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Re: Crash on -current in pool_drain()

On 10/18/15 00:30, Paul Goyette wrote:
Under heavy load, and after several hours of building packages, I am
seeing the following crash.  I'm doing a bisect to narrow down more,
but it has been happening at least a week ago, with kernel and all
modules build from sources updated on 2015-10-13 at 08:30:00 UTC.

(This is on amd64)

Here's the backtrace from gdb:

#8  0xffffffff80333415 in pool_drain (ppp=ppp@entry=0xfffffe810f528e30)
    at /build/netbsd-local/src/sys/kern/subr_pool.c:1429
#9  0xffffffff802d1791 in uvm_pageout (arg=<optimized out>)
    at /build/netbsd-local/src/sys/uvm/uvm_pdaemon.c:343
#10 0xffffffff80100807 in lwp_trampoline ()
#11 0x0000000000000000 in ?? ()
(gdb) fr 8
#8  0xffffffff80333415 in pool_drain (ppp=ppp@entry=0xfffffe810f528e30)
    at /build/netbsd-local/src/sys/kern/subr_pool.c:1429
1429                    if (drainpp == NULL) {
(gdb) disass pool_drain

This looks like one of the crashes riz@ had on a tegra which I think was also
building packages.

=> 0xffffffff80333415 <+59>:    mov (%rax),%rdx

I think %rax will be "weird" and indicate pool_head list corruption - no idea why, though.


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