====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc6-syzkaller-00188-g3e7bb4f24617 #0 Not tainted ------------------------------------------------------ syz-executor.2/11295 is trying to acquire lock: ffff8880803066d8 (&ei->i_data_sem/1){+.+.}-{3:3}, at: ext4_move_extents+0x37d/0xe40 fs/ext4/move_extent.c:620 but task is already holding lock: ffff8880803048c0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x2c/0x50 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->i_data_sem/2){++++}-{3:3}: lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x38e/0x1cf0 fs/ext4/inode.c:574 ext4_getblk+0x1ef/0x7c0 fs/ext4/inode.c:863 ext4_bread+0x2e/0x180 fs/ext4/inode.c:919 ext4_quota_read+0x1a5/0x2c0 fs/ext4/super.c:7089 read_blk fs/quota/quota_tree.c:55 [inline] find_tree_dqentry+0x18c/0xbd0 fs/quota/quota_tree.c:624 find_tree_dqentry+0x486/0xbd0 fs/quota/quota_tree.c:640 find_tree_dqentry+0x486/0xbd0 fs/quota/quota_tree.c:640 find_tree_dqentry+0x486/0xbd0 fs/quota/quota_tree.c:640 find_dqentry fs/quota/quota_tree.c:652 [inline] qtree_read_dquot+0x143/0x650 fs/quota/quota_tree.c:672 v2_read_dquot+0xc2/0x110 fs/quota/quota_v2.c:333 dquot_acquire+0x18c/0x680 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6770 dqget+0x98f/0xdb0 fs/quota/dquot.c:914 __dquot_initialize+0x2dd/0xe20 fs/quota/dquot.c:1492 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xb21/0x13c0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0x8239/0x8990 fs/ext4/super.c:5637 get_tree_bdev+0x402/0x620 fs/super.c:1303 vfs_get_tree+0x8c/0x270 fs/super.c:1510 do_new_mount+0x28f/0xae0 fs/namespace.c:3042 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4e/0x110 fs/quota/quota_v2.c:332 dquot_acquire+0x18c/0x680 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6770 dqget+0x98f/0xdb0 fs/quota/dquot.c:914 __dquot_initialize+0x2dd/0xe20 fs/quota/dquot.c:1492 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xb21/0x13c0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0x8239/0x8990 fs/ext4/super.c:5637 get_tree_bdev+0x402/0x620 fs/super.c:1303 vfs_get_tree+0x8c/0x270 fs/super.c:1510 do_new_mount+0x28f/0xae0 fs/namespace.c:3042 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&dquot->dq_lock){+.+.}-{3:3}: lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 dquot_commit+0x5b/0x520 fs/quota/dquot.c:479 ext4_write_dquot+0x1f2/0x2c0 fs/ext4/super.c:6754 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_alloc_space+0x54c/0xf50 fs/quota/dquot.c:1722 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline] dquot_alloc_space include/linux/quotaops.h:313 [inline] swap_inode_boot_loader fs/ext4/ioctl.c:491 [inline] __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] ext4_ioctl+0x523d/0x5b30 fs/ext4/ioctl.c:1608 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #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+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1689 ext4_move_extents+0x37d/0xe40 fs/ext4/move_extent.c:620 __ext4_ioctl fs/ext4/ioctl.c:1352 [inline] ext4_ioctl+0x3841/0x5b30 fs/ext4/ioctl.c:1608 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd 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.2/11295: #0: ffff88814ba1e460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write_file+0x5e/0x1f0 fs/namespace.c:438 #1: ffff888080304a38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888080304a38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: lock_two_nondirectories+0xe2/0x140 fs/inode.c:1122 #2: ffff888080306850 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: ext4_move_extents+0x362/0xe40 fs/ext4/move_extent.c:613 #3: ffff8880803048c0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x2c/0x50 stack backtrace: CPU: 1 PID: 11295 Comm: syz-executor.2 Not tainted 6.3.0-rc6-syzkaller-00188-g3e7bb4f24617 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2fe/0x3b0 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+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1689 ext4_move_extents+0x37d/0xe40 fs/ext4/move_extent.c:620 __ext4_ioctl fs/ext4/ioctl.c:1352 [inline] ext4_ioctl+0x3841/0x5b30 fs/ext4/ioctl.c:1608 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f72a128c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f72a201c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f72a13abf80 RCX: 00007f72a128c169 RDX: 0000000020000000 RSI: 00000000c028660f RDI: 0000000000000003 RBP: 00007f72a12e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd860acd4f R14: 00007f72a201c300 R15: 0000000000022000