INFO: task syz.0.791:12748 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.791       state:D stack:28728 pid:12748 tgid:12722 ppid:12603  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x8a1/0x1080
 down_write+0x1bc/0x200
 path_openat+0xb53/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96dcd9acb9
RSP: 002b:00007f96ddc8e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f96dd016090 RCX: 00007f96dcd9acb9
RDX: 0000000000000042 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f96dce08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f96dd016128 R14: 00007f96dd016090 R15: 00007ffcac172ac8
 </TASK>
INFO: task syz.0.791:12752 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.791       state:D stack:28728 pid:12752 tgid:12722 ppid:12603  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x8a1/0x1080
 down_write+0x1bc/0x200
 path_openat+0xb53/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96dcd9acb9
RSP: 002b:00007f96ddc6d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f96dd016180 RCX: 00007f96dcd9acb9
RDX: 0000000000183042 RSI: 0000200000000740 RDI: ffffffffffffff9c
RBP: 00007f96dce08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f96dd016218 R14: 00007f96dd016180 R15: 00007ffcac172ac8
 </TASK>
INFO: task syz.0.791:12757 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.791       state:D stack:27448 pid:12757 tgid:12722 ppid:12603  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x8a1/0x1080
 down_write_nested+0x1c6/0x210
 filename_create+0x200/0x370
 do_mkdirat+0xd2/0x4b0
 __x64_sys_mkdirat+0x87/0xa0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96dcd99b97
RSP: 002b:00007f96ddc4be58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f96ddc4bee0 RCX: 00007f96dcd99b97
RDX: 00000000000001ff RSI: 0000200000000140 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000140
R13: 00007f96ddc4bea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e341b60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u9:2/981:
 #0: ffff8881042a6148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900077efbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88816f5280e0 (&type->s_umount_key#76){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881b7beefa8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
2 locks held by getty/5656:
 #0: ffff8881126fc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by kworker/0:4/5887:
 #0: ffff88812103a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888121024588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
3 locks held by kworker/0:5/5901:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90005737bc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8e3476b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
3 locks held by kworker/0:7/5911:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900057b7bc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88810e1b0240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
4 locks held by syz.0.791/12723:
2 locks held by syz.0.791/12748:
 #0: ffff88816f528420 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b7bef358 (&type->i_mutex_dir_key#19){++++}-{4:4}, at: path_openat+0xb53/0x3e20
2 locks held by syz.0.791/12752:
 #0: ffff88816f528420 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b7bef358 (&type->i_mutex_dir_key#19){++++}-{4:4}, at: path_openat+0xb53/0x3e20
2 locks held by syz.0.791/12757:
 #0: ffff88816f528420 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b7bef358 (&type->i_mutex_dir_key#19/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
2 locks held by syz.9.1006/15057:
 #0: ffff88816f5280e0 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816c80a820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c0/0xb80
2 locks held by syz.2.1180/16667:
 #0: ffff88816f5280e0 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816c80a820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c0/0xb80
3 locks held by syz-executor/16912:
 #0: ffff888198370ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5a0
 #1: ffff8881983700c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0
 #2: ffffffff8e3476b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.6.1226/16962:
 #0: ffffffff8f714e88 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
2 locks held by cmp/17033:

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

NMI backtrace for cpu 1
CPU: 1 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/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 12723 Comm: syz.0.791 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:__sanitizer_cov_trace_pc+0x3b/0x70
Code: 8b 15 69 c9 fe 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 16 00 00 00 74 2c 8b 91 48 16 00 00 83 fa 02 75 21 <48> 8b 91 50 16 00 00 48 8b 32 48 8d 7e 01 8b 89 4c 16 00 00 48 39
RSP: 0018:ffffc90007e6f680 EFLAGS: 00000246
RAX: ffffffff834f4606 RBX: 0000000000000004 RCX: ffff888168493a80
RDX: 0000000000000002 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffff888194ac1000 R08: 0000000200000000 R09: 0000000000000000
R10: 0030000000000000 R11: 000007ff00000020 R12: dffffc0000000000
R13: 1ffff11032958200 R14: 0000000000000000 R15: 1ffff11032958202
FS:  00007f96ddcaf6c0(0000) GS:ffff88818e40b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff003e0508 CR3: 00000001700ce000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dtSplitRoot+0x7a6/0x16c0
 dtInsert+0xedd/0x5de0
 jfs_mkdir+0x783/0xb00
 vfs_mkdir+0x511/0x5b0
 do_mkdirat+0x27d/0x4b0
 __x64_sys_mkdir+0x6c/0x80
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96dcd9acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f96ddcaf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f96dd015fa0 RCX: 00007f96dcd9acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000340
RBP: 00007f96dce08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f96dd016038 R14: 00007f96dd015fa0 R15: 00007ffcac172ac8
 </TASK>
