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Date:      Tue, 18 Nov 2014 20:59:35 +0300 (MSK)
From:      Dmitry Morozovsky <marck@rinet.ru>
To:        Steven Hartland <steven@multiplay.co.uk>
Cc:        "stable@freebsd.org" <stable@freebsd.org>, "smh@freebsd.org" <smh@freebsd.org>
Subject:   Re: ZFS panic: [Re: stable/10 panic under disk load]
Message-ID:  <alpine.BSF.2.00.1411182057140.2113@woozle.rinet.ru>
In-Reply-To: <-7425247475772590723@unknownmsgid>
References:  <alpine.BSF.2.00.1411181913110.2113@woozle.rinet.ru> <alpine.BSF.2.00.1411181950450.2113@woozle.rinet.ru> <-7425247475772590723@unknownmsgid>

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On Tue, 18 Nov 2014, Steven Hartland wrote:

> Can u plug a usb drive in to get a dump?

Hm, will it work over USB stack? I can try this.

BTW: it seems some internal ZFS locking trouble exists, as trere are 3 cases:

pool/R/fs1 mounted as /fs1
pool/R/fs2
pool/R/fs3

tar cf - /fs1 >/dev/null works ok
tar cf - /fs2 >/dev/null works ok
rsync -avHP /fs1/ /fs2/ panics in few minutes

will try to configure dump to USB SATA

> 
> 
> > On 18 Nov 2014, at 16:57, Dmitry Morozovsky <marck@rinet.ru> wrote:
> >
> >> On Tue, 18 Nov 2014, Dmitry Morozovsky wrote:
> >>
> >> my backup server after updrade to frest stable/10
> >>
> >> start panicing on heavy disk load like rsync at
> >
> > Yes, it is reproducible easy and now I'm at ddb prompt with
> >
> > cpuid = 0
> > KDB: stack backtrace:
> > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0860864d60
> > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe0860864e10
> > vpanic() at vpanic+0x126/frame 0xfffffe0860864e50
> > panic() at panic+0x43/frame 0xfffffe0860864eb0
> > vm_fault_hold() at vm_fault_hold+0x1932/frame 0xfffffe0860865100
> > vm_fault() at vm_fault+0x77/frame 0xfffffe0860865140
> > trap_pfault() at trap_pfault+0x201/frame 0xfffffe08608651e0
> > trap() at trap+0x47a/frame 0xfffffe08608653f0
> > calltrap() at calltrap+0x8/frame 0xfffffe08608653f0
> > --- trap 0xc, rip = 0xffffffff81b69d04, rsp = 0xfffffe08608654b0, rbp =
> > 0xfffffe0860865500 ---
> > zap_leaf_lookup_closest() at zap_leaf_lookup_closest+0xb4/frame
> > 0xfffffe0860865500
> > fzap_cursor_retrieve() at fzap_cursor_retrieve+0x16e/frame 0xfffffe0860865570
> > zap_cursor_retrieve() at zap_cursor_retrieve+0x1f7/frame 0xfffffe0860865600
> > zfs_freebsd_readdir() at zfs_freebsd_readdir+0x426/frame 0xfffffe0860865840
> > VOP_READDIR_APV() at VOP_READDIR_APV+0xa7/frame 0xfffffe0860865870
> > kern_getdirentries() at kern_getdirentries+0x21c/frame 0xfffffe0860865970
> > sys_getdirentries() at sys_getdirentries+0x28/frame 0xfffffe08608659a0
> > amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe0860865ab0
> > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0860865ab0
> > --- syscall (196, FreeBSD ELF64, sys_getdirentries), rip = 0x80091043a, rsp =
> > 0x7fffffffb538, rbp = 0x7fffffffb560 ---
> > KDB: enter: panic
> > [ thread pid 1167 tid 100461 ]
> > Stopped at      kdb_enter+0x3e: movq    $0,kdb_why
> > db>
> >
> > Can I obtain somthing useful from here?  I'm afraid it's not easy to attach
> > additional disk for crash dumps to this server...
> >
> >
> >>
> >> FreeBSD whale.rinet.ru 10.1-STABLE FreeBSD 10.1-STABLE #195 r274646: Tue Nov 18
> >> 12:15:24 MSK 2014
> >> marck@castor.rinet.ru:/usr/obj/FreeBSD/pristine/src.10/sys/GENERIC  amd64
> >>
> >>
> >> panic: vm_fault: fault on nofault entry, addr: fffffe001805b000
> >> cpuid = 0
> >> KDB: stack backtrace:
> >> #0 0xffffffff80964fa0 at kdb_backtrace+0x60
> >> #1 0xffffffff8092a085 at panic+0x155
> >> #2 0xffffffff80ba168e at vm_fault_hold+0x1b6e
> >> #3 0xffffffff80b9fad7 at vm_fault+0x77
> >> #4 0xffffffff80d2861c at trap_pfault+0x19c
> >> #5 0xffffffff80d27dea at trap+0x47a
> >> #6 0xffffffff80d0db92 at calltrap+0x8
> >> #7 0xffffffff819df8ee at fzap_cursor_retrieve+0x16e
> >> #8 0xffffffff819e4c97 at zap_cursor_retrieve+0x1f7
> >> #9 0xffffffff81a1fed6 at zfs_freebsd_readdir+0x426
> >> #10 0xffffffff80e456b7 at VOP_READDIR_APV+0xa7
> >> #11 0xffffffff809d68cc at kern_getdirentries+0x21c
> >> #12 0xffffffff809d6688 at sys_getdirentries+0x28
> >> #13 0xffffffff80d28da1 at amd64_syscall+0x351
> >> #14 0xffffffff80d0de7b at Xfast_syscall+0xfb
> >> Uptime: 1m51s
> >>
> >> Unfortunately it's ZFS only, so I have no space to white panic dump.
> >>
> >> I'm now trying to rebuild kernel with debugger turned on, as luckily I have
> >> working console@SOL...
> >>
> >> Any preliminary hints?
> >>
> >>
> >
> > --
> > Sincerely,
> > D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
> > [ FreeBSD committer:                                 marck@FreeBSD.org ]
> > ------------------------------------------------------------------------
> > *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
> > ------------------------------------------------------------------------
> _______________________________________________
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> 

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck@FreeBSD.org ]
------------------------------------------------------------------------
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
------------------------------------------------------------------------



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