====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc3-syzkaller-00338-gda8e7da11e4b #0 Not tainted ------------------------------------------------------ syz-executor.0/27589 is trying to acquire lock: ffff888074b8e6d8 (&ei->i_data_sem/1){+.+.}-{3:3}, at: swap_inode_boot_loader fs/ext4/ioctl.c:423 [inline] ffff888074b8e6d8 (&ei->i_data_sem/1){+.+.}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] ffff888074b8e6d8 (&ei->i_data_sem/1){+.+.}-{3:3}, at: ext4_ioctl+0x450d/0x5b30 fs/ext4/ioctl.c:1608 but task is already holding lock: ffff888074b8a0a0 (&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_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_create+0xb5/0x550 fs/ext4/namei.c:2801 lookup_open fs/namei.c:3416 [inline] open_last_lookups fs/namei.c:3484 [inline] path_openat+0x13df/0x3170 fs/namei.c:3712 do_filp_open+0x234/0x490 fs/namei.c:3742 do_sys_openat2+0x13f/0x500 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_open fs/open.c:1372 [inline] __se_sys_open fs/open.c:1368 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1368 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_create+0xb5/0x550 fs/ext4/namei.c:2801 lookup_open fs/namei.c:3416 [inline] open_last_lookups fs/namei.c:3484 [inline] path_openat+0x13df/0x3170 fs/namei.c:3712 do_filp_open+0x234/0x490 fs/namei.c:3742 do_sys_openat2+0x13f/0x500 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_open fs/open.c:1372 [inline] __se_sys_open fs/open.c:1368 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1368 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_free_space+0x9a4/0xfc0 fs/quota/dquot.c:1907 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline] dquot_free_space include/linux/quotaops.h:384 [inline] swap_inode_boot_loader fs/ext4/ioctl.c:489 [inline] __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] ext4_ioctl+0x4dbb/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 swap_inode_boot_loader fs/ext4/ioctl.c:423 [inline] __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] ext4_ioctl+0x450d/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 *** 5 locks held by syz-executor.0/27589: #0: ffff88807bdec460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write_file+0x5e/0x1f0 fs/namespace.c:438 #1: ffff888074b8a218 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888074b8a218 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: lock_two_nondirectories+0xe2/0x140 fs/inode.c:1122 #2: ffff888074b8e850 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: swap_inode_boot_loader fs/ext4/ioctl.c:382 [inline] #2: ffff888074b8e850 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] #2: ffff888074b8e850 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: ext4_ioctl+0x24aa/0x5b30 fs/ext4/ioctl.c:1608 #3: ffff888074b8a3b8 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:803 [inline] #3: ffff888074b8a3b8 (mapping.invalidate_lock){++++}-{3:3}, at: swap_inode_boot_loader fs/ext4/ioctl.c:399 [inline] #3: ffff888074b8a3b8 (mapping.invalidate_lock){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] #3: ffff888074b8a3b8 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_ioctl+0x3fdf/0x5b30 fs/ext4/ioctl.c:1608 #4: ffff888074b8a0a0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x2c/0x50 stack backtrace: CPU: 1 PID: 27589 Comm: syz-executor.0 Not tainted 6.3.0-rc3-syzkaller-00338-gda8e7da11e4b #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+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 swap_inode_boot_loader fs/ext4/ioctl.c:423 [inline] __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] ext4_ioctl+0x450d/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: 0033:0x7f4ac228c0f9 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:00007f4ac3072168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4ac23abf80 RCX: 00007f4ac228c0f9 RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000008 RBP: 00007f4ac22e7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcc805d1ef R14: 00007f4ac3072300 R15: 0000000000022000