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.3/6803 is trying to acquire lock:
ffff88801c698400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline]
ffff88801c698400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_bmap+0x52/0x470 fs/ext4/inode.c:3242
but task is already holding lock:
ffff88804846a3f8 (&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_change_inode_journal_flag+0x397/0x550 fs/ext4/inode.c:6169
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_compat_sys_ioctl+0x131/0x2b0 fs/ioctl.c:962
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
-> #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_compat_sys_ioctl+0x131/0x2b0 fs/ioctl.c:962
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
-> #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_read_iter fs/ext4/file.c:94 [inline]
ext4_file_read_iter+0x4be/0x690 fs/ext4/file.c:145
call_read_iter include/linux/fs.h:1845 [inline]
generic_file_splice_read+0x182/0x4b0 fs/splice.c:402
do_splice_to+0x1b9/0x240 fs/splice.c:885
splice_direct_to_actor+0x2ab/0x8a0 fs/splice.c:957
do_splice_direct+0x1ab/0x280 fs/splice.c:1066
do_sendfile+0xb19/0x12c0 fs/read_write.c:1255
__do_compat_sys_sendfile fs/read_write.c:1344 [inline]
__se_compat_sys_sendfile fs/read_write.c:1327 [inline]
__ia32_compat_sys_sendfile+0x1e1/0x220 fs/read_write.c:1327
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
-> #0 (&sb->s_type->i_mutex_key#8){++++}-{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
ext4_ioctl fs/ext4/ioctl.c:1607 [inline]
ext4_compat_ioctl+0xca/0x430 fs/ext4/ioctl.c:1683
__do_compat_sys_ioctl+0x255/0x2b0 fs/ioctl.c:968
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
other info that might help us debug this:
Chain exists of:
&sb->s_type->i_mutex_key#8 --> &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#8);
*** DEADLOCK ***
2 locks held by syz-executor.3/6803:
#0: ffff88804846a170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310 fs/jbd2/transaction.c:904
#1: ffff88804846a3f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x47f/0xc90 fs/jbd2/journal.c:2473
stack backtrace:
CPU: 3 PID: 6803 Comm: syz-executor.3 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
ext4_ioctl fs/ext4/ioctl.c:1607 [inline]
ext4_compat_ioctl+0xca/0x430 fs/ext4/ioctl.c:1683
__do_compat_sys_ioctl+0x255/0x2b0 fs/ioctl.c:968
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7f2a579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7f255cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000004004662b
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 retq
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi