Re: firefox + flash exit -> ddb

[Thomas Klausner <tk%giga.or.at@localhost>]

On Thu, Dec 08, 2011 at 07:51:34AM -0800, Chuck Silvers wrote:
> I saw this problem pretty regularly earlier this year, but I haven't seen it
> in the last two months or so.  if someone could send me a crash dump from
> one of these crashes, that would be great.  I never managed to get a dump
> back when it was happening to me.

I've just reproduced this bug with my 5.99.58 kernel.
It doesn't happen everytime, but when firefox runs for a longer time,
the chances are pretty good. Visiting a flash site is not a guarantee for
the bug.

Sadly, when I "reboot 0x104"ed, I got a recursive panic.

Here's the backtrace of the original panic:
panic: kernel diagnostic assertion "anon != NULL && anon->an_ref !=
failed: file "/archive/cvs/src/sys/uvm/uvm_amap.c", line 718
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ... cs 8 rflags 246 cr2 ... cpl
rsp ...
Stopped in pid 765.5103 (xulrunner-bin) at netbsd:breakpoint+0x5: leave
breakpint
vpanic
kern_assert
awap_wipeout
uvm_unmap_detach
uvmspace_free
exit1
sigexit
postsig
lwp_userret
syscall

The next panic looked like this:
vpanic
printf_nolog
ata_get_xfer
ahci_ata_bio
wddump
dkdump
dump_header_flush
dodumpsys
dumpsys
db_fncall
db_command
db_command_loop
db_trap
kdb_trap
uvm_fault -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ... cs 8 rflags 10246 cr2 b8 cpl 8 rsp ...
kernel: page fault trap, code = 0
Faulted in DDB, continuing...
breakpoint
vpanic
printf_nolog
ata_get_xfer
...

Does this tell you anything?
 Thomas