Re: Stack Overflow in GEOM

In message <1257671366135276_at_web6f.yandex.ru>, "Ilya A. Arkhipov" writes:
> 16.04.2013, 21:56, "Cy Schubert" <Cy.Schubert_at_komquats.com>:
> > Has anyone see this before? Just updated my CURRENT partitions on my
> > testbed and laptop. The laptop just boots but I've managed to capture this
> > on my testbed (attached to a serial port on another system).
> >
> > This is HEAD from yesterday (Apr 15) morning (PDT). The partition being
> > booted is ada0s1d. On my laptop it's ada0s3a. KSTACK_PAGES is 4. Is there a
> > way to quickly display that kern.kstack_pages from DDB?
> >
> > ada0 at ata0 bus 0 scbus0 target 0 lun 0
> > ada0: <SAMSUNG SP0802N TK100-24> ATA-7 device
> > ada0: 100.000MB/s transfers (UDMA5, PIO 8192bytes)
> > ada0: 76351MB (156368016 512 byte sectors: 16H 63S/T 16383C)
> > ada0: Previously was known as ad0
> > ada1 at ata0 bus 0 scbus0 target 1 lun 0
> > ada1: <Maxtor 6Y120P0 YAR41BW0> ATA-7 device
> > ada1: 133.000MB/s transfers (UDMA6, PIO 8192bytes)
> > ada1: 117246MB (240121728 512 byte sectors: 16H 63S/T 16383C)
> > ada1: Previously was known as ad1
> > ada2 at ata2 bus 0 scbus2 target 0 lun 0
> > ada2: <WDC WD5000AAKS-00D2B0 12.01C02> ATA-8 SATA 2.x device
> > ada2: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes)
> > ada2: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
> > ada2: Previously was known as ad4
> > ada3 at ata3 bus 0 scbus3 target 0 lun 0
> > ada3: <WDC WD3200KS-00PFB0 21.00M21> ATA-7 SATA 2.x device
> > ada3: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes)
> > ada3: 305245MB (625142448 512 byte sectors: 16H 63S/T 16383C)
> > ada3: Previously was known as ad6
> > SMP: AP CPU #1 Launched!
> > panic: stack overflow detected; backtrace may be corrupted
> > cpuid = 1
> > KDB: enter: panic
> > [ thread pid 13 tid 100009 ]
> > Stopped at ššššškdb_enter+0x3d: movl ššš$0,kdb_why
> > db> bt
> > Tracing pid 13 tid 100009 td 0x872d6000
> > kdb_enter(80ca7886,80ca7886,80ca9523,86edcae0,1,...) at
> > kdb_enter+0x3d/frame 0x86edca98
> > panic(80ca9523,86edcb70,80713dd2,86edcbd8,86edcafc,...) at
> > panic+0x141/frame 0x86edcad4
> > __stack_chk_init(86edcbd8,86edcafc,86edcaf8,86edcafc,64,...) at
> > __stack_chk_init/frame 0x86edcae0
> > g_label_disk_ident_taste(87b7dc80,86edcbd8,80,0,0,...) at
> > g_label_disk_ident_taste+0x102/frame 0x86edcb70
> > g_label_taste(80d26b88,872ff500,0,872ff480,872d6000,...) at
> > g_label_taste+0x3ca/frame 0x86edcc6c
> > g_new_provider_event(872ff500,0,25c,80c9798e,0,...) at
> > g_new_provider_event+0xb1/frame 0x86edcc88
> > g_run_events(0,86edcd08,222db60d,83725616,b10094f2,...) at
> > g_run_events+0x19f/frame 0x86edccc4
> > fork_exit(8070d140,0,86edcd08) at fork_exit+0xa3/frame 0x86edccf4
> > fork_trampoline() at fork_trampoline+0x8/frame 0x86edccf4
> > --- trap 0, eip = 0, esp = 0x86edcd40, ebp = 0 ---
> > db>
> >
> > I've been poking at this off and on last night. Any ideas?
> >
> > --
> > Cheers,
> > Cy Schubert <Cy.Schubert_at_komquats.com>
> > FreeBSD UNIX: š<cy_at_FreeBSD.org> ššWeb: šhttp://www.FreeBSD.org
> >
> > _______________________________________________
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> > http://lists.freebsd.org/mailman/listinfo/freebsd-current
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> 
> Hi,
> 
> It should be related with: http://docs.freebsd.org/cgi/getmsg.cgi?fetch=30160
> 3+0+current/svn-src-head
> 
> Author: ivoras
> Date: Mon Apr 15 16:09:24 2013
> New Revision: 249508
> URL: http://svnweb.freebsd.org/changeset/base/249508
> 
> Log:
>   Introduce glabel labels based on GEOM ident attributes. In this initial
>   implementation, error on the side of conservatism and only create labels
>   for GEOMs of classes DISK and MULTIPATH.
> 
>   Discussed with: trasz
>   Approved by: silence from freebsd-geom_at_

You were correct. Backing out r249508 in my tree resolves the panic on both 
hosts.


-- 
Cheers,
Cy Schubert <Cy.Schubert_at_komquats.com>
FreeBSD UNIX:  <cy_at_FreeBSD.org>   Web:  http://www.FreeBSD.org