BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (22516) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (22535) ubi: mtd0 is already attached to ubi0 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/22499 is trying to acquire lock: 00000000f15535d8 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_create_qgroup+0x5a/0x270 fs/btrfs/qgroup.c:1380 but task is already holding lock: 00000000549328f1 (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 00000000549328f1 (sb_internal#2){.+.+}, 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#2){.+.+}: 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 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_create_qgroup+0x5a/0x270 fs/btrfs/qgroup.c:1380 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5335 [inline] btrfs_ioctl+0xcce/0x76d0 fs/btrfs/ioctl.c:6025 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 BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (22546) 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#2); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#2); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 2 locks held by syz-executor.2/22499: #0: 00000000aa74d383 (sb_writers#17){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000aa74d383 (sb_writers#17){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 00000000549328f1 (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 00000000549328f1 (sb_internal#2){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 22499 Comm: syz-executor.2 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_create_qgroup+0x5a/0x270 fs/btrfs/qgroup.c:1380 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5335 [inline] btrfs_ioctl+0xcce/0x76d0 fs/btrfs/ioctl.c:6025 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: 0033:0x7f287ab0a0d9 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:00007f287907c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f287ac29f80 RCX: 00007f287ab0a0d9 RDX: 0000000020000100 RSI: 000000004010942a RDI: 0000000000000004 RBP: 00007f287ab65ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcca3fad8f R14: 00007f287907c300 R15: 0000000000022000 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (22554) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 10 scanned by systemd-udevd (22538) BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 622039222 ubi: mtd0 is already attached to ubi0 BTRFS info (device loop5): force zlib compression, level 3 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (22535) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (22599) BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (22613) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (22657) BTRFS error (device loop5): fail to start transaction for status update: -28 BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (22614) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (22625) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (22669) BTRFS info (device loop1): enabling inode map caching BTRFS warning (device loop1): excessive commit interval 622039222 BTRFS info (device loop1): force zlib compression, level 3 ubi: mtd0 is already attached to ubi0 BTRFS info (device loop1): using free space tree BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (22667) BTRFS info (device loop1): has skinny extents BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (22693) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (22783) BTRFS info (device loop4): enabling inode map caching BTRFS warning (device loop4): excessive commit interval 622039222 BTRFS info (device loop4): force zlib compression, level 3 BTRFS info (device loop4): using free space tree BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (22770) BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (22825) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (22799) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (22831) ubi: mtd0 is already attached to ubi0 BTRFS error (device loop4): fail to start transaction for status update: -28 ubi: mtd0 is already attached to ubi0 BTRFS info (device loop4): enabling inode map caching BTRFS warning (device loop4): excessive commit interval 622039222 BTRFS info (device loop4): force zlib compression, level 3 BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (22871) BTRFS info (device loop4): using free space tree BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (22905) BTRFS info (device loop4): has skinny extents ubi: mtd0 is already attached to ubi0 ubi: mtd0 is already attached to ubi0 ubi: mtd0 is already attached to ubi0 BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (22883) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (22903) BTRFS error (device loop4): fail to start transaction for status update: -28 BTRFS info (device loop2): unrecognized mount option 'user_subvowed' BTRFS error (device loop2): open_ctree failed BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (22965) BTRFS info (device loop1): unrecognized mount option 'noinode)A}g_cache' BTRFS error (device loop1): open_ctree failed BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 622039222 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (22950) ubi: mtd0 is already attached to ubi0 ubi: mtd0 is already attached to ubi0 BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (22992) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (22973) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (23040) BTRFS info (device loop1): unrecognized mount option 'noinode)A}g_cache' BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (22978) BTRFS error (device loop1): open_ctree failed BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (23026) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (23074) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (23058) BTRFS info (device loop1): unrecognized mount option 'noinode)A}g_cache' BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (23062) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (23117) BTRFS error (device loop1): open_ctree failed BTRFS info (device loop0): unrecognized mount option 'c' BTRFS error (device loop0): open_ctree failed BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (23128) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (23129) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (23159) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (23162) BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (23216) BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (23215) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (23264) ubi: mtd0 is already attached to ubi0 BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 9 scanned by systemd-udevd (23274) BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 622039222 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (23283) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (23325) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 9 scanned by systemd-udevd (23333) BTRFS info (device loop0): unrecognized mount option 'Hoinode_caghe' BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (23330) BTRFS error (device loop0): open_ctree failed BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents ubi: mtd0 is already attached to ubi0 ubi: mtd0 is already attached to ubi0 BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (23337) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (23360) ubi: mtd0 is already attached to ubi0 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (23339) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (23348) ubi: mtd0 is already attached to ubi0 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (23356) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (23401) BTRFS info (device loop0): unrecognized mount option 'Hoinode_caghe' BTRFS error (device loop0): open_ctree failed ubi: mtd0 is already attached to ubi0 BTRFS info (device loop4): enabling inode map caching BTRFS warning (device loop4): excessive commit interval 622039222 BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (23417) BTRFS info (device loop4): force zlib compression, level 3 BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (23436) BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (23429) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (23452) BTRFS error (device loop4): fail to start transaction for status update: -28 BTRFS info (device loop0): unrecognized mount option 'usEr]subvol_rm_allowed' BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (23463) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (23513) BTRFS error (device loop0): open_ctree failed BTRFS info (device loop1): enabling inode map caching BTRFS warning (device loop1): excessive commit interval 622039222 BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (23496) ubi: mtd0 is already attached to ubi0 ubi: mtd0 is already attached to ubi0 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (23508) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (23513) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 9 scanned by systemd-udevd (23516) BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 622039222 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (23584) BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): unrecognized mount option 'commit=0x000000002513-force' BTRFS error (device loop2): open_ctree failed BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (23594) BTRFS info (device loop4): enabling inode map caching BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (23638) ubi: mtd0 is already attached to ubi0 device lo entered promiscuous mode BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (23643) BTRFS warning (device loop4): excessive commit interval 622039222 Y4`Ҙ: renamed from lo BTRFS info (device loop4): force zlib compression, level 3 BTRFS info (device loop4): using free space tree ubi: mtd0 is already attached to ubi0 BTRFS info (device loop4): has skinny extents ubi: mtd0 is already attached to ubi0 BTRFS error (device loop4): fail to start transaction for status update: -28