Messages in this thread | | | Subject | Re: 5.7.0 / BUG: kernel NULL pointer dereference / setup_cpu_watcher | From | Jürgen Groß <> | Date | Fri, 5 Jun 2020 11:18:36 +0200 |
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On 05.06.20 10:36, Christian Kujau wrote: > Hi, > > I'm running a small Xen PVH domain and upgrading from vanilla 5.6.0 to > 5.7.0 caused the splat below, really early during boot. The configuration > has not changed, all new "make oldconfig" prompts have been answered with > "N". Old and new config, dmesg are here: > > http://nerdbynature.de/bits/5.7.0/ > > Searching the interwebs for similar reports didn't return much: > > * drm_sched_get_cleanup_job: BUG: kernel NULL pointer dereference > https://bugzilla.redhat.com/show_bug.cgi?id=1822984 -- but this > appears to be really DRM related. - https://lkml.org/lkml/2020/4/10/545 > > * A recent mm/vmstat patch, mentioning "device_offline" in its output > https://patchwork.kernel.org/patch/11563009/ > > But other than a few overlapping strings, I guess all of that is totally > unrelated :(
Do you happen to start the guest with vcpus < maxvcpus?
If yes there is already a patch pending for 5.8:
https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git/commit/?h=for-linus-5.8&id=c54b071c192dfe8061336f650ceaf358e6386e0b
Juergen
> > Thanks, > Christian. > > > Note: that "Xen Platform PCI: unrecognised magic value" on the top appears > in 5.6 kernels as well, but no ill effects so far. > > --------------------------------------------------------------- > Xen Platform PCI: unrecognised magic value > ACPI: No IOAPIC entries present > BUG: kernel NULL pointer dereference, address: 00000000000002d0 > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 0 P4D 0 > Oops: 0000 [#1] SMP PTI > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0 #2 > RIP: 0010:device_offline+0x8/0xf0 > Code: 48 89 e7 e8 3a ee f3 ff 4c 89 e0 48 83 c4 10 5b 41 5c c3 45 31 e4 48 83 c4 10 4c 89 e0 5b 41 5c c3 90 41 54 55 53 48 83 ec 10 <f6> 87 d0 02 00 00 01 0f 85 ca 00 00 00 48 89 fb 48 8b 7f 48 48 85 > RSP: 0000:ffffbd9100013e78 EFLAGS: 00010286 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000820001fa > RDX: ffff9c9c3dd00000 RSI: 00000000820001fa RDI: 0000000000000000 > RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000000 > R10: ffff9c9c3d5072a8 R11: 0000000000000000 R12: ffff9c9c3d594720 > R13: ffffffff8a57e5a8 R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff9c9c3dc00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000000002d0 CR3: 000000006b00a001 CR4: 00000000001606b0 > Call Trace: > setup_cpu_watcher+0x44/0x60 > ? plt_clk_driver_init+0xe/0xe > setup_vcpu_hotplug_event+0x23/0x26 > do_one_initcall+0x47/0x180 > kernel_init_freeable+0x13b/0x19d > ? rest_init+0x95/0x95 > kernel_init+0x5/0xeb > ret_from_fork+0x35/0x40 > Modules linked in: > CR2: 00000000000002d0 > ---[ end trace b0cc587db609787f ]--- >
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