* [Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally
2021-02-01 9:06 [Bug 1914021] [NEW] qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally Dong JianQiang
@ 2021-02-01 9:48 ` Peter Maydell
2021-02-01 10:42 ` Dong JianQiang
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Peter Maydell @ 2021-02-01 9:48 UTC (permalink / raw)
To: qemu-devel
QEMU 4.0 is quite old now -- does this reproduce with a more recent
QEMU?
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https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
New
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
To manage notifications about this bug go to:
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^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally
2021-02-01 9:06 [Bug 1914021] [NEW] qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally Dong JianQiang
2021-02-01 9:48 ` [Bug 1914021] " Peter Maydell
@ 2021-02-01 10:42 ` Dong JianQiang
2021-02-01 11:05 ` Peter Maydell
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Dong JianQiang @ 2021-02-01 10:42 UTC (permalink / raw)
To: qemu-devel
yes, it reproduced on QEMU 5.0.0.
--
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
New
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1914021/+subscriptions
^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally
2021-02-01 9:06 [Bug 1914021] [NEW] qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally Dong JianQiang
2021-02-01 9:48 ` [Bug 1914021] " Peter Maydell
2021-02-01 10:42 ` Dong JianQiang
@ 2021-02-01 11:05 ` Peter Maydell
2021-02-01 13:06 ` Dong JianQiang
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Peter Maydell @ 2021-02-01 11:05 UTC (permalink / raw)
To: qemu-devel
For me, with current head-of-git QEMU, the program crashes with a
SIGSEGV very early in execution, because:
0x00008260: e59f30f0 ldr r3, [pc, #0xf0]
loads 0 into r3, and then
0x00008270: e1a0d003 mov sp, r3
sets sp to 0, and then
0x000087b0: e92d4030 push {r4, r5, lr}
tries to write to addres 0, which causes a SEGV.
This happens whether using the gdbstub or not.
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You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
New
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1914021/+subscriptions
^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally
2021-02-01 9:06 [Bug 1914021] [NEW] qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally Dong JianQiang
` (2 preceding siblings ...)
2021-02-01 11:05 ` Peter Maydell
@ 2021-02-01 13:06 ` Dong JianQiang
2021-02-01 13:54 ` Peter Maydell
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Dong JianQiang @ 2021-02-01 13:06 UTC (permalink / raw)
To: qemu-devel
0x00008260 <+64>: ldr r3, [pc, #240]
0x00008264 <+68>: cmp r1, #0
=> 0x00008268 <+72>: beq 0x8270
0x0000826c <+76>: mov r3, r1
0x00008270 <+80>: mov sp, r3
(gdb) p/x $r1
$2 = 0xfffef690
But r1 is not zero when using Gdb remote-debug, so it will enter
0x0000826c <+76>: mov r3, r1
QEMU 5.0.0.
GNU gdb (GDB; SUSE Linux Enterprise 12) 8.0.1
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
New
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1914021/+subscriptions
^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally
2021-02-01 9:06 [Bug 1914021] [NEW] qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally Dong JianQiang
` (3 preceding siblings ...)
2021-02-01 13:06 ` Dong JianQiang
@ 2021-02-01 13:54 ` Peter Maydell
2021-05-12 18:02 ` Thomas Huth
2021-07-12 4:17 ` Launchpad Bug Tracker
6 siblings, 0 replies; 8+ messages in thread
From: Peter Maydell @ 2021-02-01 13:54 UTC (permalink / raw)
To: qemu-devel
Oh, your code is trying to use the SYS_HEAPINFO semihosting call to
figure out where the stack and heap are. This is generally a bad idea if
you're using QEMU user-mode emulation: you start with a perfectly good
stack pointer and you should just use the usual Linux syscalls to
allocate heap if you need it.
I have no idea where your code is getting r1 from -- it's too painful to
try to reverse-engineer it from the binary. I can't repro any difference
between with-gdb and without -- for me with current QEMU r1 is 0 whether
running with the gdb stub or not.
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
New
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1914021/+subscriptions
^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally
2021-02-01 9:06 [Bug 1914021] [NEW] qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally Dong JianQiang
` (4 preceding siblings ...)
2021-02-01 13:54 ` Peter Maydell
@ 2021-05-12 18:02 ` Thomas Huth
2021-07-12 4:17 ` Launchpad Bug Tracker
6 siblings, 0 replies; 8+ messages in thread
From: Thomas Huth @ 2021-05-12 18:02 UTC (permalink / raw)
To: qemu-devel
The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.
If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".
If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:
1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:
https://gitlab.com/qemu-project/qemu/-/issues
and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.
2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).
Thank you and sorry for the inconvenience.
** Changed in: qemu
Status: New => Incomplete
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
Incomplete
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1914021/+subscriptions
^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally
2021-02-01 9:06 [Bug 1914021] [NEW] qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally Dong JianQiang
` (5 preceding siblings ...)
2021-05-12 18:02 ` Thomas Huth
@ 2021-07-12 4:17 ` Launchpad Bug Tracker
6 siblings, 0 replies; 8+ messages in thread
From: Launchpad Bug Tracker @ 2021-07-12 4:17 UTC (permalink / raw)
To: qemu-devel
[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
Expired
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1914021/+subscriptions
^ permalink raw reply [flat|nested] 8+ messages in thread