From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <4CBFFF43.2010100@cn.fujitsu.com> Date: Thu, 21 Oct 2010 16:52:19 +0800 From: Li Zefan MIME-Version: 1.0 To: subrata@linux.vnet.ibm.com Subject: Re: [2.6.36-rc7, Power6] LTP Ftrace Stress tests causes KERNEL PANIC and brings the system to xmon References: <1286998463.4893.26.camel@subratamodak.linux.ibm.com> <1287649998.22128.1.camel@subratamodak.linux.ibm.com> In-Reply-To: <1287649998.22128.1.camel@subratamodak.linux.ibm.com> Content-Type: text/plain; charset=UTF-8 Cc: ltp-list , Peter Zijlstra , Peter Zijlstra , linux-kernel , rostedt , Linuxppc-dev List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , (I guess you didn't notice I've also forwarded the bug report to LKML? http://marc.info/?l=3Dlinux-kernel&m=3D128737193919500&w=3D2) Subrata Modak wrote: > Stefen, >=20 > Can you please know your thoughts on this issue ? >=20 Stefen? Steven? :) > Regards-- > Subrata >=20 > On Thu, 2010-10-14 at 01:04 +0530, Subrata Modak wrote: >> Hi, >> >> Executing LTP Ftrace Stress tests on 2.6.36-rc7, Power6 creates kernel >> Panic and xmon is invoked: >> ... >> >> However Peter Zijlstra=C5=9B proposed patch did not fix this issue. Th= e patch >> was >> posted to LTP: >> http://marc.info/?l=3Dltp-list&m=3D128696942432669&w=3D2 >> >> The Kernel paniked even after the patch. However this time th message = was >> different. Other xmon output is also shown below: >> So they are 2 different bugs, and Peter's patch fixed the first one. But that patch is too bug for .36.. For the second bug, as I said, it's a dead loop, and it's PowerPC specifi= c, so better have someone in PPC fixed it, and Steven has proposed to add recursive check. ... >> pid =3D 1668, cc0000000002226b0 .rb_reserve_next_event+0x20c/0x804 >> [c0000000d9f8b9b0] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x= 2a4 >> [c0000000d9f8ba40] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0x= e4 >> [c0000000d9f8baf0] c00000000022ec9c >> .trace_current_buffer_lock_reserve+0x44/0x6c >> [c0000000d9f8bb80] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c= /0x144 >> [c0000000d9f8bc40] c000000000096624 .__trace_hcall_entry+0xa0/0xec >> [c0000000d9f8bcd0] c00000000009786c .plpar_hcall_norets+0x50/0xd0 >> [c0000000d9f8bd40] c0000000000749c8 .__spin_yield+0x130/0x15c >> [c0000000d9f8bdd0] c000000000213458 .trace_clock_global+0x11c/0x2a0 >> [c0000000d9f8be90] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804 >> [c0000000d9f8bfa0] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x= 2a4 >> [c0000000d9f8c030] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0x= e4 >> [c0000000d9f8c0e0] c00000000022ec9c >> .trace_current_buffer_lock_reserve+0x44/0x6c >> [c0000000d9f8c170] c000000000011c5c .ftrace_raw_event_hcall_entry+0x7c= /0x144 >> [c0000000d9f8c230] c000000000096624 .__trace_hcall_entry+0xa0/0xec >> [c0000000d9f8c2c0] c00000000009786c .plpar_hcall_norets+0x50/0xd0 >> [c0000000d9f8c330] c0000000000749c8 .__spin_yield+0x130/0x15c >> [c0000000d9f8c3c0] c000000000213458 .trace_clock_global+0x11c/0x2a0 >> [c0000000d9f8c480] c0000000002226b0 .rb_reserve_next_event+0x20c/0x804 >> [c0000000d9f8c590] c000000000223178 .ring_buffer_lock_reserve+0x24c/0x= 2a4 >> [c0000000d9f8c620] c00000000022d6f4 .trace_buffer_lock_reserve+0x58/0x= e4