INFO: task syz.2.340:8825 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.340       state:D stack:24776 pid:8825  tgid:8824  ppid:8450   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 percpu_rwsem_wait+0x324/0x490
 __percpu_down_read+0xec/0x130
 sb_start_write+0x18e/0x1c0
 mnt_want_write+0x41/0x90
 path_openat+0xa75/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabe739ce59
RSP: 002b:00007fabe832b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabe7615fa0 RCX: 00007fabe739ce59
RDX: 000000000000275a RSI: 0000200000000200 RDI: ffffffffffffff9c
RBP: 00007fabe7432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe7616038 R14: 00007fabe7615fa0 R15: 00007ffdc202d988
 </TASK>
INFO: task syz.2.340:8832 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.340       state:D stack:25704 pid:8832  tgid:8824  ppid:8450   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 percpu_rwsem_wait+0x324/0x490
 __percpu_down_read+0xec/0x130
 sb_start_write+0x18e/0x1c0
 mnt_want_write+0x41/0x90
 path_openat+0xa75/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabe739ce59
RSP: 002b:00007fabe830a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabe7616090 RCX: 00007fabe739ce59
RDX: 000000000000275a RSI: 0000200000006ac0 RDI: ffffffffffffff9c
RBP: 00007fabe7432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe7616128 R14: 00007fabe7616090 R15: 00007ffdc202d988
 </TASK>
INFO: task syz.2.340:8839 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.340       state:D stack:28808 pid:8839  tgid:8824  ppid:8450   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 percpu_rwsem_wait+0x324/0x490
 __percpu_down_read+0xec/0x130
 sb_start_write+0x18e/0x1c0
 mnt_want_write+0x41/0x90
 path_openat+0xa75/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabe739ce59
RSP: 002b:00007fabe82e9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabe7616180 RCX: 00007fabe739ce59
RDX: 000000000000275a RSI: 0000200000000340 RDI: ffffffffffffff9c
RBP: 00007fabe7432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe7616218 R14: 00007fabe7616180 R15: 00007ffdc202d988
 </TASK>
INFO: task syz.2.340:8841 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.340       state:D stack:28808 pid:8841  tgid:8824  ppid:8450   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 percpu_rwsem_wait+0x324/0x490
 __percpu_down_read+0xec/0x130
 sb_start_write+0x18e/0x1c0
 mnt_want_write+0x41/0x90
 path_openat+0xa75/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabe739ce59
RSP: 002b:00007fabe82c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabe7616270 RCX: 00007fabe739ce59
RDX: 000000000000275a RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007fabe7432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe7616308 R14: 00007fabe7616270 R15: 00007ffdc202d988
 </TASK>
INFO: task syz.2.340:8844 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.340       state:D stack:25512 pid:8844  tgid:8824  ppid:8450   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 percpu_rwsem_wait+0x324/0x490
 __percpu_down_read+0xec/0x130
 sb_start_write+0x18e/0x1c0
 mnt_want_write+0x41/0x90
 path_openat+0xa75/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabe739ce59
RSP: 002b:00007fabe82a7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabe7616360 RCX: 00007fabe739ce59
RDX: 000000000000275a RSI: 0000200000000240 RDI: ffffffffffffff9c
RBP: 00007fabe7432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe76163f8 R14: 00007fabe7616360 R15: 00007ffdc202d988
 </TASK>
INFO: task syz.2.340:8849 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.340       state:D stack:28808 pid:8849  tgid:8824  ppid:8450   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 percpu_rwsem_wait+0x324/0x490
 __percpu_down_read+0xec/0x130
 sb_start_write+0x18e/0x1c0
 mnt_want_write+0x41/0x90
 path_openat+0xa75/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabe739ce59
RSP: 002b:00007fabe8286028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabe7616450 RCX: 00007fabe739ce59
RDX: 000000000000275a RSI: 0000200000000a40 RDI: ffffffffffffff9c
RBP: 00007fabe7432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe76164e8 R14: 00007fabe7616450 R15: 00007ffdc202d988
 </TASK>
INFO: task syz.2.340:8851 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.340       state:D stack:28424 pid:8851  tgid:8824  ppid:8450   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 percpu_rwsem_wait+0x324/0x490
 __percpu_down_read+0xec/0x130
 sb_start_write+0x18e/0x1c0
 mnt_want_write+0x41/0x90
 path_openat+0xa75/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabe739ce59
RSP: 002b:00007fabe8265028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabe7616540 RCX: 00007fabe739ce59
RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007fabe7432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe76165d8 R14: 00007fabe7616540 R15: 00007ffdc202d988
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5440:
 #0: ffff8881103820a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
1 lock held by syz.2.340/8825:
 #0: ffff888113230450 (sb_writers#35){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.2.340/8832:
 #0: ffff888113230450 (sb_writers#35){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.2.340/8839:
 #0: ffff888113230450 (sb_writers#35){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.2.340/8841:
 #0: ffff888113230450 (sb_writers#35){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.2.340/8844:
 #0: ffff888113230450 (sb_writers#35){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.2.340/8849:
 #0: ffff888113230450 (sb_writers#35){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.2.340/8851:
 #0: ffff888113230450 (sb_writers#35){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz-executor/11200:
7 locks held by syz.1.791/12867:

=============================================

NMI backtrace for cpu 0
CPU: 0 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 951 Comm: kworker/u9:2 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
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:mark_lock+0x3e/0x190
Code: 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 94 63 a5 12 73 10 <48> 69 c0 c8 00 00 00 48 8d 88 10 c5 e8 93 eb 42 83 3d 5b f3 a8 18
RSP: 0018:ffffc900068df940 EFLAGS: 00000007
RAX: 00000000000000cc RBX: 0000000000000006 RCX: 0000000000000006
RDX: 0000000000000006 RSI: ffff888102f7a960 RDI: ffff888102f79dc0
RBP: 0000000000000040 R08: ffffffff9032f8f7 R09: 1ffffffff2065f1e
R10: dffffc0000000000 R11: fffffbfff2065f1f R12: ffff888102f7aa00
R13: 0000000000000000 R14: ffff888102f7a960 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a9220000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe5ef3c108 CR3: 000000016dbbe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lockdep_hardirqs_on_prepare+0x179/0x270
 trace_hardirqs_on+0x28/0x40
 kasan_quarantine_put+0xbb/0x1f0
 kmem_cache_free+0x182/0x650
 nsim_dev_trap_report_work+0x7ac/0xb40
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
