warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow ====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc8-syzkaller-00014-g8ed710da2873 #0 Not tainted ------------------------------------------------------ syz-executor669/3633 is trying to acquire lock: ffff888140ddd440 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:766 [inline] ffff888140ddd440 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_bmap+0x52/0x470 fs/ext4/inode.c:3164 but task is already holding lock: ffff88814b5a83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00 fs/jbd2/journal.c:2474 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/0xc00 fs/jbd2/journal.c:2464 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1081 [inline] __ext4_ioctl+0xb09/0x4a30 fs/ext4/ioctl.c:1586 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/0x1360 kernel/locking/mutex.c:747 jbd2_journal_lock_updates+0x162/0x310 fs/jbd2/transaction.c:904 ext4_change_inode_journal_flag+0x184/0x530 fs/ext4/inode.c:6058 ext4_ioctl_setflags fs/ext4/ioctl.c:686 [inline] ext4_fileattr_set+0xdf0/0x1950 fs/ext4/ioctl.c:1003 vfs_fileattr_set+0x7f9/0xbe0 fs/ioctl.c:696 ioctl_fssetxattr fs/ioctl.c:758 [inline] do_vfs_ioctl+0xfa8/0x1600 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_write+0x53/0x390 kernel/locking/percpu-rwsem.c:227 ext4_ind_migrate+0x23b/0x850 fs/ext4/migrate.c:624 ext4_ioctl_setflags fs/ext4/ioctl.c:695 [inline] ext4_fileattr_set+0x14d6/0x1950 fs/ext4/ioctl.c:1003 vfs_fileattr_set+0x7f9/0xbe0 fs/ioctl.c:696 ioctl_fssetxattr fs/ioctl.c:758 [inline] do_vfs_ioctl+0xfa8/0x1600 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 -> #0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 down_read+0x9c/0x450 kernel/locking/rwsem.c:1509 inode_lock_shared include/linux/fs.h:766 [inline] ext4_bmap+0x52/0x470 fs/ext4/inode.c:3164 bmap+0xae/0x120 fs/inode.c:1798 jbd2_journal_bmap+0xac/0x180 fs/jbd2/journal.c:977 __jbd2_journal_erase fs/jbd2/journal.c:1789 [inline] jbd2_journal_flush+0x853/0xc00 fs/jbd2/journal.c:2492 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1081 [inline] __ext4_ioctl+0xb09/0x4a30 fs/ext4/ioctl.c:1586 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-executor669/3633: #0: ffff88814b5a8170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310 fs/jbd2/transaction.c:904 #1: ffff88814b5a83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00 fs/jbd2/journal.c:2474 stack backtrace: CPU: 1 PID: 3633 Comm: syz-executor669 Not tainted 6.1.0-rc8-syzkaller-00014-g8ed710da2873 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 down_read+0x9c/0x450 kernel/locking/rwsem.c:1509 inode_lock_shared include/linux/fs.h:766 [inline] ext4_bmap+0x52/0x470 fs/ext4/inode.c:3164 bmap+0xae/0x120 fs/inode.c:1798 jbd2_journal_bmap+0xac/0x180 fs/jbd2/journal.c:977 __jbd2_journal_erase fs/jbd2/journal.c:1789 [inline] jbd2_journal_flush+0x853/0xc00 fs/jbd2/journal.c:2492 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1081 [inline] __ext4_ioctl+0xb09/0x4a30 fs/ext4/ioctl.c:1586 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: 0033:0x7f9e0dd5fb69 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48