Re: [PATCH][GIT PULL] tracing: Fix compile issue fortrace_sched_wakeup.c

From: Peter Zijlstra
Date: Mon Oct 25 2010 - 12:09:45 EST

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@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/