REISERFS (device loop0): Using r5 hash to sort names REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc8-syzkaller-00154-g296a7b7eb792 #0 Not tainted ------------------------------------------------------ syz-executor163/3636 is trying to acquire lock: ffff8880264fc460 (sb_writers#9){.+.+}-{0:0}, at: reiserfs_ioctl+0x1a2/0x330 fs/reiserfs/ioctl.c:103 but task is already holding lock: ffff888018227090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sbi->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747 reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 reiserfs_lookup+0x175/0x490 fs/reiserfs/namei.c:364 __lookup_slow+0x24c/0x460 fs/namei.c:1685 lookup_one_len+0x16e/0x1a0 fs/namei.c:2711 reiserfs_lookup_privroot+0x96/0x290 fs/reiserfs/xattr.c:973 reiserfs_fill_super+0x20e9/0x2e90 fs/reiserfs/super.c:2174 mount_bdev+0x351/0x410 fs/super.c:1401 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x132a/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&type->i_mutex_dir_key#6){+.+.}-{3:3}: down_write+0x94/0x220 kernel/locking/rwsem.c:1562 inode_lock include/linux/fs.h:756 [inline] open_last_lookups fs/namei.c:3478 [inline] path_openat+0x930/0x2860 fs/namei.c:3711 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (sb_writers#9){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1826 [inline] sb_start_write include/linux/fs.h:1901 [inline] mnt_want_write_file+0x92/0x590 fs/namespace.c:437 reiserfs_ioctl+0x1a2/0x330 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: sb_writers#9 --> &type->i_mutex_dir_key#6 --> &sbi->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->lock); lock(&type->i_mutex_dir_key#6); lock(&sbi->lock); lock(sb_writers#9); *** DEADLOCK *** 1 lock held by syz-executor163/3636: #0: ffff888018227090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 stack backtrace: CPU: 1 PID: 3636 Comm: syz-executor163 Not tainted 6.1.0-rc8-syzkaller-00154-g296a7b7eb792 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1826 [inline] sb_start_write include/linux/fs.h:1901 [inline] mnt_want_write_file+0x92/0x590 fs/namespace.c:437 reiserfs_ioctl+0x1a2/0x330 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd636584ad9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe8d904b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd636584ad9 RDX: 0000000000000000 RSI: 0000000040087602 RDI: 0000000000000005 RBP: 00007fd6365440e0 R08: 0000000000000000 R09: 0000000000000000