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From: "Zhangyanfei (YF)" <>
To: "" <>,
	"" <>
Cc: "" <>,
	guijianfeng <>,
	"Zhangyanfei (YF)" <>,
	Fengtiantian <>,
	"" <>
Subject: [linux-lvm] dmsetup hangs forever
Date: Thu, 26 Oct 2017 08:07:01 +0000	[thread overview]
Message-ID: <> (raw)

[-- Attachment #1: Type: text/plain, Size: 792 bytes --]


I find an issue when use  dmsetup in the situation udev event timeout.

Dmsetup use the dm_udev_wait function sync with udev event.When use the dmsetup generate a new dm-disk, if the raw disk is abnormal(for example ,a ipsan disk hung IO request), the udevd daemon handle the dm-disk udev event maybe timeout, and will not notify the dmsetup  by semaphore. And because the  dm_udev_wait use the semop to sync with udevd, if udevd event timeout, the dmsetup will hung forever even when the raw disk be recovery.

I wonder if we could use the semtimedop instead semop to add the timeout in function  dm_udev_wait. If the udevd daemon timeout when handle the dm event, the dm_udev_wait could timeout too, and the dmsetup could return error.

This is my patch base lvm2-2.02.115-3:

             reply	other threads:[~2017-10-26  8:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-26  8:07 Zhangyanfei (YF) [this message]
2017-10-26  8:39 ` [linux-lvm] [dm-devel] dmsetup hangs forever Zdenek Kabelac
2017-10-27  8:00   ` [linux-lvm] 答复: " Zhangyanfei (YF)
2017-10-27 12:28     ` Zdenek Kabelac

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