Re: panic on shutdown

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

On Mon, Jan 06, 2014 at 01:52:11PM +0000, Patrick Welche wrote:
> Two days running, a nearly -current (Dec 7) 6.99.28/amd64 box
> panics on shutdown with
> 
> System panicked: kernel diagnostic assertion "sdp != NULL" failed: file 
> "/usr/src/sys/uvm/uvm_swap.c", line 1683 
> 
>      $NetBSD: uvm_swap.c,v 1.165 2013/11/23 14:50:40 christos Exp $
> 
> _KERNEL_OPT_NARCNET() at 0
> ?() at fffffe807e886cd0
> vpanic() at vpanic+0x13f
> _etext() at _etext
> uvm_swap_markbad() at uvm_swap_markbad+0x78
> uvmfault_anonget() at uvmfault_anonget+0x34d
> uvm_fault_internal() at uvm_fault_internal+0x103e
> trap() at trap+0x4fa
> --- trap (number 6) ---
> 7f7ff6d0b95c:
> 
> On both occasions said box had been doing a lot of pkgsrc building
> with a tmpfs WRKOBJDIR which would have been quite full, and backed
> by swap. The box runs fine otherwise, the panic just happens on
> shutdown...

Same backtrace with January 7 2013 current (same line number),
though it looked a bit odd on the screen:

panic: kernel diagnostic assertion "sdp != NULL" failed: file "../../..W/A.R.N/I
uNvGm:/ uSvPmL_s wNaOpT. cL"O,W ElRiEnDe  O1N6 8S3Y S
CALL 1 c5p uE0X:I TB efg7ibn1 at0r8a0c e7b
ack...
WARNING: SPL NOT LOWERED ON SYSCALL 116 4 EXIT 4 6
WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT f7b1a080 7
WARNING: SPL NOT LOWERED ON SYSCALL 107 4 EXIT 4 6
WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT f7b1a080 7
WARNING: SPL NOT LOWERED ON SYSCALL 107 4 EXIT 4 6
vpanic() at WARNING: SPL NOT LOWERED ON SYSCALL 1 5 EXIT f7b1a080 7
...
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
22107>   1 7   0         0   fffffe807b14ab60            swapctl
0    >  11 7   1       200   fffffe807f9a58a0            cachegc

The above was from swapctl. Just for completeness, cachegc:
crash> bt/a fffffe807f9a58a0
trace: pid 0 lid 11 at 0xfffffe8004a1dc60
cache_reclaim() at cache_reclaim+0x107
cache_thread() at cache_thread+0x30

Cheers,

Patrick