000000fffffffd FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5366947e20 CR3: 00000001291f2000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000001113 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __find_rr_leaf+0x24e/0x840 net/ipv6/route.c:869 find_rr_leaf net/ipv6/route.c:890 [inline] rt6_select net/ipv6/route.c:934 [inline] fib6_table_lookup+0x2ee/0x9e0 net/ipv6/route.c:2241 ip6_pol_route+0x17a/0x1360 net/ipv6/route.c:2277 ip6_pol_route_input+0x5a/0x80 net/ipv6/route.c:2334 pol_lookup_func include/net/ip6_fib.h:626 [inline] __fib6_rule_action net/ipv6/fib6_rules.c:234 [inline] fib6_rule_action+0x9e7/0xbe0 net/ipv6/fib6_rules.c:272 fib_rules_lookup+0x4b4/0xa50 net/core/fib_rules.c:320 fib6_rule_lookup+0x189/0x6d0 net/ipv6/fib6_rules.c:109 ip6_route_input_lookup net/ipv6/route.c:2346 [inline] ip6_route_input+0x62e/0x8f0 net/ipv6/route.c:2642 ip6_rcv_finish_core net/ipv6/ip6_input.c:66 [inline] ip6_rcv_finish+0x15a/0x3e0 net/ipv6/ip6_input.c:77 NF_HOOK include/linux/netfilter.h:317 [inline] ipv6_rcv+0xf1/0x240 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core net/core/dev.c:5776 [inline] __netif_receive_skb net/core/dev.c:5889 [inline] netif_receive_skb_internal net/core/dev.c:5975 [inline] netif_receive_skb+0x147/0x7b0 net/core/dev.c:6034 br_netif_receive_skb net/bridge/br_input.c:30 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] br_pass_frame_up+0x126/0x1b0 net/bridge/br_input.c:70 br_handle_frame_finish+0x1317/0x1760 net/bridge/br_input.c:221 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+0xfae/0x3ab0 net/core/dev.c:5670 __netif_receive_skb_one_core net/core/dev.c:5774 [inline] __netif_receive_skb net/core/dev.c:5889 [inline] process_backlog+0x3e5/0xad0 net/core/dev.c:6225 __napi_poll+0xd0/0x610 net/core/dev.c:6876 napi_poll net/core/dev.c:6945 [inline] net_rx_action+0x5ea/0xd80 net/core/dev.c:7067 handle_softirqs+0x1aa/0x630 kernel/softirq.c:621 __do_softirq+0xf/0x16 kernel/softirq.c:659 do_softirq+0xb8/0x110 kernel/softirq.c:503 __local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x54/0x60 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] addrconf_ifdown+0x614/0x1980 net/ipv6/addrconf.c:3950 addrconf_notify+0x17a/0xea0 net/ipv6/addrconf.c:-1 notifier_call_chain+0x10e/0x2b0 kernel/notifier.c:93 raw_notifier_call_chain+0x31/0x40 kernel/notifier.c:461 call_netdevice_notifiers_info net/core/dev.c:2074 [inline] call_netdevice_notifiers_extack net/core/dev.c:2112 [inline] call_netdevice_notifiers net/core/dev.c:2126 [inline] unregister_netdevice_many_notify+0xe3f/0x1c30 net/core/dev.c:11508 unregister_netdevice_many+0x1d/0x30 net/core/dev.c:11570 cleanup_net+0x643/0xc90 net/core/net_namespace.c:637 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3319 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400 kthread+0x2c9/0x370 kernel/kthread.c:389 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 net_ratelimit: 103000 callbacks suppressed bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ca:c8:14:dd:8d:22, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ca:c8:14:dd:8d:22, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ca:c8:14:dd:8d:22, vlan:0)