====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc2-syzkaller-00405-ga3671bd86a97 #0 Not tainted ------------------------------------------------------ syz-executor.0/25916 is trying to acquire lock: ffff88802909f0e0 (&ei->i_data_sem/1){+.+.}-{3:3}, at: ext4_double_down_write_data_sem fs/ext4/move_extent.c:55 [inline] ffff88802909f0e0 (&ei->i_data_sem/1){+.+.}-{3:3}, at: ext4_double_down_write_data_sem fs/ext4/move_extent.c:51 [inline] ffff88802909f0e0 (&ei->i_data_sem/1){+.+.}-{3:3}, at: ext4_move_extents+0x3b1/0x4690 fs/ext4/move_extent.c:620 but task is already holding lock: ffff88801c3ed2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem fs/ext4/move_extent.c:54 [inline] ffff88801c3ed2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem fs/ext4/move_extent.c:51 [inline] ffff88801c3ed2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_move_extents+0x3a4/0x4690 fs/ext4/move_extent.c:620 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->i_data_sem/2){++++}-{3:3}: down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574 ext4_getblk+0x16b/0x850 fs/ext4/inode.c:863 ext4_bread+0x2e/0x190 fs/ext4/inode.c:919 ext4_quota_read+0x249/0x330 fs/ext4/super.c:7089 find_tree_dqentry+0x7b/0x7f0 fs/quota/quota_tree.c:624 find_tree_dqentry+0x598/0x7f0 fs/quota/quota_tree.c:640 find_tree_dqentry+0x598/0x7f0 fs/quota/quota_tree.c:640 find_tree_dqentry+0x598/0x7f0 fs/quota/quota_tree.c:640 find_dqentry fs/quota/quota_tree.c:652 [inline] qtree_read_dquot+0x362/0x760 fs/quota/quota_tree.c:672 v2_read_dquot+0xd2/0x120 fs/quota/quota_v2.c:333 dquot_acquire+0x1b3/0x6c0 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770 dqget+0x67d/0x1080 fs/quota/dquot.c:914 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 ext4_process_orphan+0x47/0x410 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0x9630/0xad90 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1294 vfs_get_tree+0x8d/0x350 fs/super.c:1501 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4d/0x120 fs/quota/quota_v2.c:332 dquot_acquire+0x1b3/0x6c0 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770 dqget+0x67d/0x1080 fs/quota/dquot.c:914 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 ext4_create+0x94/0x4e0 fs/ext4/namei.c:2801 lookup_open.isra.0+0x105a/0x1400 fs/namei.c:3416 open_last_lookups fs/namei.c:3484 [inline] path_openat+0x975/0x2750 fs/namei.c:3712 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_creat fs/open.c:1440 [inline] __se_sys_creat fs/open.c:1434 [inline] __ia32_sys_creat+0xcc/0x120 fs/open.c:1434 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 dquot_commit+0x51/0x570 fs/quota/dquot.c:479 ext4_write_dquot+0x25f/0x330 fs/ext4/super.c:6754 ext4_mark_dquot_dirty fs/ext4/super.c:6802 [inline] ext4_mark_dquot_dirty+0x115/0x1b0 fs/ext4/super.c:6796 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_alloc_space+0x5f9/0xb80 fs/quota/dquot.c:1722 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline] dquot_alloc_space include/linux/quotaops.h:313 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0x5d5/0x4b20 fs/ext4/mballoc.c:5571 ext4_new_meta_blocks+0x302/0x360 fs/ext4/balloc.c:700 ext4_ext_grow_indepth fs/ext4/extents.c:1329 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1435 [inline] ext4_ext_insert_extent+0x1034/0x4130 fs/ext4/extents.c:2102 ext4_split_extent_at+0x497/0xe20 fs/ext4/extents.c:3253 ext4_force_split_extent_at fs/ext4/extents.c:338 [inline] ext4_swap_extents+0xbf9/0x1470 fs/ext4/extents.c:5689 move_extent_per_page fs/ext4/move_extent.c:372 [inline] ext4_move_extents+0x1fbf/0x4690 fs/ext4/move_extent.c:682 __ext4_ioctl+0x3dba/0x4b00 fs/ext4/ioctl.c:1352 ext4_ioctl fs/ext4/ioctl.c:1608 [inline] ext4_compat_ioctl+0xca/0x430 fs/ext4/ioctl.c:1684 __do_compat_sys_ioctl+0x255/0x2b0 fs/ioctl.c:968 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #0 (&ei->i_data_sem/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 down_write_nested+0x96/0x200 kernel/locking/rwsem.c:1689 ext4_double_down_write_data_sem fs/ext4/move_extent.c:55 [inline] ext4_double_down_write_data_sem fs/ext4/move_extent.c:51 [inline] ext4_move_extents+0x3b1/0x4690 fs/ext4/move_extent.c:620 __ext4_ioctl+0x3dba/0x4b00 fs/ext4/ioctl.c:1352 ext4_ioctl fs/ext4/ioctl.c:1608 [inline] ext4_compat_ioctl+0xca/0x430 fs/ext4/ioctl.c:1684 __do_compat_sys_ioctl+0x255/0x2b0 fs/ioctl.c:968 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 other info that might help us debug this: Chain exists of: &ei->i_data_sem/1 --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/2); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); lock(&ei->i_data_sem/1); *** DEADLOCK *** 4 locks held by syz-executor.0/25916: #0: ffff88801aedc460 (sb_writers#4){.+.+}-{0:0}, at: __ext4_ioctl+0x33f4/0x4b00 fs/ext4/ioctl.c:1348 #1: ffff88801c3ed440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88801c3ed440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: lock_two_nondirectories+0xf0/0x110 fs/inode.c:1122 #2: ffff88802909f258 (&sb->s_type->i_mutex_key#8/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #2: ffff88802909f258 (&sb->s_type->i_mutex_key#8/4){+.+.}-{3:3}, at: lock_two_nondirectories+0xd5/0x110 fs/inode.c:1124 #3: ffff88801c3ed2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem fs/ext4/move_extent.c:54 [inline] #3: ffff88801c3ed2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem fs/ext4/move_extent.c:51 [inline] #3: ffff88801c3ed2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_move_extents+0x3a4/0x4690 fs/ext4/move_extent.c:620 stack backtrace: CPU: 0 PID: 25916 Comm: syz-executor.0 Not tainted 6.3.0-rc2-syzkaller-00405-ga3671bd86a97 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 down_write_nested+0x96/0x200 kernel/locking/rwsem.c:1689 ext4_double_down_write_data_sem fs/ext4/move_extent.c:55 [inline] ext4_double_down_write_data_sem fs/ext4/move_extent.c:51 [inline] ext4_move_extents+0x3b1/0x4690 fs/ext4/move_extent.c:620 __ext4_ioctl+0x3dba/0x4b00 fs/ext4/ioctl.c:1352 ext4_ioctl fs/ext4/ioctl.c:1608 [inline] ext4_compat_ioctl+0xca/0x430 fs/ext4/ioctl.c:1684 __do_compat_sys_ioctl+0x255/0x2b0 fs/ioctl.c:968 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f72579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f6d5cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000c028660f RDX: 0000000020000080 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi