INFO: task syz.2.273:7684 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.273       state:D stack:15112 pid:7684  tgid:7683  ppid:5861   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 __closure_sync+0x163/0x220
 bch2_read_iter+0x1034/0x1440
 do_iter_readv_writev+0x61c/0x8b0
 vfs_readv+0x253/0x850
 __se_sys_preadv2+0x179/0x290
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff22d8ebe9
RSP: 002b:00007eff23ce1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000147
RAX: ffffffffffffffda RBX: 00007eff22fc5fa0 RCX: 00007eff22d8ebe9
RDX: 0000000000000001 RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007eff22e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007eff22fc6038 R14: 00007eff22fc5fa0 R15: 00007ffe692c7348
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5672:
 #0: 
ffff8880262bd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
7 locks held by syz.4.819/14411:
4 locks held by syz.1.825/14502:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 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: 14411 Comm: syz.4.819 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:check_preemption_disabled+0x1/0x120
Code: 20 36 e3 8b 48 c7 c6 60 36 e3 8b eb 1c 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 55 <41> 57 41 56 53 48 83 ec 10 65 48 8b 05 be 8e 26 07 48 89 44 24 08
RSP: 0018:ffffc900037eece8 EFLAGS: 00000046
RAX: 6a34b01c46110937 RBX: 0000000000000283 RCX: c70e7b311203ba00
RDX: 0000000000000007 RSI: ffffffff8dba6cac RDI: ffffffff8be33680
RBP: ffff88810a55e248 R08: 0000000000000000 R09: ffffffff822b940a
R10: dffffc0000000000 R11: fffff94000170451 R12: 0000000000000007
R13: 0000000000000007 R14: ffff88804b03b400 R15: ffff88810a55d640
FS:  00007fc67c2a16c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555572375c8 CR3: 000000012c1ec000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_release+0x27a/0x3e0
 try_charge_memcg+0x581/0x1290
 charge_memcg+0x9f/0x180
 __mem_cgroup_charge+0x25/0x80
 filemap_add_folio+0x49/0x270
 alloc_extent_buffer+0x731/0x2a40
 btrfs_alloc_tree_block+0x249/0x1290
 btrfs_force_cow_block+0x578/0x2460
 btrfs_cow_block+0x40a/0x9a0
 merge_reloc_root+0x10cc/0x19f0
 merge_reloc_roots+0x34e/0x890
 relocate_block_group+0xb11/0xd90
 btrfs_relocate_block_group+0x6bc/0xc60
 btrfs_relocate_chunk+0x12f/0x5c0
 __btrfs_balance+0x1860/0x23f0
 btrfs_balance+0xac2/0x11b0
 btrfs_ioctl_balance+0x3d3/0x610
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc67b38ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc67c2a1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc67b5c5fa0 RCX: 00007fc67b38ebe9
RDX: 0000200000000040 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fc67b411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc67b5c6038 R14: 00007fc67b5c5fa0 R15: 00007fff79422918
 </TASK>
