This bug was fixed in the package linux - 5.4.0-159.176
---------------
linux (5.4.0-159.176) focal; urgency=medium
* focal/linux: 5.4.0-159.176 -proposed tracker (LP: #2031149)
* libgnutls report "trap invalid opcode" when trying to install packages over
https (LP: #2031093)
- [Config]: disable CONFIG_GDS_FORCE_MITIGATION
* Fix boot test warning for log_check "CPU: 0 PID: 0 at
arch/x86/kernel/fpu/xstate.c:878 get_xsave_addr+0x98/0xb0" (LP: #2031022)
- x86/pkeys: Revert a5eff7259790 ("x86/pkeys: Add PKRU value to
init_fpstate")
-- Thadeu Lima de Souza Cascardo <casca...@canonical.com> Mon, 14 Aug
2023 08:18:30 -0300
** Changed in: linux (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2031022
Title:
Fix boot test warning for log_check "CPU: 0 PID: 0 at
arch/x86/kernel/fpu/xstate.c:878 get_xsave_addr+0x98/0xb0"
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Focal:
Fix Released
Bug description:
SRU Justification
[Impact]
Gather Data Sampling, affecting Intel processors and assigned
CVE-2022-40982 introduced this warning.The fix is on microcode, but
part of the mitigation on the kernel side is to detect if the
microcode update is not there and disable AVX in case it's supported.
This needed some reshuffle during initialization so that turning off
AVX was possible without it being too late, which also moved the FPU
initialization. See commit
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.4.252&id=6e60443668978131a442df485db3deccb31d5651
This causes the following warning during boot: CPU: 0 PID: 0 at
arch/x86/kernel/fpu/xstate.c:878 get_xsave_addr+0x98/0xb0
Logs:
1546 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.438234] ------------[ cut here ]------------
1547 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.439198] get of unsupported state
1548 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.439206] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/fpu/xstate.c:878
get_xsave_addr+0x98/0xb0
1549 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] Modules linked in:
1550 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-158-lowlatency
#175-Ubuntu
1551 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] Hardware name: NVIDIA NVIDIA DGX-2/NVIDIA DGX-2, BIOS 0.29
06/07/2021
1552 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] RIP: 0010:get_xsave_addr+0x98/0xb0
1553 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] Code: 7e ff ff ff 48 83 c4 08 5b 5d c3 80 3d ed d8 bc 01 00 75 ae
48 c7 c7 52 76 51 9a 89 75 f4 c6 05 da d8 bc 01 01 e8 1a c8 a7 00 <0f> 0b 8b 75
f4 eb 91 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f
1554 09:02:40 INFO | Aug 10 09:01:05 akis
systemd-udevd[3200]: enp58s0np0: Process '/usr/bin/killall -SIGHUP irqbalance'
failed with exit code 1.
1555 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] RSP: 0000:ffffffff9ac03e80 EFLAGS: 00010282
1556 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] RAX: 0000000000000000 RBX: ffffffff9ae47180 RCX: 000000032109e11a
1557 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] RDX: 0000000000000018 RSI: ffffffff9bd8c620 RDI: 0000000000000246
1558 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] RBP: ffffffff9ac03e90 R08: ffffffff9bd8c620 R09: 74726f707075736e
1559 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] R10: 74726f707075736e R11: 6574617473206465 R12: ffffffff9ae47040
1560 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] R13: 0000000000000246 R14: 000000005a1c7469 R15: 000000005a1d7ee0
1561 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] FS: 0000000000000000(0000) GS:ffffa08400400000(0000)
knlGS:0000000000000000
1562 09:02:40 INFO | Aug 10 09:01:05 akis
systemd[1]: Starting Load Kernel Module pstore_zone...
1563 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
1564 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] CR2: ffffa146fffff000 CR3: 000000802c80a001 CR4: 00000000007200b0
1565 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
1566 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
1567 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] Call Trace:
1568 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? show_regs.cold+0x1a/0x1f
1569 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? __warn+0x98/0xe0
1570 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? get_xsave_addr+0x98/0xb0
1571 09:02:40 INFO | Aug 10 09:01:05 akis
systemd[1]: Condition check resulted in Load Kernel Module ramoops being
skipped.
1572 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? report_bug+0xd1/0x100
1573 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? do_error_trap+0x9b/0xc0
1574 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? do_invalid_op+0x3c/0x50
1575 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? get_xsave_addr+0x98/0xb0
1576 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? invalid_op+0x1e/0x30
1577 09:02:40 INFO | Aug 10 09:01:05 akis
systemd[1]: Condition check resulted in OpenVSwitch configuration for cleanup
being skipped.
1578 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ? get_xsave_addr+0x98/0xb0
1579 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] identify_cpu+0x520/0x580
1580 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] identify_boot_cpu+0x10/0x9a
1581 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] arch_cpu_finalize_init+0x9/0x4d
1582 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] start_kernel+0x4a9/0x557
1583 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] x86_64_start_reservations+0x24/0x26
1584 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] x86_64_start_kernel+0x8f/0x93
1585 09:02:40 INFO | Aug 10 09:01:05 akis
systemd[1]: Condition check resulted in Show Plymouth Boot Screen being skipped.
1586 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] secondary_startup_64+0xa4/0xb0
1587 09:02:40 INFO | Aug 10 09:01:05 akis kernel: [
13.440197] ---[ end trace 6200f61a0ffeb796 ]---
[Fix]
This commit seems to fix the warning
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v4.14.321&id=b3607269ff57
[Test plan]
Booted locally and no warning shown.
[Regression potentials]
We may see issue during FPU init.
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