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Date: Thu, 17 Mar 2016 13:54:36 -0400 From: Josh Boyer <jwboyer@...oraproject.org> To: Thomas Gleixner <tglx@...utronix.de>, "Richard W.M. Jones" <rjones@...hat.com> Cc: x86 <x86@...nel.org>, "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org> Subject: Oops from calibrate_delay_is_known on qemu machine with Linux v4.5-1523-g271ecc5253e2 Hi Thomas, We've had a report [1] of the mainline kernel crashing on a single-cpu QEMU machine (not kvm) in Fedora. It looks as if the emulated machine is failing to provide a TSC and the calibrate_delay_is_known function is passing NULL to cpumask_any_but for the mask parameter. At least that's all I've been able to discern thus far. I was wondering if you had any insight into this issue, given your recent commit to change calibrate_delay_is_known to use topology_core_cpumask. The backtrace is below. josh [1] https://bugzilla.redhat.com/show_bug.cgi?id=1318596 \x1b[2J[ 0.000000] Linux version 4.6.0-0.rc0.git5.1.fc25.x86_64 (mockbuild@...rnel01.phx2.fedoraproject.org) (gcc version 6.0.0 20160311 (Red Hat 6.0.0-0.16) (GCC) ) #1 SMP Wed Mar 16 23:42:51 UTC 2016 [ 0.000000] Command line: panic=1 console=ttyS0 udevtimeout=6000 udev.event-timeout=6000 no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=vt100 [ 0.000000] x86/fpu: Legacy x87 FPU detected. [ 0.000000] x86/fpu: Using 'eager' FPU context switches. [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009f7ff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009f800-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001f3fbfff] usable [ 0.000000] BIOS-e820: [mem 0x000000001f3fc000-0x000000001f3fffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] SMBIOS 2.8 present. [ 0.000000] e820: last_pfn = 0x1f3fc max_arch_pfn = 0x400000000 [ 0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT [ 0.000000] found SMP MP-table at [mem 0x000f6bb0-0x000f6bbf] mapped at [ffff8800000f6bb0] [ 0.000000] Scanning 1 areas for low memory corruption [ 0.000000] RAMDISK: [mem 0x1f200000-0x1f3effff] [ 0.000000] No NUMA configuration found [ 0.000000] Faking a node at [mem 0x0000000000000000-0x000000001f3fbfff] [ 0.000000] NODE_DATA(0) allocated [mem 0x1f1e9000-0x1f1fffff] [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000000001000-0x0000000000ffffff] [ 0.000000] DMA32 [mem 0x0000000001000000-0x000000001f3fbfff] [ 0.000000] Normal empty [ 0.000000] Device empty [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000000001000-0x000000000009efff] [ 0.000000] node 0: [mem 0x0000000000100000-0x000000001f3fbfff] [ 0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000001f3fbfff] [ 0.000000] SFI: Simple Firmware Interface v0.81 http://simplefirmware.org [ 0.000000] Intel MultiProcessor Specification v1.4 [ 0.000000] MPTABLE: OEM ID: BOCHSCPU [ 0.000000] MPTABLE: Product ID: 0.1 [ 0.000000] MPTABLE: APIC at: 0xFEE00000 [ 0.000000] Processor #0 (Bootup-CPU) [ 0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23 [ 0.000000] Processors: 1 [ 0.000000] smpboot: Allowing 1 CPUs, 0 hotplug CPUs [ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff] [ 0.000000] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff] [ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000effff] [ 0.000000] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff] [ 0.000000] e820: [mem 0x1f400000-0xfffbffff] available for PCI devices [ 0.000000] Booting paravirtualized kernel on bare hardware [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns [ 0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:1 nr_cpu_ids:1 nr_node_ids:1 [ 0.000000] PERCPU: Embedded 483 pages/cpu @ffff88001ee00000 s1937688 r8192 d32488 u2097152 [ 0.000000] Built 1 zonelists in Node order, mobility grouping on. Total pages: 125877 [ 0.000000] Policy zone: DMA32 [ 0.000000] Kernel command line: panic=1 console=ttyS0 udevtimeout=6000 udev.event-timeout=6000 no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=vt100 [ 0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes) [ 0.000000] Memory: 461856K/511592K available (8982K kernel code, 1793K rwdata, 3488K rodata, 3700K init, 16816K bss, 49736K reserved, 0K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] Running RCU self tests [ 0.000000] Hierarchical RCU implementation. [ 0.000000] \tRCU lockdep checking is enabled. [ 0.000000] \tBuild-time adjustment of leaf fanout to 64. [ 0.000000] \tRCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=1. [ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=1 [ 0.000000] kmemleak: Kernel memory leak detector disabled [ 0.000000] NR_IRQS:524544 nr_irqs:256 16 [ 0.000000] \tOffload RCU callbacks from all CPUs [ 0.000000] \tOffload RCU callbacks from CPUs: 0. [ 0.000000] Console: colour *CGA 80x25 [ 0.000000] console [ttyS0] enabled [ 0.000000] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar [ 0.000000] ... MAX_LOCKDEP_SUBCLASSES: 8 [ 0.000000] ... MAX_LOCK_DEPTH: 48 [ 0.000000] ... MAX_LOCKDEP_KEYS: 8191 [ 0.000000] ... CLASSHASH_SIZE: 4096 [ 0.000000] ... MAX_LOCKDEP_ENTRIES: 32768 [ 0.000000] ... MAX_LOCKDEP_CHAINS: 65536 [ 0.000000] ... CHAINHASH_SIZE: 32768 [ 0.000000] memory used by lock dependency info: 8671 kB [ 0.000000] per task-struct memory footprint: 2688 bytes [ 0.000000] tsc: Unable to calibrate against PIT [ 0.000000] tsc: No reference (HPET/PMTIMER) available [ 0.000000] tsc: Marking TSC unstable due to could not calculate TSC khz [ 0.010000] BUG: unable to handle kernel NULL pointer dereference at (null) [ 0.010000] IP: [<ffffffff814698b5>] _find_next_bit.part.0+0x15/0x70 [ 0.010000] PGD 0 [ 0.010000] Oops: 0000 [#1] SMP [ 0.010000] Modules linked in: [ 0.010000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.6.0-0.rc0.git5.1.fc25.x86_64 #1 [ 0.010000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.0-2.fc24 04/01/2014 [ 0.010000] task: ffffffff81e0d580 ti: ffffffff81e00000 task.ti: ffffffff81e00000 [ 0.010000] RIP: 0010:[<ffffffff814698b5>] [<ffffffff814698b5>] _find_next_bit.part.0+0x15/0x70 [ 0.010000] RSP: 0000:ffffffff81e03e40 EFLAGS: 00000246 [ 0.010000] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 0.010000] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 0.010000] RBP: ffffffff81e03e50 R08: ffffffffffffffff R09: 0000000000000000 [ 0.010000] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 0.010000] R13: ffffffff82248960 R14: ffffffff822562e0 R15: 0000000000000000 [ 0.010000] FS: 0000000000000000(0000) GS:ffff88001ee00000(0000) knlGS:0000000000000000 [ 0.010000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.010000] CR2: 0000000000000000 CR3: 0000000001e06000 CR4: 00000000000006b0 [ 0.010000] Stack: [ 0.010000] ffffffff81e03e50 ffffffff81469928 ffffffff81e03e70 ffffffff81453d56 [ 0.010000] 0000000000000000 ffff88001f3fa780 ffffffff81e03e80 ffffffff81040495 [ 0.010000] ffffffff81e03f40 ffffffff8100285a ffffffff810eefb3 ffffffff00000000 [ 0.010000] Call Trace: [ 0.010000] [<ffffffff81469928>] ? find_next_bit+0x18/0x20 [ 0.010000] [<ffffffff81453d56>] cpumask_any_but+0x26/0x50 [ 0.010000] [<ffffffff81040495>] calibrate_delay_is_known+0x45/0x80 [ 0.010000] [<ffffffff8100285a>] calibrate_delay+0xfa/0x690 [ 0.010000] [<ffffffff810eefb3>] ? sched_clock_init+0x13/0x90 [ 0.010000] [<ffffffff81111525>] ? trace_hardirqs_on_caller+0xf5/0x1b0 [ 0.010000] [<ffffffff81146743>] ? ktime_get+0xb3/0x150 [ 0.010000] [<ffffffff810eefb3>] ? sched_clock_init+0x13/0x90 [ 0.010000] [<ffffffff8219cf7a>] start_kernel+0x3db/0x4a3 [ 0.010000] [<ffffffff8219c120>] ? early_idt_handler_array+0x120/0x120 [ 0.010000] [<ffffffff8219c32c>] x86_64_start_reservations+0x2a/0x2c [ 0.010000] [<ffffffff8219c47a>] x86_64_start_kernel+0x14c/0x16f [ 0.010000] Code: d0 48 0f 47 c2 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 c8 48 89 d1 49 c7 c0 ff ff ff ff 48 c1 e9 06 49 89 c1 55 <4c> 33 0c cf 89 d1 48 83 e2 c0 49 d3 e0 48 89 e5 4c 89 c1 4c 21 [ 0.010000] RIP [<ffffffff814698b5>] _find_next_bit.part.0+0x15/0x70 [ 0.010000] RSP <ffffffff81e03e40> [ 0.010000] CR2: 0000000000000000 [ 0.010000] ---[ end trace 1f7208cba1f1b54f ]--- [ 0.010000] Kernel panic - not syncing: Attempted to kill the idle task!
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