Hi Dave, On 04/06/2013 03:13 AM, Dave Hansen wrote: > Hey Thomas, > > I seem to be running in to smpboot_thread_fn()'s > > BUG_ON(td->cpu != smp_processor_id()); > > pretty regularly, both at boot and if I boot with maxcpus=x and then > online the CPUs from sysfs after boot. It's a 160-logical-cpu system, > so it's quite a beast. I _seem_ to be hitting it more often at higher > cpu counts, but it doesn't trigger on bringing up a particular CPU as > far as I can tell. > > This is on a pull of mainline from today, e0a77f263. Any ideas? >
Dave Jones had reported a similar problem some time back and Hillf had proposed a fix. I guess it slipped through the cracks and never went upstream. Here is the link: https://lkml.org/lkml/2013/1/19/1 Can you please try it and see if it improves anything? Regards, Srivatsa S. Bhat >> [ 790.223270] ------------[ cut here ]------------ >> [ 790.223966] kernel BUG at kernel/smpboot.c:134! >> [ 790.224739] invalid opcode: 0000 [#1] SMP >> [ 790.225671] Modules linked in: >> [ 790.226428] CPU 81 >> [ 790.226909] Pid: 3909, comm: migration/135 Tainted: G W >> 3.9.0-rc5-00184-gb6a9b7f-dirty #118 FUJITSU-SV PRIMEQUEST 1800E2/SB >> [ 790.228775] RIP: 0010:[<ffffffff8110bee8>] [<ffffffff8110bee8>] >> smpboot_thread_fn+0x258/0x280 >> [ 790.230205] RSP: 0018:ffff88bfef9c1e08 EFLAGS: 00010202 >> [ 790.231090] RAX: 0000000000000051 RBX: ffff88bfefb82000 RCX: >> 000000000000b888 >> [ 790.231653] RDX: ffff88bfef9c1fd8 RSI: ffff881fff000000 RDI: >> 0000000000000087 >> [ 790.232085] RBP: ffff88bfef9c1e38 R08: 0000000000000001 R09: >> 0000000000000000 >> [ 790.232850] R10: 0000000000000018 R11: 0000000000000000 R12: >> ffff88bfec9e22e0 >> [ 790.233561] R13: ffffffff81e587a0 R14: ffff88bfec9e22e0 R15: >> 0000000000000000 >> [ 790.234004] FS: 0000000000000000(0000) GS:ffff881fff000000(0000) >> knlGS:0000000000000000 >> [ 790.234918] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b >> [ 790.235602] CR2: 00007fa89a333c62 CR3: 0000000001e0b000 CR4: >> 00000000000007e0 >> [ 790.236110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: >> 0000000000000000 >> [ 790.236584] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: >> 0000000000000400 >> [ 790.237329] Process migration/135 (pid: 3909, threadinfo >> ffff88bfef9c0000, task ffff88bfec9e22e0) >> [ 790.238321] Stack: >> [ 790.238882] ffff88bfef9c1e38 0000000000000000 ffff88ffef421cc0 >> ffff88bfef9c1ec0 >> [ 790.245415] ffff88bfefb82000 ffffffff8110bc90 ffff88bfef9c1f48 >> ffffffff810ff1df >> [ 790.250755] 0000000000000001 0000000000000087 ffff88bfefb82000 >> 0000000000000000 >> [ 790.253365] Call Trace: >> [ 790.254121] [<ffffffff8110bc90>] ? __smpboot_create_thread+0x180/0x180 >> [ 790.255428] [<ffffffff810ff1df>] kthread+0xef/0x100 >> [ 790.256071] [<ffffffff819cb1a4>] ? wait_for_completion+0x124/0x180 >> [ 790.256697] [<ffffffff810ff0f0>] ? __init_kthread_worker+0x80/0x80 >> [ 790.257325] [<ffffffff819dba9c>] ret_from_fork+0x7c/0xb0 >> [ 790.258233] [<ffffffff810ff0f0>] ? __init_kthread_worker+0x80/0x80 >> [ 790.258942] Code: ef 3d 01 01 48 89 df e8 87 b0 16 00 48 83 05 67 ef 3d >> 01 01 48 83 c4 10 31 c0 5b 41 5c 41 5d 41 5e 5d c3 48 83 05 90 ef 3d 01 01 >> <0f> 0b 48 83 05 96 ef 3d 01 01 48 83 05 56 ef 3d 01 01 0f 0b 48 >> [ 790.276178] RIP [<ffffffff8110bee8>] smpboot_thread_fn+0x258/0x280 >> [ 790.276735] RSP <ffff88bfef9c1e08> >> [ 790.278348] ---[ end trace 84baa2bee1434240 ]--- > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
