Your message dated Wed, 13 Jun 2007 11:27:35 +0100 with message-id <[EMAIL PROTECTED]> and subject line Bug#297264: ssh deadlock when LogLevel is DEBUG3 has caused the attached Bug report to be marked as done.
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--- Begin Message ---Package: ssh Version: 1:3.8.1p1-8.sarge.4 Severity: important If I set LogLevel of sshd to DEBUG3, sometimes I get deadlock of child ssh process. Here is backtrace (ssh was rebuilt from 3.8.1p1-8.sarge.4 source with debug information): #0 0x401a1604 in __pthread_sigsuspend () from /lib/libpthread.so.0 #1 0x401a13c8 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #2 0x401a2d99 in __pthread_alt_lock () from /lib/libpthread.so.0 #3 0x4019fba5 in pthread_mutex_lock () from /lib/libpthread.so.0 #4 0x402befcb in openlog () from /lib/libc.so.6 #5 0x080729c8 in do_log (level=SYSLOG_LEVEL_DEBUG1, fmt=0x80849bc "Received SIGCHLD.", args=0xbfffe104 "TZ") at ../log.c:331 #6 0x08072600 in debug (fmt=0x80849bc "Received SIGCHLD.") at ../log.c:163 #7 0x08053240 in sigchld_handler (sig=17) at ../serverloop.c:145 #8 0x401a4825 in __pthread_sighandler () from /lib/libpthread.so.0 #9 <signal handler called> #10 0x402c33f6 in send () from /lib/libc.so.6 #11 0x402beaff in vsyslog () from /lib/libc.so.6 #12 0x402be76f in syslog () from /lib/libc.so.6 #13 0x080729e8 in do_log (level=SYSLOG_LEVEL_DEBUG2, fmt=0x808ef44 "channel %d: output %s -> %s", args=0xbfffeef4 "") at ../log.c:332 #14 0x08072628 in debug2 (fmt=0x808ef44 "channel %d: output %s -> %s") at ../log.c:173 #15 0x08073281 in chan_set_ostate (c=0x809b3e0, next=3) at ../nchan.c:95 #16 0x0807362e in chan_obuf_empty (c=0x809b3e0) at ../nchan.c:221 #17 0x08073a92 in chan_rcvd_ieof (c=0x809b3e0) at ../nchan.c:372 #18 0x0806e726 in channel_input_ieof (type=96, seq=10, ctxt=0x812c690) at ../channels.c:1914 #19 0x0807b3a0 in dispatch_run (mode=1, done=0x0, ctxt=0x812c690) at ../dispatch.c:93 #20 0x08053bc4 in process_buffered_input_packets () at ../serverloop.c:475 #21 0x0805436e in server_loop2 (authctxt=0x809ab10) at ../serverloop.c:759 #22 0x0805b875 in do_authenticated2 (authctxt=0x809ab10) at ../session.c:2212 #23 0x08057fd1 in do_authenticated (authctxt=0x809ab10) at ../session.c:226 #24 0x0804ef64 in main (ac=1, av=0x8098750) at ../sshd.c:1513 I've found following remark that I think is related to my problem: http://rpmfind.net/linux/RPM/suse/updates/9.1/i386/rpm/i586/openssh-3.8p1-37.17.i586.html * Mon Jun 28 2004 - [EMAIL PROTECTED] - block sigalarm during syslog output or we might deadlock on recursively entering syslog(). (LTC#9523, SUSE#42354) Regards, Alexandra. -- System Information: Debian Release: 3.1 APT prefers testing APT policy: (999, 'testing'), (50, 'unstable') Architecture: i386 (i686) Kernel: Linux 2.4.27-2-686-smp Locale: LANG=C, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8) Versions of packages ssh depends on: ii adduser 3.59 Add and remove users and groups ii debconf 1.4.30.11 Debian configuration management sy ii dpkg 1.10.26 Package maintenance system for Deb ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an ii libpam-modules 0.76-22 Pluggable Authentication Modules f ii libpam-runtime 0.76-22 Runtime support for the PAM librar ii libpam0g 0.76-22 Pluggable Authentication Modules l ii libssl0.9.7 0.9.7e-2 SSL shared libraries ii libwrap0 7.6.dbs-6 Wietse Venema's TCP wrappers libra ii zlib1g 1:1.2.2-3 compression library - runtime -- debconf information excluded
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--- Begin Message ---Source: openssh Source-Version: 1:4.6p1-1 On Mon, Feb 28, 2005 at 01:50:19PM +0300, Alexandra N. Kossovsky wrote: > Package: ssh > Version: 1:3.8.1p1-8.sarge.4 > Severity: important > > > If I set LogLevel of sshd to DEBUG3, sometimes I get deadlock of child ssh > process. > Here is backtrace (ssh was rebuilt from 3.8.1p1-8.sarge.4 source with debug > information): > > #0 0x401a1604 in __pthread_sigsuspend () from /lib/libpthread.so.0 > #1 0x401a13c8 in __pthread_wait_for_restart_signal () from > /lib/libpthread.so.0 > #2 0x401a2d99 in __pthread_alt_lock () from /lib/libpthread.so.0 > #3 0x4019fba5 in pthread_mutex_lock () from /lib/libpthread.so.0 > #4 0x402befcb in openlog () from /lib/libc.so.6 > #5 0x080729c8 in do_log (level=SYSLOG_LEVEL_DEBUG1, > fmt=0x80849bc "Received SIGCHLD.", args=0xbfffe104 "TZ") at ../log.c:331 > #6 0x08072600 in debug (fmt=0x80849bc "Received SIGCHLD.") at ../log.c:163 > #7 0x08053240 in sigchld_handler (sig=17) at ../serverloop.c:145 This was fixed in OpenSSH 4.4. The upstream changelog entry was: - [EMAIL PROTECTED] 2006/03/04 04:12:58 [serverloop.c] move a debug() outside of a signal handler; ok markus@ a little while back Thanks, -- Colin Watson [EMAIL PROTECTED]
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