====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/12234 is trying to acquire lock: 00000000f557bd9b (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 but task is already holding lock: 0000000055a7c66c (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 0000000055a7c66c (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_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#3); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 2 locks held by syz-executor.3/12234: #0: 00000000f462fedb (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000f462fedb (sb_writers#20){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 0000000055a7c66c (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 0000000055a7c66c (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 12234 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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 IPVS: ftp: loaded support on port[0] = 21 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 XFS (loop5): Mounting V4 Filesystem 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 XFS (loop5): Ending clean mount entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f45eb8660c9 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:00007f45e9dd8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f45eb985f80 RCX: 00007f45eb8660c9 RDX: 0000000020001340 RSI: 000000008030942b RDI: 0000000000000004 RBP: 00007f45eb8c1ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffea920eabf R14: 00007f45e9dd8300 R15: 0000000000022000 BTRFS error (device loop3): fail to start transaction for status update: -28 XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Unmounting Filesystem XFS (loop5): Unmounting Filesystem IPVS: ftp: loaded support on port[0] = 21 BTRFS info (device loop3): enabling inode map caching BTRFS info (device loop3): trying to use backup root at mount time BTRFS info (device loop3): use zlib compression, level 3 BTRFS info (device loop3): enabling ssd optimizations BTRFS info (device loop3): using spread ssd allocation scheme BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (12428) BTRFS error (device loop3): fail to start transaction for status update: -28 IPVS: ftp: loaded support on port[0] = 21 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (12479) XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount kauditd_printk_skb: 11 callbacks suppressed audit: type=1804 audit(1675521854.243:49): pid=12412 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1244546428/syzkaller.RiipcG/77/file0/bus" dev="loop5" ino=41 res=1 XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount audit: type=1800 audit(1675521854.243:50): pid=12412 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="loop5" ino=41 res=0 audit: type=1804 audit(1675521854.313:51): pid=12385 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2704067648/syzkaller.57hA7Q/91/bus" dev="sda1" ino=14287 res=1 audit: type=1800 audit(1675521854.323:52): pid=12385 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14287 res=0 audit: type=1804 audit(1675521854.383:53): pid=12535 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir1244546428/syzkaller.RiipcG/77/file0/bus" dev="loop5" ino=41 res=1 XFS (loop5): Unmounting Filesystem BTRFS info (device loop4): enabling inode map caching syz-executor.0 (12398) used greatest stack depth: 21104 bytes left BTRFS info (device loop4): trying to use backup root at mount time audit: type=1804 audit(1675521854.413:54): pid=12536 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir2704067648/syzkaller.57hA7Q/91/bus" dev="sda1" ino=14287 res=1 BTRFS info (device loop4): use zlib compression, level 3 BTRFS info (device loop4): enabling ssd optimizations BTRFS info (device loop4): using spread ssd allocation scheme XFS (loop0): Unmounting Filesystem BTRFS info (device loop4): using free space tree audit: type=1804 audit(1675521854.543:55): pid=12398 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir1066957045/syzkaller.axO4TD/88/file0/bus" dev="loop0" ino=41 res=1 BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (12521) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (12558) audit: type=1800 audit(1675521854.543:56): pid=12398 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="loop0" ino=41 res=0 audit: type=1804 audit(1675521854.663:57): pid=12542 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir1066957045/syzkaller.axO4TD/88/file0/bus" dev="loop0" ino=41 res=1 BTRFS error (device loop4): fail to start transaction for status update: -28 BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (12545) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (12597) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (12569) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (12598) mac80211_hwsim hwsim12 : renamed from wlan1 BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): trying to use backup root at mount time BTRFS info (device loop4): use zlib compression, level 3 BTRFS info (device loop4): enabling ssd optimizations BTRFS info (device loop4): using spread ssd allocation scheme BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (12604) BTRFS info (device loop4): using free space tree BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (12677) BTRFS info (device loop4): has skinny extents BTRFS error (device loop4): fail to start transaction for status update: -28 BTRFS info (device loop1): enabling inode map caching BTRFS info (device loop1): trying to use backup root at mount time BTRFS info (device loop1): use zlib compression, level 3 BTRFS info (device loop1): enabling ssd optimizations BTRFS info (device loop1): using spread ssd allocation scheme BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents BTRFS error (device loop1): fail to start transaction for status update: -28 ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 Unknown ioctl -2147200256 Unknown ioctl -1068477616 Unknown ioctl -2147200256 Unknown ioctl -1068477616 Unknown ioctl -2147200256 Unknown ioctl -1068477616 Unknown ioctl -2147200256 Unknown ioctl -1068477616 Unknown ioctl -2147200256 Unknown ioctl -2147200256 Unknown ioctl -1068477616 Unknown ioctl -1068477616 Unknown ioctl -2147200256 Unknown ioctl -2147200256 Unknown ioctl -1068477616 Unknown ioctl -2147200256 Unknown ioctl -1068477616 Unknown ioctl -1068477616 Unknown ioctl -2147200256 Unknown ioctl -1068477616