tor crashes with Assertion smartlist_get(rl->old_routers, idx) == sd failed

I started my gateway with stderr redirected to syslog and got following crash:

Sep  2 12:30:07 OpenWrt cron.info crond[708]: crond: USER root pid 1794 cmd /root/tor-watchdog.sh
Sep  2 12:43:19 OpenWrt daemon.err Tor[1280]: routerlist_remove_old(): Bug: routerlist.c:3004: routerlist_remove_old: Assertion idx == sd->routerlist_index failed; aborting.
Sep  2 12:43:21 OpenWrt user.notice tor.stdout: routerlist.c:3004 routerlist_remove_old: Assertion idx == sd->routerlist_index failed; aborting.
Sep  2 12:45:01 OpenWrt cron.info crond[708]: crond: USER root pid 1797 cmd /root/tor-watchdog.sh
Sep  2 12:45:01 OpenWrt user.notice Tor.watchdog: pidfile exists and process is missing - start
Sep  2 12:45:02 OpenWrt user.notice Tor.init: Sep 02 12:45:02.684 [notice] Tor v0.2.2.37 (git-fce6eb1c44e87bc2). This is experimental software. Do not rely on it for strong anonymity. (Running on Linux mips)

OpenWrt package versions: libopenssl - 1.0.1c-1, tor - 0.2.2.37-1

openssl build information:

root@OpenWrt:~# strings /usr/lib/libcrypto.so.1.0.0 | grep gcc
libgcc_s.so.1
mipsel-openwrt-linux-uclibc-gcc -fPIC -DOPENSSL_PIC -DZLIB_SHARED -DZLIB -DDSO_DLFCN -DHAVE_DLFCN_H -I/home/fnord/slave/brcm47xx/build/staging_dir/target-mipsel_uClibc-0.9.33.2/usr/include -I/home/fnord/slave/brcm47xx/build/staging_dir/target-mipsel_uClibc-0.9.33.2/include -I/home/fnord/slave/brcm47xx/build/staging_dir/toolchain-mipsel_gcc-4.6-linaro_uClibc-0.9.33.2/usr/include -I/home/fnord/slave/brcm47xx/build/staging_dir/toolchain-mipsel_gcc-4.6-linaro_uClibc-0.9.33.2/include -DOPENSSL_SMALL_FOOTPRINT -DHAVE_CRYPTODEV -DOPENSSL_NO_ERR -DTERMIO -Os -pipe -mips32 -mtune=mips32 -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -msoft-float -fpic -DOPENSSL_THREADS -pthread -D_REENTRANT -D_THREAD_SAFE -D_THREADSAFE -fomit-frame-pointer -Wall