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Date: Tue, 18 Mar 2014 17:10:37 -0400 (EDT) From: Vince Weaver <vincent.weaver@...ne.edu> To: Thomas Gleixner <tglx@...utronix.de> cc: Vince Weaver <vincent.weaver@...ne.edu>, linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com> Subject: Re: rb tree hrtimer lockup bug (found by perf_fuzzer) On Tue, 18 Mar 2014, Thomas Gleixner wrote: > > > [ 3.678040] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 > > [ 3.686776] IP: [<ffffffff8106d7a8>] get_next_timer_interrupt+0x168/0x250 > > The back trace is not really helpful. Is there anything before that > BUG in dmesg? no, just normal boot messages. I re-compiled with the frame pointer enabled and here's an updated version: [ 3.722836] sd 1:0:0:0: [sda] 4096-byte physical blocks [ 3.728682] sd 1:0:0:0: [sda] Write Protect is off [ 3.728826] sr 0:0:0:0: Attached scsi generic sg0 type 5 [ 3.728992] sd 1:0:0:0: Attached scsi generic sg1 type 0 [ 3.745700] sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 3.787096] sda: sda1 sda2 sda3 sda4 [ 3.792169] sd 1:0:0:0: [sda] Attached SCSI disk [ 4.312111] ------------[ cut here ]------------ [ 4.317176] kernel BUG at kernel/timer.c:1084! [ 4.322093] invalid opcode: 0000 [#1] SMP [ 4.326856] Modules linked in: sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common hid_generic usbhid hid ahci libahci ehci_pci libata e1000e xhci_hcd ehci_hcd ptp scsi_mod crc32c_intel usbcore pps_core usb_common fan thermal thermal_sys [ 4.352168] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.14.0-rc7 #3 [ 4.359034] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 [ 4.367138] task: ffff880118e989a0 ti: ffff880118e9e000 task.ti: ffff880118e9e000 [ 4.375353] RIP: 0010:[<ffffffff8106d073>] [<ffffffff8106d073>] cascade+0x93/0xa0 [ 4.383766] RSP: 0018:ffff88011ea43e78 EFLAGS: 00010086 [ 4.389555] RAX: 0000000000000000 RBX: ffff88011839de60 RCX: ffff880118ecdc28 [ 4.397324] RDX: 000000000000001f RSI: ffff8801183a8150 RDI: ffff880118ecc000 Begin: Loading essential drivers ... done. [ 4.405232] RBP: ffff88011ea43ea8 R08: ffe20047a9380000 R09: 0000000000000000 [ 4.414260] R10: 0000000000000004 R11: 0000000000000005 R12: ffff880118ecc000 Begin: Running /scripts/init-premount ... done. [ 4.423278] R13: ffff88011ea43e78 R14: 000000000000001f R15: ffffffff81876e10 [ 4.432348] FS: 0000000000000000(0000) GS:ffff88011ea40000(0000) knlGS:0000000000000000 [ 4.442441] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Begin: Mounting root file system ... [ 4.450013] CR2: 0000000000e762c8 CR3: 000000000180e000 CR4: 00000000001407e0 [ 4.459072] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 4.468156] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 4.477197] Stack: Begin: Running /scripts/local-top ... done. [ 4.480741] ffff8801183a8150 ffff88011839d460 ffff880118ecc0000000000000000000 Begin: Running /scripts/local-pre mount ... done. [ 4.495754] 0000000000000001 0000000000000100 ffff88011ea43f18 ffffffff8106e15c [ 4.504269] ffff880118ecdc28 ffff880118ecd828 ffff880118ecd428 ffff880118ecd028 [ 4.512741] Call Trace: [ 4.515466] <IRQ> [ 4.517617] [<ffffffff8106e15c>] run_timer_softirq+0x21c/0x2a0 [ 4.524524] [<ffffffff810c8716>] ? clockevents_program_event+0x66/0xe0 [ 4.531800] [<ffffffff81066c15>] __do_softirq+0xf5/0x290 [ 4.537734] [<ffffffff81066fdd>] irq_exit+0x9d/0xb0 [ 4.543211] [<ffffffff8104440f>] smp_apic_timer_interrupt+0x3f/0x50 [ 4.550147] [<ffffffff81545f9d>] apic_timer_interrupt+0x6d/0x80 [ 4.556729] <EOI> [ 4.558894] [<ffffffff81413ffd>] ? cpuidle_enter_state+0x4d/0xc0 [ 4.565969] [<ffffffff81414124>] cpuidle_idle_call+0xb4/0x1f0 [ 4.572381] [<ffffffff8101cfc9>] arch_cpu_idle+0x9/0x30 [ 4.578239] [<ffffffff810b4f05>] cpu_startup_entry+0x95/0x240 [ 4.584608] [<ffffffff810426f0>] start_secondary+0x1a0/0x1f0 [ 4.590924] Code: 49 39 cc 75 26 48 89 de 48 89 c3 4c 89 e7 e8 15 f7 ff ff 4c 39 eb 48 8b 03 75 dd 48 83 c4 10 44 89 f0 5b 41 5c 41 5d 41 5e 5d c3 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 55 31 c0 48 89 e5 41 56 [ 4.617262] RIP [<ffffffff8106d073>] cascade+0x93/0xa0 [ 4.623091] RSP <ffff88011ea43e78> [ 4.626976] ---[ end trace dd695d8667870673 ]--- [ 4.632059] Kernel panic - not syncing: Fatal exception in interrupt [ 4.639037] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff) Vince -- 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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