INFO: task syz-executor:3066 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:D stack:0 pid:3066 tgid:3066 ppid:1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:6026 [inline] __schedule+0x1399/0x1fa0 kernel/sched/core.c:7880 __schedule_loop kernel/sched/core.c:7961 [inline] schedule+0xc5/0x240 kernel/sched/core.c:7976 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8033 __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+0x8c0/0xa60 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+0x68d/0x700 net/socket.c:2216 __do_sys_sendto net/socket.c:2228 [inline] __se_sys_sendto net/socket.c:2224 [inline] __x64_sys_sendto+0xe9/0x100 net/socket.c:2224 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: 0033:0x7f4123357f57 RSP: 002b:00007ffd2447c460 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000555557894500 RCX: 00007f4123357f57 RDX: 0000000000000028 RSI: 00007f4124144670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007ffd2447c4c4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f4124144670 R15: 0000000000000000 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 f1e96da778e106ed2ad9fef94b5d954a2cba2451 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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+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: 203 Comm: sshd Not tainted syzkaller #0 f1e96da778e106ed2ad9fef94b5d954a2cba2451 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:__kernel_text_address+0x2c/0x40 kernel/extable.c:92 Code: 1f 00 55 48 89 e5 53 48 89 fb e8 3f 00 00 00 48 81 fb 00 a0 f6 87 0f 93 c1 48 81 fb 25 0b 09 88 0f 92 c2 20 ca 08 c2 0f b6 c2 <5b> 5d e9 0d 03 52 04 cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 00 RSP: 0018:ffffc90000006bc8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff8487433e RCX: 0000000000006c00 RDX: ffffc90000007901 RSI: 1ffff92000000d82 RDI: ffffffff8487433e RBP: ffffc90000006bd0 R08: ffffc90000006cd0 R09: ffffc90000006cc8 R10: 000000000000000b R11: ffffffff8175e9a0 R12: ffff888120c12600 R13: 1ffff11024182580 R14: dffffc0000000000 R15: 1ffff92000000d8a FS: 00007f2e9c97b300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557ddee21af8 CR3: 0000000120b6e000 CR4: 00000000003526b0 DR0: 000a000000000000 DR1: ffffffffff7fff00 DR2: 4000000000010022 DR3: fffffffffffffff6 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_frame.c:19 arch_stack_walk+0x10a/0x170 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 save_stack+0x125/0x240 mm/page_owner.c:174 __set_page_owner+0x8e/0x600 mm/page_owner.c:338 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1863 prep_new_page+0x2d/0x190 mm/page_alloc.c:1871 get_page_from_freelist+0x496e/0x4a20 mm/page_alloc.c:3948 __alloc_pages_noprof+0x35f/0x7e0 mm/page_alloc.c:5312 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1 allocate_slab+0x69/0x420 mm/slub.c:2687 new_slab mm/slub.c:2741 [inline] ___slab_alloc+0x5a2/0x8d0 mm/slub.c:3934 __slab_alloc mm/slub.c:4025 [inline] __slab_alloc_node mm/slub.c:4078 [inline] slab_alloc_node mm/slub.c:4239 [inline] kmem_cache_alloc_noprof+0x290/0x410 mm/slub.c:4260 skb_clone+0x229/0x460 net/core/skbuff.c:2082 deliver_clone net/bridge/br_forward.c:125 [inline] maybe_deliver net/bridge/br_forward.c:191 [inline] br_flood+0x4ed/0x730 net/bridge/br_forward.c:237 br_handle_frame_finish+0x11eb/0x17a0 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+0xfae/0x3ab0 net/core/dev.c:5683 __netif_receive_skb_one_core net/core/dev.c:5787 [inline] __netif_receive_skb net/core/dev.c:5902 [inline] process_backlog+0x3e5/0xad0 net/core/dev.c:6238 __napi_poll+0xd0/0x610 net/core/dev.c:6889 napi_poll net/core/dev.c:6958 [inline] net_rx_action+0x5ea/0xd80 net/core/dev.c:7080 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 local_bh_enable include/linux/bottom_half.h:33 [inline] fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline] fpu__clear_user_states+0x190/0x2a0 arch/x86/kernel/fpu/core.c:800 handle_signal arch/x86/kernel/signal.c:310 [inline] arch_do_signal_or_restart+0x411/0x760 arch/x86/kernel/signal.c:339 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x57/0xb0 kernel/entry/common.c:218 do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x55a45d554c70 Code: ff ff ff 0f 1f 80 00 00 00 00 c7 05 0a 9e 07 00 01 00 00 00 c3 0f 1f 44 00 00 89 3d fa 9d 07 00 31 ff c3 0f 1f 80 00 00 00 00 05 ee 9d 07 00 01 00 00 00 c3 0f 1f 44 00 00 8b 05 ea 9d 07 00 RSP: 002b:00007ffd56853038 EFLAGS: 00000202 ORIG_RAX: 000000000000010f RAX: 0000000000000000 RBX: 00007f2e9c97b300 RCX: 00007f2e9c2a7407 RDX: 00007ffd56853040 RSI: 00007ffd56853170 RDI: 0000000000000011 RBP: 0000000000000002 R08: 0000000000000008 R09: 0000000000000000 R10: 00007ffd568538c0 R11: 0000000000000202 R12: 0000000000000064 R13: 0000000000000000 R14: 000055a45d599004 R15: 0000000000000002 net_ratelimit: 130233 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:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:7a:d5:6e:f2:49:72, 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:7a:d5:6e:f2:49:72, 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, 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:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)