INFO: task syz-executor:5844 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:23640 pid:5844  tgid:5844  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 netfs_wait_for_outstanding_io include/linux/netfs.h:552 [inline]
 v9fs_evict_inode+0x26f/0x300 fs/9p/vfs_inode.c:348
 evict+0x3e3/0x920 fs/inode.c:810
 dispose_list+0x117/0x1e0 fs/inode.c:852
 evict_inodes+0x365/0x460 fs/inode.c:906
 generic_shutdown_super+0xb2/0x390 fs/super.c:628
 kill_anon_super+0x3a/0x60 fs/super.c:1282
 v9fs_kill_super+0x3d/0xa0 fs/9p/vfs_super.c:195
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1375
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f777418ff17
RSP: 002b:00007ffc7129f328 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7774211c05 RCX: 00007f777418ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc7129f3e0
RBP: 00007ffc7129f3e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc712a0470
R13: 00007f7774211c05 R14: 0000000000083940 R15: 00007ffc712a04b0
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf0e/0x1260 kernel/hung_task.c:491
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 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: 14468 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:vfree+0x21c/0xb50 mm/vmalloc.c:3426
Code: 4c 89 f7 83 c3 01 e8 73 b9 02 00 31 d2 be 6b 0d 00 00 48 c7 c7 20 f5 bb 8b e8 20 c0 76 ff 2e 2e 2e 31 c0 48 8b 04 24 0f b6 10 <4c> 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 aa 07 00 00 45
RSP: 0018:ffffc9000482fc30 EFLAGS: 00000246
RAX: ffffed100508da25 RBX: 0000000000000146 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000d6b RDI: ffff8880547faec0
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffed10170a8010
R10: ffff8880b8540083 R11: 0000000000000000 R12: ffffed100508da24
R13: ffff88802846d12c R14: ffffea000194cac0 R15: ffff88802846d100
FS:  0000000000000000(0000) GS:ffff8881247bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc218fee038 CR3: 000000000e380000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kcov_put kernel/kcov.c:439 [inline]
 kcov_put kernel/kcov.c:435 [inline]
 kcov_close+0x34/0x60 kernel/kcov.c:535
 __fput+0x3ff/0xb70 fs/file_table.c:468
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x86f/0x2bf0 kernel/exit.c:961
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
 x64_sys_call+0x14fa/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f838cd8ebe9
Code: Unable to access opcode bytes at 0x7f838cd8ebbf.
RSP: 002b:00007fff6d644bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f838cd8ebe9
RDX: 00007f838cd8d660 RSI: 0000000000000004 RDI: 0000000000000001
RBP: 00007f838cfb67b8 R08: 00007fff6d642997 R09: 0000000000000008
R10: 0000000000000019 R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
vkms_vblank_simulate: vblank timer overrun