INFO: task syz.2.5441:20331 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.5441      state:D stack:25160 pid:20331 tgid:20330 ppid:19724  task_flags:0x400548 flags:0x00024000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 wait_for_completion+0x2bf/0x5d0
 io_wq_put_and_exit+0x316/0x650
 io_uring_clean_tctx+0x11f/0x1a0
 io_uring_cancel_generic+0x6ca/0x7d0
 do_exit+0x345/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe63a38ebe9
RSP: 002b:00007fe63b1cf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fe63a5b5fa8 RCX: 00007fe63a38ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe63a5b5fa8
RBP: 00007fe63a5b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe63a5b6038 R14: 00007fff69d44ed0 R15: 00007fff69d44fb8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 20339 Comm: iou-wrk-20331 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__rdmsr_safe_on_cpu+0x3c/0x130
Code: bd 00 00 00 00 00 fc ff df e8 c0 db bf fc 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 82 00 00 00 44 8b 23 44 89 e1 0f 32 <31> ed 49 89 c7 49 89 d6 0f 1f 44 00 00 e8 92 db bf fc 49 c1 e6 20
RSP: 0018:ffffc900086f7428 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc900086f7600 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffc900086f7600
RBP: ffffc900086f7538 R08: ffffffff8fa38337 R09: 1ffffffff1f47066
R10: dffffc0000000000 R11: ffffffff84ffcf50 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff84ffcf50 R15: 1ffff920010deeb9
FS:  00007fe63b1cf6c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001ae000 CR3: 0000000042380000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 generic_exec_single+0x23a/0x500
 smp_call_function_single_async+0x79/0x110
 rdmsr_safe_on_cpu+0x127/0x230
 msr_read+0x14d/0x250
 loop_rw_iter+0x425/0x660
 __io_read+0x1326/0x14f0
 io_read+0x1c/0x60
 __io_issue_sqe+0x181/0x4b0
 io_issue_sqe+0x165/0xfd0
 io_wq_submit_work+0x6e9/0xb90
 io_worker_handle_work+0x7cd/0x1180
 io_wq_worker+0x42f/0xeb0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
vkms_vblank_simulate: vblank timer overrun
