Messages in this thread | | | Date | Thu, 4 Jan 2018 16:37:24 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: "BUG: using smp_processor_id() in preemptible" with KPTI on 4.14.11 |
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On Thu, 4 Jan 2018, Thomas Zeitlhofer wrote: > On Thu, Jan 04, 2018 at 01:55:28PM +0100, Greg Kroah-Hartman wrote: > > > > > > on an Ivybridge CPU, I get with 4.14.11: > > > > > > > > > > > > BUG: using smp_processor_id() in preemptible [00000000] code: ovsdb-server/4510 > > > > > > caller is native_flush_tlb_single+0x57/0xc0 > > > > > > CPU: 3 PID: 4510 Comm: ovsdb-server Not tainted 4.14.11-kvm-00434-gcd0b8eb84f5c #3 > > > > > > Hardware name: MSI MS-7798/B75MA-P45 (MS-7798), BIOS V1.9 09/30/2013 > > > > > > Call Trace: > > > > > > dump_stack+0x5c/0x86 > > > > > > check_preemption_disabled+0xdd/0xe0 > > > > > > native_flush_tlb_single+0x57/0xc0 > > > > > > ? __set_pte_vaddr+0x2d/0x40 > > > > > > __set_pte_vaddr+0x2d/0x40 > > > > > > set_pte_vaddr+0x2f/0x40 > > > > > > cea_set_pte+0x30/0x40 > > > > > > ds_update_cea.constprop.4+0x4d/0x70 > > > > > > reserve_ds_buffers+0x159/0x410 > > > > > > ? wp_page_copy+0x36d/0x6a0 > > > > > > x86_reserve_hardware+0x150/0x160 > > > > > > x86_pmu_event_init+0x3e/0x1f0 > > > > > > perf_try_init_event+0x69/0x80 > > > > > > perf_event_alloc+0x652/0x740 > > > > > > SyS_perf_event_open+0x3f6/0xd60 > > > > > > do_syscall_64+0x5c/0x190 > > > > > > entry_SYSCALL64_slow_path+0x25/0x25 > > > > > > RIP: 0033:0x74a1d94580b9 > > > > > > RSP: 002b:00007fff0c01d5d8 EFLAGS: 00000206 ORIG_RAX: 000000000000012a > > > > > > RAX: ffffffffffffffda RBX: 00007fff0c01d7b0 RCX: 000074a1d94580b9 > > > > > > RDX: 00000000ffffffff RSI: 0000000000000000 RDI: 00007fff0c01d5e0 > > > > > > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000007000000000 > > > > > > R10: 00000000ffffffff R11: 0000000000000206 R12: 0000000000000008 > > > > > > R13: 0000000000000000 R14: 00007fff0c01d790 R15: 00005df43a799600 > > > > > > > > > > > > This does not show up when booting with pti=off.
Right, because the code path is not invoked ....
> > Odd, does 4.15-rc6 also trigger the same error? > > Yes: > > BUG: using smp_processor_id() in preemptible [00000000] code: ovsdb-server/4498 > caller is native_flush_tlb_single+0x57/0xc0 > CPU: 2 PID: 4498 Comm: ovsdb-server Not tainted 4.15.0-rc6-kvm-00423-gea1908c252eb #3 > Hardware name: MSI MS-7798/B75MA-P45 (MS-7798), BIOS V1.9 09/30/2013 > Call Trace: > dump_stack+0x5c/0x86 > check_preemption_disabled+0xdd/0xe0 > native_flush_tlb_single+0x57/0xc0 > ? __set_pte_vaddr+0x2d/0x40 > __set_pte_vaddr+0x2d/0x40 > set_pte_vaddr+0x2f/0x40 > cea_set_pte+0x30/0x40 > ds_update_cea.constprop.4+0x4d/0x70 > reserve_ds_buffers+0x159/0x410 > ? wp_page_copy+0x370/0x6c0 > x86_reserve_hardware+0x150/0x160 > x86_pmu_event_init+0x3e/0x1f0 > perf_try_init_event+0x69/0x80 > perf_event_alloc+0x652/0x740 > SyS_perf_event_open+0x3f6/0xd60 > do_syscall_64+0x5c/0x190 > entry_SYSCALL64_slow_path+0x25/0x25 > RIP: 0033:0x72bff0a3c0b9 > RSP: 002b:00007ffed11c2f18 EFLAGS: 00000206 ORIG_RAX: 000000000000012a > RAX: ffffffffffffffda RBX: 00007ffed11c30f0 RCX: 000072bff0a3c0b9 > RDX: 00000000ffffffff RSI: 0000000000000000 RDI: 00007ffed11c2f20 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000007000000000 > R10: 00000000ffffffff R11: 0000000000000206 R12: 0000000000000008 > R13: 0000000000000000 R14: 00007ffed11c30d0 R15: 000060986ecfb600 > device ovs-system entered promiscuous mode > netlink: 'ovs-vswitchd': attribute type 5 has an invalid length. > > In addition, with v4.15-rc6, netlink messages like in the last line show > up, but I guess this is a different openvswitch related issue. > > > Thomas is working on an > > issue with KALSR (see lkml with: > > Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs > > ) > > Yes, I have also seen that thread, but I did not see any similarities to > my issue. Anyway, I also tried out the patch proposed in > https://lkml.org/lkml/2018/1/4/313 but it does not change anything here.
Correct. I'm looking into a fix. Stay tuned.
Thanks,
tglx
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