Reproducible NetBSD 9.0/amd64 panic, but no crash dump

[John Klos <john%ziaspace.com@localhost>]

I've had the same NetBSD 9.0/amd64, compiled from 22-Feb sources, system 
panic twice while trying to run the same workload, which is just fetching 
many static files via command-like ftp continuously. This appears to be 
resproducible since both panics happened within an hour of starting the 
workload.

However, no crash dump was recorded after the panics even though 
kern.dump_on_panic is set. savecore says there's no core dump, there's 
plenty of disk space... Not sure how to diagnose this. Suggestions?

Thanks,
John


[ 236045.981322] uvm_fault(0xffff8cf49ee4fa20, 0x0, 2) -> e
[ 236045.981322] fatal page fault in supervisor mode
[ 236045.981322] trap type 6 code 0x2 rip 0xffffffff8098bb73 cs 0x8 rflags 0x10286 cr2 0 ilevel 0x4 rsp 0xffffc200c0b827f0
[ 236045.981322] curlwp 0xffff8cf4e470e8c0 pid 1070.1 lowest kstack 0xffffc200c0b802c0
[ 236045.981322] panic: trap
[ 236045.981322] cpu3: Begin traceback...
[ 236045.981322] vpanic() at netbsd:vpanic+0x160
[ 236045.981322] snprintf() at netbsd:snprintf
[ 236045.981322] startlwp() at netbsd:startlwp
[ 236045.981322] alltraps() at netbsd:alltraps+0xbb
[ 236045.981322] thmap_del() at netbsd:thmap_del+0x218
[ 236045.981322] npf_conndb_remove() at netbsd:npf_conndb_remove+0x32
[ 236045.981322] npf_conn_establish() at netbsd:npf_conn_establish+0x1b6
[ 236045.981322] npfk_packet_handler() at netbsd:npfk_packet_handler+0x318
[ 236045.981322] pfil_run_hooks() at netbsd:pfil_run_hooks+0x122
[ 236045.991327] ip_output() at netbsd:ip_output+0x49e
[ 236045.991327] tcp_output() at netbsd:tcp_output+0x1970
[ 236045.991327] tcp_connect_wrapper() at netbsd:tcp_connect_wrapper+0x22b
[ 236045.991327] do_sys_connect() at netbsd:do_sys_connect+0x90
[ 236045.991327] sys_connect() at netbsd:sys_connect+0x49
[ 236045.991327] syscall() at netbsd:syscall+0x157
[ 236045.991327] --- syscall (number 98) ---
[ 236045.991327] 759b6e042bfa:
[ 236045.991327] cpu3: End traceback...

[ 236045.991327] dumping to dev 0,1 (offset=16877935, size=2084794):
[ 236045.991327] dump



[  2159.007866] uvm_fault(0xffff8413f09b9458, 0x0, 2) -> e
[  2159.007866] fatal page fault in supervisor mode
[  2159.007866] trap type 6 code 0x2 rip 0xffffffff8098bb73 cs 0x8 rflags 0x10286 cr2 0 ilevel 0x4 rsp 0xffffb900b05fe7f0
[  2159.007866] curlwp 0xffff8414201602c0 pid 6556.1 lowest kstack 0xffffb900b05fc2c0
[  2159.007866] panic: trap
[  2159.007866] cpu3: Begin traceback...
[  2159.007866] vpanic() at netbsd:vpanic+0x160
[  2159.007866] snprintf() at netbsd:snprintf
[  2159.007866] startlwp() at netbsd:startlwp
[  2159.007866] alltraps() at netbsd:alltraps+0xbb
[  2159.007866] thmap_del() at netbsd:thmap_del+0x218
[  2159.007866] npf_conndb_remove() at netbsd:npf_conndb_remove+0x32
[  2159.017872] npf_conn_establish() at netbsd:npf_conn_establish+0x1b6
[  2159.017872] npfk_packet_handler() at netbsd:npfk_packet_handler+0x318
[  2159.017872] pfil_run_hooks() at netbsd:pfil_run_hooks+0x122
[  2159.017872] ip_output() at netbsd:ip_output+0x49e
[  2159.017872] tcp_output() at netbsd:tcp_output+0x1970
[  2159.017872] tcp_connect_wrapper() at netbsd:tcp_connect_wrapper+0x22b
[  2159.017872] do_sys_connect() at netbsd:do_sys_connect+0x90
[  2159.017872] sys_connect() at netbsd:sys_connect+0x49
[  2159.017872] syscall() at netbsd:syscall+0x157
[  2159.017872] --- syscall (number 98) ---
[  2159.017872] 7f2580c42bfa:
[  2159.017872] cpu3: End traceback...

[  2159.017872] dumping to dev 0,1 (offset=16877935, size=2084794):
[  2159.017872] dump