UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=62, location=62
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=61, location=61
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=60, location=60
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=512, location=512
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.4125/20205 is trying to acquire lock:
ffff888148d2e3b0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
ffff888148d2e3b0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: set_blocksize+0x201/0x4b0 block/bdev.c:160
but task is already holding lock:
ffff88802c9980e0 (&type->s_umount_key#103){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
ffff88802c9980e0 (&type->s_umount_key#103){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
ffff88802c9980e0 (&type->s_umount_key#103){++++}-{3:3}, at: mount_bdev+0x1e8/0x2d0 fs/super.c:1641
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&type->s_umount_key#103){++++}-{3:3}:
down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
__super_lock fs/super.c:58 [inline]
super_lock+0x167/0x360 fs/super.c:117
super_lock_shared fs/super.c:146 [inline]
super_lock_shared_active fs/super.c:1442 [inline]
fs_bdev_mark_dead+0xad/0x1f0 fs/super.c:1458
bdev_mark_dead+0x83/0x1a0 block/bdev.c:1030
disk_force_media_change+0x132/0x1b0 block/disk-events.c:302
nbd_clear_sock_ioctl drivers/block/nbd.c:1483 [inline]
__nbd_ioctl drivers/block/nbd.c:1510 [inline]
nbd_ioctl+0x431/0xed0 drivers/block/nbd.c:1570
blkdev_ioctl+0x58b/0x6f0 block/ioctl.c:639
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #3 (&bdev->bd_holder_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747
bd_finish_claiming+0x22f/0x3f0 block/bdev.c:585
blkdev_get_by_dev+0x45c/0x600 block/bdev.c:818
bdev_open_by_dev+0x77/0x100 block/bdev.c:859
setup_bdev_super+0x59/0x660 fs/super.c:1496
mount_bdev+0x1dd/0x2d0 fs/super.c:1640
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
init_mount+0xd2/0x120 fs/init.c:25
do_mount_root+0x97/0x230 init/do_mounts.c:166
mount_root_generic+0x195/0x3c0 init/do_mounts.c:205
prepare_namespace+0xc2/0x100 init/do_mounts.c:489
kernel_init_freeable+0x413/0x570 init/main.c:1578
kernel_init+0x1d/0x1c0 init/main.c:1455
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
-> #2 (bdev_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747
bd_prepare_to_claim+0x1ba/0x480 block/bdev.c:527
truncate_bdev_range+0x4e/0x260 block/bdev.c:105
blkdev_fallocate+0x428/0x6a0 block/fops.c:807
vfs_fallocate+0x58e/0x700 fs/open.c:324
madvise_remove mm/madvise.c:1007 [inline]
madvise_vma_behavior mm/madvise.c:1031 [inline]
madvise_walk_vmas mm/madvise.c:1266 [inline]
do_madvise+0x15fe/0x3710 mm/madvise.c:1446
__do_sys_madvise mm/madvise.c:1459 [inline]
__se_sys_madvise mm/madvise.c:1457 [inline]
__x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1457
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #1 (mapping.invalidate_lock){++++}-{3:3}:
down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573
filemap_invalidate_lock include/linux/fs.h:849 [inline]
set_blocksize+0x249/0x4b0 block/bdev.c:161
sb_set_blocksize block/bdev.c:178 [inline]
sb_min_blocksize+0xbe/0x190 block/bdev.c:194
ext4_load_super fs/ext4/super.c:5042 [inline]
__ext4_fill_super fs/ext4/super.c:5251 [inline]
ext4_fill_super+0x6df/0x66c0 fs/ext4/super.c:5724
get_tree_bdev+0x3e4/0x510 fs/super.c:1591
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
init_mount+0xd2/0x120 fs/init.c:25
do_mount_root+0x97/0x230 init/do_mounts.c:166
mount_root_generic+0x195/0x3c0 init/do_mounts.c:205
prepare_namespace+0xc2/0x100 init/do_mounts.c:489
kernel_init_freeable+0x413/0x570 init/main.c:1578
kernel_init+0x1d/0x1c0 init/main.c:1455
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
-> #0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573
inode_lock include/linux/fs.h:804 [inline]
set_blocksize+0x201/0x4b0 block/bdev.c:160
sb_set_blocksize+0x4a/0x100 block/bdev.c:178
udf_load_vrs+0xe3/0xf00 fs/udf/super.c:1968
udf_fill_super+0x67d/0x1720 fs/udf/super.c:2172
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
other info that might help us debug this:
Chain exists of:
&sb->s_type->i_mutex_key#8 --> &bdev->bd_holder_lock --> &type->s_umount_key#103
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&type->s_umount_key#103);
lock(&bdev->bd_holder_lock);
lock(&type->s_umount_key#103);
lock(&sb->s_type->i_mutex_key#8);
*** DEADLOCK ***
1 lock held by syz.0.4125/20205:
#0: ffff88802c9980e0 (&type->s_umount_key#103){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88802c9980e0 (&type->s_umount_key#103){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88802c9980e0 (&type->s_umount_key#103){++++}-{3:3}, at: mount_bdev+0x1e8/0x2d0 fs/super.c:1641
stack backtrace:
CPU: 1 PID: 20205 Comm: syz.0.4125 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573
inode_lock include/linux/fs.h:804 [inline]
set_blocksize+0x201/0x4b0 block/bdev.c:160
sb_set_blocksize+0x4a/0x100 block/bdev.c:178
udf_load_vrs+0xe3/0xf00 fs/udf/super.c:1968
udf_fill_super+0x67d/0x1720 fs/udf/super.c:2172
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f073d78efc9
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:00007f073e6db038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f073d9e5fa0 RCX: 00007f073d78efc9
RDX: 0000200000000080 RSI: 0000200000004a00 RDI: 0000200000000000
RBP: 00007f073d811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002008087 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f073d9e6038 R14: 00007f073d9e5fa0 R15: 00007ffe902663f8
</TASK>
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=256, location=256
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=30, location=30
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=29, location=29
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=28, location=28
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=512, location=512
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=256, location=256
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=14, location=14
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=13, location=13
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=12, location=12
UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=512, location=512
UDF-fs: warning (device nbd0): udf_fill_super: No partition found (1)