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Date: Thu, 8 Jul 2010 09:02:51 +0200 From: Ingo Molnar <mingo@...e.hu> To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com> Cc: linux-kernel@...r.kernel.org, Ma Ling <ling.ma@...el.com>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [BUG -tip bisected] x86, mem: Optimize memcpy by avoiding memory false dependece * Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote: > Hi Ingo, > > I just bisected the cause of boot hard lockup on my Intel Xeon E5405 to this > commit recently added to -tip: > > a1e5278e40f16a4611264f8da9e557c16cb6f6ed is the first bad commit > Merge branch 'x86/mem' > > Which merge: > > commit a1e5278e40f16a4611264f8da9e557c16cb6f6ed > x86, mem: Optimize memcpy by avoiding memory false dependece > > So maybe a revert while we wait for more thorough testing would be appropriate ? I am seeing some boot crashes too which indicate memory corruption. Didnt have time to bisect it but they started a day ago, just when i merged that new commit. I'll exclude it for the time being so that Ma Ling and Peter can investigate it. Below are two of the crash signatures, captured via a serial console. They both happen during general startup and indicate some sort of memory corruption. Athlon64 CPU. Thanks, Ingo [ 11.496000] EXT3-fs (sda6): mounted filesystem with writeback data mode [ 11.504000] VFS: Mounted root (ext3 filesystem) readonly on device 8:6. [ 11.508000] async_waiting @ 1 [ 11.512000] async_continuing @ 1 after 0 usec [ 11.516000] Freeing unused kernel memory: 512k freed [ 11.520000] BUG: unable to handle kernel paging request at ffffea0000063e31 [ 11.524000] IP: [<ffffffff810286e9>] free_init_pages+0x149/0x1c0 [ 11.524000] PGD 26b3067 PUD f050f000081a4 [ 11.524000] Oops: 0002 [#1] PREEMPT SMP [ 11.524000] last sysfs file: [ 11.524000] CPU 1 [ 11.524000] Modules linked in: [ 11.524000] [ 11.524000] Pid: 1, comm: swapper Not tainted 2.6.35-rc4-tip-01099-g2cf4496-dirty #15891 A8N-E/System Product Name [ 11.524000] RIP: 0010:[<ffffffff810286e9>] [<ffffffff810286e9>] free_init_pages+0x149/0x1c0 [ 11.524000] RSP: 0018:ffff88003f83dec0 EFLAGS: 00010286 [ 11.524000] RAX: ffffea0000063e30 RBX: ffffffff81d0a000 RCX: 00000000ffffffff [ 11.524000] RDX: 000000000000e450 RSI: 0000000000000046 RDI: ffffffff81c8a000 [ 11.524000] RBP: ffff88003f83def0 R08: 00000000ffffffff R09: 0000000000000000 [ 11.524000] R10: 0000000000000000 R11: 0000000000000002 R12: ffffffff81c8a000 [ 11.524000] R13: ffffea0000000000 R14: cccccccccccccccc R15: ffffffff81d0a000 [ 11.524000] FS: 0000000000000000(0000) GS:ffff880002100000(0000) knlGS:0000000000000000 [ 11.524000] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 11.524000] CR2: ffffea0000063e31 CR3: 0000000001bf8000 CR4: 00000000000006e0 [ 11.524000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 11.524000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 11.524000] Process swapper (pid: 1, threadinfo ffff88003f83c000, task ffff88003f848000) [ 11.524000] Stack: [ 11.524000] ffffffff81cf8a80 ffffffff81cf8a80 ffffffff81c85488 0000000000000008 [ 11.524000] <0> 0000000000000008 0000000000000000 ffff88003f83df00 ffffffff810287b3 [ 11.524000] <0> ffff88003f83df10 ffffffff81000393 ffff88003f83df40 ffffffff81c9f7bf [ 11.524000] Call Trace: [ 11.524000] [<ffffffff810287b3>] free_initmem+0x23/0x30 [ 11.524000] [<ffffffff81000393>] init_post+0x13/0xe0 [ 11.524000] [<ffffffff81c9f7bf>] kernel_init+0x1d0/0x1db [ 11.524000] [<ffffffff81003ea4>] kernel_thread_helper+0x4/0x10 [ 11.524000] [<ffffffff8185e981>] ? restore_args+0x0/0x30 [ 11.524000] [<ffffffff81c9f5ef>] ? kernel_init+0x0/0x1db [ 11.524000] [<ffffffff81003ea0>] ? kernel_thread_helper+0x0/0x10 [ 11.524000] Code: db c5 00 01 4c 39 e3 0f 86 26 ff ff ff 4c 89 e7 e8 1d 53 00 00 48 c1 e8 0c 48 8d 14 c5 00 00 00 00 48 c1 e0 06 48 29 d0 4c 01 e8 <f0> 80 60 01 fb 4c 89 e7 e8 fa 52 00 00 48 c1 e8 0c 4c 89 e7 48 [ 11.524000] RIP [<ffffffff810286e9>] free_init_pages+0x149/0x1c0 [ 14.500850] VFS: Mounted root (ext3 filesystem) readonly on device 8:6. [ 14.507555] async_waiting @ 1 [ 14.510574] async_continuing @ 1 after 2 usec [ 14.514986] Freeing unused kernel memory: 544k freed [ 14.743730] BUG: unable to handle kernel paging request at ffffea00000b6d20 [ 14.747017] IP: [<ffffffff81149540>] mpage_end_io_read+0x30/0x90 [ 14.747017] PGD 343d067 PUD 2e3c4ce88301246c [ 14.747017] Oops: 0002 [#1] [ 14.747017] last sysfs file: [ 14.747017] CPU 0 [ 14.747017] Modules linked in: [ 14.747017] [ 14.747017] Pid: 0, comm: swapper Not tainted 2.6.35-rc4-tip-01145-g7d54b7e-dirty #15956 A8N-E/System Product Name [ 14.747017] RIP: 0010:[<ffffffff81149540>] [<ffffffff81149540>] mpage_end_io_read+0x30/0x90 [ 14.747017] RSP: 0000:ffffffff81d62c70 EFLAGS: 00010202 [ 14.747017] RAX: ffffea00000b6d58 RBX: ffff88003e5960e0 RCX: 0000000000000080 [ 14.747017] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffea00000b6d20 [ 14.747017] RBP: ffffffff81d62c90 R08: 0000000000000001 R09: 0000000000000001 [ 14.747017] R10: ffff88003e5e2c18 R11: 0000000000000000 R12: ffff88003e5c1a80 [ 14.747017] R13: 0000000000000001 R14: 0000000000010000 R15: 0000000000000000 [ 14.747017] FS: 00007f4565040780(0000) GS:ffffffff81d5f000(0000) knlGS:0000000000000000 [ 14.747017] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 14.747017] CR2: ffffea00000b6d20 CR3: 000000003e5c0000 CR4: 00000000000006f0 [ 14.747017] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 14.747017] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 14.747017] Process swapper (pid: 0, threadinfo ffffffff81d40000, task ffffffff81d54040) [ 14.747017] Stack: [ 14.747017] ffffffff81d54040 ffff88003e5c1a80 ffff88003e5e2c18 0000000000000000 [ 14.747017] <0> ffffffff81d62ca0 ffffffff81143977 ffffffff81d62cd0 ffffffff81367b6b [ 14.747017] <0> 0000000000000000 0000000000000000 ffff88003e5c1a80 0000000000010000 [ 14.747017] Call Trace: [ 14.747017] <IRQ> [ 14.747017] [<ffffffff81143977>] bio_endio+0x17/0x30 [ 14.747017] [<ffffffff81367b6b>] req_bio_endio+0xab/0x110 [ 14.747017] [<ffffffff813690b4>] blk_update_request+0x104/0x4b0 [ 14.747017] [<ffffffff81369289>] ? blk_update_request+0x2d9/0x4b0 [ 14.747017] [<ffffffff81369482>] blk_update_bidi_request+0x22/0x80 [ 14.747017] [<ffffffff81369aba>] blk_end_bidi_request+0x2a/0x80 [ 14.747017] [<ffffffff81369b4b>] blk_end_request+0xb/0x10 [ 14.747017] [<ffffffff8147da9a>] scsi_io_completion+0xaa/0x5c0 [ 14.747017] [<ffffffff8147530d>] scsi_finish_command+0xbd/0x140 [ 14.747017] [<ffffffff8147e105>] scsi_softirq_done+0x145/0x170 [ 14.747017] [<ffffffff8136f3c5>] blk_done_softirq+0xa5/0xd0 [ 14.747017] [<ffffffff8104f9a1>] __do_softirq+0xb1/0x230 [ 14.747017] [<ffffffff81003e7a>] call_softirq+0x1a/0x30 [ 14.747017] [<ffffffff810052ad>] do_softirq+0x8d/0x100 [ 14.747017] [<ffffffff8104f535>] irq_exit+0x85/0x90 [ 14.747017] [<ffffffff81004cbe>] do_IRQ+0x5e/0xd0 [ 14.747017] [<ffffffff818e7253>] ret_from_intr+0x0/0x15 [ 14.747017] <EOI> [ 14.747017] [<ffffffff81024486>] ? native_safe_halt+0x6/0x10 [ 14.747017] [<ffffffff8107cadd>] ? trace_hardirqs_on+0xd/0x10 [ 14.747017] [<ffffffff8100ae33>] default_idle+0x43/0xb0 [ 14.747017] [<ffffffff81001fab>] cpu_idle+0x5b/0xf0 [ 14.747017] [<ffffffff818b099c>] rest_init+0xac/0xc0 [ 14.747017] [<ffffffff818b08f0>] ? rest_init+0x0/0xc0 [ 14.747017] [<ffffffff81fd9c88>] start_kernel+0x366/0x371 [ 14.747017] [<ffffffff81fd92ef>] x86_64_start_reservations+0xf6/0xfa [ 14.747017] [<ffffffff81fd9441>] x86_64_start_kernel+0x14e/0x15d [ 14.747017] Code: 55 41 54 49 89 fc 53 48 83 ec 08 0f b7 57 28 4c 8b 6f 18 48 8b 47 48 41 83 e5 01 48 c1 e2 04 48 8d 5c 02 f0 eb 17 0f 1f 44 00 00 <80> 0f 08 e8 78 02 f9 ff 49 8b 44 24 48 48 39 c3 72 2c 48 8b 3b [ 14.747017] RIP [<ffffffff81149540>] mpage_end_io_read+0x30/0x90 -- 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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