On Wed, Nov 04, 2009 at 06:08:44PM +0530, Sachin Sant wrote: > Sachin Sant wrote: > >Today's next tree failed to boot on a POWER 6 box with : > > > >------------[ cut here ]------------ > >kernel BUG at mm/mmap.c:2135! > >Oops: Exception in kernel mode, sig: 5 [#2] > >SMP NR_CPUS=1024 NUMA pSeries > Problem exists with today's next as well. > > Likely cause for this problem seems to the following commit. > If i revert this patch the machine boots fine. > > commit a0668cdc154e54bf0c85182e0535eea237d53146 > powerpc/mm: Cleanup management of kmem_caches for pagetables Ugh. Ok, it's not at all obvious how my patch could cause this bug. Can you send your .config? > >Modules linked in: ibmvscsic scsi_transport_srp scsi_tgt scsi_mod > >NIP: c00000000014e30c LR: c00000000014e2f8 CTR: c00000000014db88 > >REGS: c0000000db703620 TRAP: 0700 Tainted: G D > >(2.6.32-rc5-autotest-next-20091102) > >MSR: 8000000000029032 <EE,ME,CE,IR,DR> CR: 24022442 XER: 2000000c > >TASK = c0000000db7f6fe0[76] 'init' THREAD: c0000000db700000 CPU: 1 > >GPR00: 0000000000000001 c0000000db7038a0 c000000000b19900 > >0000000000000000 > >GPR04: c0000000db406a40 000000000000000c c0000000fe10c370 > >c000000000bb2800 > >GPR08: 000000000000db40 0000000000000000 c0000000dfdc0e00 > >000000000000000c > >GPR12: 0000000044022442 c000000000bb2800 00000000ffffffff > >ffffffffffffffff > >GPR16: 0000000008430000 00000000003c0000 c0000000db703ea0 > >c0000000db569108 > >GPR20: c0000000db568908 0000000000000000 c0000000db703d60 > >0000000000000000 > >GPR24: 0000000000000001 0000000000040100 c0000000fe503580 > >c0000000db1ac180 > >GPR28: 0000000000000000 c000000000f812d0 c000000000a84f00 > >0000000000000000 > >NIP [c00000000014e30c] .exit_mmap+0x190/0x1b8 > >LR [c00000000014e2f8] .exit_mmap+0x17c/0x1b8 > >Call Trace: > >[c0000000db7038a0] [c00000000014e2f8] .exit_mmap+0x17c/0x1b8 (unreliable) > >[c0000000db703950] [c0000000000916cc] .mmput+0x54/0x164 > >[c0000000db7039e0] [c0000000000968d8] .exit_mm+0x17c/0x1a0 > >[c0000000db703a90] [c000000000098cb8] .do_exit+0x248/0x784 > >[c0000000db703b70] [c0000000000992a8] .do_group_exit+0xb4/0xe8 > >[c0000000db703c00] [c0000000000aca2c] .get_signal_to_deliver+0x3ec/0x478 > >[c0000000db703cf0] [c0000000000134ac] .do_signal+0x6c/0x31c > >[c0000000db703e30] [c000000000008b7c] do_work+0x24/0x28 > >Instruction dump: > >7c8407b4 387d0018 4800ab11 60000000 939d0008 7fe3fb78 4bfffdbd 7c7f1b79 > >4082fff4 e81b00e8 3120ffff 7c090110 <0b000000> 382100b0 e8010010 eb61ffd8 > >---[ end trace ec052ac77a8e7cb4 ]--- > >Fixing recursive fault but reboot is needed! > > > >mm/mmap.c:2135 corresponds to : > > > >BUG_ON(mm->nr_ptes > (FIRST_USER_ADDRESS+PMD_SIZE-1)>>PMD_SHIFT); > > > -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
