INFO: task syz.3.2447:16517 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2447      state:D stack:28736 pid:16517 tgid:16492 ppid:16311  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x5300
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write_nested+0x1c6/0x210
 filename_unlinkat+0x2a7/0x610
 __se_sys_unlink+0x2e/0x140
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41bff9c799
RSP: 002b:00007f41c0dc9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f41c0216090 RCX: 00007f41bff9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000900
RBP: 00007f41c0032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41c0216128 R14: 00007f41c0216090 R15: 00007ffd2ff39128
 </TASK>
INFO: task syz.3.2447:16521 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2447      state:D stack:28800 pid:16521 tgid:16492 ppid:16311  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x5300
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 path_openat+0xb4c/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41bff9c799
RSP: 002b:00007f41c0da8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f41c0216180 RCX: 00007f41bff9c799
RDX: 0000000000000042 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f41c0032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41c0216218 R14: 00007f41c0216180 R15: 00007ffd2ff39128
 </TASK>
INFO: task syz.3.2447:16524 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2447      state:D stack:28160 pid:16524 tgid:16492 ppid:16311  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x5300
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 vfs_set_acl+0x3af/0xc00
 do_set_acl+0xf5/0x190
 filename_setxattr+0x305/0x630
 path_setxattrat+0x3eb/0x440
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41bff9c799
RSP: 002b:00007f41c0d87028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f41c0216270 RCX: 00007f41bff9c799
RDX: 0000200000000340 RSI: 0000200000002a40 RDI: 0000200000002a00
RBP: 00007f41c0032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000024 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41c0216308 R14: 00007f41c0216270 R15: 00007ffd2ff39128
 </TASK>
INFO: task syz.3.2447:16526 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2447      state:D stack:28800 pid:16526 tgid:16492 ppid:16311  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x5300
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 lookup_slow+0x46/0x70
 path_lookupat+0x3f5/0x8c0
 filename_lookup+0x256/0x5d0
 do_fchownat+0xfa/0x250
 __x64_sys_lchown+0x85/0xa0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41bff9c799
RSP: 002b:00007f41bd9f2028 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007f41c0216360 RCX: 00007f41bff9c799
RDX: 000000000000000a RSI: 000000003a736e6f RDI: 0000200000000100
RBP: 00007f41c0032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41c02163f8 R14: 00007f41c0216360 R15: 00007ffd2ff39128
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffffffff8e7647f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by syslogd/5238:
2 locks held by getty/5634:
 #0: ffff8881112e90a0 (&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
4 locks held by kworker/u9:28/9680:
 #0: ffff888162689148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000a15fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff888108eda0e0 (&type->s_umount_key#62){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff88811ba9c1e0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
4 locks held by syz.3.2447/16494:
2 locks held by syz.3.2447/16517:
 #0: ffff888108eda420 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88811ba9c590 (&type->i_mutex_dir_key#22/1){+.+.}-{4:4}, at: filename_unlinkat+0x2a7/0x610
2 locks held by syz.3.2447/16521:
 #0: ffff888108eda420 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88811ba9c590 (&type->i_mutex_dir_key#22){++++}-{4:4}, at: path_openat+0xb4c/0x3860
2 locks held by syz.3.2447/16524:
 #0: ffff888108eda420 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88811ba9c590 (&type->i_mutex_dir_key#22){++++}-{4:4}, at: vfs_set_acl+0x3af/0xc00
1 lock held by syz.3.2447/16526:
 #0: ffff88811ba9c590 (&type->i_mutex_dir_key#22){++++}-{4:4}, at: lookup_slow+0x46/0x70
2 locks held by syz.7.2656/17345:
 #0: ffff888108eda0e0 (&type->s_umount_key#62){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816ca8c820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c2/0xbd0
2 locks held by syz.7.2656/17349:
 #0: ffff888108eda0e0 (&type->s_umount_key#62){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816ca8c820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c2/0xbd0
2 locks held by syz.4.3190/19760:
 #0: ffffffff8fbd1a08 (rtnl_mutex){+.+.}-{4:4}, at: ppp_release+0x87/0x1f0
 #1: ffffffff8e7647f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 16494 Comm: syz.3.2447 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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_const_cmp1+0x8/0x90
Code: e9 3d 5c e9 09 cc 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 15 78 36 56 11 65 8b 0d 99 36 56 11 81 e1 00 01 ff 00 74
RSP: 0018:ffffc9000afcf660 EFLAGS: 00000246
RAX: ffffffff835ab8f5 RBX: 0000000000000004 RCX: 0000000000080000
RDX: ffffc90024621000 RSI: 0000000000000000 RDI: 00000000000000ff
RBP: 0000000000000000 R08: 00000000000001ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888113546000 R14: 0000000000000000 R15: 1ffff110226a8c02
FS:  00007f41c0dea6c0(0000) GS:ffff88818de63000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005625b3f9f000 CR3: 00000001950a6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 dtSplitRoot+0x775/0x16c0
 dtInsert+0xf19/0x5f10
 jfs_symlink+0x8b5/0xfd0
 vfs_symlink+0x195/0x340
 filename_symlinkat+0x1cd/0x410
 __se_sys_symlink+0x4d/0x2b0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41bff9c799
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:00007f41c0dea028 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f41c0215fa0 RCX: 00007f41bff9c799
RDX: 0000000000000000 RSI: 0000200000000cc0 RDI: 000020000000a900
RBP: 00007f41c0032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41c0216038 R14: 00007f41c0215fa0 R15: 00007ffd2ff39128
 </TASK>
