Date: Wed, 12 May 1999 06:26:02 +0800 From: Peter Wemm <peter@netplex.com.au> To: current@freebsd.org Subject: problem with dev_t changes and pageout.. Message-ID: <19990511222604.172D71F73@spinner.netplex.com.au>
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It looks like something has come unstuck:
Fatal trap 12: page fault while in kernel mode
mp_lock = 00000002; cpuid = 0; lapic.id = 00000000
fault virtual address = 0x28
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc017bb67
stack pointer = 0x10:0xc5d97de4
frame pointer = 0x10:0xc5d97df0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 2 (pagedaemon)
interrupt mask = net bio cam <- SMP: XXX
kernel: type 12 trap, code=0
Stopped at spec_strategy+0x93: movl 0x28(%edx),%eax
^^^^^^^^^^^ %edx = null
db> trace
spec_strategy(c5d97e1c) at spec_strategy+0x93
swap_pager_putpages(c02904fc,c5d97ecc,2,0,c5d97e60) at swap_pager_putpages+0x3e1
default_pager_putpages(c02904fc,c5d97ecc,2,0,c5d97e60) at default_pager_putpages+0x17
vm_pageout_flush(c5d97ecc,2,0,c5d97eb0,c02182cf) at vm_pageout_flush+0x91
vm_pageout_clean(c04d6b60,80000000,c013e290,2000,c5d97f78) at vm_pageout_clean+0x1f1
vm_pageout_scan(80000000,c02789c0,c02789c0,c5d97fac,c013e2c3) at vm_pageout_scan+0x45e
vm_pageout(c5d8fdf7,c0255500,c02789c0,c020c640,c020c748) at vm_pageout+0x221
kproc_start(c02789c0) at kproc_start+0x33
fork_trampoline(10b8a0,d88e0000,18b8c08e,8e000000,24448be0) at fork_trampoline+0x30
db> ps
pid proc addr uid ppid pgrp flag stat wmesg wchan cmd
438 c680da40 c6818000 495 282 277 000004 3 biord c332d9c0 p4d
437 c5d8c340 c6802000 433 417 415 004084 3 piperd c6760660 tee
436 c680dd00 c6810000 433 417 415 004004 3 biord c33626f8 p4
418 c680dba0 c6815000 433 415 415 004084 3 piperd c6760700 mail
417 c680de60 c680e000 433 415 415 004084 3 wait c680de60 sh
[..]
The offending line in spec_strategy is:
(*bdevsw(bp->b_dev)->d_strategy)(bp);
d_strategy was null.. I'm still looking.
(I think this is the first time the box paged out since booting a few hours
ago, it's got 128M, but p4d has got a lot of stuff to deal with and can hit
a vsize of 70MB or so.)
Cheers,
-Peter
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