[Bug 208805] New: XFS: iozone possible memory allocation deadlock

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=208805

            Bug ID: 208805
           Summary: XFS: iozone possible memory allocation deadlock
           Product: File System
           Version: 2.5
    Kernel Version: Linux 5.4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: XFS
          Assignee: filesystem_xfs@kernel-bugs.kernel.org
          Reporter: jjzuming@outlook.com
        Regression: No

When I ran iozone to test XFS in a memory insufficient situation，I found that
iozone was blocked and The log "XFS: iozone possible memory allocation
deadlock" was printed.

Reviewing the XFS code, I found that kmem_alloc(), xfs_buf_allocate_memory(),
kmem_zone_alloc() and kmem_realloc() were implemented with "while" loops. These
functions kept trying to get memory while the memory was insufficient, as a
result of which "memory allocation deadlock" happened.

I think it may be a little unreasonable, although it can guarantee that the
memory allocation succeed. Maybe using error handling code to handle the memory
allocation failures is better.

-- 
You are receiving this mail because:
You are watching the assignee of the bug.