REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.6.0-next-20231103-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor975/5068 is trying to acquire lock:
ffff888078ea02e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
ffff888078ea02e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: vfs_setxattr+0x123/0x350 fs/xattr.c:321
but task is already holding lock:
ffff8880798aa418 (sb_writers#9){.+.+}-{0:0}, at: path_setxattr+0xc3/0x1d0 fs/xattr.c:670
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (sb_writers#9){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1635 [inline]
sb_start_write include/linux/fs.h:1710 [inline]
mnt_want_write_file+0x98/0x600 fs/namespace.c:448
reiserfs_ioctl+0x194/0x2e0 fs/reiserfs/ioctl.c:103
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
-> #1 (&sbi->lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x181/0x1330 kernel/locking/mutex.c:747
reiserfs_write_lock+0x78/0x100 fs/reiserfs/lock.c:27
reiserfs_lookup+0x184/0x690 fs/reiserfs/namei.c:364
__lookup_slow+0x24d/0x450 fs/namei.c:1694
lookup_one_len+0x17d/0x1b0 fs/namei.c:2746
reiserfs_lookup_privroot+0x94/0x200 fs/reiserfs/xattr.c:977
reiserfs_fill_super+0x20f9/0x3150 fs/reiserfs/super.c:2174
mount_bdev+0x1df/0x2d0 fs/super.c:1650
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8c/0x370 fs/super.c:1771
do_new_mount fs/namespace.c:3337 [inline]
path_mount+0x148e/0x1ed0 fs/namespace.c:3664
do_mount fs/namespace.c:3677 [inline]
__do_sys_mount fs/namespace.c:3886 [inline]
__se_sys_mount fs/namespace.c:3863 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:3863
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
-> #0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x2e22/0x5dc0 kernel/locking/lockdep.c:5136
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
down_write+0x93/0x200 kernel/locking/rwsem.c:1579
inode_lock include/linux/fs.h:802 [inline]
vfs_setxattr+0x123/0x350 fs/xattr.c:321
do_setxattr+0x142/0x170 fs/xattr.c:630
setxattr+0x159/0x170 fs/xattr.c:653
path_setxattr+0x175/0x1d0 fs/xattr.c:672
__do_sys_setxattr fs/xattr.c:688 [inline]
__se_sys_setxattr fs/xattr.c:684 [inline]
__x64_sys_setxattr+0xc4/0x160 fs/xattr.c:684
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
other info that might help us debug this:
Chain exists of:
&type->i_mutex_dir_key#6 --> &sbi->lock --> sb_writers#9
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(sb_writers#9);
lock(&sbi->lock);
lock(sb_writers#9);
lock(&type->i_mutex_dir_key#6);
*** DEADLOCK ***
1 lock held by syz-executor975/5068:
#0: ffff8880798aa418 (sb_writers#9){.+.+}-{0:0}, at: path_setxattr+0xc3/0x1d0 fs/xattr.c:670
stack backtrace:
CPU: 1 PID: 5068 Comm: syz-executor975 Not tainted 6.6.0-next-20231103-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
check_noncircular+0x310/0x3f0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x2e22/0x5dc0 kernel/locking/lockdep.c:5136
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
down_write+0x93/0x200 kernel/locking/rwsem.c:1579
inode_lock include/linux/fs.h:802 [inline]
vfs_setxattr+0x123/0x350 fs/xattr.c:321
do_setxattr+0x142/0x170 fs/xattr.c:630
setxattr+0x159/0x170 fs/xattr.c:653
path_setxattr+0x175/0x1d0 fs/xattr.c:672
__do_sys_setxattr fs/xattr.c:688 [inline]
__se_sys_setxattr fs/xattr.c:684 [inline]
__x64_sys_setxattr+0xc4/0x160 fs/xattr.c:684
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f692ca7c609
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:0000