memleak in libfs report

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Hello Chuck,

We have been getting memleaks in offset_ctx->xa in our networking tests:

unreferenced object 0xffff8881004cd080 (size 576):
  comm "systemd", pid 1, jiffies 4294893373 (age 1992.864s)
  hex dump (first 32 bytes):
    00 00 06 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    38 5c 7c 02 81 88 ff ff 98 d0 4c 00 81 88 ff ff  8\|.......L.....
  backtrace:
    [<000000000f554608>] xas_alloc+0x306/0x430
    [<0000000075537d52>] xas_create+0x4b4/0xc80
    [<00000000a927aab2>] xas_store+0x73/0x1680
    [<0000000020a61203>] __xa_alloc+0x1d8/0x2d0
    [<00000000ae300af2>] __xa_alloc_cyclic+0xf1/0x310
    [<000000001032332c>] simple_offset_add+0xd8/0x170
    [<0000000073229fad>] shmem_mknod+0xbf/0x180
    [<00000000242520ce>] vfs_mknod+0x3b0/0x5c0
    [<000000001ef218dd>] unix_bind+0x2c2/0xdb0
    [<0000000009b9a8dd>] __sys_bind+0x127/0x1e0
    [<000000003c949fbb>] __x64_sys_bind+0x6e/0xb0
    [<00000000b8a767c7>] do_syscall_64+0x3d/0x90
    [<000000006132ae0d>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

It looks like those may be caused by recent commit 6faddda69f62 ("libfs:
Add directory operations for stable offsets") but we don't have a proper
reproduction, just sometimes arbitrary getting the memleak complains
during/after the regression run.

Regards,
Vlad




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