BTRFS info (device loop3): has skinny extents audit: type=1326 audit(1673905579.977:94): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=17676 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f7f40f090c9 code=0x0 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted 9pnet_virtio: no channels available for device 127.0.0.1 ------------------------------------------------------ syz-executor.3/17611 is trying to acquire lock: 00000000590c541b (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 9pnet_virtio: no channels available for device 127.0.0.1 0000000091894a4d (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 0000000091894a4d (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+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#4); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#4); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 4 locks held by syz-executor.3/17611: #0: 000000005a137bb0 (sb_writers#25){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000005a137bb0 (sb_writers#25){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000007d02a1a0 (&type->i_mutex_dir_key#15/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 00000000bd7e1429 (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 0000000091894a4d (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 0000000091894a4d (sb_internal#4){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 17611 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 overlayfs: unrecognized mount option "uppurdir=./bu\,workile1" or missing value 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 9pnet_virtio: no channels available for device 127.0.0.1 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 9pnet_virtio: no channels available for device 127.0.0.1 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 9pnet_virtio: no channels available for device 127.0.0.1 9pnet_virtio: no channels available for device 127.0.0.1 btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 9pnet_virtio: no channels available for device 127.0.0.1 create_subvol+0x3aa/0x1850 fs/btrfs/ioctl.c:617 9pnet_virtio: no channels available for device 127.0.0.1 btrfs_mksubvol+0xe1d/0x1160 fs/btrfs/ioctl.c:1007 9pnet_virtio: no channels available for device 127.0.0.1 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 netlink: 32 bytes leftover after parsing attributes in process `syz-executor.0'. RIP: 0033:0x7f806ac020c9 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:00007f8069174168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f806ad21f80 RCX: 00007f806ac020c9 RDX: 00000000200000c0 RSI: 000000005000940e RDI: 0000000000000005 RBP: 00007f806ac5dae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 netlink: 32 bytes leftover after parsing attributes in process `syz-executor.0'. R13: 00007ffe308a446f R14: 00007f8069174300 R15: 0000000000022000 XFS (loop4): Mounting V4 Filesystem XFS (loop4): Ending clean mount XFS (loop4): Unmounting Filesystem audit: type=1326 audit(1673905581.237:95): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=17742 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f7f40f090c9 code=0x0 9pnet_virtio: no channels available for device 127.0.0.1 netlink: 32 bytes leftover after parsing attributes in process `syz-executor.0'. BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents overlayfs: unrecognized mount option "uppurdir=./bu\,workile1" or missing value overlayfs: unrecognized mount option "uppurdir=./bu\,workile1" or missing value audit: type=1326 audit(1673905582.117:96): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=17855 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f7f40f090c9 code=0x0 BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents audit: type=1804 audit(1673905582.277:97): pid=17888 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3841987899/syzkaller.oSDUuD/61/bus" dev="sda1" ino=14747 res=1 audit: type=1804 audit(1673905582.457:98): pid=17912 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3841987899/syzkaller.oSDUuD/62/bus" dev="sda1" ino=14739 res=1 audit: type=1804 audit(1673905582.617:99): pid=17940 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3841987899/syzkaller.oSDUuD/63/bus" dev="sda1" ino=14739 res=1 audit: type=1804 audit(1673905582.747:100): pid=17940 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir3841987899/syzkaller.oSDUuD/63/bus" dev="sda1" ino=14739 res=1 EXT4-fs warning (device loop4): ext4_multi_mount_protect:312: fsck is running on the filesystem EXT4-fs warning (device loop4): ext4_multi_mount_protect:312: MMP failure info: last update time: 1669132790, last update node: dvyukov-desk.muc.corp.google.com, last update device: loop17 EXT4-fs warning (device loop4): ext4_multi_mount_protect:312: fsck is running on the filesystem EXT4-fs warning (device loop4): ext4_multi_mount_protect:312: MMP failure info: last update time: 1669132790, last update node: dvyukov-desk.muc.corp.google.com, last update device: loop17 JFS: c is an invalid error handler EXT4-fs warning (device loop4): ext4_multi_mount_protect:312: fsck is running on the filesystem EXT4-fs warning (device loop4): ext4_multi_mount_protect:312: MMP failure info: last update time: 1669132790, last update node: dvyukov-desk.muc.corp.google.com, last update device: loop17 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected JFS: c is an invalid error handler JFS: c is an invalid error handler hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected