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SubjectRuntime trouble with commit dbd952127d (seccomp: introduce writer locking)
Hi folks,

I am having some trouble with commit dbd952127d (seccomp: introduce
writer locking) when running my qemu tests on the upstream kernel.

With powerpc, I get the following crash.

ftrace: allocating 20093 entries in 59 pages
------------[ cut here ]------------
kernel BUG at kernel/fork.c:1108!
Oops: Exception in kernel mode, sig: 5 [#1]
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 3.16.0-yocto-standard+ #1
task: c08a03d0 ti: c08e4000 task.ti: c08e4000
NIP: c002b98c LR: c002b988 CTR: c03837ec
REGS: c08e5e30 TRAP: 0700 Not tainted (3.16.0-yocto-standard+)
MSR: 00021032 <ME,IR,DR,RI> CR: 22282048 XER: 20000000

GPR00: c002b988 c08e5ee0 c08a03d0 00000001 c0a9b878 00000800 c783603c 00000020
GPR08: c783603c 00000003 00000001 c08f61fc 22222044 00000000 07c5ac10 00800300
GPR16: c7870000 00000010 00000000 07de7fa4 00000000 c08f594c c08f0000 c78702d0
GPR24: 00000000 c08f0000 c08f5940 c000422c c08a8ea0 c7870310 00000000 c7808400
NIP [c002b98c] copy_process.part.52+0x794/0x13e4
LR [c002b988] copy_process.part.52+0x790/0x13e4
Call Trace:
[c08e5ee0] [c002b988] copy_process.part.52+0x790/0x13e4 (unreliable)
[c08e5f60] [c002c768] do_fork+0xb8/0x3bc
[c08e5fa0] [c00041c8] rest_init+0x30/0x94
[c08e5fb0] [c083cf98] start_kernel+0x368/0x37c
[c08e5ff0] [00003438] 0x3438
Instruction dump:
7d400124 38600001 48027e95 55e903e1 41820b84 80e202c0 90f002c0 81420570
91500570 38600001 48027e75 39400001 <0f0a0000> 81420568 8162056c 91500568
---[ end trace dc8fa200cb88537f ]---

With mips (both 32 bit and 64 bit), I get

CPU frequency 200.00 MHz
Console: colour dummy device 80x25
console [tty0] enabled
bootconsole [uart0] disabled

[ and then there is silence ]

In all cases I bisected the problem to the above mentioned commit.

Failures are seen in both linux-next and the tip of Linus' tree.
Test results are on
(look for qwmu results). Build and test scripts are in the mips,
mips64, and powerpc subdirectories of

Any idea, anyone, what might be going on, or how I could do to
help tracking this down ?


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