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 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/20344 is trying to acquire lock: 00000000cae3f9e3 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 000000008739c5d2 (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000008739c5d2 (sb_internal#4){.+.+}, 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#4){.+.+}: 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_v2+0x2db/0x5d0 fs/btrfs/ioctl.c:1885 btrfs_ioctl+0x26f6/0x76d0 fs/btrfs/ioctl.c:5934 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#4); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#4); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 4 locks held by syz-executor.2/20344: #0: 00000000a48f511f (sb_writers#25){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000a48f511f (sb_writers#25){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 00000000422b3f34 (&type->i_mutex_dir_key#14/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 0000000027fe40e3 (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 000000008739c5d2 (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 000000008739c5d2 (sb_internal#4){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 20344 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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_v2+0x2db/0x5d0 fs/btrfs/ioctl.c:1885 btrfs_ioctl+0x26f6/0x76d0 fs/btrfs/ioctl.c:5934 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: 0033:0x7ff8a31e50c9 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:00007ff8a1757168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff8a3304f80 RCX: 00007ff8a31e50c9 RDX: 0000000020001a80 RSI: 0000000050009418 RDI: 0000000000000005 RBP: 00007ff8a3240ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc8842b0ff R14: 00007ff8a1757300 R15: 0000000000022000 validate_nla: 9 callbacks suppressed netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 'syz-executor.1': attribute type 4 has an invalid length. 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 netlink: 'syz-executor.1': attribute type 4 has an invalid length. overlayfs: unrecognized mount option "lo" or missing value netlink: 'syz-executor.1': attribute type 4 has an invalid length. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. device veth3 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth3: link is not ready netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.1': attribute type 4 has an invalid length. overlayfs: unrecognized mount option "lo" or missing value IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "lo" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. device veth5 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth5: link is not ready device veth7 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth7: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready device veth9 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth9: link is not ready device veth11 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth11: link is not ready device veth13 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth13: link is not ready device veth15 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth15: link is not ready device veth17 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth17: link is not ready netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 'syz-executor.1': attribute type 4 has an invalid length. device veth19 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth19: link is not ready device veth21 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth21: link is not ready device veth23 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth23: link is not ready device veth25 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth25: link is not ready device veth27 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth27: link is not ready device veth29 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth29: link is not ready device veth31 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth31: link is not ready device veth33 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth33: link is not ready device veth35 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth35: link is not ready device veth37 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth37: link is not ready netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. device veth39 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth39: link is not ready device veth41 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth41: link is not ready netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. device veth43 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth43: link is not ready device veth45 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth45: link is not ready device veth47 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth47: link is not ready device veth49 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth49: link is not ready device veth51 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth51: link is not ready device veth53 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth53: link is not ready device veth55 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth55: link is not ready device veth57 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth57: link is not ready device veth59 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth59: link is not ready device veth61 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth61: link is not ready device veth63 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth63: link is not ready device veth65 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth65: link is not ready device veth67 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth67: link is not ready device veth69 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth69: link is not ready device veth71 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth71: link is not ready device veth73 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth73: link is not ready device veth75 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth75: link is not ready netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. IPVS: ftp: loaded support on port[0] = 21 netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 'syz-executor.1': attribute type 4 has an invalid length. IPVS: ftp: loaded support on port[0] = 21 Unknown ioctl 19584 Unknown ioctl 19584 IPVS: ftp: loaded support on port[0] = 21 validate_nla: 5 callbacks suppressed netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 'syz-executor.1': attribute type 4 has an invalid length. Unknown ioctl 19584 netlink: 'syz-executor.0': attribute type 4 has an invalid length. netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 'syz-executor.0': attribute type 4 has an invalid length. nla_parse: 9 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 'syz-executor.1': attribute type 4 has an invalid length. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 'syz-executor.1': attribute type 4 has an invalid length.