linux-kernel - Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series..)

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Date:	Wed, 3 Oct 2007 11:12:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	Alexander Viro <viro@....linux.org.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [bug] crash when reading /proc/mounts (was: Re: Linux
	2.6.23-rc9 and a heads-up for the 2.6.24 series..)


* Ingo Molnar <mingo@...e.hu> wrote:

>  nodev /debug debugfs rw 0 0
>  ) = 290
>  read(3, "", 4096)                       = 0
>  close(3)                                = 0
> 
> there's nothing particularly interesting in it. (perhaps debugfs)

disabling debugfs makes the crash go away so it's debugfs related. The 
.config delta is below.

	Ingo

--- .config.broken.000	2007-10-03 10:28:14.000000000 +0200
+++ .config.good.000	2007-10-03 11:11:18.000000000 +0200
@@ -85,7 +85,7 @@ CONFIG_MODULE_SRCVERSION_ALL=y
 # CONFIG_KMOD is not set
 CONFIG_BLOCK=y
 # CONFIG_LBD is not set
-CONFIG_BLK_DEV_IO_TRACE=y
+# CONFIG_BLK_DEV_IO_TRACE is not set
 CONFIG_LSF=y
 CONFIG_BLK_DEV_BSG=y
 
@@ -631,7 +631,6 @@ CONFIG_CFG80211=y
 CONFIG_WIRELESS_EXT=y
 CONFIG_MAC80211=y
 CONFIG_MAC80211_LEDS=y
-CONFIG_MAC80211_DEBUGFS=y
 # CONFIG_MAC80211_DEBUG is not set
 CONFIG_IEEE80211=m
 CONFIG_IEEE80211_DEBUG=y
@@ -1689,7 +1688,7 @@ CONFIG_TRACE_IRQFLAGS_SUPPORT=y
 CONFIG_ENABLE_MUST_CHECK=y
 # CONFIG_MAGIC_SYSRQ is not set
 CONFIG_UNUSED_SYMBOLS=y
-CONFIG_DEBUG_FS=y
+# CONFIG_DEBUG_FS is not set
 # CONFIG_HEADERS_CHECK is not set
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_SHIRQ=y
@@ -1724,8 +1724,6 @@ CONFIG_FAULT_INJECTION=y
 # CONFIG_FAILSLAB is not set
 CONFIG_FAIL_PAGE_ALLOC=y
 CONFIG_FAIL_MAKE_REQUEST=y
-CONFIG_FAULT_INJECTION_DEBUG_FS=y
-CONFIG_FAULT_INJECTION_STACKTRACE_FILTER=y
 CONFIG_EARLY_PRINTK=y
 CONFIG_DEBUG_STACKOVERFLOW=y
 # CONFIG_DEBUG_STACK_USAGE is not set
-
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