linux-kernel - Re: [BUG -next] "mm: per-thread vma caching fix 5" breaks s390

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Date:	Tue, 18 Mar 2014 16:06:59 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [BUG -next] "mm: per-thread vma caching fix 5" breaks s390

On Tue, Mar 18, 2014 at 5:41 AM, Heiko Carstens
<heiko.carstens@...ibm.com> wrote:
> Given that this is just an addon patch to Davidlohr's "mm: per-thread
> vma caching" patch I was wondering if something in there is architecture
> specific.
> But it doesn't look like that. So I'm wondering if this only breaks on
> s390?

I'm seeing this same BUG_ON() on ia64 (when trying out next-20140318)

Starting HAkernel BUG at mm/vmacache.c:76!
L daemon7[?25lps[3259]: bugcheck! 0 [1]
Modules linked in: mptctl

CPU: 0 PID: 3259 Comm: ps Not tainted 3.14.0-rc7-zx1-smp-next-20140318 #1
Hardware name: hp server rx2620                   , BIOS 03.17
                                                   03/31/2005
task: e000000001070000 ti: e000000001070c80 task.ti: e000000001070c80
psr : 0000101008526038 ifs : 8000000000000309 ip  :
[<a00000010019a930>]    Not tainted (3.14.0-rc7-zx1-smp-next-20140318)
ip is at vmacache_find+0x1d0/0x1e0
unat: 0000000000000000 pfs : 0000000000000309 rsc : 0000000000000003
rnat: 0009804c0270033f bsps: a00000010153e470 pr  : 0000000019a99565
ldrs: 0000000000000000 ccv : 00000010e0bb89b1 fpsr: 0009804c0270033f
csd : 0000000000000000 ssd : 0000000000000000
b0  : a00000010019a930 b6  : a0000001006cff20 b7  : a0000001006d1a40
f6  : 1003e000000167080aa40 f7  : 1003e0000000000000514
f8  : 1003e000000167080a52c f9  : 1003e0000000000000001
f10 : 1003e501ac672552bd930 f11 : 1003e0000000000000004
r1  : a00000010176aa00 r2  : a00000010153e468 r3  : a00000010156b5e0
r8  : 000000000000001f r9  : 0000000000001b14 r10 : ffffffffffffffff
r11 : 0000000000000000 r12 : e000000001077df0 r13 : e000000001070000
r14 : a00000010153e470 r15 : a00000010153e470 r16 : 000000001b140d8a
r17 : 0000000000000000 r18 : 0000000000007fff r19 : 0000000000000182
r20 : 0000000000000003 r21 : 0000000000000000 r22 : 0000000000000182
r23 : a00000010130a9a8 r24 : a0000001006cff20 r25 : a00000010130a9a8
r26 : a0000001006cff20 r27 : a000000101544658 r28 : a0000001015e2508
r29 : a00000010130a998 r30 : a0000001006cfec0 r31 : a0000001015e23e0

Call Trace:
 [<a000000100015460>] show_stack+0x80/0xa0
                                sp=e0000000010779b0 bsp=e0000000010712e0
 [<a000000100015ac0>] show_regs+0x640/0x920
                                sp=e000000001077b80 bsp=e000000001071288
 [<a0000001000424c0>] die+0x1a0/0x2e0
                                sp=e000000001077b90 bsp=e000000001071248
 [<a000000100042650>] die_if_kernel+0x50/0x80
                                sp=e000000001077b90 bsp=e000000001071218
 [<a000000100f3df10>] ia64_bad_break+0x3d0/0x6e0
                                sp=e000000001077b90 bsp=e0000000010711e8
 [<a00000010000c740>] ia64_native_leave_kernel+0x0/0x270
                                sp=e000000001077c20 bsp=e0000000010711e8
 [<a00000010019a930>] vmacache_find+0x1d0/0x1e0
                                sp=e000000001077df0 bsp=e0000000010711a0
 [<a0000001001b4cb0>] find_vma+0x30/0x140
                                sp=e000000001077df0 bsp=e000000001071170
 [<a0000001001b4df0>] find_extend_vma+0x30/0x140
                                sp=e000000001077df0 bsp=e000000001071138
 [<a0000001001a9080>] __get_user_pages+0x120/0xd60
                                sp=e000000001077df0 bsp=e000000001071010
 [<a0000001001a9dd0>] get_user_pages+0x70/0xa0
                                sp=e000000001077e10 bsp=e000000001070fb0
 [<a0000001001a9eb0>] __access_remote_vm+0xb0/0x360
                                sp=e000000001077e10 bsp=e000000001070f18
 [<a0000001001aa1c0>] access_process_vm+0x60/0xa0
                                sp=e000000001077e20 bsp=e000000001070ed0
 [<a00000010018a390>] get_cmdline+0xb0/0x240
                                sp=e000000001077e20 bsp=e000000001070e88
 [<a0000001002ca2f0>] proc_pid_cmdline+0x30/0x60
                                sp=e000000001077e20 bsp=e000000001070e60
 [<a0000001002c7880>] proc_info_read+0x120/0x200
                                sp=e000000001077e20 bsp=e000000001070e10
 [<a000000100201da0>] vfs_read+0x140/0x340
                                sp=e000000001077e20 bsp=e000000001070dc0
 [<a000000100202180>] SyS_read+0xa0/0x120
                                sp=e000000001077e20 bsp=e000000001070d40
 [<a00000010000c5c0>] ia64_ret_from_syscall+0x0/0x20
                                sp=e000000001077e30 bsp=e000000001070d40
 [<a000000000040720>] ia64_ivt+0xffffffff00040720/0x400
                                sp=e000000001078000 bsp=e000000001070d40
Disabling lock debugging due to kernel taint
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