Thanks for making things clear.
---
Yura

On Mar 18, 2011, at 10:11 PM, Colin Percival wrote:

> On 03/18/11 02:56, Yuriy Kohut wrote:
>> I got kernel panics while was compiling GHC from ports:
>> 
>> ===>  Configuring for hs-ghc-paths-0.1.0.5_1
>> [1 of 1] Compiling Main             ( Setup.hs, Setup.o )
>> Linking setup ...
>> gcc: Internal error: Killed: 9 (program ld)
>> Please submit a full bug report.
>> See <URL:http://gcc.gnu.org/bugs.html> for instructions.
>> *** Error code 1
> 
> That's not a kernel panic...
> 
>> The panic details are (from main console):
>> 
>> lock order reversal:
>> 1st 0xc05b08c4 PMAP2 (PMAP2) @ /usr/src/sys/i386/xen/pmap.c:1049
>> 2nd 0xc054de04 vm page queue mutex (vm page queue mutex) @ 
>> /usr/src/sys/i386/xen/pmap.c:1073
>> KDB: stack backtrace:
>> X_db_sym_numargs(c0363f9a,c03e8cbc,282,0,a3481215,...) at 
>> X_db_sym_numargs+0x146
>> kdb_backtrace(c010e74b,c0366eaf,c16ca5f0,c16ca178,cca6eab8,...) at 
>> kdb_backtrace+0x2a
>> witness_display_spinlock(c0366eaf,c054de04,c03670bc,c16ca178,c038d96c,...) 
>> at witness_display_spinlock+0x75
>> witness_checkorder(c054de04,9,c038d96c,431,0,...) at witness_checkorder+0x839
>> _mtx_lock_flags(c054de04,0,c038d96c,431,292,...) at _mtx_lock_flags+0xc4
>> pmap_extract(c1ae78fc,28202000,4,c035f3ba,c1ae78fc,...) at pmap_extract+0x1c8
>> vm_fault_unwire(c1ae784c,28202000,28203000,0,0,...) at vm_fault_unwire+0x32
>> vm_map_delete(c1ae784c,1000,bf800000,1,c1ae784c,...) at vm_map_delete+0x17f
>> vm_map_remove(c1ae784c,1000,bf800000,0,c1b2d7f8,...) at vm_map_remove+0x51
>> vmspace_exit(c18f82d0,0,c035bd35,12d,cca6ec60,...) at vmspace_exit+0xbf
>> exit1(c18f82d0,0,cca6ec8c,c0117f86,c18f82d0,...) at exit1+0x5db
>> sys_exit(c18f82d0,cca6ecfc,cca6ed38,c0365893,0,...) at sys_exit+0x1d
>> syscallenter(c18f82d0,cca6ecf4,cca6ecf4,0,c03335ea,...) at syscallenter+0x246
>> syscall(cca6ed38) at syscall+0x34
>> Xint0x80_syscall() at Xint0x80_syscall+0x22
>> --- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x280ff32f, esp = 
>> 0xbf7fe72c, ebp = 0xbf7fe738 ---
> 
> This is a known LOR, but shouldn't cause a kernel panic.
> 
> -- 
> Colin Percival
> Security Officer, FreeBSD | freebsd.org | The power to serve
> Founder / author, Tarsnap | tarsnap.com | Online backups for the truly 
> paranoid

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