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 :( 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 ]--- -- BOFH excuse #440: Cache miss - please take better aim next time