boot-time crash in today's -current, and other threading problems

Attilio Rao attilio at freebsd.org
Wed Nov 21 11:40:45 PST 2007


2007/11/21, Attilio Rao <attilio at freebsd.org>:
> 2007/11/21, Doug Barton <dougb at freebsd.org>:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: RIPEMD160
> >
> > I'm spamming everyone who's had fingers in the threading code lately
> > since I can't seem to find a specific commit that looks guilty.
> >
> > On 19 Nov. I updated my -current system and noticed a regression where
> > alpine (a new version of the pine mail client that uses threads) would
> > crash while opening my mail folders with a sig 6. I figured I'd wait a
> > day or two since it was obvious that there was some work going on with
> > threads, and other things were working.
> >
> > Today I upgraded again, and the new kernel crashes on startup.
> > Traceback is below. Suggestions welcome.
> >
> > Doug
> >
> > ...
> > bge0: <Broadcom NetXtreme Gigabit Ethernet Controller, ASIC rev.
> > 0x6002> mem 0xecef0000-0xecefffff irq 18 at device 0.0 on pci9
> > miibus0: <MII bus> on bge0
> > brgphy0: <BCM5752 10/100/1000baseTX PHY> PHY 1 on miibus0
> > brgphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,
> > 1000baseT-FDX, auto
> > bge0: Ethernet address: 00:15:c5:55:f0:5b
> > bge0: [ITHREAD]
> >
> >
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 0; apic id = 00
> > fault virtual address   = 0xdeadc0ee
> > fault code              = supervisor read, page not present
> > instruction pointer     = 0x20:0xc0556053
> > stack pointer           = 0x28:0xe5b00c54
> > frame pointer           = 0x28:0xe5b00c64
> > 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         = 11 (swi4: clock sio)
> > Physical memory: 2029 MB
> > Dumping 70 MB: 55 39 23 7
> >
> > #0  doadump () at pcpu.h:195
> > 195     pcpu.h: No such file or directory.
> >         in pcpu.h
> >
> > (kgdb) where
> > #0  doadump () at pcpu.h:195
> > #1  0xc0455619 in db_fncall (dummy1=-441447812, dummy2=0, dummy3=582,
> >     dummy4=0xe5b009e8 "ÀxEÀ") at /usr/local/src/sys/ddb/db_command.c:486
> > #2  0xc0455b85 in db_command_loop () at
> > /usr/local/src/sys/ddb/db_command.c:401
> > #3  0xc04572f5 in db_trap (type=12, code=0)
> >     at /usr/local/src/sys/ddb/db_main.c:222
> > #4  0xc058b136 in kdb_trap (type=12, code=0, tf=0xe5b00c14)
> >     at /usr/local/src/sys/kern/subr_kdb.c:502
> > #5  0xc071f4af in trap_fatal (frame=0xe5b00c14, eva=3735929070)
> >     at /usr/local/src/sys/i386/i386/trap.c:863
> > #6  0xc071f6d0 in trap_pfault (frame=0xe5b00c14, usermode=0,
> > eva=3735929070)
> >     at /usr/local/src/sys/i386/i386/trap.c:785
> > #7  0xc071ff92 in trap (frame=0xe5b00c14)
> >     at /usr/local/src/sys/i386/i386/trap.c:463
> > #8  0xc0706dab in calltrap () at
> > /usr/local/src/sys/i386/i386/exception.s:139
> > #9  0xc0556053 in _mtx_assert (m=0xdeadc0de, what=20,
> >     file=0xc0763525 "/usr/local/src/sys/kern/kern_mutex.c", line=167)
> >     at /usr/local/src/sys/kern/kern_mutex.c:632
> > #10 0xc055676a in unlock_mtx (lock=0xdeadc0de)
> >     at /usr/local/src/sys/kern/kern_mutex.c:167
> > #11 0xc0574c3f in softclock (dummy=0x0)
> >     at /usr/local/src/sys/kern/kern_timeout.c:297
> > #12 0xc0546405 in ithread_loop (arg=0xc54daa00)
> >     at /usr/local/src/sys/kern/kern_intr.c:1034
> > #13 0xc0543988 in fork_exit (callout=0xc0546250 <ithread_loop>,
> >     arg=0xc54daa00, frame=0xe5b00d38)
> >     at /usr/local/src/sys/kern/kern_fork.c:788
> > #14 0xc0706e20 in fork_trampoline ()
> >     at /usr/local/src/sys/i386/i386/exception.s:205
>
> My last callout commit did this.
> Obviously in my tests it didn't get out.
> After a chat with jhb situation is clearer, I will post a patch you
> can try soon.

Adding something else i have no idea what your threading problems are
about to, callout modifies shouldn't affect these.

Attilio


-- 
Peace can only be achieved by understanding - A. Einstein


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