[ipxe-devel] Kernel panic after ipxe boot

[Jarrod Johnson]

I recently went to refresh our iPXE code and hit a problem, we'd see the
following kernel panic when we chain boot snponly.efi to elilo (long story)
to centos7.5 kernel:

[    0.000567] invalid opcode: 0000 [#1] SMP
[    0.005161] Modules linked in:
[    0.008580] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
3.10.0-862.3.2.el7.x86_64 #1
[    0.017012] Hardware name: Lenovo THINKSYSTEM SD530
-[7X2104Z000]-/-[7X2104Z000]-, BIOS -[TEE123B-1.40]- 03/13/2018
[    0.028639] task: ffffffff90416480 ti: ffffffff90400000 task.ti:
ffffffff90400000
[    0.036975] RIP: 0010:[<0000000000000008>]  [<0000000000000008>] 0x8
[    0.044070] RSP: 0000:ffffffff90403d48  EFLAGS: 00010046
[    0.049988] RAX: 00000000ab79af00 RBX: 0000000003111004 RCX:
00000000ab5f2bd0
[    0.057937] RDX: 0000000000000000 RSI: 00000000ab5c3300 RDI:
0000000000000001
[    0.065885] RBP: 00000000ae6d4304 R08: ffffffff90403d98 R09:
00000000ab5c3300
[    0.073834] R10: 0000000000000030 R11: 00000000ab5f3730 R12:
0000000000000000
[    0.081781] R13: ffff909f3fe32000 R14: 0000000000000246 R15:
000000012a80e000
[    0.089723] FS:  0000000000000000(0000) GS:ffff90a360c00000(0000)
knlGS:0000000000000000
[    0.098736] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.105135] CR2: ffff909e6ae2e000 CR3: 000000017fe30000 CR4:
00000000000606b0
[    0.113076] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[    0.121025] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[    0.128972] Call Trace:
[    0.131699]  [<ffffffff8f8693c5>] ?
__raw_callee_save___native_queued_spin_unlock+0x15/0x30
[    0.141006]  [<ffffffff8f8689fe>] ? native_flush_tlb_global+0x8e/0xc0
[    0.148189]  [<ffffffff8f885f48>] ? efi_call+0x58/0x90
[    0.153921]  [<ffffffff8f8733e7>] ? kernel_map_pages_in_pgd+0xe7/0xf0
[    0.161099]  [<ffffffff9058fa8a>] ? efi_enter_virtual_mode+0x33c/0x4bf
[    0.168380]  [<ffffffff9056c13c>] ? start_kernel+0x3c1/0x467
[    0.174691]  [<ffffffff9056bb7b>] ? repair_env_string+0x5c/0x5c
[    0.181290]  [<ffffffff9056b120>] ? early_idt_handler_array+0x120/0x120
[    0.188663]  [<ffffffff9056b72f>] ? x86_64_start_reservations+0x24/0x26
[    0.196035]  [<ffffffff9056b885>] ? x86_64_start_kernel+0x154/0x177
[    0.203025]  [<ffffffff8f8000d5>] ? start_cpu+0x5/0x14
[    0.208751] Code:  Bad RIP value.
[    0.212480] RIP  [<0000000000000008>] 0x8
[    0.216962]  RSP <ffffffff90403d48>
[    0.220856] ---[ end trace f68728a0d3053b52 ]---
[    0.226004] Kernel panic - not syncing: Fatal exception

I bisected it down to this commit:
https://git.ipxe.org/mirror/build/ipxe.git/commit/c89a446cf09f30a121ae21d91f4a1aa071044084

If I revert that commit, the kernel panic no longer occurs.
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