warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow
======================================================
WARNING: possible circular locking dependency detected
6.2.0-syzkaller-13534-gb01fe98d34f3 #0 Not tainted
------------------------------------------------------
syz-executor.0/32133 is trying to acquire lock:
ffff88801fc0f440 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline]
ffff88801fc0f440 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_bmap+0x52/0x470 fs/ext4/inode.c:3242
but task is already holding lock:
ffff8880245843f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x47f/0xc90 fs/jbd2/journal.c:2473
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&journal->j_checkpoint_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
mutex_lock_io_nested+0x143/0x11a0 kernel/locking/mutex.c:833
jbd2_journal_flush+0x19e/0xc90 fs/jbd2/journal.c:2463
ext4_ioctl_checkpoint fs/ext4/ioctl.c:1079 [inline]
__ext4_ioctl+0xb3f/0x4c90 fs/ext4/ioctl.c:1587
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #2 (&journal->j_barrier){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747
jbd2_journal_lock_updates+0x162/0x310 fs/jbd2/transaction.c:904
ext4_change_inode_journal_flag+0x188/0x550 fs/ext4/inode.c:6156
ext4_ioctl_setflags fs/ext4/ioctl.c:684 [inline]
ext4_fileattr_set+0xe78/0x1a50 fs/ext4/ioctl.c:1001
vfs_fileattr_set+0x7ff/0xc40 fs/ioctl.c:696
ioctl_fssetxattr fs/ioctl.c:758 [inline]
do_vfs_ioctl+0xfa8/0x1670 fs/ioctl.c:845
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x10c/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
ext4_writepages+0x1a9/0x5e0 fs/ext4/inode.c:2963
do_writepages+0x1a8/0x640 mm/page-writeback.c:2551
filemap_fdatawrite_wbc mm/filemap.c:390 [inline]
filemap_fdatawrite_wbc+0x147/0x1b0 mm/filemap.c:380
__filemap_fdatawrite_range+0xb8/0xf0 mm/filemap.c:423
filemap_write_and_wait_range mm/filemap.c:678 [inline]
filemap_write_and_wait_range+0xa1/0x120 mm/filemap.c:669
__iomap_dio_rw+0x5ea/0x1d80 fs/iomap/direct-io.c:566
iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:683
ext4_dio_write_iter fs/ext4/file.c:597 [inline]
ext4_file_write_iter+0x94a/0x1740 fs/ext4/file.c:708
call_write_iter include/linux/fs.h:1851 [inline]
do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
do_iter_write+0x182/0x700 fs/read_write.c:861
vfs_iter_write+0x74/0xa0 fs/read_write.c:902
iter_file_splice_write+0x743/0xc80 fs/splice.c:778
do_splice_from fs/splice.c:856 [inline]
direct_splice_actor+0x114/0x180 fs/splice.c:1023
splice_direct_to_actor+0x335/0x8a0 fs/splice.c:978
do_splice_direct+0x1ab/0x280 fs/splice.c:1066
do_sendfile+0xb19/0x12c0 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1323 [inline]
__se_sys_sendfile64 fs/read_write.c:1309 [inline]
__x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1309
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
lock_acquire kernel/locking/lockdep.c:5669 [inline]
lock_acquire+0x1e3/0x670 kernel/locking/lockdep.c:5634
down_read+0x3d/0x50 kernel/locking/rwsem.c:1520
inode_lock_shared include/linux/fs.h:768 [inline]
ext4_bmap+0x52/0x470 fs/ext4/inode.c:3242
bmap+0xae/0x120 fs/inode.c:1799
jbd2_journal_bmap+0xac/0x1c0 fs/jbd2/journal.c:976
__jbd2_journal_erase fs/jbd2/journal.c:1788 [inline]
jbd2_journal_flush+0x87b/0xc90 fs/jbd2/journal.c:2491
ext4_ioctl_checkpoint fs/ext4/ioctl.c:1079 [inline]
__ext4_ioctl+0xb3f/0x4c90 fs/ext4/ioctl.c:1587
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that might help us debug this:
Chain exists of:
&sb->s_type->i_mutex_key#7 --> &journal->j_barrier --> &journal->j_checkpoint_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&journal->j_checkpoint_mutex);
lock(&journal->j_barrier);
lock(&journal->j_checkpoint_mutex);
lock(&sb->s_type->i_mutex_key#7);
*** DEADLOCK ***
2 locks held by syz-executor.0/32133:
#0: ffff888024584170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310 fs/jbd2/transaction.c:904
#1: ffff8880245843f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x47f/0xc90 fs/jbd2/journal.c:2473
stack backtrace:
CPU: 1 PID: 32133 Comm: syz-executor.0 Not tainted 6.2.0-syzkaller-13534-gb01fe98d34f3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
lock_acquire kernel/locking/lockdep.c:5669 [inline]
lock_acquire+0x1e3/0x670 kernel/locking/lockdep.c:5634
down_read+0x3d/0x50 kernel/locking/rwsem.c:1520
inode_lock_shared include/linux/fs.h:768 [inline]
ext4_bmap+0x52/0x470 fs/ext4/inode.c:3242
bmap+0xae/0x120 fs/inode.c:1799
jbd2_journal_bmap+0xac/0x1c0 fs/jbd2/journal.c:976
__jbd2_journal_erase fs/jbd2/journal.c:1788 [inline]
jbd2_journal_flush+0x87b/0xc90 fs/jbd2/journal.c:2491
ext4_ioctl_checkpoint fs/ext4/ioctl.c:1079 [inline]
__ext4_ioctl+0xb3f/0x4c90 fs/ext4/ioctl.c:1587
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fec4a88c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fec4b514168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fec4a9ac050 RCX: 00007fec4a88c0f9
RDX: 0000000020000000 RSI: 000000004004662b RDI: 0000000000000005
RBP: 00007fec4a8e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffed602bc3f R14: 00007fec4b514300 R15: 0000000000022000
</TASK>