[Bug]unable to handle kernel paging request at 000000006b4fd010

[quanxian]

Description
On Multiple Purley (2S/4S) machines, appending "reboot=efi" to the kernel boot parameters causes panic during reboot. It happens with upstream kernel as well as with RHEL 7.x kernels.

[ 31.529203] Restarting system.
[ 31.532261] reboot: machine restart
[ 31.536474] BUG: unable to handle kernel paging request at 000000006b4fd010
[ 31.543458] IP: [<fffffffeecff9889>] 0xfffffffeecff9889
[ 31.548700] PGD 34849063 PUD 3484a063 PMD 0
[ 31.553038] Oops: 0000 1 SMP
[ 31.556318] Modules linked in: xfs libcrc32c sd_mod crc_t10dif crct10dif_generic crct10dif_pclmul crct10dif_common ahci libahci libata dm_mirror dm_region_hash dm_log dm_mod
[ 31.572112] CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 3.10.0-820.el7.x86_64 #1
[ 31.579832] Hardware name: Intel Corporation PURLEY/PURLEY, BIOS SE5C620.86B.01.00.0572.071320170923 07/13/2017
[ 31.589888] task: ffff880034a80000 ti: ffff880034a1c000 task.ti: ffff880034a1c000
[ 31.597348] RIP: 0010:[<fffffffeecff9889>] [<fffffffeecff9889>] 0xfffffffeecff9889
[ 31.605011] RSP: 0018:ffff880034a1fb30 EFLAGS: 00010006
[ 31.610311] RAX: 0000000000000000 RBX: ffff880034a1fbf0 RCX: 000000006b4fd000
[ 31.617427] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880034a1fbd0
[ 31.624544] RBP: ffff880034a1fd58 R08: ffff880034a1fbf0 R09: ffff880034a1fbd0
[ 31.631659] R10: fffffffeecffb1e8 R11: ffff880034a1fafe R12: 0000000000000000
[ 31.638774] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
[ 31.645889] FS: 00007f7c591d5840(0000) GS:ffff880037800000(0000) knlGS:0000000000000000
[ 31.653955] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 31.673920] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 31.681035] PKRU: 55555554
[ 31.683740] Call Trace:
[ 31.686187] [<ffffffff811f22ea>] ? kmem_cache_alloc+0x1ba/0x1e0
[ 31.692183] [<ffffffff813f6da0>] ? acpi_ut_create_generic_state+0x37/0x54
[ 31.699041] [<ffffffff81352414>] ? vsnprintf+0x234/0x6a0
[ 31.704424] [<ffffffff813540b7>] ? __const_udelay+0x27/0x30
[ 31.710070] [<ffffffff8143f6c7>] ? serial8250_console_putchar+0x27/0x30
[ 31.716755] [<ffffffff8143f500>] ? wait_for_xmitr+0x40/0xa0
[ 31.722401] [<ffffffff810829a8>] ? efi_call+0x58/0x90
[ 31.727527] [<ffffffff810bd702>] ? up+0x32/0x50
[ 31.732139] [<ffffffff815693bc>] virt_efi_reset_system+0x5c/0x110
[ 31.738301] [<ffffffff81053062>] native_machine_emergency_restart+0x182/0x250
[ 31.745501] [<ffffffff81056e9d>] ? clear_local_APIC+0x12d/0x2a0
[ 31.751493] [<ffffffff81052b37>] native_machine_restart+0x37/0x40
[ 31.757657] [<ffffffff81052ddf>] machine_restart+0xf/0x20
[ 31.763132] [<ffffffff810a9265>] kernel_restart+0x45/0x60
[ 31.768605] [<ffffffff810a94a9>] SYSC_reboot+0x229/0x260
[ 31.773991] [<ffffffff810d261c>] ? set_next_entity+0x3c/0xe0
[ 31.779725] [<ffffffff8102962b>] ? __switch_to+0x15b/0x590
[ 31.785283] [<ffffffff816f8be4>] ? __schedule+0x3a4/0x8b0
[ 31.790756] [<ffffffff810a954e>] SyS_reboot+0xe/0x10
[ 31.795798] [<ffffffff81704d09>] system_call_fastpath+0x16/0x1b
[ 31.801785] Code: 44 24 40 8b 40 0c b9 04 00 00 00 48 6b c9 00 89 44 0c 20 48 8b 44 24 40 8b 40 04 25 ff ff 00 00 8b c0 48 6b c0 10 48 8b 4c 24 20 <48> 8b 44 01 10 48 89 44 24 28 48 8b 44 24 28 48 83 c4 38 c3 cc
[ 31.822139] RIP [<fffffffeecff9889>] 0xfffffffeecff9889
[ 31.827466] RSP <ffff880034a1fb30>
[ 31.830951] CR2: 000000006b4fd010
[ 31.834261] --[ end trace 78645683992b62db ]--
[ 31.868316] Kernel panic - not syncing: Fatal exception
[ 31.873535] Kernel Offset: disabled
[ 31.907967] Rebooting in 10 seconds..

Target Kernel:4.20
Target Release: 19.04

[quanxian (quanxian-wang)]

The patches are in TIP tree.
Commit ID's:
9dbbedaa6171247c4c7c40b83f05b200a117c2e0
3425d934fc0312f62024163736a7afe4de20c10f

and.. they are targeted for 4.20