Date: Wed, 18 Jan 2006 18:12:02 -0800 From: Jason Evans <jasone@freebsd.org> To: SANETO Takanori <sanewo@ba2.so-net.ne.jp> Cc: freebsd@newmillennium.net.au, freebsd-current@FreeBSD.org, robin@isometry.net Subject: Re: Malloc bugs exhibited in ports/mail/dovecot Message-ID: <6A234191-C4DA-4E1B-BB4D-1F3F8043DDA9@freebsd.org> In-Reply-To: <43CECA2C.6030400@ba2.so-net.ne.jp> References: <200601161150.k0GBoamk010563@locutus.newmillennium.net.au> <91B40C65-A11B-427E-B352-8B6EF8A55864@freebsd.org> <43CECA2C.6030400@ba2.so-net.ne.jp>
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On Jan 18, 2006, at 3:07 PM, SANETO Takanori wrote:
> I experienced this using malloc.c 1.95.
> assert("arenas != NULL") failed in malloc.c:4519.
>
> To reproduce, build mail/dovecot (under either version of malloc.c)
> and
> run it under libc of malloc.c rev 1.95. imap-login and pop3-login
> dump core.
>
> My environment is:
> FreeBSD 7-CURRENT as of 2006/01/15 (+latest libc including malloc.c
> 1.95)
> in VMware 4.5.3
> sysctl hw.ncpu = 1
>
> % ldd /usr/local/libexec/dovecot/imap-login
> /usr/local/libexec/dovecot/imap-login:
> libssl.so.4 => /usr/lib/libssl.so.4 (0x2809b000)
> libcrypto.so.4 => /lib/libcrypto.so.4 (0x280cc000)
> libc.so.6 => /lib/libc.so.6 (0x281d2000)
This is due to:
1) A bug in malloc. If malloc() fails the first time it is called,
this causes a fatal error rather than returning NULL. This is fixed
in revision 1.96 of malloc.c.
2) Low resource limits set by dovecot. malloc extends the heap in
increments of 16 MB, and dovecot's resource limits are set low enough
that malloc immediately fails. The attached patch to the dovecot
port works around this. Another reasonable workaround would be to
define _malloc_options to be "k" (or "kk", or ...) in the dovecot
source code. A short term (but not generally recommended, since it
affects all programs) workaround would be to set /etc/malloc.conf to
'k'.
Thanks,
Jason
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Index: files/patch-aa
===================================================================
RCS file: files/patch-aa
diff -N files/patch-aa
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ files/patch-aa 19 Jan 2006 01:38:02 -0000
@@ -0,0 +1,11 @@
+--- src/master/master-settings.c Tue Dec 6 04:54:30 2005
++++ ../../work.old/dovecot-1.0.alpha5/src/master/master-settings.c Wed Jan 18 17:33:54 2006
+@@ -271,7 +271,7 @@
+ MEMBER(login_chroot) TRUE,
+ MEMBER(login_greeting_capability) FALSE,
+
+- MEMBER(login_process_size) 32,
++ MEMBER(login_process_size) 64,
+ MEMBER(login_processes_count) 3,
+ MEMBER(login_max_processes_count) 128,
+ MEMBER(login_max_logging_users) 256,
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