INFO: task syz.2.19:497 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:0     pid:497   tgid:496   ppid:478    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1370/0x1d00 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:7058
 schedule_timeout+0xb1/0x230 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x23a/0x4b0 kernel/sched/completion.c:153
 __flush_work+0x6a0/0x860 kernel/workqueue.c:4244
 __cancel_work_sync kernel/workqueue.c:4364 [inline]
 cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4401
 p9_conn_destroy net/9p/trans_fd.c:916 [inline]
 p9_fd_close+0x252/0x450 net/9p/trans_fd.c:951
 p9_client_create+0xc65/0x1190 net/9p/client.c:1060
 v9fs_session_init+0x1e0/0x1810 fs/9p/v9fs.c:410
 v9fs_mount+0xd6/0xa30 fs/9p/vfs_super.c:122
 legacy_get_tree+0x103/0x1b0 fs/fs_context.c:666
 vfs_get_tree+0xa1/0x290 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
 path_mount+0x688/0x1050 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount+0x340/0x490 fs/namespace.c:4324
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4324
 x64_sys_call+0x2ae5/0x2fd0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9ee338ec29
RSP: 002b:00007f9ee4203038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9ee35d5fa0 RCX: 00007f9ee338ec29
RDX: 0000200000000400 RSI: 00002000000003c0 RDI: 0000000000000000
RBP: 00007f9ee3411e41 R08: 0000200000000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9ee35d6038 R14: 00007f9ee35d5fa0 R15: 00007ffdfba0c4d8
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT  0077e931db40fe91bda204816bedcc47c0894e95
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+0x10b/0x180 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bd/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:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xc2c/0xc80 kernel/hung_task.c:491
 kthread+0x6f4/0x880 kernel/kthread.c:463
 ret_from_fork+0x184/0x250 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT  0077e931db40fe91bda204816bedcc47c0894e95
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:82
Code: cc cc cc b8 cc 82 3c 7f 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 63 bb 28 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 13 6d 02 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000187e00 EFLAGS: 000002c2
RAX: ffff88826e68e000 RBX: ffff888103666780 RCX: ffffffff859e9fde
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 00000000000eb9a4
RBP: ffffc90000187e00 R08: ffff8881f6f34603 R09: 1ffff1103ede68c0
R10: dffffc0000000000 R11: ffffed103ede68c1 R12: 1ffff110206cccf0
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff87c753b0
FS:  0000000000000000(0000) GS:ffff88826e68e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28f4201f98 CR3: 000000010a3cc000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:757
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:794
 default_idle_call+0x3f/0x80 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x19c/0x470 kernel/sched/idle.c:330
 cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:428
 start_secondary+0x12a/0x140 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13b/0x157
 </TASK>