audit: type=1804 audit(1676312333.997:107): pid=25654 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/283/bus" dev="sda1" ino=14427 res=1 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/25653 is trying to acquire lock: 00000000b2464d27 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 00000000c70bc437 (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 00000000c70bc437 (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_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#3); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 4 locks held by syz-executor.4/25653: #0: 0000000035dc30d8 (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000035dc30d8 (sb_writers#18){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 00000000347d076b (&type->i_mutex_dir_key#9/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 00000000f34672a6 (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 00000000c70bc437 (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 00000000c70bc437 (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 25653 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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: 0033:0x7f5a5d1d40f9 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:00007f5a5b746168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5a5d2f3f80 RCX: 00007f5a5d1d40f9 RDX: 0000000020001a80 RSI: 0000000050009418 RDI: 0000000000000006 RBP: 00007f5a5d22fae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffc7c29e6f R14: 00007f5a5b746300 R15: 0000000000022000 BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (25668) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (25702) BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents audit: type=1804 audit(1676312335.207:108): pid=25764 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/284/bus" dev="sda1" ino=14518 res=1 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected audit: type=1804 audit(1676312335.247:109): pid=25822 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/284/bus" dev="sda1" ino=14518 res=1 BTRFS info (device loop4): enabling inode map caching IPVS: ftp: loaded support on port[0] = 21 BTRFS info (device loop4): using default commit interval 30s BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (25813) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (25814) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (25877) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (25885) audit: type=1804 audit(1676312335.917:110): pid=25840 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/285/bus" dev="sda1" ino=14348 res=1 audit: type=1804 audit(1676312335.977:111): pid=25840 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/285/bus" dev="sda1" ino=14348 res=1 audit: type=1804 audit(1676312335.987:112): pid=25840 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/285/bus" dev="sda1" ino=14348 res=1 BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents audit: type=1804 audit(1676312336.247:113): pid=25932 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/286/bus" dev="sda1" ino=14845 res=1 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected audit: type=1804 audit(1676312336.247:114): pid=25932 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/286/bus" dev="sda1" ino=14845 res=1 audit: type=1804 audit(1676312336.247:115): pid=25932 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3468450002/syzkaller.cCSaBB/286/bus" dev="sda1" ino=14845 res=1 BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): using default commit interval 30s BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (25936) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): using default commit interval 30s BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (26039) BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop0): enabling inode map caching BTRFS info (device loop0): using default commit interval 30s 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 (26125) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (26188) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (26226) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (26274) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (26250) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): using default commit interval 30s BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (26381) BTRFS info (device loop4): using free space tree BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (26410) BTRFS info (device loop4): has skinny extents BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop0): enabling inode map caching BTRFS info (device loop0): using default commit interval 30s 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 (26585) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (26635) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (26605) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (26649) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (26672) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (26715) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (26689) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): using default commit interval 30s BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (26756) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (26762) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (26807) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (26809) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): using default commit interval 30s BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (26833) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (26853) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (26824) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (26854) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected BTRFS info (device loop0): enabling inode map caching BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (26897) BTRFS info (device loop0): using default commit interval 30s 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 systemd-udevd (26923) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (26912) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (26926)