On Sun, 29 Jun 2025, Konstantin Belousov wrote:
On Sat, Jun 28, 2025 at 05:32:17PM +0000, Bjoern A. Zeeb wrote:
Hi,
happened in one of my dev VMs:
# more /etc/wpa_supplicant.conf Illegal instruction (core dumped)
As I see nothing in UPDATING in the range from HEAD to the commit I
rebased --onto b93161a7e38d (downgrade of the kernel) that would
explain this I am wondering.
Mounted the disk image from the base system and checked the core:
Program terminated with signal SIGILL, Illegal instruction.
(gdb) where
#0 0x00003fabd04ebeed in tgetflag_sp (sp=0x3fa3ad42f3a0 <get_term[termbuf]>, id=0x3fa3ad42f3a0
<get_term[termbuf]> "") at /usr/src/contrib/ncurses/ncurses/tinfo/lib_termcap.c:259
#1 0x00003fa3ad404e9e in get_term () at /usr/src/contrib/less/screen.c:1256
#2 0x00003fa3ad4042ef in main (argc=1, argv=0x3fabce1f26b8) at
/usr/src/contrib/less/main.c:344
What is the instruction that faulted?
Also show the registers values used by the instruction.
I am a bit rusty with this user spaec stuff ;-) Hope the below helps.
(gdb) display/i $pc
1: x/i $pc
=> 0x3fabd04ebeed <tgetflag_sp+29>: cmove %rbx,%rcx
(gdb) info f
Stack level 0, frame at 0x3fabce1f25b0:
rip = 0x3fabd04ebeed in tgetflag_sp
(/usr/src/src.pecunia/contrib/ncurses/ncurses/tinfo/lib_termcap.c:259); saved
rip = 0x3fa3ad404e9e
called by frame at 0x3fabce1f2600
source language c.
Arglist at 0x3fabce1f25a0, args: sp=0x3fa3ad42f3a0 <get_term[termbuf]>, id=0x3fa3ad42f3a0
<get_term[termbuf]> ""
Locals at 0x3fabce1f25a0, Previous frame's sp is 0x3fabce1f25b0
Saved registers:
rbx at 0x3fabce1f2590, rbp at 0x3fabce1f25a0, r14 at 0x3fabce1f2598, rip at
0x3fabce1f25a8
(gdb) info r
rax 0x3fabd04fec30 70007166856240
rbx 0x3fabce1f4cb8 70007130115256
rcx 0xd00b620ed25bfd23 -3455560473278415581
rdx 0x3fabce1f2aaa 70007130106538
rsi 0x3fa3ad42f3a0 69972219065248
rdi 0x3fa3ad42f3a0 69972219065248
rbp 0x3fabce1f25a0 0x3fabce1f25a0
rsp 0x3fabce1f25a0 0x3fabce1f25a0
r8 0x11 17
r9 0x3 3
r10 0x10 16
r11 0x40 64
r12 0x3fabd145be60 70007182966368
r13 0x2 2
r14 0x3fa3ad43bab8 69972219116216
r15 0x1 1
rip 0x3fabd04ebeed 0x3fabd04ebeed <tgetflag_sp+29>
eflags 0x10202 [ IF RF ]
cs 0x43 67
ss 0x3b 59
ds 0x3b 59
es 0x3b 59
fs 0x13 19
gs 0x1b 27
fs_base 0x467b85825120 77496334831904
gs_base 0x0 0
| 0x3fabd04ebed7 <tgetflag_sp+7> test %rdi,%rdi
|
| 0x3fabd04ebeda <tgetflag_sp+10> je 0x3fabd04ebef3
<tgetflag_sp+35> |
| 0x3fabd04ebedc <tgetflag_sp+12> mov 0x30(%rdi),%rcx
|
| 0x3fabd04ebee0 <tgetflag_sp+16> test %rcx,%rcx
|
| 0x3fabd04ebee3 <tgetflag_sp+19> mov 0x10d6e(%rip),%rax #
0x3fabd04fcc58 |
| 0x3fabd04ebeea <tgetflag_sp+26> mov (%rax),%rbx
|
| >0x3fabd04ebeed <tgetflag_sp+29> cmove %rbx,%rcx
|
| 0x3fabd04ebef1 <tgetflag_sp+33> jmp 0x3fabd04ebf00
<tgetflag_sp+48> |
| 0x3fabd04ebef3 <tgetflag_sp+35> mov 0x10d5e(%rip),%rax #
0x3fabd04fcc58 |
| 0x3fabd04ebefa <tgetflag_sp+42> mov (%rax),%rbx
|
| 0x3fabd04ebefd <tgetflag_sp+45> mov %rbx,%rcx
|
| 0x3fabd04ebf00 <tgetflag_sp+48> xor %eax,%eax
|
| 0x3fabd04ebf02 <tgetflag_sp+50> test %rcx,%rcx
|
| 0x3fabd04ebf05 <tgetflag_sp+53> je 0x3fabd04ebfe6
<tgetflag_sp+278> |
| 0x3fabd04ebf0b <tgetflag_sp+59> cmpb $0x0,(%rsi)
|
| 0x3fabd04ebf0e <tgetflag_sp+62> je 0x3fabd04ebfe6
<tgetflag_sp+278> |
| 0x3fabd04ebf14 <tgetflag_sp+68> cmpb $0x0,0x1(%rsi)
|
| 0x3fabd04ebf18 <tgetflag_sp+72> je 0x3fabd04ebfe6
<tgetflag_sp+278> |
--
Bjoern A. Zeeb r15:7
