warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow ====================================================== WARNING: possible circular locking dependency detected 5.15.102-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor420/3584 is trying to acquire lock: ffff888024efe170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x4a9/0x580 fs/jbd2/transaction.c:895 but task is already holding lock: ffff888024efcbd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x1a0/0x6e0 fs/ext4/inode.c:6025 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&sbi->s_writepages_rwsem){++++}-{0:0}: lock_acquire+0x1ff/0x570 kernel/locking/lockdep.c:5622 percpu_down_write+0x52/0x2d0 kernel/locking/percpu-rwsem.c:217 ext4_change_inode_journal_flag+0x1a0/0x6e0 fs/ext4/inode.c:6025 ext4_ioctl_setflags fs/ext4/ioctl.c:447 [inline] ext4_fileattr_set+0xe6e/0x17d0 fs/ext4/ioctl.c:762 vfs_fileattr_set+0x8f3/0xd30 fs/ioctl.c:700 ioctl_setflags fs/ioctl.c:732 [inline] do_vfs_ioctl+0x1d85/0x2b70 fs/ioctl.c:843 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #3 (mapping.invalidate_lock){++++}-{3:3}: lock_acquire+0x1ff/0x570 kernel/locking/lockdep.c:5622 down_write+0x97/0x170 kernel/locking/rwsem.c:1541 filemap_invalidate_lock include/linux/fs.h:832 [inline] ext4_setattr+0xdaa/0x1990 fs/ext4/inode.c:5443 notify_change+0xdad/0x1060 fs/attr.c:426 do_truncate+0x217/0x300 fs/open.c:65 do_sys_ftruncate+0x2eb/0x390 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #2 (&sb->s_type->i_mutex_key#9){++++}-{3:3}: lock_acquire+0x1ff/0x570 kernel/locking/lockdep.c:5622 down_read+0x3b/0x50 kernel/locking/rwsem.c:1488 inode_lock_shared include/linux/fs.h:797 [inline] ext4_bmap+0x4b/0x410 fs/ext4/inode.c:3159 bmap+0xa1/0xd0 fs/inode.c:1714 jbd2_journal_bmap fs/jbd2/journal.c:978 [inline] __jbd2_journal_erase fs/jbd2/journal.c:1786 [inline] jbd2_journal_flush+0x7a2/0xc90 fs/jbd2/journal.c:2492 ext4_ioctl_checkpoint fs/ext4/ioctl.c:847 [inline] __ext4_ioctl fs/ext4/ioctl.c:1265 [inline] ext4_ioctl+0x336b/0x5e10 fs/ext4/ioctl.c:1277 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: lock_acquire+0x1ff/0x570 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 mutex_lock_io_nested+0x45/0x60 kernel/locking/mutex.c:777 jbd2_journal_flush+0x290/0xc90 fs/jbd2/journal.c:2464 ext4_ioctl_checkpoint fs/ext4/ioctl.c:847 [inline] __ext4_ioctl fs/ext4/ioctl.c:1265 [inline] ext4_ioctl+0x336b/0x5e10 fs/ext4/ioctl.c:1277 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #0 (&journal->j_barrier){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1ff/0x570 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 jbd2_journal_lock_updates+0x4a9/0x580 fs/jbd2/transaction.c:895 ext4_change_inode_journal_flag+0x1a8/0x6e0 fs/ext4/inode.c:6026 ext4_ioctl_setflags fs/ext4/ioctl.c:447 [inline] ext4_fileattr_set+0xe6e/0x17d0 fs/ext4/ioctl.c:762 vfs_fileattr_set+0x8f3/0xd30 fs/ioctl.c:700 ioctl_setflags fs/ioctl.c:732 [inline] do_vfs_ioctl+0x1d85/0x2b70 fs/ioctl.c:843 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb other info that might help us debug this: Chain exists of: &journal->j_barrier --> mapping.invalidate_lock --> &sbi->s_writepages_rwsem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_writepages_rwsem); lock(mapping.invalidate_lock); lock(&sbi->s_writepages_rwsem); lock(&journal->j_barrier); *** DEADLOCK *** 4 locks held by syz-executor420/3584: #0: ffff888024efa460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:421 #1: ffff8880759fdda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff8880759fdda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_fileattr_set+0x135/0xd30 fs/ioctl.c:685 #2: ffff8880759fdf48 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline] #2: ffff8880759fdf48 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x115/0x6e0 fs/ext4/inode.c:6017 #3: ffff888024efcbd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x1a0/0x6e0 fs/ext4/inode.c:6025 stack backtrace: CPU: 1 PID: 3584 Comm: syz-executor420 Not tainted 5.15.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1ff/0x570 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 jbd2_journal_lock_updates+0x4a9/0x580 fs/jbd2/transaction.c:895 ext4_change_inode_journal_flag+0x1a8/0x6e0 fs/ext4/inode.c:6026 ext4_ioctl_setflags fs/ext4/ioctl.c:447 [inline] ext4_fileattr_set+0xe6e/0x17d0 fs/ext4/ioctl.c:762 vfs_fileattr_set+0x8f3/0xd30 fs/ioctl.c:700 ioctl_setflags fs/ioctl.c:732 [inline] do_vfs_ioctl+0x1d85/0x2b70 fs/ioctl.c:843 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fc9971e9049 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 RSP: 002b:00007ffeb9a06d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc9971e9049 RDX: 00000000200001c0 RSI: 0000000040086602 RDI: 0000000000000004 RBP: 00007fc9971ad030