Date: Tue, 30 Mar 2021 08:37:22 +0200 From: Juraj Lutter <otis@FreeBSD.org> To: dickey@his.com Cc: Henric Jungheim <software@henric.org>, FreeBSD-current@freebsd.org Subject: Re: 13.0-RC3 bison causes tputs SIGSEGV Message-ID: <33EE2402-4447-4168-AB5B-D98009CD03AA@FreeBSD.org> In-Reply-To: <20210329233138.GA4334@prl-debianold-64.jexium-island.net> References: <YGImt%2BhzWnQTUjz/@mail.henric.info> <20210329233138.GA4334@prl-debianold-64.jexium-island.net>
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Hi,
very similar behavior is observed in editors/poke, on recent 13.0-STABLE (stable/13-85ad493677a2):
(lldb) bt
* thread #1, name = 'poke', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
* frame #0: 0x0000000000000000
frame #1: 0x00000008009ed30a libncursesw.so.9`delay_output_sp(sp=0x0000000000000000, ms=<unavailable>) at lib_tputs.c:104:6
frame #2: 0x00000008009edb81 libncursesw.so.9`tputs_sp [inlined] delay_output(ms=<unavailable>) at lib_tputs.c:116:12
frame #3: 0x00000008009edb72 libncursesw.so.9`tputs_sp(sp=<unavailable>, string="", affcnt=1, outc=<unavailable>) at lib_tputs.c:422
frame #4: 0x00000008009edcfb libncursesw.so.9`tputs(string="4f0fdc740005bebaf92e5a2e00000000", affcnt=1, outc=(libtextstyle.so.0`out_char at term-ostream.oo.c:1198)) at lib_tputs.c:444:12
frame #5: 0x0000000800424bb0 libtextstyle.so.0`out_hyperlink_change(stream=0x0000000800e3d000, new_hyperlink=0x00000008018bd600, async_safe=false) at term-ostream.oo.c:1586:7
frame #6: 0x000000080042579c libtextstyle.so.0`out_attr_change(stream=0x0000000800e3d000, new_attr=attributes_t @ 0x00007fffffffe608) at term-ostream.oo.c:1737:11
frame #7: 0x0000000800424f3b libtextstyle.so.0`output_buffer(stream=0x0000000800e3d000, goal_attr=attributes_t @ 0x00007fffffffe690) at term-ostream.oo.c:1906:11
frame #8: 0x00000008004223b2 libtextstyle.so.0`term_ostream__write_mem(stream=0x0000000800e3d000, data=0x0000000000207a94, len=123) at term-ostream.oo.c:2037:11
frame #9: 0x0000000800422ed5 libtextstyle.so.0`term_ostream_write_mem(first_arg=0x0000000800e3d000, data=0x0000000000207a94, len=123) at term-ostream.c:2721:3
frame #10: 0x0000000800427e3f libtextstyle.so.0`term_styled_ostream__write_mem(stream=0x0000000800e3a000, data=0x0000000000207a94, len=123) at term-styled-ostream.oo.c:95:3
frame #11: 0x0000000800420535 libtextstyle.so.0`ostream_write_mem(first_arg=0x0000000800e3a000, data=0x0000000000207a94, len=123) at ostream.c:138:3
frame #12: 0x00000008004204ec libtextstyle.so.0`ostream_write_str(stream=0x0000000800e3a000, string=".\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n") at ostream.oo.c:35:3
frame #13: 0x0000000000210add poke`pk_puts(str=".\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n") at pk-term.c:257:3
Iny my case, there is a NULL pointer dereference in delay_output_ch(), where my_outch is NULL:
frame #0: 0x00000008009ed2da libncursesw.so.9`delay_output_sp(sp=0x0000000000000000, ms=4) at lib_tputs.c:103:22
100 register int nullcount;
101
102 nullcount = (ms * _nc_baudrate(ospeed)) / (BAUDBYTE * 1000);
-> 103 for (_nc_nulls_sent += nullcount; nullcount > 0; nullcount--)
104 my_outch(NCURSES_SP_ARGx PC);
105 if (my_outch == NCURSES_SP_NAME(_nc_outch))
106 NCURSES_SP_NAME(_nc_flush) (NCURSES_SP_ARG);
Application is using term_styled_ostream_create() that does not initialize default_attr.
> On 30 Mar 2021, at 01:31, Thomas Dickey <dickey@his.com> wrote:
>
> On Mon, Mar 29, 2021 at 12:12:55PM -0700, Henric Jungheim wrote:
>>
>> I ran into a bit of an odd problem when building the
>> sysutils/grub2-bhyve port on 13.0-RC3 (on x64). The bison command
>> dumps core when the output is going to a console. Redirecting the
>> build output to a file avoids the problem. I'm not sure if this is
>> an ncurses issue, a port issue (and which port?), my box, or
>> something else (clang?).
>
> It might be a problem with the application's initialization of ncurses.
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