Date: Tue, 07 Oct 2008 18:50:09 -0700 From: Tim Kientzle <kientzle@freebsd.org> To: jos@catnook.com Cc: Andrey Chernov <ache@nagual.pp.ru>, freebsd-current@freebsd.org Subject: Re: firefox3-bin crashes near arc4random_buf() Message-ID: <48EC11D1.3090304@freebsd.org> In-Reply-To: <20081007163143.GA25284@lizzy.catnook.local> References: <20081004080511.GA72641@lizzy.catnook.local> <20081004161024.GA67323@nagual.pp.ru> <20081004222249.GA48928@lizzy.catnook.local> <48E80F02.4070309@freebsd.org> <20081005233256.GB8507@lizzy.catnook.local> <48E95D0E.50202@freebsd.org> <20081006051424.GA5858@lizzy.catnook.local> <48EA2FA0.8060007@freebsd.org> <20081006190750.GA14017@lizzy.catnook.local> <48EAE8DA.2000908@freebsd.org> <20081007163143.GA25284@lizzy.catnook.local>
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This is a lot more interesting. This points to a crash within libc's db code. Somehow, it's trying to compute a hash for some element with length -10618, which is getting converted to an unsigned 4294956678, which is causing the crash. Does Firefox have knobs to use a newer Berkeley DB? I can't recall whether newer Berkeley DB versions are thread-safe but I'm pretty sure the old version in our libc isn't. If Firefox is assuming the BDB code is thread-safe that could certainly cause corruption of the BDB data with all sorts of unpleasant consequences. That's just a random guess, though. Maybe someone else on this mailing list knows better. Tim > Good news! firefox3 crashed again, so the problem is not fixed. But the > backtrace (attached) looks slightly different this time. Anything particular > you'd like me to look at? > #0 0x2a31656b in thr_kill () at thr_kill.S:2 > #1 0x2a2c5736 in pthread_kill () from /lib/libthr.so.3 > #2 0x2a2c32c3 in raise () from /lib/libthr.so.3 > #3 0x28237381 in XRE_InitEmbedding () from /usr/local/lib/firefox3/libxul.so > #4 <signal handler called> > #5 hash4 (keyarg=0xad6397a, len=4294956678) at /usr/src/lib/libc/db/hash/hash_func.c:184 > #6 0x2a39ab3d in __call_hash (hashp=0x8386200, k=0xad6397a "", len=-10618) at /usr/src/lib/libc/db/hash/hash.c:896 > #7 0x2a3997fa in __split_page (hashp=0x8386200, obucket=7, nbucket=15) at /usr/src/lib/libc/db/hash/hash_page.c:356 > #8 0x2a39ac09 in __expand_table (hashp=0x8386200) at /usr/src/lib/libc/db/hash/hash.c:865 > #9 0x2a39922f in __addel (hashp=0x8386200, bufp=0xb2e47c0, key=0xbf4f9640, val=0xbf4f9648) at /usr/src/lib/libc/db/hash/hash_page.c:454 > #10 0x2a39c2e0 in hash_access (hashp=0x8386200, action=HASH_PUT, key=0xbf4f9640, val=0xbf4f9648) at /usr/src/lib/libc/db/hash/hash.c:680 > #11 0x2aa0cb9c in ?? () from /usr/local/lib/firefox3/libnssdbm3.so > #12 0xbf4f9648 in ?? () > #13 0xbf4f9640 in ?? () > #14 0xbf4f9648 in ?? () > #15 0x00000000 in ?? () > #16 0x2a2c3599 in pthread_self () from /lib/libthr.so.3 > #17 0x2aa1c3e4 in legacy_SetCryptFunctions () from /usr/local/lib/firefox3/libnssdbm3.so > #18 0x2aa1cbb8 in legacy_SetCryptFunctions () from /usr/local/lib/firefox3/libnssdbm3.so > #19 0x2aa1d6ff in legacy_SetCryptFunctions () from /usr/local/lib/firefox3/libnssdbm3.so > #20 0x2aa218b2 in legacy_SetCryptFunctions () from /usr/local/lib/firefox3/libnssdbm3.so > #21 0x2aa236c9 in legacy_SetCryptFunctions () from /usr/local/lib/firefox3/libnssdbm3.so > #22 0x2aa23791 in legacy_SetCryptFunctions () from /usr/local/lib/firefox3/libnssdbm3.so
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