XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/16607 is trying to acquire lock: 00000000a35bd773 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_del_qgroup_relation+0x45/0x70 fs/btrfs/qgroup.c:1366 but task is already holding lock: 00000000ad318ebb (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 00000000ad318ebb (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_internal#3){.+.+}: sb_start_intwrite include/linux/fs.h:1626 [inline] start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 btrfs_quota_enable+0x169/0x10b0 fs/btrfs/qgroup.c:905 btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:5233 [inline] btrfs_ioctl+0x622c/0x76d0 fs/btrfs/ioctl.c:6021 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (16643) vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&fs_info->qgroup_ioctl_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_del_qgroup_relation+0x45/0x70 fs/btrfs/qgroup.c:1366 btrfs_ioctl_qgroup_assign fs/btrfs/ioctl.c:5282 [inline] btrfs_ioctl+0x6004/0x76d0 fs/btrfs/ioctl.c:6023 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (16632) __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_internal#3); BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (16693) lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 2 locks held by syz-executor.1/16607: #0: 00000000bb8fd92d (sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000bb8fd92d (sb_writers#16){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (16696) #1: 00000000ad318ebb (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 00000000ad318ebb (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 16607 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_del_qgroup_relation+0x45/0x70 fs/btrfs/qgroup.c:1366 btrfs_ioctl_qgroup_assign fs/btrfs/ioctl.c:5282 [inline] btrfs_ioctl+0x6004/0x76d0 fs/btrfs/ioctl.c:6023 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff50065a0c9 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:00007ff4febcc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff500779f80 RCX: 00007ff50065a0c9 RDX: 0000000020000e80 RSI: 0000000040189429 RDI: 0000000000000004 RBP: 00007ff5006b5ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe06a3081f R14: 00007ff4febcc300 R15: 0000000000022000 XFS (loop0): Unmounting Filesystem XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (16694) XFS (loop2): Unmounting Filesystem BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents BTRFS error (device loop3): fail to start transaction for status update: -28 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (16722) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (16768) BTRFS info (device loop1): using free space tree BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (16734) BTRFS info (device loop1): has skinny extents BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (16783) XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. XFS (loop0): Unmounting Filesystem BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS error (device loop4): fail to start transaction for status update: -28 XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. BTRFS info (device loop5): using free space tree XFS (loop2): Quotacheck: Done. BTRFS info (device loop5): has skinny extents XFS (loop2): Unmounting Filesystem BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (16829) XFS (loop3): Mounting V4 Filesystem XFS (loop3): Ending clean mount XFS (loop3): Quotacheck needed: Please wait. XFS (loop3): Quotacheck: Done. BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents XFS (loop3): Unmounting Filesystem BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (16910) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (16960) XFS (loop0): Mounting V4 Filesystem BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (16941) BTRFS error (device loop4): fail to start transaction for status update: -28 BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (16954) XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. XFS (loop0): Unmounting Filesystem XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. BTRFS info (device loop4): using free space tree XFS (loop2): Unmounting Filesystem BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (17002) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (17031) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (17013) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (17029) BTRFS error (device loop4): fail to start transaction for status update: -28 XFS (loop3): Mounting V4 Filesystem XFS (loop3): Ending clean mount XFS (loop3): Quotacheck needed: Please wait. XFS (loop3): Quotacheck: Done. XFS (loop3): Unmounting Filesystem BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents XFS (loop0): Mounting V4 Filesystem BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (17069) XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (17118) XFS (loop0): Quotacheck: Done. XFS (loop0): Unmounting Filesystem BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (17088) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (17138) BTRFS info (device loop1): using free space tree XFS (loop2): Mounting V4 Filesystem BTRFS info (device loop1): has skinny extents XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. XFS (loop2): Unmounting Filesystem BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents XFS (loop3): Mounting V4 Filesystem XFS (loop3): Ending clean mount XFS (loop3): Quotacheck needed: Please wait. BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (17158) BTRFS error (device loop4): fail to start transaction for status update: -28 XFS (loop3): Quotacheck: Done. XFS (loop3): Unmounting Filesystem BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents XFS (loop0): Mounting V4 Filesystem BTRFS info (device loop4): using free space tree XFS (loop0): Ending clean mount BTRFS info (device loop4): has skinny extents XFS (loop0): Quotacheck needed: Please wait. BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (17252) XFS (loop0): Quotacheck: Done. BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (17316) XFS (loop0): Unmounting Filesystem XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. BTRFS error (device loop4): fail to start transaction for status update: -28 XFS (loop2): Unmounting Filesystem BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (17342) XFS (loop3): Mounting V4 Filesystem XFS (loop3): Ending clean mount BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (17391) XFS (loop3): Quotacheck needed: Please wait. XFS (loop3): Quotacheck: Done. BTRFS info (device loop1): Snapshot src from another FS XFS (loop3): Unmounting Filesystem BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents XFS (loop2): Mounting V4 Filesystem BTRFS error (device loop4): fail to start transaction for status update: -28 XFS (loop2): Ending clean mount XFS (loop0): Mounting V4 Filesystem XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. BTRFS info (device loop5): using free space tree XFS (loop0): Ending clean mount BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 13 scanned by systemd-udevd (17465) BTRFS info (device loop5): has skinny extents XFS (loop0): Quotacheck needed: Please wait. XFS (loop2): Unmounting Filesystem XFS (loop0): Quotacheck: Done. XFS (loop0): Unmounting Filesystem BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (17423) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (17465) BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (17504) XFS (loop3): Mounting V4 Filesystem BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (17550) BTRFS error (device loop4): fail to start transaction for status update: -28 XFS (loop3): Ending clean mount XFS (loop3): Quotacheck needed: Please wait. XFS (loop3): Quotacheck: Done. XFS (loop3): Unmounting Filesystem BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents XFS (loop2): Mounting V4 Filesystem