INFO: task syz.1.497:10964 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.497       state:D stack:25320 pid:10964 tgid:10963 ppid:10265  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: 0033:0x7f5f8419ce59
RSP: 002b:00007f5f85068028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5f84415fa0 RCX: 00007f5f8419ce59
RDX: 000000000000275a RSI: 0000200000006ac0 RDI: ffffffffffffff9c
RBP: 00007f5f84232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f84416038 R14: 00007f5f84415fa0 R15: 00007ffe57a80ea8
 </TASK>
INFO: task syz.1.497:10965 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.497       state:D stack:26792 pid:10965 tgid:10963 ppid:10265  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: 0033:0x7f5f8419ce59
RSP: 002b:00007f5f85047028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5f84416090 RCX: 00007f5f8419ce59
RDX: 000000000000275a RSI: 0000200000000340 RDI: ffffffffffffff9c
RBP: 00007f5f84232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f84416128 R14: 00007f5f84416090 R15: 00007ffe57a80ea8
 </TASK>
INFO: task syz.1.497:10966 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.497       state:D stack:25704 pid:10966 tgid:10963 ppid:10265  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: 0033:0x7f5f8419ce59
RSP: 002b:00007f5f85026028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5f84416180 RCX: 00007f5f8419ce59
RDX: 000000000000275a RSI: 0000200000000200 RDI: ffffffffffffff9c
RBP: 00007f5f84232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f84416218 R14: 00007f5f84416180 R15: 00007ffe57a80ea8
 </TASK>
INFO: task syz.1.497:10971 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.497       state:D stack:28808 pid:10971 tgid:10963 ppid:10265  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: 0033:0x7f5f8419ce59
RSP: 002b:00007f5f85005028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5f84416270 RCX: 00007f5f8419ce59
RDX: 000000000000275a RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f5f84232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f84416308 R14: 00007f5f84416270 R15: 00007ffe57a80ea8
 </TASK>
INFO: task syz.1.497:10973 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.497       state:D stack:24776 pid:10973 tgid:10963 ppid:10265  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: 0033:0x7f5f8419ce59
RSP: 002b:00007f5f84fe4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5f84416360 RCX: 00007f5f8419ce59
RDX: 000000000000275a RSI: 0000200000000240 RDI: ffffffffffffff9c
RBP: 00007f5f84232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f844163f8 R14: 00007f5f84416360 R15: 00007ffe57a80ea8
 </TASK>
INFO: task syz.1.497:10975 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.497       state:D stack:28808 pid:10975 tgid:10963 ppid:10265  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: 0033:0x7f5f8419ce59
RSP: 002b:00007f5f84fc3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5f84416450 RCX: 00007f5f8419ce59
RDX: 000000000000275a RSI: 0000200000000a40 RDI: ffffffffffffff9c
RBP: 00007f5f84232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f844164e8 R14: 00007f5f84416450 R15: 00007ffe57a80ea8
 </TASK>
INFO: task syz.1.497:10976 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.497       state:D stack:28424 pid:10976 tgid:10963 ppid:10265  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: 0033:0x7f5f8419ce59
RSP: 002b:00007f5f84fa2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5f84416540 RCX: 00007f5f8419ce59
RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f5f84232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f844165d8 R14: 00007f5f84416540 R15: 00007ffe57a80ea8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5435:
 #0: ffff88816e3430a0 (&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.1.497/10964:
 #0: ffff88811774e450 (sb_writers#27){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.1.497/10965:
 #0: ffff88811774e450 (sb_writers#27){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.1.497/10966:
 #0: ffff88811774e450 (sb_writers#27){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.1.497/10971:
 #0: ffff88811774e450 (sb_writers#27){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.1.497/10973:
 #0: ffff88811774e450 (sb_writers#27){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.1.497/10975:
 #0: ffff88811774e450 (sb_writers#27){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.1.497/10976:
 #0: ffff88811774e450 (sb_writers#27){++++}-{0:0}, at: mnt_want_write+0x41/0x90

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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: 0 Comm: swapper/1 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:pv_native_safe_halt+0xf/0x20
Code: 6c 75 02 e9 13 05 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d f3 79 14 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e40 EFLAGS: 00000202
RAX: 000000000006b2bf RBX: ffffffff819aa370 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8dfe379e RDI: ffffffff8c2aba80
RBP: ffffc90000197f10 R08: ffff88823c6338db R09: 1ffff110478c671b
R10: dffffc0000000000 R11: ffffed10478c671c R12: 0000000000000000
R13: 1ffff1102c09d000 R14: 1ffff92000032fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8882a921d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdf4f0ddb0 CR3: 000000010f20e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x2e0/0x540
 cpu_startup_entry+0x43/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x157
 </TASK>
