On Thu, Nov 21, 2013 at 9:22 AM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote: > On Thu, Nov 21, 2013 at 7:03 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: >>> >>> This one seems fix NULL reference in compute_group_power. >>> >>> but get following on current Linus tree plus tip/sched/urgent. >>> >>> divide error: 0000 [#1] SMP >>> [ 28.190477] Modules linked in: >>> [ 28.192012] CPU: 11 PID: 484 Comm: kworker/u324:0 Not tainted >>> 3.12.0-yh-10487-g4b94e59-dirty #2044 >>> [ 28.210488] Hardware name: Oracle Corporation Sun Fire >>> [ 28.229877] task: ffff88ff25205140 ti: ffff88ff2520a000 task.ti: >>> ffff88ff2520a000 >>> [ 28.236139] RIP: 0010:[<ffffffff810d9ff4>] [<ffffffff810d9ff4>] >>> find_busiest_group+0x2b4/0x8a0 >> >> Hurmph.. what kind of hardware is that? and is there anything funny you >> do to make it do this? > > intel nehanem-ex or westmere-ex 8 sockets system. > > I tried without my local patches, the problem is still there. original one in linus's tree: [ 8.952728] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter. [ 8.965697] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 [ 8.969495] IP: [<ffffffff810d7b53>] update_group_power+0x1d3/0x250 [ 8.987159] PGD 0 [ 8.989280] Oops: 0000 [#1] SMP [ 8.991686] Modules linked in: [ 8.993803] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-yh-02845-g527d151 #2048 [ 9.009175] Hardware name: Oracle Corporation Sun Fire X4800 M2 / , BIOS 15013200 04/19/2012 [ 9.028433] task: ffff883f24e28000 ti: ffff883f24e24000 task.ti: ffff883f24e24000 [ 9.033249] RIP: 0010:[<ffffffff810d7b53>] [<ffffffff810d7b53>] update_group_power+0x1d3/0x250 [ 9.051193] RSP: 0000:ffff883f24e25d68 EFLAGS: 00010283 [ 9.068162] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 [ 9.071838] RDX: 0000000000000000 RSI: 00000000000000a0 RDI: 00000000000000a0 [ 9.090260] RBP: ffff883f24e25d98 R08: ffff88ffc4891020 R09: 0000000000000000 [ 9.107870] R10: ffff88ffc4890818 R11: 0000000000000001 R12: 00000000001d40c0 [ 9.111527] R13: ffff88ffc4891018 R14: ffff88ffc4891000 R15: 0000000000000000 [ 9.131279] FS: 0000000000000000(0000) GS:ffff883f7d600000(0000) knlGS:0000000000000000 [ 9.148870] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 9.151914] CR2: 0000000000000010 CR3: 0000000002c14000 CR4: 00000000000007f0 [ 9.168645] Stack: [ 9.169871] ffff883f24e25d88 ffff88ffc4891000 ffff88ffc4870000 0000000000000001 [ 9.188660] 0000000000000001 ffff883f23b0d400 ffff883f24e25e58 ffffffff810ce094 [ 9.193232] ffff883f24e25dd8 0000000000000246 0000000000000003 ffffffff000000a0 [ 9.210992] Call Trace: [ 9.212524] [<ffffffff810ce094>] build_sched_domains+0x6f4/0x980 [ 9.229900] [<ffffffff83042a2b>] sched_init_smp+0x95/0x146 [ 9.233236] [<ffffffff83023023>] kernel_init_freeable+0x148/0x259 [ 9.250019] [<ffffffff82121bce>] ? kernel_init+0xe/0x130 [ 9.253356] [<ffffffff82121bc0>] ? rest_init+0xd0/0xd0 [ 9.268882] [<ffffffff82121bce>] kernel_init+0xe/0x130 [ 9.271661] [<ffffffff8215176c>] ret_from_fork+0x7c/0xb0 [ 9.288882] [<ffffffff82121bc0>] ? rest_init+0xd0/0xd0 [ 9.292476] Code: ff 31 db b8 ff ff ff ff 4d 8d 6e 18 eb 31 66 2e 0f 1f 84 00 00 00 00 00 48 63 d0 48 8b 14 d5 40 c4 e2 82 49 8b 94 14 08 09 00 00 <48> 8b 52 10 48 8b 52 10 8b 4a 08 8b 52 04 49 01 cf 48 01 d3 83 [ 9.335669] RIP [<ffffffff810d7b53>] update_group_power+0x1d3/0x250 [ 9.348090] RSP <ffff883f24e25d68> [ 9.350240] CR2: 0000000000000010 [ 9.351803] ---[ end trace a21cca9ad6b48d40 ]--- [ 9.367839] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 9.367839] -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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