Date: Wed, 02 Dec 2015 13:53:44 -0800 From: John Baldwin <jhb@freebsd.org> To: Don Lewis <truckman@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: panic: sbuf_vprintf called with a NULL sbuf pointer Message-ID: <483094235.OWQWKtkdYD@ralph.baldwin.cx> In-Reply-To: <201512022126.tB2LPuHA021478@gw.catspoiler.org> References: <201512022126.tB2LPuHA021478@gw.catspoiler.org>
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On Wednesday, December 02, 2015 01:25:56 PM Don Lewis wrote: > > If you want to look at this further, try going to frame 16 and dissassembling the > > instructions before the call to see if you can spot which register the first > > parameter (saved in %rdi IIRC) comes from. > > Dump of assembler code for function sbuf_printf: > 0xffffffff80a673e0 <+0>: push %rbp > 0xffffffff80a673e1 <+1>: mov %rsp,%rbp > 0xffffffff80a673e4 <+4>: push %r14 > 0xffffffff80a673e6 <+6>: push %rbx > 0xffffffff80a673e7 <+7>: sub $0x50,%rsp > 0xffffffff80a673eb <+11>: mov %rsi,%r14 > 0xffffffff80a673ee <+14>: mov %rdi,%rbx > 0xffffffff80a673f1 <+17>: mov %r9,-0x38(%rbp) > 0xffffffff80a673f5 <+21>: mov %r8,-0x40(%rbp) > 0xffffffff80a673f9 <+25>: mov %rcx,-0x48(%rbp) > 0xffffffff80a673fd <+29>: mov %rdx,-0x50(%rbp) > 0xffffffff80a67401 <+33>: lea -0x60(%rbp),%rax > 0xffffffff80a67405 <+37>: mov %rax,-0x20(%rbp) > 0xffffffff80a67409 <+41>: lea 0x10(%rbp),%rax > 0xffffffff80a6740d <+45>: mov %rax,-0x28(%rbp) > 0xffffffff80a67411 <+49>: movl $0x30,-0x2c(%rbp) > 0xffffffff80a67418 <+56>: movl $0x10,-0x30(%rbp) > 0xffffffff80a6741f <+63>: mov $0xffffffff8137bdf8,%rdi > 0xffffffff80a67426 <+70>: mov %rbx,%rsi > 0xffffffff80a67429 <+73>: callq 0xffffffff80a66c00 <_assert_sbuf_integrity> > > > 0xffffffff80a237b9 <+825>: jmpq 0xffffffff80a236fd <sigexit+637> > 0xffffffff80a237be <+830>: mov $0xffffffff80fd8ad3,%rsi > 0xffffffff80a237c5 <+837>: xor %eax,%eax > 0xffffffff80a237c7 <+839>: mov %r12,%rdi > 0xffffffff80a237ca <+842>: mov -0x228(%rbp),%rdx > 0xffffffff80a237d1 <+849>: callq 0xffffffff80a673e0 <sbuf_printf> > => 0xffffffff80a237d6 <+854>: inc %r14d > 0xffffffff80a237d9 <+857>: jmpq 0xffffffff80a236fd <sigexit+637> So maybe try 'p $r12' in the corefile_open() frame. -- John Baldwin
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