loop0: detected capacity change from 0 to 8192
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc2-syzkaller-00130-g150b567e0d57 #0 Not tainted
------------------------------------------------------
syz.0.3077/15054 is trying to acquire lock:
ffff8880579fe0c0 (&sb->s_type->i_mutex_key#21){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]
ffff8880579fe0c0 (&sb->s_type->i_mutex_key#21){++++}-{4:4}, at: __generic_file_fsync+0x97/0x1a0 fs/libfs.c:1536
but task is already holding lock:
ffff88802504f608 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&q->q_usage_counter(io)#26){++++}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
bio_queue_enter block/blk.h:75 [inline]
blk_mq_submit_bio+0x1536/0x2390 block/blk-mq.c:3092
__submit_bio+0x2c6/0x560 block/blk-core.c:629
__submit_bio_noacct_mq block/blk-core.c:710 [inline]
submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739
ext4_read_block_bitmap_nowait+0x7c5/0xa80 fs/ext4/balloc.c:551
ext4_mb_prefetch+0x240/0x380 fs/ext4/mballoc.c:2749
ext4_mb_regular_allocator+0xb44/0x3bb0 fs/ext4/mballoc.c:2898
ext4_mb_new_blocks+0x10a8/0x4e00 fs/ext4/mballoc.c:6217
ext4_ext_map_blocks+0x1be0/0x7d30 fs/ext4/extents.c:4379
ext4_map_create_blocks fs/ext4/inode.c:516 [inline]
ext4_map_blocks+0x8bf/0x1990 fs/ext4/inode.c:702
ext4_iomap_alloc fs/ext4/inode.c:3376 [inline]
ext4_iomap_begin+0x8e6/0xd30 fs/ext4/inode.c:3426
iomap_iter+0x699/0xf60 fs/iomap/iter.c:90
__iomap_dio_rw+0xeb9/0x25b0 fs/iomap/direct-io.c:702
iomap_dio_rw+0x46/0xa0 fs/iomap/direct-io.c:792
ext4_dio_write_iter fs/ext4/file.c:575 [inline]
ext4_file_write_iter+0x17aa/0x1c50 fs/ext4/file.c:715
do_iter_readv_writev+0x602/0x880
vfs_writev+0x376/0xba0 fs/read_write.c:1050
do_pwritev fs/read_write.c:1146 [inline]
__do_sys_pwritev2 fs/read_write.c:1204 [inline]
__se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (&ei->i_data_sem){++++}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
ext4_map_blocks+0x7a6/0x1990 fs/ext4/inode.c:701
mpage_map_one_extent fs/ext4/inode.c:2219 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2272 [inline]
ext4_do_writepages+0x21c7/0x3df0 fs/ext4/inode.c:2735
ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2824
do_writepages+0x361/0x880 mm/page-writeback.c:2702
__writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1680
writeback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2047
wb_writeback+0x427/0xb80 fs/fs-writeback.c:2158
wb_check_background_flush fs/fs-writeback.c:2228 [inline]
wb_do_writeback fs/fs-writeback.c:2316 [inline]
wb_workfn+0xc4b/0x1080 fs/fs-writeback.c:2343
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #2 (jbd2_handle){++++}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
start_this_handle+0x1eb4/0x2110 fs/jbd2/transaction.c:448
jbd2__journal_start+0x2da/0x5d0 fs/jbd2/transaction.c:505
__ext4_journal_start_sb+0x239/0x600 fs/ext4/ext4_jbd2.c:112
__ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
ext4_dirty_inode+0x92/0x110 fs/ext4/inode.c:6038
__mark_inode_dirty+0x2f0/0xe90 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2112 [inline]
inode_update_time fs/inode.c:2125 [inline]
touch_atime+0x413/0x690 fs/inode.c:2197
file_accessed include/linux/fs.h:2539 [inline]
ext4_file_mmap+0x18c/0x540 fs/ext4/file.c:816
call_mmap include/linux/fs.h:2183 [inline]
mmap_file mm/internal.h:124 [inline]
__mmap_new_file_vma mm/vma.c:2291 [inline]
__mmap_new_vma mm/vma.c:2355 [inline]
__mmap_region+0x2206/0x2cd0 mm/vma.c:2456
mmap_region+0x226/0x2c0 mm/mmap.c:1348
do_mmap+0x8f0/0x1000 mm/mmap.c:496
vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:580
ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&mm->mmap_lock){++++}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
gup_fast_fallback+0x25f/0x29c0 mm/gup.c:3416
pin_user_pages_fast+0xcc/0x160 mm/gup.c:3540
iov_iter_extract_user_pages lib/iov_iter.c:1844 [inline]
iov_iter_extract_pages+0x3bb/0x5c0 lib/iov_iter.c:1907
dio_refill_pages fs/direct-io.c:172 [inline]
dio_get_page fs/direct-io.c:213 [inline]
do_direct_IO fs/direct-io.c:915 [inline]
__blockdev_direct_IO+0x1443/0x4890 fs/direct-io.c:1243
blockdev_direct_IO include/linux/fs.h:3313 [inline]
fat_direct_IO+0x1ba/0x300 fs/fat/inode.c:281
generic_file_direct_write+0x1e8/0x400 mm/filemap.c:3978
__generic_file_write_iter+0x126/0x230 mm/filemap.c:4142
generic_file_write_iter+0xae/0x310 mm/filemap.c:4182
aio_write+0x56d/0x7c0 fs/aio.c:1633
io_submit_one+0x8a7/0x18a0 fs/aio.c:2052
__do_sys_io_submit fs/aio.c:2111 [inline]
__se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&sb->s_type->i_mutex_key#21){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:818 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1536
fat_file_fsync+0x7b/0x190 fs/fat/file.c:191
__loop_update_dio+0x1a4/0x500 drivers/block/loop.c:204
loop_set_status+0x62b/0x8f0 drivers/block/loop.c:1289
lo_ioctl+0xcbc/0x1f50
blkdev_ioctl+0x57f/0x6a0 block/ioctl.c:693
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&sb->s_type->i_mutex_key#21 --> &ei->i_data_sem --> &q->q_usage_counter(io)#26
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&q->q_usage_counter(io)#26);
lock(&ei->i_data_sem);
lock(&q->q_usage_counter(io)#26);
lock(&sb->s_type->i_mutex_key#21);
*** DEADLOCK ***
3 locks held by syz.0.3077/15054:
#0: ffff8880251a3b60 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0x2a/0x8f0 drivers/block/loop.c:1251
#1: ffff88802504f608 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267
#2: ffff88802504f640 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267
stack backtrace:
CPU: 1 UID: 0 PID: 15054 Comm: syz.0.3077 Not tainted 6.13.0-rc2-syzkaller-00130-g150b567e0d57 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:818 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1536
fat_file_fsync+0x7b/0x190 fs/fat/file.c:191
__loop_update_dio+0x1a4/0x500 drivers/block/loop.c:204
loop_set_status+0x62b/0x8f0 drivers/block/loop.c:1289
lo_ioctl+0xcbc/0x1f50
blkdev_ioctl+0x57f/0x6a0 block/ioctl.c:693
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3ecb985d19
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:00007f3ecc70a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3ecbb75fa0 RCX: 00007f3ecb985d19
RDX: 0000000020000480 RSI: 0000000000004c02 RDI: 0000000000000004
RBP: 00007f3ecba01a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3ecbb75fa0 R15: 00007fff8fdad7f8
</TASK>