Re: [stable 4.9] PANIC: double fault, error_code: 0x0 - clang boot failed on x86_64
From: Greg Kroah-Hartman
Date: Thu Nov 26 2020 - 01:38:35 EST
On Thu, Nov 26, 2020 at 10:14:43AM +0530, Naresh Kamboju wrote:
> Linaro recently started building and testing with stable branches with clang.
> Stable 4.9 branch kernel built with clang 10 boot crashed on x86 and qemu_x86.
> We do not have base line results to compare with.
>
> steps to build and boot:
> # build kernel with tuxmake
> # sudo pip3 install -U tuxmake
> # tuxmake --runtime docker --target-arch x86 --toolchain clang-10
> --kconfig defconfig --kconfig-add
> https://builds.tuxbuild.com/1kgtX7QEDmhvj6OfbZBdlGaEple/config
> # boot qemu_x86_64
> # /usr/bin/qemu-system-x86_64 -cpu host -enable-kvm -nographic -net
> nic,model=virtio,macaddr=DE:AD:BE:EF:66:14 -net tap -m 1024 -monitor
> none -kernel kernel/bzImage --append "root=/dev/sda rootwait
> console=ttyS0,115200" -hda
> rootfs/rpb-console-image-lkft-intel-corei7-64-20201022181159-3085.rootfs.ext4
> -m 4096 -smp 4 -nographic
>
> Crash log:
> ---------------
> [ 14.121499] Freeing unused kernel memory: 1896K
> [ 14.126962] random: fast init done
> [ 14.206005] PANIC: double fault, error_code: 0x0
> [ 14.210633] CPU: 1 PID: 1 Comm: systemd Not tainted 4.9.246-rc1 #2
> [ 14.216809] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [ 14.224196] task: ffff88026e2c0000 task.stack: ffffc90000020000
> [ 14.230105] RIP: 0010:[<ffffffff8117ec2b>] [<ffffffff8117ec2b>]
> proc_dostring+0x13b/0x1e0
> [ 14.238374] RSP: 0018:000000000000000c EFLAGS: 00010297
> [ 14.243676] RAX: 00005638939fb850 RBX: 000000000000000c RCX: 00005638939fb850
> [ 14.250799] RDX: 000000000000000c RSI: 0000000000000000 RDI: 000000000000007f
> [ 14.257925] RBP: ffffc90000023d98 R08: ffffc90000023ef8 R09: 00005638939fb850
> [ 14.265049] R10: 0000000000000000 R11: ffffffff8117f9e0 R12: ffffffff82479cf0
> [ 14.272171] R13: ffffc90000023ef8 R14: ffffc90000023dd8 R15: 000000000000007f
> [ 14.279298] FS: 00007f57fbce8840(0000) GS:ffff880277880000(0000)
> knlGS:0000000000000000
> [ 14.287384] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 14.293120] CR2: fffffffffffffff8 CR3: 000000026d58a000 CR4: 0000000000360670
> [ 14.300243] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 14.307368] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 14.314491] Stack:
> [ 14.316504] Call Trace:
> [ 14.318955] Code: c3 49 8b 10 31 f6 48 01 da 49 89 10 49 83 3e 00
> 74 49 41 83 c7 ff 49 63 ff 4c 89 c9 0f 1f 40 00 48 39 fe 73 36 48 89
> c8 48 89 dc <e8> b0 9d 3a 00 85 c0 0f 85 8c 00 00 00 84 d2 74 1f 80 fa
> 0a 74
> [ 14.338906] Kernel panic - not syncing: Machine halted.
> [ 14.344123] CPU: 1 PID: 1 Comm: systemd Not tainted 4.9.246-rc1 #2
> [ 14.350291] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [ 14.357677] ffff880277888e80 ffffffff81518ae9 ffff880277888e98
> ffffffff82971a10
> [ 14.365129] 000000000000000f 0000000000000000 0000000000000086
> ffffffff820c5d57
> [ 14.372584] ffff880277888f08 ffffffff81175736 0000003000000008
> ffff880277888f18
> [ 14.380038] Call Trace:
> [ 14.382481] <#DF> [ 14.384406] [<ffffffff81518ae9>] dump_stack+0xa9/0x100
> [ 14.389641] [<ffffffff81175736>] panic+0xe6/0x2a0
> [ 14.394432] [<ffffffff810c9911>] df_debug+0x31/0x40
> [ 14.399389] [<ffffffff81096312>] do_double_fault+0x102/0x140
> [ 14.405128] [<ffffffff81ccc987>] double_fault+0x27/0x30
> [ 14.410440] [<ffffffff8117f9e0>] ? proc_put_long+0xc0/0xc0
> [ 14.416004] [<ffffffff8117ec2b>] ? proc_dostring+0x13b/0x1e0
> [ 14.421739] <EOE> [ 14.423703] Kernel Offset: disabled
> [ 14.427209] ---[ end Kernel panic - not syncing: Machine halted.
>
> Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
>
> full test log,
> https://lkft.validation.linaro.org/scheduler/job/1978901#L916
> https://lkft.validation.linaro.org/scheduler/job/1980839#L578
Is the mainline 4.9 tree supposed to work with clang? I didn't think
that upstream effort started until 4.19 or so.
thanks,
greg k-h