====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/12904 is trying to acquire lock: 0000000055403a68 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 but task is already holding lock: netlink: 9 bytes leftover after parsing attributes in process `syz-executor.3'. 000000007f8cddd0 (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000007f8cddd0 (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_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5337 [inline] btrfs_ioctl+0x661c/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#4); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#4); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 2 locks held by syz-executor.2/12904: #0: 000000008ccf6040 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000008ccf6040 (sb_writers#20){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000007f8cddd0 (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 000000007f8cddd0 (sb_internal#4){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 12904 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_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5337 [inline] btrfs_ioctl+0x661c/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: 0033:0x7f79cb7680a9 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:00007f79c28b9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f79cb888050 RCX: 00007f79cb7680a9 RDX: 00000000200011c0 RSI: 000000004010942a RDI: 0000000000000005 RBP: 00007f79cb7c3ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe6502ac8f R14: 00007f79c28b9300 R15: 0000000000022000 BTRFS error (device loop2): fail to start transaction for status update: -28 device gretap0 entered promiscuous mode netlink: 5 bytes leftover after parsing attributes in process `syz-executor.3'. 0猉功D龌: renamed from gretap0 device c0猉功D龌 left promiscuous mode F2FS-fs (loop1): invalid crc value F2FS-fs (loop1): Found nat_bits in checkpoint netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. block nbd4: Device being setup by another task netlink: 5 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 9 bytes leftover after parsing attributes in process `syz-executor.3'. device c0猉功D龌 entered promiscuous mode BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS error (device loop2): fail to start transaction for status update: -28 netlink: 9 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor.3'. 1猉功D龌: renamed from c0猉功D龌 device c1猉功D龌 left promiscuous mode f2fs_msg: 2 callbacks suppressed F2FS-fs (loop0): invalid crc value F2FS-fs (loop0): Found nat_bits in checkpoint F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4 kauditd_printk_skb: 126 callbacks suppressed audit: type=1800 audit(1672682758.948:179): pid=12974 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="loop0" ino=10 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent F2FS-fs (loop0): sanity_check_inode: inode (ino=7) has corrupted i_extra_isize: 36, max: 24 overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent F2FS-fs (loop4): invalid crc value F2FS-fs (loop4): Found nat_bits in checkpoint F2FS-fs (loop4): Mounted with checkpoint version = 48b305e4 audit: type=1800 audit(1672682759.818:180): pid=12997 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="loop4" ino=10 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. F2FS-fs (loop1): invalid crc value F2FS-fs (loop1): Found nat_bits in checkpoint F2FS-fs (loop5): invalid crc value audit: type=1800 audit(1672682760.208:181): pid=13006 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="loop1" ino=10 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. audit: type=1800 audit(1672682760.398:182): pid=13065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="loop2" ino=10 res=0 audit: type=1800 audit(1672682760.498:183): pid=13093 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="loop5" ino=10 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent audit: type=1800 audit(1672682762.478:184): pid=13196 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="loop3" ino=10 res=0 nla_parse: 1 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1800 audit(1672682762.848:185): pid=13245 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="loop1" ino=10 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1800 audit(1672682762.858:186): pid=13238 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=14330 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. audit: type=1800 audit(1672682763.178:187): pid=13251 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="loop2" ino=10 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: option "workdir=./bus" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent f2fs_msg: 22 callbacks suppressed F2FS-fs (loop3): invalid crc value F2FS-fs (loop3): Found nat_bits in checkpoint F2FS-fs (loop3): Mounted with checkpoint version = 48b305e4 audit: type=1800 audit(1672682764.769:188): pid=13313 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="loop3" ino=10 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. F2FS-fs (loop3): sanity_check_inode: inode (ino=7) has corrupted i_extra_isize: 36, max: 24 F2FS-fs (loop1): invalid crc value audit: type=1800 audit(1672682765.189:189): pid=13317 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13905 res=0 F2FS-fs (loop1): Found nat_bits in checkpoint netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. F2FS-fs (loop1): Mounted with checkpoint version = 48b305e4