REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 6.1.46-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/814 is trying to acquire lock: ffff88808cad96c0 (&type->i_mutex_dir_key#19){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] ffff88808cad96c0 (&type->i_mutex_dir_key#19){++++}-{3:3}, at: open_last_lookups fs/namei.c:3478 [inline] ffff88808cad96c0 (&type->i_mutex_dir_key#19){++++}-{3:3}, at: path_openat+0x7b6/0x2e60 fs/namei.c:3711 but task is already holding lock: ffff88803c1ac460 (sb_writers#35){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_writers#35){.+.+}-{0:0}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1832 [inline] sb_start_write+0x4d/0x1c0 include/linux/fs.h:1907 mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:437 reiserfs_ioctl+0x170/0x340 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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&sbi->lock){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 reiserfs_write_lock+0x76/0xd0 fs/reiserfs/lock.c:27 reiserfs_lookup+0x15c/0x4b0 fs/reiserfs/namei.c:364 __lookup_slow+0x27e/0x3d0 fs/namei.c:1685 lookup_one_len+0x187/0x2d0 fs/namei.c:2711 reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:973 reiserfs_fill_super+0x1957/0x2620 fs/reiserfs/super.c:2192 mount_bdev+0x2c9/0x3f0 fs/super.c:1432 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1562 do_new_mount+0x28b/0xae0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&type->i_mutex_dir_key#19){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:756 [inline] open_last_lookups fs/namei.c:3478 [inline] path_openat+0x7b6/0x2e60 fs/namei.c:3711 do_filp_open+0x230/0x480 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &type->i_mutex_dir_key#19 --> &sbi->lock --> sb_writers#35 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#35); lock(&sbi->lock); lock(sb_writers#35); lock(&type->i_mutex_dir_key#19); *** DEADLOCK *** 1 lock held by syz-executor.3/814: #0: ffff88803c1ac460 (sb_writers#35){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 stack backtrace: CPU: 1 PID: 814 Comm: syz-executor.3 Not tainted 6.1.46-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/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+0x1667/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:756 [inline] open_last_lookups fs/namei.c:3478 [inline] path_openat+0x7b6/0x2e60 fs/namei.c:3711 do_filp_open+0x230/0x480 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4d5da7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4d5e78c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4d5db9bf80 RCX: 00007f4d5da7cae9 RDX: 000000000000275a RSI: 0000000020000140 RDI: ffffffffffffff9c RBP: 00007f4d5dac847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4d5db9bf80 R15: 00007ffe2906d148