[Bug target/121432] [15/16 regression] GCC has a regression on Microblaze since r15-1619-g3b9b8d6cfdf593
neal.frager at amd dot com
gcc-bugzilla@gcc.gnu.org
Fri Mar 27 14:07:00 GMT 2026
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121432
--- Comment #35 from Neal Frager <neal.frager at amd dot com> ---
(In reply to Waldemar Brodkorb from comment #34)
> Hi,
>
> with this patch I still get following output on my Numato Mimas A7 Mini:
> [ 3.503255] Run /init as init process
> [ 3.506819] with arguments:
> [ 3.509763] /init
> [ 3.512005] with environment:
> [ 3.515114] HOME=/
> [ 3.517706] TERM=linux
> [ 3.530417] Illegal opcode exception in kernel mode.
> [ 3.534357] Oops: opcode exception, sig: 7
> [ 3.538428] CPU: 0 UID: 0 PID: 1 Comm: init Not tainted 6.18.18-1 #2 NONE
> [ 3.545239] Registers dump: mode=80821ED0
> [ 3.549380] r1=C0821ED0, r2=00000000, r3=FFFFFFFE, r4=C0802980
> [ 3.555255] r5=CFDF3430, r6=00000C5F, r7=C0849000, r8=C0848000
> [ 3.561130] r9=CFE108E0, r10=000065A2, r11=00000C60, r12=CFDE9338
> [ 3.567267] r13=00000000, r14=C0821F68, r15=C00093A8, r16=00000000
> [ 3.573486] r17=C00093B4, r18=3F7B7000, r19=BFCBCAA4, r20=48008E3C
> [ 3.579706] r21=00000000, r22=48000000, r23=48009070, r24=BFCBDF2C
> [ 3.585927] r25=BFCBDF24, r26=BFCBDF38, r27=BFCBDDC0, r28=48009070
> [ 3.592148] r29=00000000, r30=00000001, r31=C082C000, rPC=C00093B4
> [ 3.598369] msr=000046A2, ear=BFCBDF24, esr=BFCBDF38, fsr=BFCBDDC0
> [ 3.604963] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000007
> [ 3.612280] ---[ end Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000007 ]---
>
> GCC 15.2.0, Binutils 2.46.0, Linux 6.18.18, uClibc-ng 1.0.57 or glibc 2.42.
> An older Linux kernel built with Buildroot 2018.11 does boot fine, so I do
> not think it is my bitstream, which is behaving wrong. What could be the
> reason for this panic?
I just updated the qemu_microblazeel_mmu_defconfig from Linux 6.18.7 to 6.18.18
and here is my boot log:
output/host/bin/qemu-system-microblazeel -M petalogix-s3adsp1800 -kernel
output/images/linux.bin -serial stdio
VNC server running on 127.0.0.1:5900
random: crng init done
Ramdisk addr 0x00000000,
FDT at 0x908a0f9c
Linux version 6.18.18 (nealf@xirengwts09)
(microblazeel-buildroot-linux-gnu-gcc.br_real (Buildroot
2026.02-292-gc897438742-dirty) 15.2.0, GNU ld (GNU Binutils) 2.45.1) #2 Fri Mar
27 14:05:36 GMT 2026
setup_memory: min_low_pfn: 0x90000
setup_memory: max_low_pfn: 0x98000
setup_memory: max_pfn: 0x98000
Zone ranges:
DMA [mem 0x0000000090000000-0x0000000097ffffff]
Normal empty
Movable zone start for each node
Early memory node ranges
node 0: [mem 0x0000000090000000-0x0000000097ffffff]
Initmem setup node 0 [mem 0x0000000090000000-0x0000000097ffffff]
OF: reserved mem: Reserved memory: No reserved-memory node in the DT
setup_cpuinfo: initialising
setup_cpuinfo: No PVR support. Using static CPU info from FDT
wt_msr
pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
pcpu-alloc: [0] 0
Kernel command line:
printk: log buffer data + meta data: 131072 + 409600 = 540672 bytes
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
Built 1 zonelists, mobility grouping on. Total pages: 32768
mem auto-init: stack:all(zero), heap alloc:off, heap free:off
SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
irq-xilinx: /plb/interrupt-controller@81800000: num_irq=4, edge=0xa
ERROR: CPU CCF input clock not found
/plb/timer@83c00000: irq=1
ERROR: timer CCF input clock not found
ERROR: Using CPU clock frequency
clocksource: xilinx_clocksource: mask: 0xffffffff max_cycles: 0xffffffff,
max_idle_ns: 30580167144 ns
xilinx_timer_shutdown
xilinx_timer_set_periodic
sched_clock: 32 bits at 63MHz, resolution 16ns, wraps every 34359738360ns
Console: colour dummy device 80x25
printk: legacy console [tty0] enabled
Calibrating delay loop... 1709.05 BogoMIPS (lpj=3418112)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Memory: 120420K/131072K available (5164K kernel code, 511K rwdata, 928K rodata,
2155K init, 188K bss, 10324K reserved, 0K cma-reserved)
devtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns:
7645041785100000 ns
posixtimers hash table entries: 512 (order: 0, 2048 bytes, linear)
futex hash table entries: 256 (4096 bytes on 1 NUMA nodes, total 4 KiB,
linear).
NET: Registered PF_NETLINK/PF_ROUTE protocol family
DMA: preallocated 128 KiB GFP_KERNEL pool for atomic allocations
DMA: preallocated 128 KiB GFP_KERNEL|GFP_DMA pool for atomic allocations
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti
<giometti@linux.it>
PTP clock support registered
clocksource: Switched to clocksource xilinx_clocksource
NET: Registered PF_INET protocol family
IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear)
tcp_listen_portaddr_hash hash table entries: 1024 (order: 0, 4096 bytes,
linear)
Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
TCP bind hash table entries: 1024 (order: 1, 8192 bytes, linear)
TCP: Hash tables configured (established 1024 bind 1024)
UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
NET: Registered PF_UNIX/PF_LOCAL protocol family
workingset: timestamp_bits=30 max_order=15 bucket_order=0
io scheduler mq-deadline registered
io scheduler kyber registered
84000000.serial: ttyUL0 at MMIO 0x84000000 (irq = 3, base_baud = 0) is a
uartlite
printk: legacy console [ttyUL0] enabled
xilinx_emaclite 81000000.ethernet: Device Tree Probing
xilinx_emaclite 81000000.ethernet: Failed to register mdio bus.
xilinx_emaclite 81000000.ethernet: MAC address is now 02:00:00:00:00:00
xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to
0xf5e00bed, irq=2
NET: Registered PF_INET6 protocol family
Segment Routing with IPv6
In-situ OAM (IOAM) with IPv6
sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
NET: Registered PF_PACKET protocol family
clk: Disabling unused clocks
Freeing unused kernel image (initmem) memory: 2152K
This architecture does not have kernel memory protection.
Run /init as init process
with arguments:
/init
with environment:
HOME=/
TERM=linux
Saving 256 bits of creditable seed for next boot
Starting syslogd: OK
Starting klogd: OK
Running sysctl: OK
Starting network: udhcpc: started, v1.37.0
udhcpc: broadcasting discover
udhcpc: broadcasting select for 10.0.2.15, server 10.0.2.2
udhcpc: lease of 10.0.2.15 obtained from 10.0.2.2, lease time 86400
deleting routers
adding dns 10.0.2.3
OK
Starting crond: OK
Welcome to Buildroot
buildroot login: root
#
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