[stgt] help tgt segfault

[Tomasz Chmielewski]

FUJITA Tomonori schrieb:

> TMF (an initiator tries to abort a request due to timeout) might be
> related with your problem. I'll dig into it this weekend.

Here is how you can reproduce it reliably. You need to have LVM on your target.

On the initiator, do:

  dd if=/dev/iscsi/disk of=/dev/null


On the target, do:

  dmsetup suspend /dev/mapper/logical-volume

This will block any I/O to userspace accessing that logical volume.


Wait until you see in logs:

Dec 16 13:54:51 megathecus tgtd: abort_task_set(988) found 60000a07 0
Dec 16 13:54:52 megathecus tgtd: conn_close(88) connection closed 0x807dc5c 4
Dec 16 13:54:55 megathecus tgtd: conn_close(88) connection closed 0x807dc5c 3
Dec 16 13:55:13 megathecus tgtd: conn_close(88) connection closed 0x807dc5c 2
Dec 16 13:55:31 megathecus tgtd: conn_close(88) connection closed 0x807dc5c 1


Then, make the volume accessible again:

  dmsetup resume /dev/mapper/megathecus-backup2


Which will result in:

Dec 16 13:55:32 megathecus kernel: tgtd[4872]: segfault at 00000220 eip 0804f0b5 esp 77c43ff0 error 4


-- 
Tomasz Chmielewski
http://wpkg.org
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