Date: Sat, 30 Dec 2006 02:50:20 GMT From: Geoffrey Giesemann <geoffwa@cs.rmit.edu.au> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/107315: Loading gmirror causes 'Fatal double trap' Message-ID: <200612300250.kBU2oKA9005973@freefall.freebsd.org>
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The following reply was made to PR kern/107315; it has been noted by GNATS. From: Geoffrey Giesemann <geoffwa@cs.rmit.edu.au> To: Remko Lodder <remko@elvandar.org> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: kern/107315: Loading gmirror causes 'Fatal double trap' Date: Sat, 30 Dec 2006 13:48:57 +1100 On Sat, Dec 30, 2006 at 03:10:30AM +1100, Geoffrey Giesemann wrote: > > I'll throw more compilation options at the system and see what happens. > Okay I managed to get into KDB. Here's a more correct output of what happened plus a backtrace: Note that this is manually transcribed -> * indicates where I can't read my own handwriting :( (I *am* setting up a serial console for this) # /sbin/gmirror load GEOM_MIRROR: Device os: created (id = 2867703138) GEOM_MIRROR: Device os: provider ad6 detected GEOM_MIRROR: Device os: provider ad4 detected GEOM_MIRROR: Device os: provider ad6 activated GEOM_MIRROR: Device os: provider ad4 activated GEOM_MIRROR: Device os: provider mirror/os launched (slight pause) Fatal double fault eip = 0xc05a39a7 esp = 0xe365eff8 ebp = 0xe365f03c cpuid = 1; apic id = 08 panic double fault cpuid = 1 KDB: enter: panic [thread pid 2 tid 100001] Stopped at kdb_enter+0x30: leave db> trace Tracing pid 2 tid 100001 td 0xc4afbd80 kdb_enter(c07d3a00,1,c07f61b0,c08ee9a8,c4afbd80,...) at kdb_enter+0x30 panic(c07f61b0,0,0,0,0,...) at panic+0x14e dblfault_handler() at dblfault_handler+0x8c --- trap 0x17, eip = 0xc05a39a7, esp = 0xe365eff8, ebp = 0x365f03c --- witness_checkorder(c0871020,b,c07cf6cb,ce,0,...) at witness_checkorder+0x77 _mtx_lock_spin_flags(c0871020,2,c07cf6cb,ce,c08ebf20,...) at _mtx_lock_spin_flags+0xa5 hardclcok_process(e365f0a8,c056ca6d,c0878500,c08beb98,e365f108,...) at hardclock_process+0x3c lapic_handle_timer(0) at lapic_handle_timer+0x7d Xtimerint(0,c086eda0,c0880ba0,c086eda0,c4ebe800,...) at Xtimerint+0x30 witness_lock(c086eda0,8,c4e9932b,adc,adb,...) at witness_lock+0xb7 _sx_xlock(c086eda0,c4e9932b,adc,***71060,...) at _sx_lock+0xd2 g_mirror_access(c4e7a700,1,0,***,...) at g_mirror_access+0x10a g_access(c4e71800,1,0,32,c4e71800) at g_access+0x24b g_slice_access(c4e71640,1,0,32,31,...) at g_slice_access+0x180 (lots of alternating g_access/g_slice_access calls) g_mirror_read_metadata(c4f79c40,e3660bf0,c4f79c40,c4f66300,c4f85580,...) at g_mirror_read_metadata+0x33 g_mirror_taste(c4e9nn20,c4f66300,0,1bb,c4f55380,...) at g_mirror_taste+0xca one_event(c086eda0,66666667,c4afa218,0,e3660d00,...) at one_event+0x1f2 g_run_events(c086edfc,0,4c,c07ccd87,64,...) at g_run_events+0x15 g_event_procbody(0,e3660d38,c07d0c05,32d,0,...) at g_event_procbody+0x95 fork_exit(c0532990,0,e3660d38) at fork_exit+0xc1 fork_trampoline() at fork_trampoline+0x8 --- trap 0x1, eip = 0, esp = 0xe3660d6c, ebp = 0 --- db> Hope this helps. --Geoff
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