BTRFS info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/12007 is trying to acquire lock: 000000001a40212a (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_create_qgroup+0x5a/0x270 fs/btrfs/qgroup.c:1380 but task is already holding lock: 000000002e61a06a (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000002e61a06a (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 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.0/12007: #0: 000000006c4f8c9b (sb_writers#21){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000006c4f8c9b (sb_writers#21){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000002e61a06a (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 000000002e61a06a (sb_internal#2){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 12007 Comm: syz-executor.0 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: 0033:0x7ffaec3570a9 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:00007ffaea8c9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffaec476f80 RCX: 00007ffaec3570a9 RDX: 00000000200011c0 RSI: 000000004010942a RDI: 0000000000000004 RBP: 00007ffaec3b2ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff30d4d11f R14: 00007ffaea8c9300 R15: 0000000000022000 BTRFS error (device loop0): fail to start transaction for status update: -28 sctp: [Deprecated]: syz-executor.4 (pid 12087) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead BTRFS info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents BTRFS error (device loop0): fail to start transaction for status update: -28 audit: type=1804 audit(1672348706.612:31): pid=12162 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir2433632451/syzkaller.I7dZA1/126/file0" dev="sda1" ino=14264 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready A link change request failed with some changes committed already. Interface vxcan1 may have been left with an inconsistent configuration, please check. audit: type=1804 audit(1672348706.742:32): pid=12180 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir2433632451/syzkaller.I7dZA1/127/file0" dev="sda1" ino=14242 res=1 BTRFS info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents BTRFS error (device loop0): fail to start transaction for status update: -28 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready A link change request failed with some changes committed already. Interface vxcan1 may have been left with an inconsistent configuration, please check. audit: type=1804 audit(1672348707.092:33): pid=12231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir2433632451/syzkaller.I7dZA1/128/file0" dev="sda1" ino=14293 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready A link change request failed with some changes committed already. Interface vxcan1 may have been left with an inconsistent configuration, please check. BTRFS info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (12255) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (12265) BTRFS error (device loop0): fail to start transaction for status update: -28 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready A link change request failed with some changes committed already. Interface vxcan1 may have been left with an inconsistent configuration, please check. BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): force clearing of disk cache BTRFS info (device loop4): disabling free space tree BTRFS info (device loop4): has skinny extents BTRFS info (device loop4): clearing free space tree BTRFS info (device loop4): clearing 1 ro feature flag BTRFS info (device loop4): clearing 2 ro feature flag nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): force clearing of disk cache BTRFS info (device loop4): disabling free space tree BTRFS info (device loop4): has skinny extents BTRFS info (device loop4): clearing free space tree BTRFS info (device loop4): clearing 1 ro feature flag BTRFS info (device loop4): clearing 2 ro feature flag syz-executor.2 uses old SIOCAX25GETINFO x_tables: duplicate underflow at hook 1 BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): force clearing of disk cache BTRFS info (device loop4): disabling free space tree BTRFS info (device loop4): has skinny extents BTRFS info (device loop4): clearing free space tree BTRFS info (device loop4): clearing 1 ro feature flag BTRFS info (device loop4): clearing 2 ro feature flag nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. REISERFS (device loop2): found reiserfs format "3.6" with non-standard journal REISERFS (device loop2): using ordered data mode reiserfs: using flush barriers REISERFS (device loop2): journal params: device loop2, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 caif:caif_disconnect_client(): nothing to disconnect REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage. REISERFS (device loop2): found reiserfs format "3.6" with non-standard journal REISERFS (device loop2): using ordered data mode reiserfs: using flush barriers REISERFS (device loop2): journal params: device loop2, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage. x_tables: duplicate underflow at hook 1 REISERFS (device loop2): found reiserfs format "3.6" with non-standard journal REISERFS (device loop2): using ordered data mode reiserfs: using flush barriers REISERFS (device loop2): journal params: device loop2, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage. audit: type=1800 audit(1672348711.352:34): pid=12617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="loop0" ino=7 res=0 audit: type=1804 audit(1672348711.412:35): pid=12649 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir661798504/syzkaller.A2xt1W/93/file0/bus" dev="loop0" ino=7 res=1 REISERFS (device loop2): found reiserfs format "3.6" with non-standard journal REISERFS (device loop2): using ordered data mode reiserfs: using flush barriers REISERFS (device loop2): journal params: device loop2, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 audit: type=1800 audit(1672348712.072:36): pid=12681 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="sda1" ino=14330 res=0 REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage. audit: type=1800 audit(1672348713.352:37): pid=12681 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="sda1" ino=14330 res=0 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. device batadv1 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device batadv1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. block nbd4: shutting down sockets XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop2): DAX unsupported by block device. Turning off DAX. XFS (loop0): Unmounting Filesystem XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. audit: type=1804 audit(1672348714.242:38): pid=12754 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir3024838115/syzkaller.ZqI9Sl/98/file0/bus" dev="loop2" ino=43 res=1 audit: type=1804 audit(1672348714.292:39): pid=12819 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir3024838115/syzkaller.ZqI9Sl/98/file0/bus" dev="loop2" ino=43 res=1 syz-executor.2 (12754) used greatest stack depth: 23144 bytes left netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. XFS (loop2): Unmounting Filesystem block nbd4: Device being setup by another task XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Unmounting Filesystem XFS (loop2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop2): DAX unsupported by block device. Turning off DAX. XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. audit: type=1804 audit(1672348715.392:40): pid=12852 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir3024838115/syzkaller.ZqI9Sl/99/file0/bus" dev="loop2" ino=43 res=1 audit: type=1804 audit(1672348715.442:41): pid=12885 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir3024838115/syzkaller.ZqI9Sl/99/file0/bus" dev="loop2" ino=43 res=1