INFO: task syz.1.872:3212 blocked for more than 122 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.872 state:D stack:0 pid:3212 tgid:3210 ppid:292 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:6016 [inline] __schedule+0x134f/0x1ea0 kernel/sched/core.c:7864 __schedule_loop kernel/sched/core.c:7945 [inline] schedule+0xc5/0x240 kernel/sched/core.c:7960 schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common+0x369/0x650 kernel/sched/completion.c:127 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148 rcu_barrier+0x415/0x540 kernel/rcu/tree.c:4657 flush_rcu_work+0x71/0x90 kernel/workqueue.c:4292 kvfree_rcu_barrier+0x23c/0x2f0 kernel/rcu/tree.c:3955 kmem_cache_destroy+0x32/0x170 mm/slab_common.c:490 p9_client_destroy+0x436/0x480 net/9p/client.c:1088 v9fs_session_close+0x52/0x1d0 fs/9p/v9fs.c:506 v9fs_kill_super+0x60/0x90 fs/9p/vfs_super.c:196 deactivate_locked_super+0xd5/0x2a0 fs/super.c:478 v9fs_mount+0x76c/0x9f0 fs/9p/vfs_super.c:177 legacy_get_tree+0x106/0x1b0 fs/fs_context.c:662 vfs_get_tree+0x9e/0x290 fs/super.c:1820 do_new_mount+0x251/0xb30 fs/namespace.c:3557 path_mount+0x682/0x1010 fs/namespace.c:3884 do_mount fs/namespace.c:3897 [inline] __do_sys_mount fs/namespace.c:4107 [inline] __se_sys_mount+0x2bf/0x480 fs/namespace.c:4084 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4084 x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166 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: 0033:0x7fec5659c799 RSP: 002b:00007fec57370028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fec56816090 RCX: 00007fec5659c799 RDX: 0000200000004500 RSI: 00002000000000c0 RDI: 0000000000000000 RBP: 00007fec56632c99 R08: 0000200000000200 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fec56816128 R14: 00007fec56816090 R15: 00007ffdc031f228 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 1aa8ac0f99ca3a11aee7c3a781bea815a9b193fa 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+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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 281 Comm: sshd-session Not tainted syzkaller #0 1aa8ac0f99ca3a11aee7c3a781bea815a9b193fa Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__update_page_owner_handle+0xcf/0x370 mm/page_owner.c:262 Code: c4 44 89 ee e8 82 97 a1 ff 45 39 e5 0f 84 5c 02 00 00 4c 8b 2d d2 23 86 05 4a 8d 7c 2b 08 48 89 f8 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 9e 01 00 00 49 01 dd 8b 45 d0 41 89 45 08 4c 89 e8 48 RSP: 0018:ffffc9000022f838 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff8881094fa980 RCX: 0000000000000100 RDX: ffff88810f64a600 RSI: 0000000000000001 RDI: ffff8881094fa990 RBP: ffffc9000022f898 R08: 00000000ffffffff R09: 0000003f2a793228 R10: ffff88810f64ae50 R11: ffffffff8175d5f0 R12: 0000000000000000 R13: 0000000000000008 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f3ce4341300(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffbb66b0bd0 CR3: 000000010c250000 CR4: 00000000003526b0 Call Trace: __set_page_owner+0x128/0x600 mm/page_owner.c:343 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook+0x3b8/0x3f0 mm/page_alloc.c:1864 prep_new_page+0x20/0x120 mm/page_alloc.c:1872 get_page_from_freelist+0x496e/0x4a20 mm/page_alloc.c:3948 __alloc_pages_noprof+0x35f/0x7e0 mm/page_alloc.c:5298 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 dst_alloc+0x13c/0x250 net/core/dst.c:89 rt_dst_alloc net/ipv4/route.c:1647 [inline] ip_route_input_slow net/ipv4/route.c:2385 [inline] ip_route_input_rcu+0x1a0e/0x2700 net/ipv4/route.c:2499 ip_route_input_noref+0xd4/0x150 net/ipv4/route.c:2510 arp_process+0x908/0x1790 net/ipv4/arp.c:841 NF_HOOK+0x17e/0x1e0 include/linux/netfilter.h:317 arp_rcv+0x2f8/0x490 net/ipv4/arp.c:992 __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+0x22a/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+0xd3/0x610 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+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 __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] release_sock+0x171/0x1f0 net/core/sock.c:3689 tcp_recvmsg+0x21b/0x8d0 net/ipv4/tcp.c:2872 inet_recvmsg+0x13f/0x4f0 net/ipv4/af_inet.c:890 sock_recvmsg_nosec net/socket.c:1052 [inline] sock_recvmsg+0x190/0x270 net/socket.c:1074 sock_read_iter+0x252/0x320 net/socket.c:1144 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x657/0xcb0 fs/read_write.c:570 ksys_read+0x145/0x260 fs/read_write.c:713 __do_sys_read fs/read_write.c:723 [inline] __se_sys_read fs/read_write.c:721 [inline] __x64_sys_read+0x7f/0x90 fs/read_write.c:721 x64_sys_call+0x2638/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:1 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: 0033:0x7f3ce3c77407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffc9cdebca0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f3ce4341300 RCX: 00007f3ce3c77407 RDX: 0000000000040000 RSI: 00007f3ce3b2c010 RDI: 0000000000000004 RBP: 00007ffc9cdebd50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000004 R14: 0000564f73673200 R15: 0000000000000004 net_ratelimit: 187798 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 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:0c, 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: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:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:96:7e:63:cf:5a:84, 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 bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) net_ratelimit: 210712 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 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: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:0c, 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 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: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: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:96:7e:63:cf:5a:84, vlan:0)