======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc3-next-20220829 #1 Not tainted
------------------------------------------------------
syz-executor.2/47949 is trying to acquire lock:
ffff88800bd40400 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_bmap+0x4e/0x470
but task is already holding lock:
ffff8880101703f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00
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_io_nested+0x148/0x1310
jbd2_journal_flush+0x19a/0xc00
__ext4_ioctl+0x30c7/0x4090
__x64_sys_ioctl+0x19a/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #2 (&journal->j_barrier){+.+.}-{3:3}:
__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
-> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}:
percpu_down_write+0x4d/0x3d0
ext4_ind_migrate+0x237/0x830
ext4_fileattr_set+0x1434/0x18a0
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
-> #0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}:
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
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
other info that might help us debug this:
Chain exists of:
&sb->s_type->i_mutex_key#6 --> &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#6);
*** DEADLOCK ***
2 locks held by syz-executor.2/47949:
#0: ffff888010170170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x15e/0x310
#1: ffff8880101703f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00
stack backtrace:
CPU: 1 PID: 47949 Comm: syz-executor.2 Not tainted 6.0.0-rc3-next-20220829 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack_lvl+0x8b/0xb3
check_noncircular+0x263/0x2e0
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
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
RIP: 0033:0x7f77960b4b19
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:00007f779362a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f77961c7f60 RCX: 00007f77960b4b19
RDX: 0000000020000240 RSI: 000000004004662b RDI: 0000000000000006
RBP: 00007f779610ef6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcc2ee6d0f R14: 00007f779362a300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 48210 Comm: syz-executor.4 Not tainted 6.0.0-rc3-next-20220829 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack_lvl+0x8b/0xb3
should_fail.cold+0x5/0xa
_copy_from_user+0x2a/0x170
snd_seq_ioctl+0x1b4/0x3f0
__x64_sys_ioctl+0x19a/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f85d97f9b19
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:00007f85d6d6f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f85d990cf60 RCX: 00007f85d97f9b19
RDX: 0000000020000040 RSI: 000000004040534e RDI: 0000000000000003
RBP: 00007f85d6d6f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc6d75de7f R14: 00007f85d6d6f300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 48322 Comm: syz-executor.4 Not tainted 6.0.0-rc3-next-20220829 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack_lvl+0x8b/0xb3
should_fail.cold+0x5/0xa
_copy_to_user+0x2a/0x140
simple_read_from_buffer+0xcc/0x160
proc_fail_nth_read+0x198/0x230
vfs_read+0x253/0x930
ksys_read+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f85d97ac69c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48
RSP: 002b:00007f85d6d6f170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f85d97ac69c
RDX: 000000000000000f RSI: 00007f85d6d6f1e0 RDI: 0000000000000004
RBP: 00007f85d6d6f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc6d75de7f R14: 00007f85d6d6f300 R15: 0000000000022000