======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc2-next-20220823 #1 Not tainted
------------------------------------------------------
syz-executor.6/8805 is trying to acquire lock:
ffff88800f874170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x15e/0x310
but task is already holding lock:
ffff88800fde6bd0 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x177/0x530
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&sbi->s_writepages_rwsem){++++}-{0:0}:
ext4_writepages+0x1d2/0x3690
do_writepages+0x1b0/0x6a0
filemap_fdatawrite_wbc+0x147/0x1b0
__filemap_fdatawrite_range+0xb6/0x100
filemap_write_and_wait_range+0x89/0x110
ext4_bmap+0x2a5/0x470
bmap+0xac/0x120
do_vfs_ioctl+0xe5f/0x1610
__x64_sys_ioctl+0x10c/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #2 (&sb->s_type->i_mutex_key#6){++++}-{3:3}:
down_read+0x98/0x450
ext4_bmap+0x4e/0x470
bmap+0xac/0x120
jbd2_journal_bmap+0xa8/0x180
jbd2_journal_flush+0x853/0xc00
__ext4_ioctl+0x9e9/0x4090
__x64_sys_ioctl+0x19a/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}:
mutex_lock_io_nested+0x148/0x1310
jbd2_journal_flush+0x19a/0xc00
__ext4_ioctl+0x9e9/0x4090
__x64_sys_ioctl+0x19a/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&journal->j_barrier){+.+.}-{3:3}:
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
__mutex_lock+0x136/0x14d0
jbd2_journal_lock_updates+0x15e/0x310
ext4_change_inode_journal_flag+0x17f/0x530
ext4_fileattr_set+0x140d/0x18a0
vfs_fileattr_set+0x77c/0xb80
do_vfs_ioctl+0xfc2/0x1610
__x64_sys_ioctl+0x10c/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that might help us debug this:
Chain exists of:
&journal->j_barrier --> &sb->s_type->i_mutex_key#6 --> &sbi->s_writepages_rwsem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sbi->s_writepages_rwsem);
lock(&sb->s_type->i_mutex_key#6);
lock(&sbi->s_writepages_rwsem);
lock(&journal->j_barrier);
*** DEADLOCK ***
4 locks held by syz-executor.6/8805:
#0: ffff88800fde4438 (sb_writers#3){.+.+}-{0:0}, at: do_vfs_ioctl+0xf87/0x1610
#1: ffff88801e707150 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_fileattr_set+0x148/0xb80
#2: ffff88801e7072f0 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x11e/0x530
#3: ffff88800fde6bd0 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x177/0x530
stack backtrace:
CPU: 1 PID: 8805 Comm: syz-executor.6 Not tainted 6.0.0-rc2-next-20220823 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x8b/0xb3
check_noncircular+0x263/0x2e0
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
__mutex_lock+0x136/0x14d0
jbd2_journal_lock_updates+0x15e/0x310
ext4_change_inode_journal_flag+0x17f/0x530
ext4_fileattr_set+0x140d/0x18a0
vfs_fileattr_set+0x77c/0xb80
do_vfs_ioctl+0xfc2/0x1610
__x64_sys_ioctl+0x10c/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4911aa1b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f490f017188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4911bb4f60 RCX: 00007f4911aa1b19
RDX: 0000000020000080 RSI: 0000000040086602 RDI: 0000000000000005
RBP: 00007f4911afbf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffff396ca0f R14: 00007f490f017300 R15: 0000000000022000
</TASK>
audit: type=1326 audit(1661253948.472:27): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8998 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb953f49b19 code=0x0
audit: type=1326 audit(1661253949.299:28): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8998 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb953f49b19 code=0x0
audit: type=1326 audit(1661253949.697:29): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=9051 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb953f49b19 code=0x0
audit: type=1326 audit(1661253951.654:30): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=9092 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb953f49b19 code=0x0
audit: type=1326 audit(1661253952.683:31): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=9121 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb953f49b19 code=0x0