syzbot

reiserfs: enabling write barrier flush mode
REISERFS warning (device loop3): jdm-20006 create_privroot: xattrs/ACLs enabled and couldn't find/create .reiserfs_priv. Failing mount.
======================================================
WARNING: possible circular locking dependency detected
6.3.0-rc7-syzkaller-00060-g789b4a41c247 #0 Not tainted
------------------------------------------------------
syz-executor.3/9269 is trying to acquire lock:
ffff888029a47090 (
&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27

but task is already holding lock:
ffff88803568a460 (sb_writers#33){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2181 [inline]
ffff88803568a460 (sb_writers#33){.+.+}-{0:0}, at: iterate_dir+0x488/0x570 fs/readdir.c:70

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (sb_writers#33){.+.+}-{0:0}:
       lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1477 [inline]
       sb_start_write+0x4d/0x1c0 include/linux/fs.h:1552
       mnt_want_write_file+0x5e/0x1f0 fs/namespace.c:438
       reiserfs_ioctl+0x174/0x340 fs/reiserfs/ioctl.c:103
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&sbi->lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3098 [inline]
       check_prevs_add kernel/locking/lockdep.c:3217 [inline]
       validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
       lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669
       __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
       reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
       reiserfs_dirty_inode+0xf2/0x240 fs/reiserfs/super.c:704
       __mark_inode_dirty+0x305/0xd90 fs/fs-writeback.c:2421
       generic_update_time fs/inode.c:1860 [inline]
       inode_update_time fs/inode.c:1873 [inline]
       touch_atime+0x3fe/0x680 fs/inode.c:1945
       file_accessed include/linux/fs.h:2181 [inline]
       iterate_dir+0x488/0x570 fs/readdir.c:70
       __do_sys_getdents64 fs/readdir.c:369 [inline]
       __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:354
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sb_writers#33);
                               lock(&sbi->lock);
                               lock(sb_writers#33);
  lock(&sbi->lock);

 *** DEADLOCK ***

3 locks held by syz-executor.3/9269:
 #0: ffff8880215bdc68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x254/0x2f0 fs/file.c:1047
 #1: ffff8880351e1d60 (&type->i_mutex_dir_key#22){++++}-{3:3}, at: iterate_dir+0x10e/0x570 fs/readdir.c:55
 #2: ffff88803568a460 (sb_writers#33){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2181 [inline]
 #2: ffff88803568a460 (sb_writers#33){.+.+}-{0:0}, at: iterate_dir+0x488/0x570 fs/readdir.c:70

stack backtrace:
CPU: 0 PID: 9269 Comm: syz-executor.3 Not tainted 6.3.0-rc7-syzkaller-00060-g789b4a41c247 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3098 [inline]
 check_prevs_add kernel/locking/lockdep.c:3217 [inline]
 validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669
 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
 reiserfs_dirty_inode+0xf2/0x240 fs/reiserfs/super.c:704
 __mark_inode_dirty+0x305/0xd90 fs/fs-writeback.c:2421
 generic_update_time fs/inode.c:1860 [inline]
 inode_update_time fs/inode.c:1873 [inline]
 touch_atime+0x3fe/0x680 fs/inode.c:1945
 file_accessed include/linux/fs.h:2181 [inline]
 iterate_dir+0x488/0x570 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb90a48c169
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:00007fb90b10f168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fb90a5abf80 RCX: 00007fb90a48c169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007fb90a4e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffebceef3bf R14: 00007fb90b10f300 R15: 0000000000022000
 </TASK>