I have just hit a fossil deadlock. the symptom is simple enough, fossil wedged, stats continued to be updated and I could run whatis in a rio window but any attempt to access the local fossil caused the command to hang.
I was trying to mirror sources when it happened so I had a lot of processes all writing to fossil at the same time - well, perhaps a dozen. If anyone is interested I have put my 9pccpuf and a phone camera image of ^t^t^p of the hang in http://www.quintile.net/doorstep/deadlock.jpg and http://www.quintile.net/doorstep/9pccpuf. If anyone extracts info from this I would like to learn how they do it. I made a feeble attempt to diagnose the problem myself (below) and it looks as though it was trying to swap, however, though I do have a /dev/sdXX/swap I believe I have disabled the one place where swap is enabled (/cfg/$sysname/cpurc). having said this I think /dev/mem is indicating that I _do_ have swap enabled. either way I should not have been swapping as I have masses of free RAM. -Steve (confused) cpu% acid /386/9pccpuf /386/9pccpuf:386 plan 9 boot image /sys/lib/acid/port /sys/lib/acid/386 acid: src(0xf01d3968) /sys/src/9/port/fault.c:231 226 k = kmap(new); 227 kaddr = (char*)VA(k); 228 229 if(loadrec == 0) { /* This is demand load */ 230 c = s->image->c; >231 while(waserror()) { 232 if(strcmp(up->errstr, Eintr) == 0) 233 continue; 234 kunmap(k); 235 putpage(new); 236 faulterror("sys: demand load I/O error", c, 0); acid: src(0xf01d730f) /sys/src/9/port/proc.c:576 571 /* Only reliable way to see if we are Running */ 572 if(p->mach == 0) { 573 p->newtlb = 1; 574 ok = 1; 575 } >576 unlock(runq); 577 spllo(); 578 579 return ok; 580 } 581 acid: cpu% cpu% cat /dev/swap 2134908928 memory 4096 pagesize 27037 kernel 112466/494181 user 0/160000 swap 4588640/71348716 kernel malloc 0/16777216 kernel draw cpu% grep swap /cfg/$sysname/cpurc # swap is broken # swap `{ls /dev/fs/swap /dev/sd*/swap >[2] /dev/null | sed 1q}
