Re: BUG on 3.0-rc on commitd72bce0e67e8afc6eb959f656013cbb577426f1e
From: Andrew Theurer
Date: Mon Jun 13 2011 - 11:06:54 EST
On Fri, 2011-06-10 at 18:27 +0200, Peter Zijlstra wrote:
> On Fri, 2011-06-10 at 10:34 -0500, Andrew Theurer wrote:
> > RIP: 0010:[<ffffffff8104e8c1>] [<ffffffff8104e8c1>] find_lowest_rq+0xa1/0x150
>
> If you've still got the vmlinux around, could you find out where in
> find_lowest_rq that RIP is?
Does this help?
from objdump -d -S
ffffffff8104e820 <find_lowest_rq>:
ffffffff8104e820: 55 push %rbp
ffffffff8104e821: 48 89 e5 mov %rsp,%rbp
ffffffff8104e824: 48 83 ec 30 sub $0x30,%rsp
ffffffff8104e828: 48 89 5d d8 mov %rbx,-0x28(%rbp)
ffffffff8104e82c: 4c 89 65 e0 mov %r12,-0x20(%rbp)
ffffffff8104e830: 4c 89 6d e8 mov %r13,-0x18(%rbp)
ffffffff8104e834: 4c 89 75 f0 mov %r14,-0x10(%rbp)
ffffffff8104e838: 4c 89 7d f8 mov %r15,-0x8(%rbp)
ffffffff8104e83c: e8 3f bf 48 00 callq ffffffff814da780 <mcount>
ffffffff8104e841: 48 c7 c0 88 e8 00 00 mov $0xe888,%rax
ffffffff8104e848: 65 48 03 04 25 50 dc add %gs:0xdc50,%rax
ffffffff8104e84f: 00 00
ffffffff8104e851: 65 44 8b 2c 25 58 dc mov %gs:0xdc58,%r13d
ffffffff8104e858: 00 00
ffffffff8104e85a: 83 bf bc 01 00 00 01 cmpl $0x1,0x1bc(%rdi)
ffffffff8104e861: 4c 8b 20 mov (%rax),%r12
ffffffff8104e864: 48 8b 47 08 mov 0x8(%rdi),%rax
ffffffff8104e868: 8b 58 18 mov 0x18(%rax),%ebx
ffffffff8104e86b: 75 23 jne ffffffff8104e890 <find_lowest_rq+0x70>
ffffffff8104e86d: b8 ff ff ff ff mov $0xffffffff,%eax
ffffffff8104e872: 48 8b 5d d8 mov -0x28(%rbp),%rbx
ffffffff8104e876: 4c 8b 65 e0 mov -0x20(%rbp),%r12
ffffffff8104e87a: 4c 8b 6d e8 mov -0x18(%rbp),%r13
ffffffff8104e87e: 4c 8b 75 f0 mov -0x10(%rbp),%r14
ffffffff8104e882: 4c 8b 7d f8 mov -0x8(%rbp),%r15
ffffffff8104e886: c9 leaveq
ffffffff8104e887: c3 retq
ffffffff8104e888: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
ffffffff8104e88f: 00
ffffffff8104e890: 89 d8 mov %ebx,%eax
ffffffff8104e892: 49 c7 c7 c0 2a 01 00 mov $0x12ac0,%r15
ffffffff8104e899: 48 89 fe mov %rdi,%rsi
ffffffff8104e89c: 48 8b 04 c5 40 a3 bf mov -0x7e405cc0(,%rax,8),%rax
ffffffff8104e8a3: 81
ffffffff8104e8a4: 4c 89 e2 mov %r12,%rdx
ffffffff8104e8a7: 49 8b 84 07 88 08 00 mov 0x888(%r15,%rax,1),%rax
ffffffff8104e8ae: 00
ffffffff8104e8af: 48 83 c0 38 add $0x38,%rax
ffffffff8104e8b3: 48 89 c7 mov %rax,%rdi
ffffffff8104e8b6: e8 85 75 0a 00 callq ffffffff810f5e40 <cpupri_find>
ffffffff8104e8bb: 85 c0 test %eax,%eax
ffffffff8104e8bd: 74 ae je ffffffff8104e86d <find_lowest_rq+0x4d>
ffffffff8104e8bf: 89 d8 mov %ebx,%eax
ffffffff8104e8c1: 41 0f a3 1c 24 bt %ebx,(%r12)
ffffffff8104e8c6: 19 d2 sbb %edx,%edx
ffffffff8104e8c8: 85 d2 test %edx,%edx
ffffffff8104e8ca: 75 a6 jne ffffffff8104e872 <find_lowest_rq+0x52>
ffffffff8104e8cc: 45 0f a3 2c 24 bt %r13d,(%r12)
ffffffff8104e8d1: 19 c0 sbb %eax,%eax
ffffffff8104e8d3: 41 be ff ff ff ff mov $0xffffffff,%r14d
ffffffff8104e8d9: 85 c0 test %eax,%eax
ffffffff8104e8db: 48 63 db movslq %ebx,%rbx
ffffffff8104e8de: 45 0f 45 f5 cmovne %r13d,%r14d
ffffffff8104e8e2: 4c 03 3c dd 40 a3 bf add -0x7e405cc0(,%rbx,8),%r15
ffffffff8104e8e9: 81
ffffffff8104e8ea: 49 8b 9f 90 08 00 00 mov 0x890(%r15),%rbx
ffffffff8104e8f1: 48 85 db test %rbx,%rbx
ffffffff8104e8f4: 74 4c je ffffffff8104e942 <find_lowest_rq+0x122>
ffffffff8104e8f6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
ffffffff8104e8fd: 00 00 00
ffffffff8104e900: f6 43 4c 20 testb $0x20,0x4c(%rbx)
ffffffff8104e904: 74 34 je ffffffff8104e93a <find_lowest_rq+0x11a>
ffffffff8104e906: 41 83 fe ff cmp $0xffffffffffffffff,%r14d
ffffffff8104e90a: 74 0e je ffffffff8104e91a <find_lowest_rq+0xfa>
ffffffff8104e90c: 44 0f a3 b3 20 01 00 bt %r14d,0x120(%rbx)
ffffffff8104e913: 00
ffffffff8104e914: 19 c0 sbb %eax,%eax
ffffffff8104e916: 85 c0 test %eax,%eax
ffffffff8104e918: 75 2e jne ffffffff8104e948 <find_lowest_rq+0x128>
ffffffff8104e91a: 48 8d 93 20 01 00 00 lea 0x120(%rbx),%rdx
ffffffff8104e921: 4c 89 e6 mov %r12,%rsi
ffffffff8104e924: bf ff ff ff ff mov $0xffffffff,%edi
ffffffff8104e929: e8 42 4e 1e 00 callq ffffffff81233770 <cpumask_next_and>
ffffffff8104e92e: 3b 05 14 78 bb 00 cmp 0xbb7814(%rip),%eax # ffffffff81c06148 <nr_cpu_ids>
ffffffff8104e934: 0f 8c 38 ff ff ff jl ffffffff8104e872 <find_lowest_rq+0x52>
ffffffff8104e93a: 48 8b 1b mov (%rbx),%rbx
ffffffff8104e93d: 48 85 db test %rbx,%rbx
ffffffff8104e940: 75 be jne ffffffff8104e900 <find_lowest_rq+0xe0>
ffffffff8104e942: 41 83 fe ff cmp $0xffffffffffffffff,%r14d
ffffffff8104e946: 74 08 je ffffffff8104e950 <find_lowest_rq+0x130>
ffffffff8104e948: 44 89 f0 mov %r14d,%eax
ffffffff8104e94b: e9 22 ff ff ff jmpq ffffffff8104e872 <find_lowest_rq+0x52>
ffffffff8104e950: 48 63 35 f1 77 bb 00 movslq 0xbb77f1(%rip),%rsi # ffffffff81c06148 <nr_cpu_ids>
ffffffff8104e957: 4c 89 e7 mov %r12,%rdi
ffffffff8104e95a: e8 d1 52 1e 00 callq ffffffff81233c30 <find_first_bit>
ffffffff8104e95f: 3b 05 e3 77 bb 00 cmp 0xbb77e3(%rip),%eax # ffffffff81c06148 <nr_cpu_ids>
ffffffff8104e965: 0f 8c 07 ff ff ff jl ffffffff8104e872 <find_lowest_rq+0x52>
ffffffff8104e96b: e9 fd fe ff ff jmpq ffffffff8104e86d <find_lowest_rq+0x4d>
[ 4.540584] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
[ 4.548779] IP: [<ffffffff8104e8c1>] find_lowest_rq+0xa1/0x150
[ 4.554824] PGD 0
[ 4.557044] Oops: 0000 [#1] SMP
[ 4.560558] CPU 0
[ 4.562457] Modules linked in:
[ 4.566042]
[ 4.567669] Pid: 1, comm: swapper Not tainted 3.0.0-rc2-00251-g7f45e5c #37 IBM -[7145AC1]-/Node 1, Processor Card
[ 4.578446] RIP: 0010:[<ffffffff8104e8c1>] [<ffffffff8104e8c1>] find_lowest_rq+0xa1/0x150
[ 4.586988] RSP: 0018:ffff883732925ca0 EFLAGS: 00010002
[ 4.592429] RAX: 0000000000000020 RBX: 0000000000000020 RCX: 0000000000000050
[ 4.599692] RDX: 00000000ffffffff RSI: 0000000000000050 RDI: 0000000000000050
[ 4.606954] RBP: ffff883732925cd0 R08: ffff883732774d38 R09: 0000000000000000
[ 4.614219] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[ 4.621479] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000012ac0
[ 4.628739] FS: 0000000000000000(0000) GS:ffff88387f800000(0000) knlGS:0000000000000000
[ 4.637024] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 4.642897] CR2: 0000000000000004 CR3: 0000000001a03000 CR4: 00000000000006f0
[ 4.650159] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4.657421] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 4.664684] Process swapper (pid: 1, threadinfo ffff883732924000, task ffff8837329234c0)
[ 4.672971] Stack:
[ 4.675117] ffff883732925cf0 0000000000000020 0000000000000020 ffff883732775300
[ 4.683022] 0000000000000000 0000000000000286 ffff883732925cf0 ffffffff8104e9ea
[ 4.690938] ffff88373279cb00 ffff883732774b40 ffff883732925d40 ffffffff8105ac79
[ 4.698851] Call Trace:
[ 4.701437] [<ffffffff8104e9ea>] select_task_rq_rt+0x7a/0x90
[ 4.707320] [<ffffffff8105ac79>] try_to_wake_up+0x119/0x2a0
[ 4.713114] [<ffffffff8105ae55>] wake_up_process+0x15/0x20
[ 4.718818] [<ffffffff814cc546>] rcu_cpu_notify+0xd6/0x196
[ 4.724524] [<ffffffff814d65a5>] notifier_call_chain+0x55/0x80
[ 4.730577] [<ffffffff8108a7be>] __raw_notifier_call_chain+0xe/0x10
[ 4.737061] [<ffffffff81064590>] __cpu_notify+0x20/0x40
[ 4.742504] [<ffffffff814caf05>] _cpu_up+0xc7/0x10e
[ 4.747599] [<ffffffff814cb023>] cpu_up+0xd7/0xea
[ 4.752527] [<ffffffff81c41dfa>] smp_init+0x41/0x96
[ 4.757627] [<ffffffff81c227d4>] kernel_init+0x1d6/0x262
[ 4.763165] [<ffffffff814dbb84>] kernel_thread_helper+0x4/0x10
[ 4.769221] [<ffffffff81c225fe>] ? do_basic_setup+0x5c/0x5c
[ 4.775008] [<ffffffff814dbb80>] ? gs_change+0x13/0x13
[ 4.780360] Code: 2a 01 00 48 89 fe 48 8b 04 c5 40 a3 bf 81 4c 89 e2 49 8b 84 07 88 08 00 00 48 83 c0 38 48 89 c7 e8 85 75 0a 00 85 c0 74 ae 89 d8
[ 4.796927] 0f a3 1c 24 19 d2 85 d2 75 a6 45 0f a3 2c 24 19 c0 41 be ff
[ 4.805820] RIP [<ffffffff8104e8c1>] find_lowest_rq+0xa1/0x150
[ 4.811946] RSP <ffff883732925ca0>
[ 4.815566] CR2: 0000000000000004
[ 4.819019] ---[ end trace ca2ec1f2e8037d5f ]---
-Andrew
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