Howdy Folks, Happy new yeah, happy new bug! With a uefi system, I meet following panic when reboot after I adding `reboot=efi,warm` [call trace]: <0>[ 698.736637] reboot: Restarting system <5>[ 698.737407] reboot: machine restart <1>[ 698.738399] BUG: unable to handle kernel paging request at 00000000ded53e60 <1>[ 698.738924] IP: [<ffff8800dedb946d>] 0xffff8800dedb946d <4>[ 698.739408] PGD 0 <4>[ 698.739868] Oops: 0000 [#1] SMP <4>[ 698.740316] Modules linked in: nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables sg vfat fat snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel arc4 ath9k snd_hda_codec snd_hwdep ath9k_common ath9k_hw snd_seq snd_seq_device ath3k ath snd_pcm snd_page_alloc mac80211 btusb cfg80211 r8169 snd_timer bluetooth snd rfkill mii soundcore shpchp iTCO_wdt iTCO_vendor_support lpc_ich mfd_core pcspkr microcode dcdbas i2c_i801Panic#2 Part2 <4>[ 698.743245] serio_raw i2c_core video xfs libcrc32c usb_storage sd_mod crc_t10dif crct10dif_common ahci libahci libata dm_mirror dm_region_hash dm_log dm_mod <4>[ 698.744276] CPU: 0 PID: 1939 Comm: reboot Not tainted 3.13.0-rc6+ #10 <4>[ 698.744793] Hardware name: Dell Inc. XPS 8500 /0NW73C, BIOS A09 09/05/2012 <4>[ 698.745314] task: ffff8800db6fbe30 ti: ffff88003eb86000 task.ti: ffff88003eb86000 <4>[ 698.745850] RIP: 0010:[<ffff8800dedb946d>] [<ffff8800dedb946d>] 0xffff8800dedb946d <4>[ 698.746394] RSP: 0018:ffff88003eb87cb0 EFLAGS: 00010046 <4>[ 698.746937] RAX: 00000000ded53e18 RBX: 0000000000000000 RCX: ffff8800dedb9a80 <4>[ 698.747494] RDX: ffff8800dedb9c50 RSI: 0000000000000000 RDI: ffff8800dedb9428 <4>[ 698.748055] RBP: 0000000000000001 R08: 0000000000000000 R09: ffff88003eb87ce0 <4>[ 698.748619] R10: ffffffff81a082c0 R11: ffff88003eb87cf8 R12: 0000000028121969 <4>[ 698.749190] R13: 00000000fffffffe R14: 0000000000000cf9 R15: 0000000000000000 <4>[ 698.749771] FS: 00007f16f206c880(0000) GS:ffff88021ec00000(0000) knlGS:0000000000000000 <4>[ 698.750364] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 698.750963] CR2: 00000000ded53e60 CR3: 000000003e2d6000 CR4: 00000000001407f0 Panic#2 Part1 <4>[ 698.751572] Stack: <4>[ 698.752182] ffffffff81a082c0 ffff88003eb87d50 0000000000000082 ffffc9000a27fff8 <4>[ 698.752816] ffff88003eb87d00 0000000000000411 0000000000000001 0000000000010000 <4>[ 698.753455] ffff8800dedb9428 ffffffff8105c556 000000004c564c54 0000000000000000 <4>[ 698.754097] Call Trace: <4>[ 698.754740] [<ffffffff8105c556>] ? efi_call4+0x46/0x80 <4>[ 698.755398] [<ffffffff8105bc5c>] ? virt_efi_reset_system+0x2c/0x30 <4>[ 698.756062] [<ffffffff8103f8d5>] ? native_machine_emergency_restart+0x1a5/0x270 <4>[ 698.756731] [<ffffffff810491f0>] ? native_apic_msr_write+0x30/0x40 <4>[ 698.757399] [<ffffffff8104357b>] ? disable_local_APIC+0x4b/0x50 <4>[ 698.758059] [<ffffffff8103f427>] ? native_machine_restart+0x37/0x40 <4>[ 698.758719] [<ffffffff8103f62f>] ? machine_restart+0xf/0x20 <4>[ 698.759379] [<ffffffff8108e865>] ? kernel_restart+0x45/0x60 <4>[ 698.760034] [<ffffffff8108eba9>] ? SYSC_reboot+0x229/0x260 <4>[ 698.760685] [<ffffffff811b5ee9>] ? do_readv_writev+0x169/0x220 <4>[ 698.761331] [<ffffffff811b6c5e>] ? __fput+0x17e/0x260 <4>[ 698.761972] [<ffffffff811b6d8e>] ? ____fput+0xe/0x10 <4>[ 698.762609] [<ffffffff8108ec7e>] ? SyS_reboot+0xe/0x10 <4>[ 698.763242] [<ffffffff815e87e9>] ? system_call_fastpath+0x16/0x1b <4>[ 698.763876] Code: 4d 8d 4b e8 49 89 43 d8 48 8b 05 47 08 00 00 48 8d 15 f8 07 00 00 48 8d 0d 21 06 00 00 bd 01 00 00 00 45 33 c0 49 89 6b e8 33 f6 <ff> 50 48 48 3b c6 40 0f b6 fe 0f 4d fd e8 bd 05 00 00 40 3a c6 <1>[ 698.765285] RIP [<ffff8800dedb946d>] 0xffff8800dedb946d <4>[ 698.765972] RSP <ffff88003eb87cb0> <4>[ 698.766647] CR2: 00000000ded53e60 <4>[ 698.768462] ---[ end trace b97908aef93ab59d ]--- <0>[ 702.809043] Kernel panic - not syncing: Fatal exception According to Call Trace, the panic happen when call ResetSystem() which is a uefi run time service. It's seems a asm code in efi_stub_64.S I disassembly it with crash got following outputs: crash> dis efi_call4 0xffffffff810518f0 <efi_call4>: mov %rsp,%rax [ ... ] 0xffffffff81051918 <efi_call4+40>: movaps %xmm3,0x30(%rsp) 0xffffffff8105191d <efi_call4+45>: movaps %xmm4,0x20(%rsp) 0xffffffff81051922 <efi_call4+50>: movaps %xmm5,0x10(%rsp) 0xffffffff81051927 <efi_call4+55>: sub $0x20,%rsp [ ... ] So it seems the panic happen when SAVE_XMM? Does SAVE_XMM will trigger paging? (`unable to handle kernel paging request at 00000000ded53e60`) in case it's a hardware special issue: My testbed is a DELL xps x8500 And I'll try to test it on another uefi system. -- Best, Madper -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
