INFO: task syz.6.279:7908 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.279       state:D stack:25848 pid:7908  tgid:7907  ppid:7600   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x240
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc3d319ce59
RSP: 002b:00007fc3d40a7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc3d3415fa0 RCX: 00007fc3d319ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc3d3415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc3d3416038 R14: 00007fc3d3415fa0 R15: 00007ffcff96c578
 </TASK>
INFO: lockdep is turned off.
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/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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12084 Comm: syz.2.762 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:io_serial_in+0x77/0xc0
Code: e8 4e e0 7b 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 df 71 e9 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 4a 35 6b 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90007e265d8 EFLAGS: 00000006
RAX: 1ffffffff34ffb05 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc90007e26770 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff854a5050 R12: dffffc0000000000
R13: ffffffff9a7fddc0 R14: ffffffff9a7fde00 R15: 0000000000000000
FS:  00007fed858546c0(0000) GS:ffff88818dc2d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd487ff000 CR3: 0000000115130000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 serial8250_console_write+0x503/0x1ba0
 console_flush_all+0x6ea/0xaf0
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 print_hex_dump+0x1d2/0x2b0
 xfs_hex_dump+0x3d/0x50
 xfs_buf_verifier_error+0x1cc/0x2a0
 xfs_inobt_read_verify+0x5f/0xe0
 __xfs_buf_ioend+0x342/0x700
 xfs_buf_iowait+0x156/0x480
 xfs_buf_read_map+0x31f/0xa00
 xfs_trans_read_buf_map+0x235/0x820
 xfs_btree_read_buf_block+0x2ae/0x4a0
 xfs_btree_lookup_get_block+0x294/0x4f0
 xfs_btree_lookup+0x43f/0x1320
 xfs_dialloc_ag_finobt_near+0x13f/0x670
 xfs_dialloc+0xeab/0x19c0
 xfs_qm_qino_alloc+0x223/0x6c0
 xfs_qm_init_quotainos+0x6d8/0x9b0
 xfs_qm_init_quotainfo+0x168/0x11b0
 xfs_qm_mount_quotas+0xa5/0x660
 xfs_mountfs+0x1bc8/0x2380
 xfs_fs_fill_super+0x115a/0x15a0
 get_tree_bdev_flags+0x430/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x319/0xdc0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed8499e0ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fed85853e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fed85853ee0 RCX: 00007fed8499e0ca
RDX: 0000200000009740 RSI: 0000200000009780 RDI: 00007fed85853ea0
RBP: 0000200000009740 R08: 00007fed85853ee0 R09: 0000000000000080
R10: 0000000000000080 R11: 0000000000000246 R12: 0000200000009780
R13: 00007fed85853ea0 R14: 00000000000097e8 R15: 0000200000000340
 </TASK>
