INFO: task syz-executor.5:25105 blocked for more than 143 seconds.
Not tainted 5.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack:27936 pid:25105 ppid: 11465 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326
blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
lo_release+0x160/0x1f0 drivers/block/loop.c:1768
blkdev_put_whole block/bdev.c:694 [inline]
blkdev_put+0x2fb/0x9e0 block/bdev.c:956
deactivate_locked_super+0x94/0x160 fs/super.c:335
get_tree_bdev+0x573/0x760 fs/super.c:1297
vfs_get_tree+0x89/0x2f0 fs/super.c:1500
do_new_mount fs/namespace.c:2988 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3318
do_mount fs/namespace.c:3331 [inline]
__do_sys_mount fs/namespace.c:3539 [inline]
__se_sys_mount fs/namespace.c:3516 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fb2e2c3301a
RSP: 002b:00007fb2e0185fa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000740 RCX: 00007fb2e2c3301a
RDX: 0000000020000440 RSI: 0000000020000480 RDI: 00007fb2e0186000
RBP: 00007fb2e0186040 R08: 00007fb2e0186040 R09: 0000000020000440
R10: 0000000000210000 R11: 0000000000000202 R12: 0000000020000440
R13: 0000000020000480 R14: 00007fb2e0186000 R15: 0000000020000840
Showing all locks held in the system:
1 lock held by khungtaskd/26:
#0: ffffffff8bb80fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by systemd-udevd/2973:
#0: ffff88801ae7d118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
1 lock held by in:imklog/6222:
2 locks held by rs:main Q:Reg/6223:
#0: ffff888025677430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
#1: ffff88814ad84460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:643
1 lock held by systemd-udevd/13242:
#0: ffff88801ae7d118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
2 locks held by syz-executor.5/25105:
#0: ffff88801ae7d118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
#1: ffff88801ae78b60 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xc1d/0xf50 kernel/hung_task.c:295
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6223 Comm: rs:main Q:Reg Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__filemap_get_folio+0x43b/0xd60 mm/filemap.c:1911
Code: 84 24 e0 00 00 00 65 48 2b 04 25 28 00 00 00 0f 85 96 08 00 00 48 81 c4 e8 00 00 00 48 89 d8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 80 dd d9 ff 48 85 db 0f 84 64 fe ff ff e8 72 dd d9 ff 44 89 ed
RSP: 0018:ffffc9000c5e7868 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffea000164e640 RCX: ffff888077d62240
RDX: 0000000000000000 RSI: ffff888077d62240 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff819cf255 R11: 0000000000000000 R12: ffffea000164e674
R13: 000000000000020e R14: 0000000000000000 R15: dffffc0000000000
FS: 00007f16b7e28700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b36138000 CR3: 00000000210b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
pagecache_get_page+0x2c/0x1a0 mm/folio-compat.c:125
ext4_da_write_begin+0x3bc/0xad0 fs/ext4/inode.c:2958
generic_perform_write+0x205/0x510 mm/filemap.c:3756
ext4_buffered_write_iter+0x1ac/0x3b0 fs/ext4/file.c:269
ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:681
call_write_iter include/linux/fs.h:2162 [inline]
new_sync_write+0x429/0x660 fs/read_write.c:503
vfs_write+0x7cd/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f16ba86c1cd
Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f16b7e27590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f16ac0238a0 RCX: 00007f16ba86c1cd
RDX: 000000000000087e RSI: 00007f16ac0238a0 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f16ac023620
R13: 00007f16b7e275b0 R14: 000056170ac2b360 R15: 000000000000087e
----------------
Code disassembly (best guess):
0: 84 24 e0 test %ah,(%rax,%riz,8)
3: 00 00 add %al,(%rax)
5: 00 65 48 add %ah,0x48(%rbp)
8: 2b 04 25 28 00 00 00 sub 0x28,%eax
f: 0f 85 96 08 00 00 jne 0x8ab
15: 48 81 c4 e8 00 00 00 add $0xe8,%rsp
1c: 48 89 d8 mov %rbx,%rax
1f: 5b pop %rbx
20: 5d pop %rbp
21: 41 5c pop %r12
23: 41 5d pop %r13
25: 41 5e pop %r14
27: 41 5f pop %r15
29: c3 retq
* 2a: e8 80 dd d9 ff callq 0xffd9ddaf <-- trapping instruction
2f: 48 85 db test %rbx,%rbx
32: 0f 84 64 fe ff ff je 0xfffffe9c
38: e8 72 dd d9 ff callq 0xffd9ddaf
3d: 44 89 ed mov %r13d,%ebp