Re: kern/47041 (amd64 kernel core dumps are broken)

[Taylor R Campbell <campbell+netbsd%mumble.net@localhost>]

Similar issue again, triggered by `sysctl -w kern.panic_now=1' while
the machine was idle.  My wild guess is that this smells faintly like
an ahcisata MP-safety issue.

Skipping crash dump on recursive panic
panic: pool_get(ataspl): free list modified: magic=deaddeed; page 
0xfffffe8874831000; item addr 0xfffffe8874831f00

cpu18: Begin traceback...
printf_nolog() at netbsd:printf_nolog
pool_cache_cpu_init1() at netbsd:pool_cache_cpu_init1
ata_get_xfer() at netbsd:ata_get_xfer+0x2d
ahci_ata_bio() at netbsd:ahci_ata_bio+0x2f
wddump() at netbsd:wddump+0x167
raiddump() at netbsd:raiddump+0x227
dumpsys_seg() at netbsd:dumpsys_seg+0xbc
dump_seg_iter() at netbsd:dump_seg_iter+0xfb
dodumpsys() at netbsd:dodumpsys+0x267
dumpsys() at netbsd:dumpsys+0x1d
vpanic() at netbsd:vpanic+0x1dd
printf_nolog() at netbsd:printf_nolog
fill_lwp() at netbsd:fill_lwp
sysctl_dispatch() at netbsd:sysctl_dispatch+0xc6
sys___sysctl() at netbsd:sys___sysctl+0xeb
syscall() at netbsd:syscall+0x94
--- syscall (number 202) ---
7f7ff74e024a:
cpu18: End traceback...
rebooting...