XFS (nullb0): Invalid superblock magic number ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/17749 is trying to acquire lock: 00000000be25fa06 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 00000000b304d3cc (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 00000000b304d3cc (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 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_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 create_subvol+0x3aa/0x1850 fs/btrfs/ioctl.c:617 btrfs_mksubvol+0xe1d/0x1160 fs/btrfs/ioctl.c:1007 btrfs_ioctl_snap_create_transid+0x2a7/0x430 fs/btrfs/ioctl.c:1771 btrfs_ioctl_snap_create+0x114/0x170 fs/btrfs/ioctl.c:1819 btrfs_ioctl+0x274b/0x76d0 fs/btrfs/ioctl.c:5932 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 4 locks held by syz-executor.1/17749: #0: 0000000091b6912a (sb_writers#17){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000091b6912a (sb_writers#17){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000000fcaab32 (&type->i_mutex_dir_key#9/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 000000005731451c (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 00000000b304d3cc (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 00000000b304d3cc (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 17749 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 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_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 create_subvol+0x3aa/0x1850 fs/btrfs/ioctl.c:617 btrfs_mksubvol+0xe1d/0x1160 fs/btrfs/ioctl.c:1007 btrfs_ioctl_snap_create_transid+0x2a7/0x430 fs/btrfs/ioctl.c:1771 btrfs_ioctl_snap_create+0x114/0x170 fs/btrfs/ioctl.c:1819 btrfs_ioctl+0x274b/0x76d0 fs/btrfs/ioctl.c:5932 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: 0033:0x7f6b1d1ba0f9 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:00007f6b1b72c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6b1d2d9f80 RCX: 00007f6b1d1ba0f9 RDX: 0000000020000240 RSI: 000000005000940e RDI: 0000000000000004 RBP: 00007f6b1d215ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe24c0f11f R14: 00007f6b1b72c300 R15: 0000000000022000 XFS (nullb0): Invalid superblock magic number BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (17780) XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS info (device loop1): enabling inode map caching BTRFS warning (device loop1): excessive commit interval 620990646 BTRFS info (device loop1): force zlib compression, level 3 BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents XFS (nullb0): Invalid superblock magic number BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (17883) XFS (nullb0): Invalid superblock magic number BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (17932) XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (loop3): Mounting V4 Filesystem XFS (loop3): totally zeroed log XFS (loop3): Ending clean mount XFS (loop3): Unmounting Filesystem XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (17998) BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 620990646 BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (18017) 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 error (device loop5): fail to start transaction for status update: -28 XFS (loop4): Mounting V4 Filesystem XFS (loop4): totally zeroed log XFS (loop4): Ending clean mount XFS (loop4): Unmounting Filesystem XFS (loop3): Mounting V4 Filesystem XFS (loop3): totally zeroed log XFS (loop3): Ending clean mount XFS (loop3): Unmounting Filesystem XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS info (device loop1): enabling inode map caching BTRFS warning (device loop1): excessive commit interval 620990646 XFS (nullb0): Invalid superblock magic number BTRFS info (device loop1): force zlib compression, level 3 BTRFS info (device loop1): using free space tree BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (18094) BTRFS info (device loop1): has skinny extents BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (18165) XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 620990646 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents XFS (loop3): Mounting V4 Filesystem XFS (loop3): totally zeroed log XFS (loop3): Ending clean mount XFS (loop3): Unmounting Filesystem BTRFS error (device loop5): fail to start transaction for status update: -28 XFS (nullb0): Invalid superblock magic number XFS (loop4): Mounting V4 Filesystem XFS (loop4): totally zeroed log XFS (loop4): Ending clean mount XFS (loop4): Unmounting Filesystem XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS info (device loop5): enabling inode map caching XFS (nullb0): Invalid superblock magic number BTRFS warning (device loop5): excessive commit interval 620990646 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents XFS (nullb0): Invalid superblock magic number BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (18294) XFS (nullb0): Invalid superblock magic number BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (18369) BTRFS error (device loop5): fail to start transaction for status update: -28 XFS (nullb0): Invalid superblock magic number BTRFS info (device loop1): enabling inode map caching BTRFS warning (device loop1): excessive commit interval 620990646 BTRFS info (device loop1): force zlib compression, level 3 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 (18394) XFS (loop3): Mounting V4 Filesystem XFS (loop3): totally zeroed log XFS (loop3): Ending clean mount XFS (loop3): Unmounting Filesystem BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (18410) XFS (loop4): Mounting V4 Filesystem XFS (loop4): totally zeroed log XFS (loop4): Ending clean mount XFS (loop4): Unmounting Filesystem XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS info (device loop5): enabling inode map caching BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (18483) BTRFS warning (device loop5): excessive commit interval 620990646 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/loop1 devid 1 generation 8 scanned by systemd-udevd (18520) XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS error (device loop5): fail to start transaction for status update: -28 BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (18544) XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (loop3): Mounting V4 Filesystem XFS (loop3): totally zeroed log XFS (loop3): Ending clean mount XFS (loop3): Unmounting Filesystem BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 620990646 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents XFS (loop4): Mounting V4 Filesystem XFS (loop4): totally zeroed log XFS (loop4): Ending clean mount XFS (loop4): Unmounting Filesystem XFS (nullb0): Mounting V4 Filesystem XFS (nullb0): totally zeroed log XFS (nullb0): Metadata corruption detected at xfs_agi_verify+0x113/0x590 fs/xfs/libxfs/xfs_ialloc.c:2517, xfs_agi block 0x2 XFS (nullb0): Unmount and run xfs_repair XFS (nullb0): First 128 bytes of corrupted metadata buffer: BTRFS error (device loop5): fail to start transaction for status update: -28 00000000d1f45bd2: c0 75 8f 9b 80 88 ff ff 70 82 ce ff ff e8 ff ff .u......p....... 000000005ac758f5: 50 20 73 9a 80 88 ff ff 00 02 00 00 00 00 ad de P s............. 00000000d2cbc7cc: 00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de .............N.. 0000000018887f3b: ff ff ff ff 00 00 00 00 ff ff ff ff ff ff ff ff ................ 000000006c487069: e0 f1 66 8c ff ff ff ff 00 00 00 00 00 00 00 00 ..f............. 00000000e19da7b7: 00 00 00 00 00 00 00 00 c0 08 6a 88 ff ff ff ff ..........j..... 00000000e554321d: 00 00 00 00 00 00 00 00 e8 8a b9 95 80 88 ff ff ................ 000000005ceaa711: e8 8a b9 95 80 88 ff ff a0 8a b9 95 80 88 ff ff ................ XFS (nullb0): metadata I/O error in "xfs_trans_read_buf_map" at daddr 0x2 len 1 error 117 XFS (nullb0): xfs_imap_lookup: xfs_ialloc_read_agi() returned error -117, agno 0 XFS (nullb0): Failed to read root inode 0x20, error 117 XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS info (device loop1): enabling inode map caching XFS (nullb0): Invalid superblock magic number BTRFS warning (device loop1): excessive commit interval 620990646 BTRFS info (device loop1): force zlib compression, level 3 BTRFS info (device loop1): using free space tree XFS (nullb0): Invalid superblock magic number BTRFS info (device loop1): has skinny extents BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (18704) XFS (nullb0): Invalid superblock magic number BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (18750) XFS (nullb0): Invalid superblock magic number BTRFS info (device loop5): enabling inode map caching XFS (loop3): Mounting V4 Filesystem BTRFS warning (device loop5): excessive commit interval 620990646 XFS (loop3): totally zeroed log XFS (loop3): Ending clean mount BTRFS info (device loop5): force zlib compression, level 3 XFS (loop3): Unmounting Filesystem BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS error (device loop5): fail to start transaction for status update: -28 XFS (loop4): Mounting V4 Filesystem XFS (loop4): totally zeroed log XFS (loop4): Ending clean mount XFS (loop4): Unmounting Filesystem XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number XFS (nullb0): Invalid superblock magic number BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 620990646 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents