audit: type=1804 audit(1675602642.022:11): pid=9984 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir1390619927/syzkaller.SThdtL/4/bus" dev="sda1" ino=13900 res=1 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/9869 is trying to acquire lock: 00000000d8afe1c8 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 but task is already holding lock: 000000009aab6bc3 (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000009aab6bc3 (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.2/9869: #0: 00000000bd3c0222 (sb_writers#15){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000bd3c0222 (sb_writers#15){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000009aab6bc3 (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 000000009aab6bc3 (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 9869 Comm: syz-executor.2 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_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 BTRFS error (device loop2): fail to start transaction for status update: -28 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: 0033:0x7fa3017730c9 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 dccp_close: ABORT with 3 bytes unread RSP: 002b:00007fa2ffce5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa301892f80 RCX: 00007fa3017730c9 RDX: 0000000020001340 RSI: 000000008030942b RDI: 0000000000000004 RBP: 00007fa3017ceae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe753df3ff R14: 00007fa2ffce5300 R15: 0000000000022000 MTD: Attempt to mount non-MTD device "/dev/loop4" cramfs: wrong endianness MTD: Attempt to mount non-MTD device "/dev/loop4" cramfs: wrong endianness BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): trying to use backup root at mount time BTRFS info (device loop2): use zlib compression, level 3 BTRFS info (device loop2): enabling ssd optimizations BTRFS info (device loop2): using spread ssd allocation scheme BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents IPVS: ftp: loaded support on port[0] = 21 F2FS-fs (loop1): Test dummy encryption mount option ignored F2FS-fs (loop1): invalid crc value F2FS-fs (loop1): Found nat_bits in checkpoint F2FS-fs (loop1): Mounted with checkpoint version = 48b305e5 BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): trying to use backup root at mount time BTRFS info (device loop2): use zlib compression, level 3 BTRFS info (device loop2): enabling ssd optimizations BTRFS info (device loop2): using spread ssd allocation scheme BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents dccp_close: ABORT with 3 bytes unread dccp_close: ABORT with 3 bytes unread dccp_close: ABORT with 3 bytes unread 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 kauditd_printk_skb: 17 callbacks suppressed audit: type=1804 audit(1675602644.993:29): pid=10332 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir1064326833/syzkaller.985Rdb/6/memory.events" dev="sda1" ino=13885 res=1 BTRFS info (device loop3): using spread ssd allocation scheme audit: type=1800 audit(1675602644.993:30): pid=10332 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="memory.events" dev="sda1" ino=13885 res=0 BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents dccp_close: ABORT with 3 bytes unread audit: type=1804 audit(1675602645.163:31): pid=10355 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir1064326833/syzkaller.985Rdb/7/memory.events" dev="sda1" ino=13885 res=1 audit: type=1800 audit(1675602645.163:32): pid=10355 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="memory.events" dev="sda1" ino=13885 res=0 BTRFS error (device loop3): fail to start transaction for status update: -28 audit: type=1804 audit(1675602645.363:33): pid=10375 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir1390619927/syzkaller.SThdtL/7/memory.events" dev="sda1" ino=13934 res=1 audit: type=1800 audit(1675602645.363:34): pid=10375 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="memory.events" dev="sda1" ino=13934 res=0 xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it syz-executor.5 (10423) used greatest stack depth: 22848 bytes left audit: type=1804 audit(1675602646.173:35): pid=10439 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir1064326833/syzkaller.985Rdb/8/memory.events" dev="sda1" ino=13938 res=1 audit: type=1800 audit(1675602646.173:36): pid=10439 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="memory.events" dev="sda1" ino=13938 res=0 xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. xt_ct_set_helper: 4 callbacks suppressed xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it nla_parse: 2 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters.