[powerpc] Next tree Nov 2 : kernel BUG at mm/mmap.c:2135!

[Sachin Sant]

Stephen Rothwell wrote:
> Hi all,
>
> Changes since 20091030:
>   
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
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);

3:mon> di 0xc00000000014e300
c00000000014e300  e81b00e8      ld      r0,232(r27)
c00000000014e304  3120ffff      addic   r9,r0,-1
c00000000014e308  7c090110      subfe   r0,r9,r0
c00000000014e30c  0b000000      tdnei   r0,0
c00000000014e310  382100b0      addi    r1,r1,176
c00000000014e314  e8010010      ld      r0,16(r1)
c00000000014e318  eb61ffd8      ld      r27,-40(r1)
c00000000014e31c  7c0803a6      mtlr    r0
c00000000014e320  eb81ffe0      ld      r28,-32(r1)
c00000000014e324  eba1ffe8      ld      r29,-24(r1)
c00000000014e328  ebc1fff0      ld      r30,-16(r1)
c00000000014e32c  ebe1fff8      ld      r31,-8(r1)
c00000000014e330  4e800020      blr
c00000000014e334  fb21ffc8      std     r25,-56(r1)
c00000000014e338  7c0802a6      mflr    r0
c00000000014e33c  fb81ffe0      std     r28,-32(r1)
3:mon> r
R00 = 0000000000000001   R16 = 0000000030daf420
R01 = c0000000fae37a60   R17 = 0000000000000002
R02 = c000000000b19900   R18 = 0000000000000000
R03 = 0000000000000000   R19 = 0000000030d903b0
R04 = c0000000fabd8670   R20 = 0000000000000000
R05 = c000000000a4d600   R21 = 0000000000000000
R06 = 0000000000000003   R22 = 0000000000000000
R07 = c000000000bb2c00   R23 = 0000000030daf340
R08 = 000000000000fabd   R24 = 0000000000000001
R09 = 0000000000000000   R25 = 00000fffc2402158
R10 = c0000000fffb2958   R26 = 00000fffb793df80
R11 = 0000000000000005   R27 = c0000000fa9aa580
R12 = 0000000044000442   R28 = 0000000000000000
R13 = c000000000bb2c00   R29 = c000000000fc12d0
R14 = 00000000ffffffff   R30 = c000000000a84f00
R15 = ffffffffffffffff   R31 = 0000000000000000
pc  = c00000000014e30c .exit_mmap+0x190/0x1b8
lr  = c00000000014e2f8 .exit_mmap+0x17c/0x1b8
msr = 8000000000029032   cr  = 24000442
ctr = c0000000002f0cb0   xer = 000000002000000a   trap =  700
3:mon>

Have attached the boot log. Next tree for 20091030 worked fine.

Thanks
-Sachin

-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
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