Date: Thu, 5 Nov 2020 17:01:14 -0800 From: Pete Wright <pete@nomadlogic.org> To: Patrick Mahan <plmahan@gmail.com> Cc: questions list <freebsd-questions@freebsd.org> Subject: Re: Helping understand cause of SIGSEGV Message-ID: <0764e7ef-bd81-a6c5-47c4-7cd539a428f5@nomadlogic.org> In-Reply-To: <CAFDHx1Jg_9k3oWU8X-WdP2CJX8hnBYgMz%2BvxwOs766JZcM3WRQ@mail.gmail.com> References: <c2eab4b0-b10b-9db3-1aa3-1f61689e24e8@nomadlogic.org> <CAFDHx1Jg_9k3oWU8X-WdP2CJX8hnBYgMz%2BvxwOs766JZcM3WRQ@mail.gmail.com>
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On 11/5/20 4:01 PM, Patrick Mahan wrote: > > > | thread #1, name = 'fluent-bit', stop reason = signal SIGABRT > * frame #0: 0x000000004087100a libc.so.7`__sys_thr_kill at > thr_kill.S:4 > frame #1: 0x00000000407e6c84 libc.so.7`__raise(s=6) at > raise.c:52:10 > frame #2: 0x000000004089a5d9 libc.so.7`abort at abort.c:67:8 > frame #3: 0x000000000034a7a8 > fluent-bit`flb_signal_handler(signal=11) at fluent-bit.c:418:9 > frame #4: 0x00000000406d1c20 > libthr.so.3`handle_signal(actp=0x00007fffdfffc600, sig=11, > info=0x00007fffdfffc9f0, ucp=0x00007fffdfffc680) at thr_sig.c:303:3 > frame #5: 0x00000000406d11ef libthr.so.3`thr_sighandler(sig=11, > info=0x00007fffdfffc9f0, _ucp=0x00007fffdfffc680) at thr_sig.c:246:2 > frame #6: 0x00007fffffffe193 > frame #7: 0x000000000036fe0c fluent-bit`tasks_start [inlined] > output_params_set(th=0x00000000416091c0, data=0x000000004165d980, > bytes=128, tag="random.0", tag_len=8, i_ins=0x0000000040e58000, > out_plugin=0x0000000040e2dfc0, out_context=0x00000000416051e0, > config=0x0000000040e19180) at flb_output.h:429:5 > > > I would look at what is happening here in output_params_set(). Something > is accessing out of bounds memory. thanks for your response Patrick i really appreciate it. So here is where output_params_set() is defined - with an interesting comment that i haven't chased down yet: 521 /* Workaround for makecontext() */ 522 output_params_set(th, 523 buf, 524 size, 525 tag, 526 tag_len, 527 i_ins, 528 o_ins->p, 529 o_ins->context, 530 config); 531 return th; 532 } 533 and the frame from the backtrace is this for reference: frame #8: 0x000000000036fd14 fluent-bit`tasks_start [inlined] flb_output_thread(task=0x00000000416410a0, i_ins=0x0000000040e58000, o_ins=0x0000000040e5b000, config=0x0000000040e19180, buf=0x000000004165d980, size=128, tag="random.0", tag_len=8) at flb_output.h:522 and then later on line 429 of flb_output.h it does this: 428 FLB_TLS_SET(flb_libco_params, params); 429 co_switch(th->callee); like i said i'm not really sure how to grok this, but it sounds like one of the params in output_params_set isn't being set correctly. hopefully the code snippet makes the error more obvious :) -pete -- Pete Wright pete@nomadlogic.org @nomadlogicLA
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