INFO: task syz.3.5630:15558 blocked for more than 143 s
INFO: task syz.3.5630:15558 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.3.5630      state:D stack:27584 pid:15558 tgid:15556 ppid:20130  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 md_allow_write+0x3b3/0x520
 raid1_reshape+0x383/0x14a0
 chunk_size_store+0x2e1/0x480
 md_attr_store+0x3b7/0x640
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00e979f559
RSP: 002b:00007f00ea750028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f00e9a25fa0 RCX: 00007f00e979f559
RDX: 0000000000000014 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f00e9836b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00e9a26038 R14: 00007f00e9a25fa0 R15: 00007ffd6711a578
 </TASK>
INFO: task syz.3.5630:15566 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.3.5630      state:D stack:28808 pid:15566 tgid:15556 ppid:20130  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 fdget_pos+0x246/0x320
 ksys_write+0x79/0x270
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00e979f559
RSP: 002b:00007f00ea6ed028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f00e9a26270 RCX: 00007f00e979f559
RDX: 0000000000000014 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f00e9836b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00e9a26308 R14: 00007f00e9a26270 R15: 00007ffd6711a578
 </TASK>

Showing all locks held in the system:
locks held by pr/ttyS0/16: 2, last CPU#1:
 #0: ffffffff8fc36518 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x30/0x60
 #1: ffffffff9bd4fe58 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x67/0xc0
locks held by khungtaskd/38: 1, last CPU#0:
 #0: ffffffff8fd5c8e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5422: 2, on CPU#0:
 #0: ffff888116fad0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034932e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by syz.3.5630/15558: 5, on CPU#0:
 #0: ffff888101b5e6f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff8881178ca460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffff8881bc66d080 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #3: ffff8881a3f914b8 (kn->active#86){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #4: ffff8881bfcda358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: chunk_size_store+0xbb/0x480
locks held by syz.3.5630/15566: 1, on CPU#1:
 #0: ffff888101b5e6f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
locks held by syz.1.7026/28380: 3, on CPU#1:
 #0: ffff88816981a868 (&fc->uapi_mutex){+.+.}-{4:4}, at: __se_sys_fsconfig+0x68d/0x810
 #1: ffff8881bb75c0e8 (&type->s_umount_key#77/1){+.+.}-{4:4}, at: sget_fc+0x9d4/0x1a60
 #2: ffff8881698a4088 (&client->mount_mutex){+.+.}-{4:4}, at: ceph_get_tree+0x885/0x1a40
locks held by syz.4.7028/28401: 1, on CPU#0:
 #0: ffffffff906a4780 (reading_mutex){+.+.}-{4:4}, at: rng_dev_read+0x104/0x7c0
locks held by syz.4.7028/28407: 1, last CPU#0:
 #0: ffffffff906a4780 (reading_mutex){+.+.}-{4:4}, at: rng_dev_read+0x104/0x7c0
locks held by md1_resync/28418: 1, last CPU#0:
 #0: ffffffff8fd5c8e0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 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+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 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: 16 Comm: pr/ttyS0 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:io_serial_in+0x77/0xc0
Code: e8 fe 6a 52 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 4f 4c c4 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 ca bd 76 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc900001578b8 EFLAGS: 00000002
RAX: 1ffffffff37a9f60 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff8575b710 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff9bd4fe80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a7cbb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14f77ecc40 CR3: 000000019c124000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 wait_for_lsr+0xbc/0x2f0
 __serial8250_console_fifo_write+0xcd/0x3e0
 serial8250_console_write+0xaa1/0x1200
 nbcon_emit_next_record+0xef5/0x1a90
 nbcon_kthread_func+0x679/0x880
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
