REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using rupasov hash to sort names REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc5-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/5670 is trying to acquire lock: ffff88807602c460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write_file+0x57/0x190 fs/namespace.c:552 but task is already holding lock: ffff88807b72f090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x6d/0xc0 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}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 __mutex_lock_common+0x1bd/0x26e0 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+0x6d/0xc0 fs/reiserfs/lock.c:27 reiserfs_lookup+0x11b/0x3c0 fs/reiserfs/namei.c:364 __lookup_slow+0x212/0x2f0 fs/namei.c:1685 lookup_one_len+0x4b4/0x4f0 fs/namei.c:2711 reiserfs_lookup_privroot+0x81/0x1d0 fs/reiserfs/xattr.c:973 reiserfs_fill_super+0x1bd0/0x20d0 fs/reiserfs/super.c:2174 mount_bdev+0x27a/0x370 fs/super.c:1359 legacy_get_tree+0xe4/0x170 fs/fs_context.c:610 vfs_get_tree+0x7b/0x220 fs/super.c:1489 do_new_mount+0x1df/0x930 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x20f/0x2a0 fs/namespace.c:3674 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 (&type->i_mutex_dir_key#8){+.+.}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_write+0x9c/0x270 kernel/locking/rwsem.c:1562 inode_lock include/linux/fs.h:756 [inline] chown_common+0x3a1/0x830 fs/open.c:726 do_fchownat+0x10d/0x1c0 fs/open.c:767 __do_sys_lchown fs/open.c:792 [inline] __se_sys_lchown fs/open.c:790 [inline] __x64_sys_lchown+0x7c/0x90 fs/open.c:790 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 (sb_writers#13){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1814 [inline] sb_start_write+0x47/0x130 include/linux/fs.h:1889 mnt_want_write_file+0x57/0x190 fs/namespace.c:552 reiserfs_ioctl+0x143/0x2b0 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xa7/0xf0 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 other info that might help us debug this: Chain exists of: sb_writers#13 --> &type->i_mutex_dir_key#8 --> &sbi->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->lock); lock(&type->i_mutex_dir_key#8); lock(&sbi->lock); lock(sb_writers#13); *** DEADLOCK *** 1 lock held by syz-executor.0/5670: #0: ffff88807b72f090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x6d/0xc0 fs/reiserfs/lock.c:27 stack backtrace: CPU: 1 PID: 5670 Comm: syz-executor.0 Not tainted 6.2.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x12a/0x1c0 lib/dump_stack.c:106 check_noncircular+0x2cc/0x390 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+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1814 [inline] sb_start_write+0x47/0x130 include/linux/fs.h:1889 mnt_want_write_file+0x57/0x190 fs/namespace.c:552 reiserfs_ioctl+0x143/0x2b0 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xa7/0xf0 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 RIP: 0033:0x7f9483c8a5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f9484e28168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9483dabf80 RCX: 00007f9483c8a5a9 RDX: 0000000000000000 RSI: 0000000040087602 RDI: 0000000000000005 RBP: 00007f9483ce5580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdeaca02df R14: 00007f9484e28300 R15: 0000000000022000