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Date: Mon, 25 Oct 2010 18:09:25 +0200 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Jason Baron <jbaron@...hat.com> Cc: Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Frederic Weisbecker <fweisbec@...il.com>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Arnaldo Carvalho de Melo <acme@...hat.com>, masami.hiramatsu.pt@...achi.com Subject: Re: [PATCH][GIT PULL] tracing: Fix compile issue for trace_sched_wakeup.c On Mon, 2010-10-25 at 11:55 -0400, Jason Baron wrote: > but it would be > interesting to test a 4.5 version in the failure cases - I will look at > that shortly. 4.5.1 explodes in a very similar and very reproducable manner for me: [ 22.660537] Testing event hrtimer_expire_entry: [ 22.665071] Symbol: __run_hrtimer @ c103bfc5 0x103 [ 22.670061] Ideal-NOP: 0f 1f 44 00 00 [ 22.673907] Transform: c103c02c -> e9 03 00 00 00 [ 22.678793] Code: 55 57 56 53 89 c3 83 ec 08 8b 68 20 89 54 24 04 8b 7d 00 9c 58 8d 74 26 00 f6 c4 02 74 0f ba bd 04 00 00 b8 0b 8e 35 c1 e8 e0 94 fe ff 0f 1f 44 00 00 eb 19 8b 35 f0 2c 40 c1 85 f6 74 0f 8b 46 04 89 da ff 16 83 c6 08 83 3e 00 eb ef 89 d8 b9 02 00 00 00 89 ea 6a 00 e8 b5 fe ff ff 8b 43 1c 89 44 24 04 f0 fe 07 <0f> 1f 44 00 00 59 eb 1d 8b 35 b0 2c 40 c1 85 f6 74 13 8b 46 04 89 da 8b 4c 24 04 ff 16 83 c6 08 83 3e 00 eb eb 89 d8 ff 14 24 89 04 24 0f 1f 44 00 00 eb 19 8b 35 d0 2c 40 c1 85 f6 74 0f 8b 46 04 89 da ff 16 83 c6 08 83 3e 00 eb ef 89 f8 e8 ab 7c 27 00 83 3c 24 00 74 11 83 7b 24 02 74 02 0f 0b 89 ea 89 d8 e8 a8 fe ff ff f6 43 24 02 75 1f 80 3d d4 ec 58 c1 01 74 16 ba d9 04 00 00 b8 0b 8e 35 c1 e8 1d 94 fe ff c6 05 d4 ec 58 c1 01 83 63 24 fd 83 c4 08 5b 5e 5f 5d c3 [ 22.752911] Symbol: __run_hrtimer @ c103bfc5 0x103 [ 22.757695] Ideal-NOP: 0f [ 22.760000] BUG: unable to handle kernel NULL pointer dereference at (null) [ 22.760002] IP: [<(null)>] (null) [ 22.760005] *pde = 00000000 [ 22.760006] Oops: 0000 [#1] SMP [ 22.760008] last sysfs file: [ 22.760010] Modules linked in: [ 22.760011] [ 22.760013] Pid: 0, comm: swapper Not tainted 2.6.36-tip-05833-g9db2fad-dirty #15 X8DTN/X8DTN [ 22.760015] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 0 [ 22.760017] EIP is at 0x0 [ 22.760019] EAX: f5806a94 EBX: f5806a94 ECX: 00010000 EDX: 00000092 [ 22.760021] ESI: f4859e90 EDI: f5806a00 EBP: f5806a30 ESP: c13d3f24 [ 22.760023] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 22.760025] Process swapper (pid: 0, ti=c13d2000 task=c13d6f20 task.ti=c13d2000) [ 22.760025] Stack: [ 22.760025] c103c056 00000000 c1044ac0 c13d3f60 ffffffff 7fffffff 0000002c f5806a04 [ 22.760025] c103c7d7 f5806a00 00000000 4c9a11f7 00000005 4c9a11f7 00000005 4c9a11f7 [ 22.760025] 00000005 00000000 f5805dac 00000000 c1414308 c1011b20 c13d2000 00000000 [ 22.760025] Call Trace: [ 22.760025] [<c103c056>] ? __run_hrtimer+0x91/0x103 [ 22.760025] [<c1044ac0>] ? tick_sched_timer+0x0/0x1a1 [ 22.760025] [<c103c7d7>] ? hrtimer_interrupt+0xd6/0x1b4 [ 22.760025] [<c1011b20>] ? smp_apic_timer_interrupt+0x66/0x75 [ 22.760025] [<c12b46aa>] ? apic_timer_interrupt+0x36/0x3c [ 22.760025] [<c10070d1>] ? mwait_idle+0x8d/0x9d [ 22.760025] [<c1001c20>] ? cpu_idle+0x8a/0xcb [ 22.760025] [<c14166c8>] ? start_kernel+0x2d5/0x2da [ 22.760025] Code: Bad EIP value. [ 22.760025] EIP: [<00000000>] 0x0 SS:ESP 0068:c13d3f24 [ 22.760025] CR2: 0000000000000000 [ 22.760025] ---[ end trace b2ee13bd16d5c929 ]--- All code ======== 0: 55 push %ebp 1: 57 push %edi 2: 56 push %esi 3: 53 push %ebx 4: 89 c3 mov %eax,%ebx 6: 83 ec 08 sub $0x8,%esp 9: 8b 68 20 mov 0x20(%eax),%ebp c: 89 54 24 04 mov %edx,0x4(%esp) 10: 8b 7d 00 mov 0x0(%ebp),%edi 13: 9c pushf 14: 58 pop %eax 15: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi 19: f6 c4 02 test $0x2,%ah 1c: 74 0f je 0x2d 1e: ba bd 04 00 00 mov $0x4bd,%edx 23: b8 0b 8e 35 c1 mov $0xc1358e0b,%eax 28: e8 e0 94 fe ff call 0xfffe950d 2d: 0f 1f 44 00 00 nopl 0x0(%eax,%eax,1) 32: eb 19 jmp 0x4d 34: 8b 35 f0 2c 40 c1 mov 0xc1402cf0,%esi 3a: 85 f6 test %esi,%esi 3c: 74 0f je 0x4d 3e: 8b 46 04 mov 0x4(%esi),%eax 41: 89 da mov %ebx,%edx 43: ff 16 call *(%esi) 45: 83 c6 08 add $0x8,%esi 48: 83 3e 00 cmpl $0x0,(%esi) 4b: eb ef jmp 0x3c 4d: 89 d8 mov %ebx,%eax 4f: b9 02 00 00 00 mov $0x2,%ecx 54: 89 ea mov %ebp,%edx 56: 6a 00 push $0x0 58: e8 b5 fe ff ff call 0xffffff12 5d: 8b 43 1c mov 0x1c(%ebx),%eax 60: 89 44 24 04 mov %eax,0x4(%esp) 64: f0 fe 07 lock incb (%edi) 67:* 0f 1f 44 00 00 nopl 0x0(%eax,%eax,1) <-- trapping instruction 6c: 59 pop %ecx 6d: eb 1d jmp 0x8c 6f: 8b 35 b0 2c 40 c1 mov 0xc1402cb0,%esi 75: 85 f6 test %esi,%esi 77: 74 13 je 0x8c 79: 8b 46 04 mov 0x4(%esi),%eax 7c: 89 da mov %ebx,%edx 7e: 8b 4c 24 04 mov 0x4(%esp),%ecx 82: ff 16 call *(%esi) 84: 83 c6 08 add $0x8,%esi 87: 83 3e 00 cmpl $0x0,(%esi) 8a: eb eb jmp 0x77 8c: 89 d8 mov %ebx,%eax 8e: ff 14 24 call *(%esp) 91: 89 04 24 mov %eax,(%esp) 94: 0f 1f 44 00 00 nopl 0x0(%eax,%eax,1) 99: eb 19 jmp 0xb4 9b: 8b 35 d0 2c 40 c1 mov 0xc1402cd0,%esi a1: 85 f6 test %esi,%esi a3: 74 0f je 0xb4 a5: 8b 46 04 mov 0x4(%esi),%eax a8: 89 da mov %ebx,%edx aa: ff 16 call *(%esi) ac: 83 c6 08 add $0x8,%esi af: 83 3e 00 cmpl $0x0,(%esi) b2: eb ef jmp 0xa3 b4: 89 f8 mov %edi,%eax b6: e8 ab 7c 27 00 call 0x277d66 bb: 83 3c 24 00 cmpl $0x0,(%esp) bf: 74 11 je 0xd2 c1: 83 7b 24 02 cmpl $0x2,0x24(%ebx) c5: 74 02 je 0xc9 c7: 0f 0b ud2 c9: 89 ea mov %ebp,%edx cb: 89 d8 mov %ebx,%eax cd: e8 a8 fe ff ff call 0xffffff7a d2: f6 43 24 02 testb $0x2,0x24(%ebx) d6: 75 1f jne 0xf7 d8: 80 3d d4 ec 58 c1 01 cmpb $0x1,0xc158ecd4 df: 74 16 je 0xf7 e1: ba d9 04 00 00 mov $0x4d9,%edx e6: b8 0b 8e 35 c1 mov $0xc1358e0b,%eax eb: e8 1d 94 fe ff call 0xfffe950d f0: c6 05 d4 ec 58 c1 01 movb $0x1,0xc158ecd4 f7: 83 63 24 fd andl $0xfffffffd,0x24(%ebx) fb: 83 c4 08 add $0x8,%esp fe: 5b pop %ebx ff: 5e pop %esi 100: 5f pop %edi 101: 5d pop %ebp 102: c3 ret -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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