BTRFS warning (device loop0): excessive commit interval 622039222 BTRFS info (device loop0): force zlib compression, level 3 BTRFS info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/12547 is trying to acquire lock: 0000000092ade5ae (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 000000009757836e (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000009757836e (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_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+0x114/0x170 fs/btrfs/ioctl.c:1819 btrfs_ioctl+0x274b/0x76d0 fs/btrfs/ioctl.c:5932 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 *** 4 locks held by syz-executor.0/12547: #0: 00000000fed779d1 (sb_writers#21){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000fed779d1 (sb_writers#21){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000001aa0e757 (&type->i_mutex_dir_key#11/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 000000003232e4b2 (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 000000009757836e (sb_internal#4){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 000000009757836e (sb_internal#4){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 12547 Comm: syz-executor.0 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+0x114/0x170 fs/btrfs/ioctl.c:1819 btrfs_ioctl+0x274b/0x76d0 fs/btrfs/ioctl.c:5932 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: 0033:0x7fed8c2bd0c9 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:00007fed8a82f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fed8c3dcf80 RCX: 00007fed8c2bd0c9 RDX: 00000000200000c0 RSI: 000000005000940e RDI: 0000000000000005 RBP: 00007fed8c318ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff764c992f R14: 00007fed8a82f300 R15: 0000000000022000 audit: type=1804 audit(1674114625.812:19): pid=12612 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/66/file0/bus" dev="loop4" ino=7 res=1 audit: type=1804 audit(1674114625.882:20): pid=12663 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/66/file0/bus" dev="loop4" ino=7 res=1 audit: type=1804 audit(1674114626.592:21): pid=12689 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3640407082/syzkaller.XZHJR1/66/file0/bus" dev="loop1" ino=7 res=1 audit: type=1804 audit(1674114626.642:22): pid=12696 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/67/file0/bus" dev="loop4" ino=7 res=1 audit: type=1804 audit(1674114626.692:23): pid=12709 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir3640407082/syzkaller.XZHJR1/66/file0/bus" dev="loop1" ino=7 res=1 audit: type=1804 audit(1674114626.732:24): pid=12710 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/67/file0/bus" dev="loop4" ino=7 res=1 audit: type=1804 audit(1674114627.622:25): pid=12740 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/68/file0/bus" dev="loop4" ino=7 res=1 audit: type=1804 audit(1674114627.712:26): pid=12748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/68/file0/bus" dev="loop4" ino=7 res=1 audit: type=1804 audit(1674114627.792:27): pid=12732 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3640407082/syzkaller.XZHJR1/67/file0/bus" dev="loop1" ino=7 res=1 audit: type=1804 audit(1674114627.862:28): pid=12762 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir3640407082/syzkaller.XZHJR1/67/file0/bus" dev="loop1" ino=7 res=1 EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed mblk_io_submit option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Unsupported blocksize for fs encryption kauditd_printk_skb: 16 callbacks suppressed audit: type=1804 audit(1674114630.833:45): pid=12893 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir941103069/syzkaller.a9eErd/77/file0/bus" dev="loop2" ino=7 res=1 audit: type=1804 audit(1674114630.933:46): pid=12943 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir941103069/syzkaller.a9eErd/77/file0/bus" dev="loop2" ino=7 res=1 audit: type=1804 audit(1674114630.983:47): pid=12913 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir1347274151/syzkaller.g9A84M/71/file0/bus" dev="loop0" ino=7 res=1 audit: type=1804 audit(1674114631.063:48): pid=12948 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir1347274151/syzkaller.g9A84M/71/file0/bus" dev="loop0" ino=7 res=1 EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed mblk_io_submit option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Unsupported blocksize for fs encryption audit: type=1804 audit(1674114631.483:49): pid=12937 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir2122131878/syzkaller.Ouh9QR/93/file0/bus" dev="loop5" ino=7 res=1 audit: type=1804 audit(1674114631.543:50): pid=12934 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3640407082/syzkaller.XZHJR1/70/file0/bus" dev="loop1" ino=7 res=1 audit: type=1804 audit(1674114631.583:51): pid=12942 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/72/file0/bus" dev="loop4" ino=7 res=1 audit: type=1804 audit(1674114631.583:52): pid=12975 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir2122131878/syzkaller.Ouh9QR/93/file0/bus" dev="loop5" ino=7 res=1 EXT4-fs (loop3): Ignoring removed nobh option audit: type=1804 audit(1674114631.613:53): pid=12978 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir3640407082/syzkaller.XZHJR1/70/file0/bus" dev="loop1" ino=7 res=1 EXT4-fs (loop3): Ignoring removed mblk_io_submit option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Unsupported blocksize for fs encryption audit: type=1804 audit(1674114631.643:54): pid=12981 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir3280966956/syzkaller.BME4gJ/72/file0/bus" dev="loop4" ino=7 res=1 EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed mblk_io_submit option EXT4-fs (loop4): Ignoring removed mblk_io_submit option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop3): Unsupported blocksize for fs encryption EXT4-fs (loop4): Unsupported blocksize for fs encryption EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop2): Ignoring removed mblk_io_submit option EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop2): Unsupported blocksize for fs encryption EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop4): Ignoring removed mblk_io_submit option EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop4): Unsupported blocksize for fs encryption EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed mblk_io_submit option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop0): Ignoring removed nobh option EXT4-fs (loop0): Ignoring removed mblk_io_submit option EXT4-fs (loop2): Ignoring removed mblk_io_submit option EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop2): Unsupported blocksize for fs encryption EXT4-fs (loop3): Unsupported blocksize for fs encryption EXT4-fs (loop0): Ignoring removed nobh option EXT4-fs (loop0): Unsupported blocksize for fs encryption EXT4-fs (loop1): Ignoring removed nobh option EXT4-fs (loop1): Ignoring removed mblk_io_submit option EXT4-fs (loop5): Ignoring removed nobh option EXT4-fs (loop5): Ignoring removed mblk_io_submit option EXT4-fs (loop1): Ignoring removed nobh option EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop1): Unsupported blocksize for fs encryption EXT4-fs (loop5): Ignoring removed nobh option EXT4-fs (loop4): Ignoring removed mblk_io_submit option EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop5): Unsupported blocksize for fs encryption EXT4-fs (loop4): Unsupported blocksize for fs encryption EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed mblk_io_submit option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop3): Unsupported blocksize for fs encryption EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop2): Ignoring removed mblk_io_submit option EXT4-fs (loop0): Ignoring removed nobh option EXT4-fs (loop0): Ignoring removed mblk_io_submit option EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop0): Ignoring removed nobh option EXT4-fs (loop1): Ignoring removed nobh option EXT4-fs (loop2): Unsupported blocksize for fs encryption EXT4-fs (loop0): Unsupported blocksize for fs encryption EXT4-fs (loop1): Ignoring removed mblk_io_submit option EXT4-fs (loop1): Ignoring removed nobh option EXT4-fs (loop1): Unsupported blocksize for fs encryption EXT4-fs (loop5): Ignoring removed nobh option EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop5): Ignoring removed mblk_io_submit option EXT4-fs (loop4): Ignoring removed mblk_io_submit option EXT4-fs (loop3): Ignoring removed mblk_io_submit option EXT4-fs (loop5): Ignoring removed nobh option EXT4-fs (loop4): Ignoring removed nobh option EXT4-fs (loop3): Ignoring removed nobh option EXT4-fs (loop5): Unsupported blocksize for fs encryption EXT4-fs (loop4): Unsupported blocksize for fs encryption EXT4-fs (loop3): Unsupported blocksize for fs encryption EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop2): Ignoring removed mblk_io_submit option EXT4-fs (loop2): Ignoring removed nobh option EXT4-fs (loop1): Ignoring removed nobh option EXT4-fs (loop1): Ignoring removed mblk_io_submit option EXT4-fs (loop2): Unsupported blocksize for fs encryption EXT4-fs (loop1): Ignoring removed nobh option