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Date: Thu, 3 Sep 2009 20:17:43 +0200 From: Ingo Molnar <mingo@...e.hu> To: Thomas Gleixner <tglx@...utronix.de> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>, mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org, johnstul@...ibm.com, linux-tip-commits@...r.kernel.org Subject: [boot crash] Re: [tip:timers/core] clocksource: Resolve cpu hotplug dead lock with TSC unstable -tip testing found the following boot crash on a 64-bit x86 system: [ 0.405247] initcall spawn_softlockup_task+0x0/0xa5 returned 0 after 0 usecs [ 0.410004] calling relay_init+0x0/0x40 @ 1 [ 0.420005] initcall relay_init+0x0/0x40 returned 0 after 0 usecs [ 0.426355] lockdep: fixing up alternatives. [ 0.430110] Booting processor 1 APIC 0x1 ip 0x6000 [ 0.030000] Initializing CPU#1 [ 0.030000] masked ExtINT on CPU#1 [ 0.520060] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 [ 0.530000] IP: [<ffffffff81071317>] queue_work_on+0x27/0x70 [ 0.530000] PGD 0 [ 0.530000] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 0.530000] last sysfs file: [ 0.530000] CPU 0 [ 0.530000] Modules linked in: [ 0.530000] Pid: 1, comm: swapper Not tainted 2.6.31-rc8-tip #1613 [ 0.530000] RIP: 0010:[<ffffffff81071317>] [<ffffffff81071317>] queue_work_on+0x27/0x70 [ 0.530000] RSP: 0018:ffff880009007d40 EFLAGS: 00010246 [ 0.530000] RAX: 0000000000000000 RBX: ffffffff81e1d0c0 RCX: 0000000000000000 [ 0.530000] RDX: ffffffff824a1fa0 RSI: 0000000000000000 RDI: 0000000000000000 [ 0.530000] RBP: ffff880009007d50 R08: 0000000000000000 R09: 0000000000000000 [ 0.530000] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000025cb39a8 [ 0.530000] R13: ffffffff824a0c40 R14: ffff880009007e50 R15: 0000000000000100 [ 0.530000] FS: 0000000000000000(0000) GS:ffff880009004000(0000) knlGS:0000000000000000 [ 0.530000] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b [ 0.530000] CR2: 0000000000000020 CR3: 0000000001001000 CR4: 00000000000006b0 [ 0.530000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 0.530000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 0.530000] Process swapper (pid: 1, threadinfo ffff88003f0da000, task ffff88003f0e0000) [ 0.530000] Stack: [ 0.530000] ffffffff824a0c40 00000000b4b7426a ffff880009007d70 ffffffff8107157d [ 0.530000] <0> ffffffff81083846 00000000b4b7426a ffff880009007d90 ffffffff810715c9 [ 0.530000] <0> 0000000000000000 00000000b4b7426a ffff880009007dc0 ffffffff81083927 [ 0.530000] Call Trace: [ 0.530000] <IRQ> [ 0.530000] [<ffffffff8107157d>] queue_work+0x2d/0x50 [ 0.530000] [<ffffffff81083846>] ? clocksource_watchdog+0x26/0x240 [ 0.530000] [<ffffffff810715c9>] schedule_work+0x29/0x50 [ 0.530000] [<ffffffff81083927>] clocksource_watchdog+0x107/0x240 [ 0.530000] [<ffffffff81065eee>] run_timer_softirq+0x21e/0x380 [ 0.530000] [<ffffffff81065e29>] ? run_timer_softirq+0x159/0x380 [ 0.530000] [<ffffffff81083820>] ? clocksource_watchdog+0x0/0x240 [ 0.530000] [<ffffffff810600aa>] __do_softirq+0x10a/0x200 [ 0.530000] [<ffffffff8100cb1c>] call_softirq+0x1c/0x90 [ 0.530000] [<ffffffff8100e955>] do_softirq+0x95/0xc0 [ 0.530000] [<ffffffff8105f4c5>] irq_exit+0x75/0x90 [ 0.530000] [<ffffffff81029c20>] smp_apic_timer_interrupt+0x80/0xd0 [ 0.530000] [<ffffffff8100c4f3>] apic_timer_interrupt+0x13/0x20 [ 0.530000] <EOI> [ 0.530000] [<ffffffff812ff997>] ? delay_tsc+0x47/0x80 [ 0.530000] [<ffffffff812ffab4>] ? __const_udelay+0x64/0x80 [ 0.530000] [<ffffffff818b3fff>] ? do_boot_cpu+0x498/0x6b3 [ 0.530000] [<ffffffff818b4567>] ? do_fork_idle+0x0/0x56 [ 0.530000] [<ffffffff810468d2>] ? complete+0x32/0x80 [ 0.530000] [<ffffffff818b4375>] ? native_cpu_up+0x15b/0x208 [ 0.530000] [<ffffffff818b69d8>] ? _cpu_up+0xf3/0x1a4 [ 0.530000] [<ffffffff818b6b4d>] ? cpu_up+0xc4/0xd7 [ 0.530000] [<ffffffff821d3f97>] ? smp_init+0x118/0x126 [ 0.530000] [<ffffffff821d40c7>] ? kernel_init+0x82/0xec [ 0.530000] [<ffffffff8100ca1a>] ? child_rip+0xa/0x20 [ 0.530000] [<ffffffff8100c3bc>] ? restore_args+0x0/0x30 [ 0.530000] [<ffffffff821d4045>] ? kernel_init+0x0/0xec [ 0.530000] [<ffffffff8100ca10>] ? child_rip+0x0/0x20 [ 0.530000] Code: ff 0f 1f 00 55 41 89 f8 48 89 e5 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 45 f8 31 c0 f0 0f ba 2a 00 19 c0 31 c9 85 c0 75 2a <44> 8b 4e 20 48 8b 3e 48 89 d6 45 85 c9 44 0f 45 05 b4 f4 f7 00 [ 0.530000] RIP [<ffffffff81071317>] queue_work_on+0x27/0x70 [ 0.530000] RSP <ffff880009007d40> [ 0.530000] CR2: 0000000000000020 [ 0.530006] ---[ end trace a7919e7f17c0a725 ]--- [ 0.540001] Kernel panic - not syncing: Fatal exception in interrupt Config and full bootlog attached. Note, i have other systems that do not trigger this crash, so it's something specific to this one. It has an hpet for example: [ 0.000000] ACPI: HPET 000000003fef7e90 00038 (v01 INTEL D975XBX 000004B9 MSFT 01000013) [ 0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000 [ 0.000000] hpet clockevent registered i tried to bisect it but it's inconclusive: # bad: [32beef9c] Merge branch 'perfcounters/core' # bad: [b6413360] manual merge of x86/platform # bad: [d9e5f39a] Merge branch 'auto-oprofile-next' into auto-latest # bad: [cbaff272] Merge branch 'auto-timers-next' into auto-latest as the bisection comes up with that merge commit. Perhaps the combination of the x86/platform changes and the clocksource changes triggered it? Ingo View attachment "config" of type "text/plain" (59561 bytes) View attachment "crash.log" of type "text/plain" (24131 bytes)
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