audit: type=1804 audit(1674966174.283:11989): pid=14705 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/77/file0/bus" dev="loop1" ino=8 res=1 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/14604 is trying to acquire lock: 000000003d9db843 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 00000000fd53566f (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 00000000fd53566f (sb_internal#2){.+.+}, 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#2){.+.+}: 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#2); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#2); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 4 locks held by syz-executor.3/14604: #0: 00000000efc0c915 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000efc0c915 (sb_writers#14){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000008ef15e0c (&type->i_mutex_dir_key#8/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 0000000032349aac (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 00000000fd53566f (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 00000000fd53566f (sb_internal#2){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 14604 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 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: 0033:0x7f286d2af0c9 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:00007f286b821168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f286d3cef80 RCX: 00007f286d2af0c9 RDX: 0000000020000a80 RSI: 0000000050009418 RDI: 0000000000000004 RBP: 00007f286d30aae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffea0f6ab6f R14: 00007f286b821300 R15: 0000000000022000 wlan1: Trigger new scan to find an IBSS to join attempt to access beyond end of device loop1: rw=1, want=2064, limit=2048 BTRFS info (device loop3): unrecognized mount option 'ÿî§<< G4š¶mRŸ±â½ÆuÆÌëê0º‰wÆ2ÝËàíù†¶Žæ' REISERFS (device loop2): found reiserfs format "3.5" with non-standard journal REISERFS (device loop2): using ordered data mode reiserfs: using flush barriers REISERFS (device loop2): journal params: device loop2, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names REISERFS (device loop2): found reiserfs format "3.5" with non-standard journal REISERFS (device loop2): using ordered data mode reiserfs: using flush barriers REISERFS (device loop2): journal params: device loop2, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names audit: type=1804 audit(1674966176.563:11990): pid=14751 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/78/file0/bus" dev="loop1" ino=9 res=1 attempt to access beyond end of device loop1: rw=1, want=2064, limit=2048 audit: type=1804 audit(1674966176.643:11991): pid=14782 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/78/file0/bus" dev="loop1" ino=9 res=1 REISERFS (device loop2): found reiserfs format "3.5" with non-standard journal REISERFS (device loop2): using ordered data mode reiserfs: using flush barriers REISERFS (device loop2): journal params: device loop2, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop2): Using r5 hash to sort names audit: type=1804 audit(1674966177.093:11992): pid=14818 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/79/bus" dev="sda1" ino=14473 res=1 audit: type=1804 audit(1674966177.093:11993): pid=14818 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/79/bus" dev="sda1" ino=14473 res=1 BTRFS info (device loop3): enabling inode map caching BTRFS warning (device loop3): excessive commit interval 620990646 BTRFS info (device loop3): force zlib compression, level 3 audit: type=1804 audit(1674966177.093:11994): pid=14818 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/79/bus" dev="sda1" ino=14473 res=1 BTRFS info (device loop3): using free space tree UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) BTRFS info (device loop3): has skinny extents audit: type=1804 audit(1674966177.093:11995): pid=14818 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/79/bus" dev="sda1" ino=14473 res=1 audit: type=1804 audit(1674966177.093:11996): pid=14818 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/79/bus" dev="sda1" ino=14473 res=1 audit: type=1804 audit(1674966177.093:11997): pid=14818 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir734976256/syzkaller.qOP2vB/79/bus" dev="sda1" ino=14473 res=1 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) BTRFS info (device loop3): unrecognized mount option 'ÿî§<< G4š¶mRŸ±â½ÆuÆÌëê0º‰wÆ2ÝËàíù†¶Žæ' wlan1: Trigger new scan to find an IBSS to join UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) BTRFS info (device loop3): enabling inode map caching BTRFS warning (device loop3): excessive commit interval 620990646 BTRFS info (device loop3): force zlib compression, level 3 BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (14934) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (14946) BTRFS info (device loop3): unrecognized mount option 'ÿî§<< G4š¶mRŸ±â½ÆuÆÌëê0º‰wÆ2ÝËàíù†¶Žæ' BTRFS info (device loop3): enabling inode map caching wlan1: Trigger new scan to find an IBSS to join BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (14983) BTRFS warning (device loop3): excessive commit interval 620990646 BTRFS info (device loop3): force zlib compression, level 3 BTRFS info (device loop3): using free space tree BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (15021) BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): unrecognized mount option 'ÿî§<< G4š¶mRŸ±â½ÆuÆÌëê0º‰wÆ2ÝËàíù†¶Žæ' wlan1: Creating new IBSS network, BSSID a6:50:d0:98:8c:4b BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 620990646 BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (15074) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (15118) BTRFS info (device loop2): unrecognized mount option 'ÿî§<< G4š¶mRŸ±â½ÆuÆÌëê0º‰wÆ2ÝËàíù†¶Žæ'