====================================================== WARNING: possible circular locking dependency detected 5.15.152-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/9641 is trying to acquire lock: ffffc9000bd210f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline] ffffc9000bd210f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline] ffffc9000bd210f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_begin_r+0x34e/0x1000 fs/reiserfs/journal.c:3045 but task is already holding lock: ffff88807bfda460 (sb_writers#32){.+.+}-{0:0}, at: mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:421 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_writers#32){.+.+}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1787 [inline] sb_start_write+0x4f/0x1c0 include/linux/fs.h:1857 mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:421 reiserfs_ioctl+0x170/0x340 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 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+0x61/0xcb -> #1 (&sbi->lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 reiserfs_write_lock_nested+0x5b/0xd0 fs/reiserfs/lock.c:78 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:815 [inline] lock_journal fs/reiserfs/journal.c:534 [inline] do_journal_begin_r+0x359/0x1000 fs/reiserfs/journal.c:3045 journal_begin+0x148/0x350 fs/reiserfs/journal.c:3253 reiserfs_remount+0xf6b/0x18e0 fs/reiserfs/super.c:1561 reconfigure_super+0x43a/0x870 fs/super.c:925 do_remount fs/namespace.c:2661 [inline] path_mount+0xceb/0x10a0 fs/namespace.c:3327 do_mount fs/namespace.c:3348 [inline] __do_sys_mount fs/namespace.c:3556 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533 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+0x61/0xcb -> #0 (&journal->j_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline] lock_journal fs/reiserfs/journal.c:534 [inline] do_journal_begin_r+0x34e/0x1000 fs/reiserfs/journal.c:3045 journal_begin+0x148/0x350 fs/reiserfs/journal.c:3253 reiserfs_dirty_inode+0x11c/0x240 fs/reiserfs/super.c:710 __mark_inode_dirty+0x2fd/0xd60 fs/fs-writeback.c:2464 mark_inode_dirty include/linux/fs.h:2438 [inline] reiserfs_ioctl+0x29e/0x340 fs/reiserfs/ioctl.c:111 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 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+0x61/0xcb other info that might help us debug this: Chain exists of: &journal->j_mutex --> &sbi->lock --> sb_writers#32 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#32); lock(&sbi->lock); lock(sb_writers#32); lock(&journal->j_mutex); *** DEADLOCK *** 1 lock held by syz-executor.0/9641: #0: ffff88807bfda460 (sb_writers#32){.+.+}-{0:0}, at: mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:421 stack backtrace: CPU: 0 PID: 9641 Comm: syz-executor.0 Not tainted 5.15.152-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline] lock_journal fs/reiserfs/journal.c:534 [inline] do_journal_begin_r+0x34e/0x1000 fs/reiserfs/journal.c:3045 journal_begin+0x148/0x350 fs/reiserfs/journal.c:3253 reiserfs_dirty_inode+0x11c/0x240 fs/reiserfs/super.c:710 __mark_inode_dirty+0x2fd/0xd60 fs/fs-writeback.c:2464 mark_inode_dirty include/linux/fs.h:2438 [inline] reiserfs_ioctl+0x29e/0x340 fs/reiserfs/ioctl.c:111 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 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+0x61/0xcb RIP: 0033:0x7f974cdfada9 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:00007f974b37b0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f974cf28f80 RCX: 00007f974cdfada9 RDX: 0000000020000040 RSI: 0000000040087602 RDI: 0000000000000003 RBP: 00007f974ce4747a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f974cf28f80 R15: 00007fffc157f728