syzbot

REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.2.0-rc1-syzkaller-00084-gc8451c141e07 #0 Not tainted
------------------------------------------------------
syz-executor547/5496 is trying to acquire lock:
ffff888028f92090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x77/0xd0 fs/reiserfs/lock.c:27

but task is already holding lock:
ffff888028373e98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
ffff888028373e98 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x14d/0x2b0 mm/util.c:518

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
       __might_fault+0xb2/0x110 mm/memory.c:5647
       reiserfs_ioctl+0x11c/0x340 fs/reiserfs/ioctl.c:96
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl+0xfb/0x170 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

-> #0 (&sbi->lock){+.+.}-{3:3}:
       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
       __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+0x77/0xd0 fs/reiserfs/lock.c:27
       reiserfs_dirty_inode+0xdf/0x230 fs/reiserfs/super.c:704
       __mark_inode_dirty+0x1e7/0x600 fs/fs-writeback.c:2419
       generic_update_time fs/inode.c:1859 [inline]
       inode_update_time fs/inode.c:1872 [inline]
       touch_atime+0x3d3/0x630 fs/inode.c:1944
       file_accessed include/linux/fs.h:2516 [inline]
       generic_file_mmap+0xbb/0x120 mm/filemap.c:3473
       call_mmap include/linux/fs.h:2191 [inline]
       mmap_region+0xfe6/0x1e20 mm/mmap.c:2621
       do_mmap+0x8d9/0xf30 mm/mmap.c:1411
       vm_mmap_pgoff+0x19e/0x2b0 mm/util.c:520
       ksys_mmap_pgoff+0x48c/0x6d0 mm/mmap.c:1457
       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:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&mm->mmap_lock);
                               lock(&sbi->lock);
                               lock(&mm->mmap_lock);
  lock(&sbi->lock);

 *** DEADLOCK ***

2 locks held by syz-executor547/5496:
 #0: ffff888028373e98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
 #0: ffff888028373e98 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x14d/0x2b0 mm/util.c:518
 #1: ffff8880790d0460 (sb_writers#9){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2516 [inline]
 #1: ffff8880790d0460 (sb_writers#9){.+.+}-{0:0}, at: generic_file_mmap+0xbb/0x120 mm/filemap.c:3473

stack backtrace:
CPU: 0 PID: 5496 Comm: syz-executor547 Not tainted 6.2.0-rc1-syzkaller-00084-gc8451c141e07 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x290 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
 __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+0x77/0xd0 fs/reiserfs/lock.c:27
 reiserfs_dirty_inode+0xdf/0x230 fs/reiserfs/super.c:704
 __mark_inode_dirty+0x1e7/0x600 fs/fs-writeback.c:2419
 generic_update_time fs/inode.c:1859 [inline]
 inode_update_time fs/inode.c:1872 [inline]
 touch_atime+0x3d3/0x630 fs/inode.c:1944
 file_accessed include/linux/fs.h:2516 [inline]
 generic_file_mmap+0xbb/0x120 mm/filemap.c:3473
 call_mmap include/linux/fs.h:2191 [inline]
 mmap_region+0xfe6/0x1e20 mm/mmap.c:2621
 do_mmap+0x8d9/0xf30 mm/mmap.c:1411
 vm_mmap_pgoff+0x19e/0x2b0 mm/util.c:520
 ksys_mmap_pgoff+0x48c/0x6d0 mm/mmap.c:1457
 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: 0033:0x7f18a9e0cd19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18a9db81f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f18a9e927a8 RCX: 00007f18a9e0cd19
RDX: 0000000000000001 RSI: 0000000000400000 RDI: 0000000020000000
RBP: 00007f18a9e927a0 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000010012 R11: 0000000000000246 R12: 00007f18a9e927ac
R13: 00007ffc98f95b0f R14: 00007f18a9db8300 R15: 0000000000022000
 </TASK>