audit: type=1800 audit(1673175628.247:859): pid=14938 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=13873 res=0 IPVS: ftp: loaded support on port[0] = 21 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/14834 is trying to acquire lock: 000000009e413621 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 but task is already holding lock: 00000000d84fd42d (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 00000000d84fd42d (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(1673175628.307:860): pid=14950 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3757672818/syzkaller.VNMWtb/3043/bus" dev="sda1" ino=13873 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_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 btrfs_ioctl_qgroup_limit fs/btrfs/ioctl.c:5386 [inline] btrfs_ioctl+0x3c0c/0x76d0 fs/btrfs/ioctl.c:6027 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 *** 2 locks held by syz-executor.2/14834: #0: 000000007190d1f1 (sb_writers#27){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000007190d1f1 (sb_writers#27){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 BTRFS error (device loop2): fail to start transaction for status update: -28 #1: 00000000d84fd42d (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 00000000d84fd42d (sb_internal#4){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 14834 Comm: syz-executor.2 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_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 btrfs_ioctl_qgroup_limit fs/btrfs/ioctl.c:5386 [inline] btrfs_ioctl+0x3c0c/0x76d0 fs/btrfs/ioctl.c:6027 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: 0033:0x7ff1435870c9 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:00007ff141af9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff1436a6f80 RCX: 00007ff1435870c9 RDX: 00000000200011c0 RSI: 000000008030942b RDI: 0000000000000004 RBP: 00007ff1435e2ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffa45e750f R14: 00007ff141af9300 R15: 0000000000022000 audit: type=1800 audit(1673175629.007:861): pid=14859 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=14321 res=0 BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (14868) BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (14956) audit: type=1804 audit(1673175629.687:862): pid=15019 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3757672818/syzkaller.VNMWtb/3044/bus" dev="sda1" ino=13898 res=1 IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1673175629.687:863): pid=15019 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=13898 res=0 audit: type=1804 audit(1673175629.687:864): pid=15019 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3757672818/syzkaller.VNMWtb/3044/bus" dev="sda1" ino=13898 res=1 BTRFS info (device loop5): unrecognized mount option '00000000000000000000003' BTRFS error (device loop5): open_ctree failed 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'. audit: type=1804 audit(1673175630.347:865): pid=15153 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3757672818/syzkaller.VNMWtb/3045/bus" dev="sda1" ino=14648 res=1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents SQUASHFS error: lzo decompression failed, data probably corrupt netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. SQUASHFS error: squashfs_read_data failed to read block 0x8f SQUASHFS error: Unable to read metadata cache entry [8f] SQUASHFS error: Unable to read inode 0x11f SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x8f SQUASHFS error: Unable to read metadata cache entry [8f] SQUASHFS error: Unable to read inode 0x11f SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x8f SQUASHFS error: Unable to read metadata cache entry [8f] SQUASHFS error: Unable to read inode 0x11f EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue overlayfs: maximum fs stacking depth exceeded