Re: something really screwed up with mmap+ffs on 5.0_STABLE

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Tue, Aug 17, 2010 at 11:52:31PM +0300, Antti Kantee wrote:
> On Tue Aug 17 2010 at 19:06:38 +0300, Antti Kantee wrote:
> It would be great if someone could confirm or debunk this on -current
> and for archs beyond i386.  Just get the latest sources, go to
> sys/rump/net/lib/libshmif, comment out line 61 (the one with PREFAULT_RW)
> from if_shmif.c, "make && make install", and run tests/net/icmp/t_ping
> floodping in a loop.  You should see a coredump within a few thousand
> iteratios (few minutes) if the problem is there.

Sure enough:

826:arp info overwritten for 1.1.1.10 by b2:a0:61:b4:bc:6f
panic: kernel diagnostic assertion "busmem->shm_magic == SHMIF_MAGIC" failed: fi
le "/sys/rump/net/lib/libshmif/if_shmem.c", line 285
Abort trap (core dumped)
while ( 1 )
827:panic: kernel diagnostic assertion "sp.sp_len < BUSMEM_DATASIZE" failed: fil
e "/usr/src/sys/rump/net/lib/libshmif/shmif_busops.c", line 135
Abort trap (core dumped)
while ( 1 )
828:panic: kernel diagnostic assertion "busmem->shm_magic == SHMIF_MAGIC" failed
: file "/sys/rump/net/lib/libshmif/if_shmem.c", line 388

though again on i386.

Cheers,

Patrick