INFO: task syz-executor:15243 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:15243 tgid:15243 ppid:1      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
 netfs_wait_for_outstanding_io include/linux/netfs.h:543 [inline]
 v9fs_evict_inode+0x15b/0x2d0 fs/9p/vfs_inode.c:348
 evict+0x4d5/0x990 fs/inode.c:725
 iput_final fs/inode.c:1877 [inline]
 iput+0x633/0x930 fs/inode.c:1903
 dentry_unlink_inode+0x373/0x420 fs/dcache.c:412
 __dentry_kill+0x21b/0x670 fs/dcache.c:615
 dput+0x59/0xd0 fs/dcache.c:857
 do_one_tree+0xbd/0xf0 fs/dcache.c:1553
 shrink_dcache_for_umount+0x92/0x140 fs/dcache.c:1567
 generic_shutdown_super+0x6a/0x300 fs/super.c:620
 kill_anon_super+0x4b/0x1d0 fs/super.c:1237
 v9fs_kill_super+0x50/0x90 fs/9p/vfs_super.c:193
 deactivate_locked_super+0xd0/0x290 fs/super.c:473
 deactivate_super+0xb8/0xe0 fs/super.c:506
 cleanup_mnt+0x3f1/0x480 fs/namespace.c:1369
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1376
 task_work_run+0x1e0/0x250 kernel/task_work.c:239
 resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f67195902f7
RSP: 002b:00007fffda41e908 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f6719611d7d RCX: 00007f67195902f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffda41e9c0
RBP: 00007fffda41e9c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffda41fa50
R13: 00007f6719611d7d R14: 000000000003e9f0 R15: 00007fffda41fa90
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 cdafc7cc949afd6a8ac8fea4aa2bc63f9b555095
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 cdafc7cc949afd6a8ac8fea4aa2bc63f9b555095
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 df 98 3e 9a 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 d9 46 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c2
RAX: ffff8881f6f00000 RBX: ffff888103651140 RCX: ffffffff85407a5e
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 00000000001666bc
RBP: ffffc900001a7e00 R08: ffff8881f6f396b3 R09: 1ffff1103ede72d6
R10: dffffc0000000000 R11: ffffed103ede72d7 R12: 1ffff110206ca228
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff8763be28
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd9190afd8 CR3: 000000010b32e000 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
 start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
 common_startup_64+0x13b/0x157
 </TASK>