warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow
======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc1-next-20220822 #1 Not tainted
------------------------------------------------------
syz-executor.3/4332 is trying to acquire lock:
ffff88800c9a0400 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_bmap+0x4e/0x470
but task is already holding lock:
ffff88800ff283f8 (&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+0x9e9/0x4090
__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.3/4332:
#0: ffff88800ff28170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x15e/0x310
#1: ffff88800ff283f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00
stack backtrace:
CPU: 0 PID: 4332 Comm: syz-executor.3 Not tainted 6.0.0-rc1-next-20220822 #1
BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1521
in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 4332, name: syz-executor.3
preempt_count: 0, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
irq event stamp: 3669
hardirqs last enabled at (3669): [<ffffffff812051bd>] finish_task_switch.isra.0+0x22d/0x8a0
hardirqs last disabled at (3668): [<ffffffff841ece67>] __schedule+0x11d7/0x2490
softirqs last enabled at (3568): [<ffffffff8116ca6b>] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (3545): [<ffffffff8116ca6b>] __irq_exit_rcu+0x11b/0x180
CPU: 0 PID: 4332 Comm: syz-executor.3 Not tainted 6.0.0-rc1-next-20220822 #1
syz-executor.3[4332] cmdline: /syz-executor.3 exec
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
__might_resched.cold+0x222/0x26b
down_read_killable+0x75/0x490
__access_remote_vm+0xac/0x6f0
get_mm_cmdline.part.0+0x214/0x600
get_task_cmdline_kernel+0x1e9/0x230
dump_stack_print_cmdline.part.0+0x82/0x150
dump_stack_print_info+0x185/0x190
dump_stack_lvl+0x7f/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: 0033:0x7f6dcddd2b19
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:00007f6dcb348188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6dcdee5f60 RCX: 00007f6dcddd2b19
RDX: 0000000020000340 RSI: 000000004004662b RDI: 0000000000000003
RBP: 00007f6dcde2cf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc31837ebf R14: 00007f6dcb348300 R15: 0000000000022000
</TASK>
syz-executor.3[4332] cmdline: /syz-executor.3 exec
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
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: 0033:0x7f6dcddd2b19
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:00007f6dcb348188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6dcdee5f60 RCX: 00007f6dcddd2b19
RDX: 0000000020000340 RSI: 000000004004662b RDI: 0000000000000003
RBP: 00007f6dcde2cf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc31837ebf R14: 00007f6dcb348300 R15: 0000000000022000
</TASK>