Re: www/chromium crashing whole system

On Sat, Nov 13, 2010 at 11:59:00AM +0000, Alexander Best wrote:
> On Sat Nov 13 10, Kostik Belousov wrote:
> > On Fri, Nov 12, 2010 at 10:37:15PM +0000, Alexander Best wrote:
> > > hi there,
> > > 
> > > i'm having an issue with www/chromium. sometimes it will completely lock up my
> > > system without producing a core dump. i'm running HEAD (r215102; amd64).
> > Core dump of the kernel or the process ?
> 
> a kernel core dump never gets produced. and this is the first time a process
> dump made it to disk.
> 
> > 
> > You probably should follow the usual procedure for the deadlock
> > debugging, see dev handbook.
> 
> i have all those options in my kernel conf. still the computer just locks up
> without any chance to enter the debugger. nothing works any longer.
Do you use serial or firewire console ? Since you run chromium, you
should run X server, and you cannot use syscons for ddb while in X.

> 
> > 
> > > 
> > > this time however chrome.core made it to disk somehow:
> > > 
> > ...
> > 
> > > Loaded symbols for /libexec/ld-elf.so.1
> > > #0  0x00000008026d76a2 in symlook_default (name=0x806797dbc "__sys_sigreturn", hash=92647454, refobj=0x802722c00, defobj_out=0x7fffffbfe160, ventry=0x802717790, flags=1) at /usr/src/libexec/rtld-elf/rtld.c:2675
> > Please show the output of "info locals" in the frame 0.
> 
> (gdb) frame 0
> #0  0x00000008026d76a2 in symlook_default (name=0x806797dbc "__sys_sigreturn", hash=92647454, refobj=0x802722c00, defobj_out=0x7fffffbfe160, ventry=0x802717790, flags=1) at /usr/src/libexec/rtld-elf/rtld.c:2675
> 2675		symp = symlook_list(name, hash, &list_main, &obj, ventry, flags,
> (gdb) info locals
> donelist = {objs = 0x7fffffbfde90, num_alloc = 64, num_used = 0}
> def = (const Elf_Sym *) 0x0
Right, this is what I suspected. def is NULL, but the code path selected
seems to be the one which happens when def != NULL. This is either a
random memory corruption inside the process, or might be some other
usermode issue. It is very unlikely that it has anything with kernel
deadlock.

> symp = (const Elf_Sym *) 0x7fffffbfe0e0
> obj = Variable "obj" is not available.
> 
> cheers.
> alex
> 
> > 
> > > 2675		symp = symlook_list(name, hash, &list_main, &obj, ventry, flags,
> > > [New Thread 2ee6b40 (LWP 100245)]
> > > [New Thread 2ee6000 (LWP 100212)]
> > > (gdb) bt
> > > #0  0x00000008026d76a2 in symlook_default (name=0x806797dbc "__sys_sigreturn", hash=92647454, refobj=0x802722c00, defobj_out=0x7fffffbfe160, ventry=0x802717790, flags=1) at /usr/src/libexec/rtld-elf/rtld.c:2675
> > > #1  0x00000008026d815c in find_symdef (symnum=217, refobj=0x802722c00, defobj_out=0x7fffffbfe1a8, flags=1, cache=0x0) at /usr/src/libexec/rtld-elf/rtld.c:1205
> > > #2  0x00000008026d8233 in _rtld_bind (obj=0x802722c00, reloff=Variable "reloff" is not available.
> > > ) at /usr/src/libexec/rtld-elf/rtld.c:557
> > > #3  0x00000008026d487d in _rtld_bind_start () at /usr/src/libexec/rtld-elf/amd64/rtld_start.S:99
> > > #4  0xffffffff91969eb2 in ?? ()
> > > #5  0x0000000000000000 in ?? ()
> > > #6  0x0000000000000000 in ?? ()
> > > #7  0xfffffffffffffbd0 in ?? ()
> > > #8  0x00007fffffbfe260 in ?? ()
> > > #9  0x00007fffffbfe260 in ?? ()
> > > #10 0x0000000000000000 in ?? ()
> > > #11 0x0000000002ee6000 in ?? ()
> > > #12 0x0000000002ee6cb8 in ?? ()
> > > #13 0x0000000000000206 in ?? ()
> > > #14 0x0000000000000000 in ?? ()
> > > #15 0x0000000802722c00 in ?? ()
> > > #16 0x0000000000000024 in ?? ()
> > > #17 0x000000080679fc26 in handle_signal (actp=Variable "actp" is not available.
> > > ) at /usr/src/lib/libthr/thread/thr_sig.c:254
> > > #18 0x000000080679fd5f in thr_sighandler (sig=20, info=0x7fffffbfea00, _ucp=0x7fffffbfe690) at /usr/src/lib/libthr/thread/thr_sig.c:181
> > > #19 <signal handler called>
> > > #20 0x00000008069cad6c in read () at read.S:3
> > > #21 0x000000080679dc70 in __read (fd=15, buf=0x7fffffbfef84, nbytes=4) at /usr/src/lib/libthr/thread/thr_syscalls.c:460
> > > #22 0x000000000043871f in (anonymous namespace)::ShutdownDetector::ThreadMain ()
> > > #23 0x0000000000984caa in ThreadFunc ()
> > > #24 0x000000080679b81e in thread_start (curthread=0x2ee6b40) at /usr/src/lib/libthr/thread/thr_create.c:273
> > > #25 0x0000000000000000 in ?? ()
> > > Cannot access memory at address 0x7fffffbff000
> > > 
> > > cheers.
> > > alex
> > > 
> > > -- 
> > > a13x
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> 
> 
> 
> -- 
> a13x