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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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20afc60f89
An event may occur when an mm is already released. I added an event in dequeue_entity() and caught a panic with the following backtrace: [ 434.421110] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 [ 434.421258] IP: [<ffffffff810464ac>] __get_user_pages_fast+0x9c/0x120 ... [ 434.421258] Call Trace: [ 434.421258] [<ffffffff8101ae81>] copy_from_user_nmi+0x51/0xf0 [ 434.421258] [<ffffffff8109a0d5>] ? sched_clock_local+0x25/0x90 [ 434.421258] [<ffffffff8101b048>] perf_callchain_user+0x128/0x170 [ 434.421258] [<ffffffff811154cd>] ? __perf_event_header__init_id+0xed/0x100 [ 434.421258] [<ffffffff81116690>] perf_prepare_sample+0x200/0x280 [ 434.421258] [<ffffffff81118da8>] __perf_event_overflow+0x1b8/0x290 [ 434.421258] [<ffffffff81065240>] ? tg_shares_up+0x0/0x670 [ 434.421258] [<ffffffff8104fe1a>] ? walk_tg_tree+0x6a/0xb0 [ 434.421258] [<ffffffff81118f44>] perf_swevent_overflow+0xc4/0xf0 [ 434.421258] [<ffffffff81119150>] do_perf_sw_event+0x1e0/0x250 [ 434.421258] [<ffffffff81119204>] perf_tp_event+0x44/0x70 [ 434.421258] [<ffffffff8105701f>] ftrace_profile_sched_block+0xdf/0x110 [ 434.421258] [<ffffffff8106121d>] dequeue_entity+0x2ad/0x2d0 [ 434.421258] [<ffffffff810614ec>] dequeue_task_fair+0x1c/0x60 [ 434.421258] [<ffffffff8105818a>] dequeue_task+0x9a/0xb0 [ 434.421258] [<ffffffff810581e2>] deactivate_task+0x42/0xe0 [ 434.421258] [<ffffffff814bc019>] thread_return+0x191/0x808 [ 434.421258] [<ffffffff81098a44>] ? switch_task_namespaces+0x24/0x60 [ 434.421258] [<ffffffff8106f4c4>] do_exit+0x464/0x910 [ 434.421258] [<ffffffff8106f9c8>] do_group_exit+0x58/0xd0 [ 434.421258] [<ffffffff8106fa57>] sys_exit_group+0x17/0x20 [ 434.421258] [<ffffffff8100b202>] system_call_fastpath+0x16/0x1b Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: stable@kernel.org Link: http://lkml.kernel.org/r/1314693156-24131-1-git-send-email-avagin@openvz.org Signed-off-by: Ingo Molnar <mingo@elte.hu> |
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.. | ||
acpi | ||
apic | ||
cpu | ||
.gitignore | ||
alternative.c | ||
amd_gart_64.c | ||
amd_nb.c | ||
apb_timer.c | ||
aperture_64.c | ||
apm_32.c | ||
asm-offsets_32.c | ||
asm-offsets_64.c | ||
asm-offsets.c | ||
audit_64.c | ||
bootflag.c | ||
check.c | ||
cpuid.c | ||
crash_dump_32.c | ||
crash_dump_64.c | ||
crash.c | ||
devicetree.c | ||
doublefault_32.c | ||
dumpstack_32.c | ||
dumpstack_64.c | ||
dumpstack.c | ||
e820.c | ||
early_printk.c | ||
early-quirks.c | ||
entry_32.S | ||
entry_64.S | ||
ftrace.c | ||
head32.c | ||
head64.c | ||
head_32.S | ||
head_64.S | ||
head.c | ||
hpet.c | ||
hw_breakpoint.c | ||
i386_ksyms_32.c | ||
i387.c | ||
i8237.c | ||
i8253.c | ||
i8259.c | ||
init_task.c | ||
io_delay.c | ||
ioport.c | ||
irq_32.c | ||
irq_64.c | ||
irq_work.c | ||
irq.c | ||
irqinit.c | ||
jump_label.c | ||
kdebugfs.c | ||
kgdb.c | ||
kprobes.c | ||
kvm.c | ||
kvmclock.c | ||
ldt.c | ||
machine_kexec_32.c | ||
machine_kexec_64.c | ||
Makefile | ||
mca_32.c | ||
microcode_amd.c | ||
microcode_core.c | ||
microcode_intel.c | ||
mmconf-fam10h_64.c | ||
module.c | ||
mpparse.c | ||
msr.c | ||
paravirt_patch_32.c | ||
paravirt_patch_64.c | ||
paravirt-spinlocks.c | ||
paravirt.c | ||
pci-calgary_64.c | ||
pci-dma.c | ||
pci-iommu_table.c | ||
pci-nommu.c | ||
pci-swiotlb.c | ||
pcspeaker.c | ||
probe_roms.c | ||
process_32.c | ||
process_64.c | ||
process.c | ||
ptrace.c | ||
pvclock.c | ||
quirks.c | ||
reboot_32.S | ||
reboot_fixups_32.c | ||
reboot.c | ||
relocate_kernel_32.S | ||
relocate_kernel_64.S | ||
resource.c | ||
rtc.c | ||
setup_percpu.c | ||
setup.c | ||
signal.c | ||
smp.c | ||
smpboot.c | ||
stacktrace.c | ||
step.c | ||
sys_i386_32.c | ||
sys_x86_64.c | ||
syscall_64.c | ||
syscall_table_32.S | ||
tboot.c | ||
tce_64.c | ||
test_nx.c | ||
test_rodata.c | ||
time.c | ||
tls.c | ||
tls.h | ||
topology.c | ||
trampoline_32.S | ||
trampoline_64.S | ||
trampoline.c | ||
traps.c | ||
tsc_sync.c | ||
tsc.c | ||
verify_cpu.S | ||
vm86_32.c | ||
vmlinux.lds.S | ||
vsmp_64.c | ||
vsyscall_64.c | ||
vsyscall_emu_64.S | ||
vsyscall_trace.h | ||
x86_init.c | ||
x8664_ksyms_64.c | ||
xsave.c |