kauditd_printk_skb: 15 callbacks suppressed audit: type=1800 audit(1678105960.306:1812): pid=24802 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=15254 res=0 ====================================================== WARNING: possible circular locking dependency detected new mount options do not match the existing superblock, will be ignored 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/24715 is trying to acquire lock: 00000000781f25d6 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 000000000feda72b (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000000feda72b (sb_internal#4){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 which lock already depends on the new lock. audit: type=1804 audit(1678105960.326:1813): pid=24802 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/246/file0" dev="sda1" ino=15254 res=1 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.2/24715: #0: 0000000055524807 (sb_writers#22){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000055524807 (sb_writers#22){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000007c890ecb (&type->i_mutex_dir_key#12/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 000000007710d04e (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 000000000feda72b (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 000000000feda72b (sb_internal#4){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 24715 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 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 warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (24831) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (24819) 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: 0033:0x7f17e61060f9 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:00007f17e4678168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f17e6225f80 RCX: 00007f17e61060f9 RDX: 00000000200013c0 RSI: 0000000050009418 RDI: 0000000000000003 RBP: 00007f17e6161ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcbc4ac79f R14: 00007f17e4678300 R15: 0000000000022000 netlink: 'syz-executor.0': attribute type 4 has an invalid length. IPVS: ftp: loaded support on port[0] = 21 new mount options do not match the existing superblock, will be ignored audit: type=1800 audit(1678105961.946:1814): pid=24888 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=15285 res=0 audit: type=1804 audit(1678105961.976:1815): pid=24888 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/247/file0" dev="sda1" ino=15285 res=1 BTRFS info (device loop1): unrecognized mount option 'ref_verify' BTRFS error (device loop1): open_ctree failed new mount options do not match the existing superblock, will be ignored IPVS: ftp: loaded support on port[0] = 21 netlink: 'syz-executor.0': attribute type 4 has an invalid length. IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 nla_parse: 23 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1678105962.486:1816): pid=24932 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=15290 res=0 audit: type=1804 audit(1678105962.496:1817): pid=24932 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/248/file0" dev="sda1" ino=15290 res=1 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: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. IPVS: ftp: loaded support on port[0] = 21 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. 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 audit: type=1804 audit(1678105963.996:1818): pid=25113 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2504159940/syzkaller.YytflN/286/bus" dev="sda1" ino=15245 res=1 BTRFS info (device loop2): has skinny extents audit: type=1804 audit(1678105964.126:1819): pid=25122 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/249/bus" dev="sda1" ino=15304 res=1 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. IPVS: ftp: loaded support on port[0] = 21 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1678105964.997:1820): pid=25405 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2504159940/syzkaller.YytflN/287/bus" dev="sda1" ino=15295 res=1 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 new mount options do not match the existing superblock, will be ignored audit: type=1804 audit(1678105965.467:1821): pid=25522 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/250/bus" dev="sda1" ino=14179 res=1 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. audit: type=1804 audit(1678105965.807:1822): pid=25560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2504159940/syzkaller.YytflN/288/bus" dev="sda1" ino=14386 res=1 new mount options do not match the existing superblock, will be ignored XFS (loop3): Mounting V4 Filesystem XFS (loop3): Ending clean mount XFS (loop3): Quotacheck needed: Please wait. XFS (loop3): Quotacheck: Done. audit: type=1804 audit(1678105967.327:1823): pid=25539 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir2316865954/syzkaller.s9jluJ/32/bus/bus" dev="loop3" ino=42 res=1 XFS (loop3): Unmounting Filesystem nla_parse: 2 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1804 audit(1678105967.587:1824): pid=25617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/251/bus" dev="sda1" ino=14705 res=1 audit: type=1804 audit(1678105967.587:1825): pid=25617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/251/bus" dev="sda1" ino=14705 res=1 audit: type=1804 audit(1678105967.587:1826): pid=25617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/251/bus" dev="sda1" ino=14705 res=1 new mount options do not match the existing superblock, will be ignored audit: type=1804 audit(1678105967.587:1827): pid=25617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/251/bus" dev="sda1" ino=14705 res=1 audit: type=1804 audit(1678105967.587:1828): pid=25617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/251/bus" dev="sda1" ino=14705 res=1 audit: type=1804 audit(1678105967.587:1829): pid=25617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/251/bus" dev="sda1" ino=14705 res=1 audit: type=1804 audit(1678105967.587:1830): pid=25617 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3839227709/syzkaller.UJ4N0v/251/bus" dev="sda1" ino=14705 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.