REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.472/5588 is trying to acquire lock: ffff88807cce7090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27 but task is already holding lock: ffff888079bc2460 (sb_writers#18){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2600 [inline] ffff888079bc2460 (sb_writers#18){.+.+}-{0:0}, at: iterate_dir+0x47c/0x560 fs/readdir.c:70 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_writers#18){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1891 [inline] sb_start_write+0x4d/0x1c0 include/linux/fs.h:1966 mnt_want_write_file+0x5c/0x200 fs/namespace.c:446 reiserfs_ioctl+0x10a/0x330 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sbi->lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0x10d/0x260 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2eb/0xe90 fs/fs-writeback.c:2449 generic_update_time fs/inode.c:1946 [inline] inode_update_time fs/inode.c:1959 [inline] touch_atime+0x3b6/0x640 fs/inode.c:2031 file_accessed include/linux/fs.h:2600 [inline] iterate_dir+0x47c/0x560 fs/readdir.c:70 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xf2/0x270 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#18); lock(&sbi->lock); lock(sb_writers#18); lock(&sbi->lock); *** DEADLOCK *** 3 locks held by syz.4.472/5588: #0: ffff8880243779e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ae/0x360 fs/file.c:1038 #1: ffff8880709702e0 (&type->i_mutex_dir_key#13){++++}-{3:3}, at: iterate_dir+0x10d/0x560 fs/readdir.c:55 #2: ffff888079bc2460 (sb_writers#18){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2600 [inline] #2: ffff888079bc2460 (sb_writers#18){.+.+}-{0:0}, at: iterate_dir+0x47c/0x560 fs/readdir.c:70 stack backtrace: CPU: 1 PID: 5588 Comm: syz.4.472 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0x10d/0x260 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2eb/0xe90 fs/fs-writeback.c:2449 generic_update_time fs/inode.c:1946 [inline] inode_update_time fs/inode.c:1959 [inline] touch_atime+0x3b6/0x640 fs/inode.c:2031 file_accessed include/linux/fs.h:2600 [inline] iterate_dir+0x47c/0x560 fs/readdir.c:70 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xf2/0x270 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7d4c19c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7d4d147028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f7d4c415fa0 RCX: 00007f7d4c19c819 RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f7d4c232c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7d4c416038 R14: 00007f7d4c415fa0 R15: 00007ffcc7de6628 REISERFS warning (device loop4): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 4) not found (pos 2)