INFO: task syz-executor:5632 blocked for more than 122 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:5632 tgid:5632 ppid:1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5996 [inline] __schedule+0x134a/0x1dd0 kernel/sched/core.c:7842 __schedule_loop kernel/sched/core.c:7923 [inline] schedule+0xc5/0x240 kernel/sched/core.c:7938 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7995 __mutex_lock_common kernel/locking/mutex.c:707 [inline] __mutex_lock+0x960/0x1bb0 kernel/locking/mutex.c:803 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6672 netlink_rcv_skb+0x256/0x4f0 net/netlink/af_netlink.c:2545 rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6693 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x8c3/0xa60 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x7fe/0xb10 net/netlink/af_netlink.c:1889 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x718/0x790 net/socket.c:2217 __do_sys_sendto net/socket.c:2229 [inline] __se_sys_sendto net/socket.c:2225 [inline] __x64_sys_sendto+0xe9/0x100 net/socket.c:2225 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45 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: 0033:0x7fbae65560d7 RSP: 002b:00007ffd144c0ec0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00005555927c6500 RCX: 00007fbae65560d7 RDX: 000000000000002c RSI: 00007fbae7344670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007ffd144c0f24 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007fbae7344670 R15: 0000000000000000 INFO: task syz-executor:5643 blocked for more than 123 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:R running task stack:0 pid:5643 tgid:5643 ppid:1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5996 [inline] __schedule+0x134a/0x1dd0 kernel/sched/core.c:7842 preempt_schedule_irq+0xab/0x110 kernel/sched/core.c:8168 raw_irqentry_exit_cond_resched+0x32/0x40 kernel/entry/common.c:311 irqentry_exit+0x4a/0x60 kernel/entry/common.c:354 sysvec_reschedule_ipi+0x72/0x80 arch/x86/kernel/smp.c:248 asm_sysvec_reschedule_ipi+0x1f/0x30 arch/x86/include/asm/idtentry.h:707 RIP: 0010:page_expected_state mm/page_alloc.c:1018 [inline] RIP: 0010:free_page_is_bad mm/page_alloc.c:1063 [inline] RIP: 0010:free_pages_prepare mm/page_alloc.c:1343 [inline] RIP: 0010:free_unref_page+0xa58/0xf80 mm/page_alloc.c:2842 Code: 85 1c 05 00 00 48 8b 44 24 08 48 63 58 34 4c 09 eb 4c 8d 78 38 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ff e8 de 07 07 00 49 0b 1f 48 b8 00 00 00 00 00 fc ff RSP: 0018:ffffc900010af4a0 EFLAGS: 00000246 RAX: 1ffffd4000b8ce0f RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea0005c67074 RBP: ffffc900010af588 R08: ffffea0005c67077 R09: 1ffffd4000b8ce0e R10: dffffc0000000000 R11: fffff94000b8ce0f R12: ffffea0005c67048 R13: 0000000000000000 R14: 1ffff92000215e9c R15: ffffea0005c67078 __free_pages+0x6b/0x3b0 mm/page_alloc.c:5351 __free_slab+0xb5/0x110 mm/slub.c:2758 free_slab+0x18/0xe0 mm/slub.c:2781 discard_slab mm/slub.c:2787 [inline] __put_partials+0x11b/0x150 mm/slub.c:3256 put_cpu_partial+0x91/0xc0 mm/slub.c:3331 __slab_free+0x1cf/0x2a0 mm/slub.c:4584 do_slab_free mm/slub.c:4666 [inline] ___cache_free+0xc9/0xe0 mm/slub.c:4777 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0xb5/0x130 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x180 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x28/0x90 mm/kasan/common.c:331 kasan_slab_alloc include/linux/kasan.h:251 [inline] slab_post_alloc_hook mm/slub.c:4202 [inline] slab_alloc_node mm/slub.c:4251 [inline] kmem_cache_alloc_node_noprof+0x1ca/0x420 mm/slub.c:4305 __alloc_skb+0x108/0x370 net/core/skbuff.c:677 alloc_skb include/linux/skbuff.h:1331 [inline] nlmsg_new include/net/netlink.h:1015 [inline] netlink_ack+0x155/0xa50 net/netlink/af_netlink.c:2482 netlink_rcv_skb+0x2dd/0x4f0 net/netlink/af_netlink.c:2551 rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6693 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x8c3/0xa60 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x7fe/0xb10 net/netlink/af_netlink.c:1889 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x718/0x790 net/socket.c:2217 __do_sys_sendto net/socket.c:2229 [inline] __se_sys_sendto net/socket.c:2225 [inline] __x64_sys_sendto+0xe9/0x100 net/socket.c:2225 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45 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: 0033:0x7efc475560d7 RSP: 002b:00007ffc1c946770 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00005555642ba500 RCX: 00007efc475560d7 RDX: 0000000000000028 RSI: 00007efc48344670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007ffc1c9467d4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007efc48344670 R15: 0000000000000000 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 5d18be0d7d8d5053dc4a903978481071267b1302 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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+0x2c6/0x370 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: 33 Comm: rcuop/1 Not tainted syzkaller #0 5d18be0d7d8d5053dc4a903978481071267b1302 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x5/0x90 kernel/kcov.c:313 Code: 10 48 89 74 11 18 48 89 44 11 20 5d c3 cc cc cc cc cc 0f 1f 00 b8 62 26 04 14 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <48> 89 e5 48 8b 45 08 65 48 8b 15 ec 5e 7d 7e 65 8b 0d ed 5e 7d 7e RSP: 0018:ffffc90000007148 EFLAGS: 00000246 RAX: 000000000000000a RBX: 0000000000000002 RCX: ffff88810367df00 RDX: 0000000000000100 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc900000071e8 R08: ffffc90000007540 R09: ffffc90000007550 R10: ffffc900000076b0 R11: fffff52000000eda R12: dffffc0000000000 R13: ffff88811e759cc0 R14: 0000000000000002 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555562e16888 CR3: 000000016aa92000 CR4: 00000000003526b0 Call Trace: find_match+0x176/0x10e0 net/ipv6/route.c:786 __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_lookup+0x4ee/0x6d0 net/ipv6/fib6_rules.c:117 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:5763 [inline] __netif_receive_skb net/core/dev.c:5876 [inline] process_backlog+0x44b/0xad0 net/core/dev.c:6212 __napi_poll+0xd0/0x610 net/core/dev.c:6863 napi_poll net/core/dev.c:6932 [inline] net_rx_action+0x5ea/0xd80 net/core/dev.c:7054 handle_softirqs+0x1ad/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 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_do_batch+0x5d9/0xd40 kernel/rcu/tree.c:2594 nocb_cb_wait kernel/rcu/tree_nocb.h:923 [inline] rcu_nocb_cb_kthread+0x524/0xb30 kernel/rcu/tree_nocb.h:957 kthread+0x2c6/0x370 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: 161050 callbacks suppressed +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) net_ratelimit: 199024 callbacks suppressed +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:86:47:ba:e9:3a:98, vlan:0) +$<ś: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)