reiserfs: using flush barriers
REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (loop3)
REISERFS (device loop3): Using r5 hash to sort names
======================================================
WARNING: possible circular locking dependency detected
4.14.301-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/12481 is trying to acquire lock:
 (sb_writers#14){.+.+}, at: [<ffffffff818e201d>] sb_start_write include/linux/fs.h:1551 [inline]
 (sb_writers#14){.+.+}, at: [<ffffffff818e201d>] mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497

but task is already holding lock:
 (&sbi->lock){+.+.}, at: [<ffffffff81b3fb55>] reiserfs_write_lock+0x75/0xf0 fs/reiserfs/lock.c:27

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&sbi->lock){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
       reiserfs_write_lock+0x75/0xf0 fs/reiserfs/lock.c:27
       reiserfs_lookup+0x130/0x400 fs/reiserfs/namei.c:363
       lookup_real fs/namei.c:1555 [inline]
       __lookup_hash fs/namei.c:1575 [inline]
       __lookup_hash+0x1bb/0x270 fs/namei.c:1563
       lookup_one_len+0x279/0x3a0 fs/namei.c:2539
       reiserfs_lookup_privroot+0x92/0x270 fs/reiserfs/xattr.c:970
       reiserfs_fill_super+0x1d12/0x2990 fs/reiserfs/super.c:2187
       mount_bdev+0x2b3/0x360 fs/super.c:1134
       mount_fs+0x92/0x2a0 fs/super.c:1237
       vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
       vfs_kern_mount fs/namespace.c:1036 [inline]
       do_new_mount fs/namespace.c:2572 [inline]
       do_mount+0xe65/0x2a30 fs/namespace.c:2905
       SYSC_mount fs/namespace.c:3121 [inline]
       SyS_mount+0xa8/0x120 fs/namespace.c:3098
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

-> #1 (&type->i_mutex_dir_key#10){+.+.}:
       down_write+0x34/0x90 kernel/locking/rwsem.c:54
       inode_lock include/linux/fs.h:719 [inline]
       do_last fs/namei.c:3331 [inline]
       path_openat+0xde2/0x2970 fs/namei.c:3571
       do_filp_open+0x179/0x3c0 fs/namei.c:3605
       do_sys_open+0x296/0x410 fs/open.c:1081
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

-> #0 (sb_writers#14){.+.+}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
       __sb_start_write+0x64/0x260 fs/super.c:1342
       sb_start_write include/linux/fs.h:1551 [inline]
       mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497
       reiserfs_ioctl+0x18e/0x8b0 fs/reiserfs/ioctl.c:110
       vfs_ioctl fs/ioctl.c:46 [inline]
       file_ioctl fs/ioctl.c:500 [inline]
       do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
       SYSC_ioctl fs/ioctl.c:701 [inline]
       SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

other info that might help us debug this:

Chain exists of:
  sb_writers#14 --> &type->i_mutex_dir_key#10 --> &sbi->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->lock);
                               lock(&type->i_mutex_dir_key#10);
                               lock(&sbi->lock);
  lock(sb_writers#14);

 *** DEADLOCK ***

1 lock held by syz-executor.3/12481:
 #0:  (&sbi->lock){+.+.}, at: [<ffffffff81b3fb55>] reiserfs_write_lock+0x75/0xf0 fs/reiserfs/lock.c:27

stack backtrace:
CPU: 0 PID: 12481 Comm: syz-executor.3 Not tainted 4.14.301-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1905 [inline]
 check_prevs_add kernel/locking/lockdep.c:2022 [inline]
 validate_chain kernel/locking/lockdep.c:2464 [inline]
 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x64/0x260 fs/super.c:1342
 sb_start_write include/linux/fs.h:1551 [inline]
 mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497
 reiserfs_ioctl+0x18e/0x8b0 fs/reiserfs/ioctl.c:110
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f102b9a90d9
RSP: 002b:00007f1029f1b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f102bac8f80 RCX: 00007f102b9a90d9
RDX: 0000000000000000 RSI: 0000000040087602 RDI: 0000000000000003
RBP: 00007f102ba04ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffef4b1163f R14: 00007f1029f1b300 R15: 0000000000022000
REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop3): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (loop3)
REISERFS (device loop3): Using r5 hash to sort names
REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop3): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (loop3)
REISERFS (device loop3): Using r5 hash to sort names
REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop3): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (loop3)
REISERFS (device loop3): Using r5 hash to sort names
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop0): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
PF_BRIDGE: br_mdb_parse() with invalid entry
PF_BRIDGE: br_mdb_parse() with invalid entry
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop5): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop0): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop4): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs error (device loop2): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop0): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs error (device loop5): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs error (device loop4): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs error (device loop2): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop0): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs error (device loop4): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop5): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
EXT4-fs error (device loop2): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 96 vs 11030 free clusters
nla_parse: 3 callbacks suppressed
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'.
gfs2: fsid=syz:syz: Trying to join cluster "lock_dlm", "syz:syz"
dlm: no local IP address has been set
dlm: cannot start dlm lowcomms -107
gfs2: fsid=syz:syz: dlm_new_lockspace error -107
gfs2: fsid=syz:syz: Trying to join cluster "lock_dlm", "syz:syz"
dlm: no local IP address has been set
dlm: cannot start dlm lowcomms -107
gfs2: fsid=syz:syz: dlm_new_lockspace error -107
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'.
gfs2: fsid=syz:syz: Trying to join cluster "lock_dlm", "syz:syz"
dlm: no local IP address has been set
dlm: cannot start dlm lowcomms -107
gfs2: fsid=syz:syz: dlm_new_lockspace error -107
gfs2: fsid=syz:syz: Trying to join cluster "lock_dlm", "syz:syz"
dlm: no local IP address has been set
dlm: cannot start dlm lowcomms -107
gfs2: fsid=syz:syz: dlm_new_lockspace error -107
caif:caif_disconnect_client(): nothing to disconnect