INFO: task syz.2.55:604 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.55        state:D stack:0     pid:604   tgid:603   ppid:477    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0xdb5/0x17a0 kernel/sched/core.c:6723
 __schedule_loop kernel/sched/core.c:6800 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:6815
 schedule_timeout+0xb2/0x300 kernel/time/timer.c:2592
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x359/0x630 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 __flush_work+0x56f/0x6e0 kernel/workqueue.c:4221
 __cancel_work_sync kernel/workqueue.c:4341 [inline]
 cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4378
 p9_conn_destroy net/9p/trans_fd.c:915 [inline]
 p9_fd_close+0x252/0x450 net/9p/trans_fd.c:950
 p9_client_create+0xa8f/0x1140 net/9p/client.c:1060
 v9fs_session_init+0x1e1/0x1810 fs/9p/v9fs.c:410
 v9fs_mount+0x128/0x9f0 fs/9p/vfs_super.c:122
 legacy_get_tree+0x103/0x1b0 fs/fs_context.c:662
 vfs_get_tree+0x9e/0x290 fs/super.c:1814
 do_new_mount+0x24d/0xa10 fs/namespace.c:3528
 path_mount+0x686/0xfe0 fs/namespace.c:3855
 do_mount fs/namespace.c:3868 [inline]
 __do_sys_mount fs/namespace.c:4078 [inline]
 __se_sys_mount+0x306/0x3f0 fs/namespace.c:4055
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4055
 x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
 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: 0033:0x7fb83ef8ec29
RSP: 002b:00007fb83fd82038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb83f1d5fa0 RCX: 00007fb83ef8ec29
RDX: 0000200000000400 RSI: 00002000000003c0 RDI: 0000000000000000
RBP: 00007fb83f011e41 R08: 0000200000000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb83f1d6038 R14: 00007fb83f1d5fa0 R15: 00007ffe3f782ed8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 501b473c6716377e6219430a4c28a6473a25f206
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __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:223 [inline]
 watchdog+0xbd4/0xc20 kernel/hung_task.c:379
 kthread+0x2ca/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 501b473c6716377e6219430a4c28a6473a25f206
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 e7 f4 f4 80 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 a2 47 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 c3 f6 05 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff86c07da0 EFLAGS: 000002c2
RAX: ffff8881f6e00000 RBX: ffffffff86c15540 RCX: ffffffff853fae8e
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 000000000011b13c
RBP: ffffffff86c07da0 R08: ffff8881f6e39633 R09: 1ffff1103edc72c6
R10: dffffc0000000000 R11: ffffed103edc72c7 R12: 1ffffffff0d82aa8
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff876371e8
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5a68a7df98 CR3: 000000011fffc000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:753
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:790
 default_idle_call+0x3f/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:185 [inline]
 do_idle+0x1a0/0x470 kernel/sched/idle.c:326
 cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:424
 rest_init+0x10b/0x130 init/main.c:747
 start_kernel+0x460/0x4bb init/main.c:1105
 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
 common_startup_64+0x13b/0x157
 </TASK>