Hi, My setup is as follows: l4linux 4.19.0-l4 Fiasco.OC Raspberry Pi 3 Model B I am running a helloworld.go program which is causing the following stack trace. (gdb) bt full #0 0xffff0f60 in ?? () No symbol table info available. #1 0x0001143c in kernelCAS64 () at /usr/local/go/src/sync/atomic/asm_linux_arm.s:112 No locals. #2 0x0001103c in sync/atomic.loadUint64 (addr=0x10442080, val=48) at /usr/local/go/src/sync/atomic/64bit_arm.go:10 No locals. #3 0x00071f44 in internal/poll.(*fdMutex).rwlock (mu=0x10442080, read=false, ~r1=160) at /usr/local/go/src/internal/poll/fd_mutex.go:130 mutexBit.lo = 4 mutexMask.hi = 2147481600 mutexMask.lo = 0 mutexSema = 0x1044208c mutexWait.hi = 2048 mutexWait.lo = 0 #4 0x00072314 in internal/poll.(*FD).writeLock (fd=0x10442080, ~r0=...) at /usr/local/go/src/internal/poll/fd_mutex.go:237 No locals. #5 0x00072a94 in internal/poll.(*FD).Write (fd=0x10442080, p=..., ~r1=0, ~r2=...) at /usr/local/go/src/internal/poll/fd_unix.go:243 n = -1212420096 nn = 118 --Type <RET> for more, q to quit, c to continue without paging--c #6 0x00073958 in os.(*File).write (b=..., err=..., f=0x1040c0f0, n=2729821 44) at /usr/local/go/src/os/file_unix.go:243 No locals. #7 0x00072ffc in os.(*File).Write (b=..., err=..., f=0x1040c0f0, n=0) at /usr/local/go/src/os/file.go:144 err.data = 0x12c0e8 <fmt.ppFree> "" err.itab = 0x8b7a8 <fmt.Fprintln+20> "\004" ~r2.data = 0x10456014 "" ~r2.itab = 0x0 #8 0x0008b7fc in fmt.Fprintln (a=..., err=..., n=233960, w=...) at /usr/local/go/src/fmt/print.go:255 p = 0x10456080 #9 0x0008b888 in fmt.Println (a=..., err=..., n=0) at /usr/local/go/src/fmt/print.go:264 No locals. #10 0x000916c0 in main.main () at /home/pi/hello.go:6 No locals. On further analysis, I find that segmentation fault is at __kuser_cmpxchg64. I have enabled CONFIG_KUSER_HELPERS=y when building the linux kernel. Any hint please on how to proceed. Best Regards, Sateesh Kalidas
Hi, I assume you are running a Linux user program on L4Linux which causes a segmentation fault of the L4Linux kernel? Further, is this a 32 or 64bit setup? Regards, Matthias. On [13-11-2019 08:45], Sateesh K wrote:
Hi, My setup is as follows: l4linux 4.19.0-l4 Fiasco.OC Raspberry Pi 3 Model B
I am running a helloworld.go program which is causing the following stack trace.
(gdb) bt full #0 0xffff0f60 in ?? () No symbol table info available. #1 0x0001143c in kernelCAS64 () at /usr/local/go/src/sync/atomic/asm_linux_arm.s:112 No locals. #2 0x0001103c in sync/atomic.loadUint64 (addr=0x10442080, val=48) at /usr/local/go/src/sync/atomic/64bit_arm.go:10 No locals. #3 0x00071f44 in internal/poll.(*fdMutex).rwlock (mu=0x10442080, read=false, ~r1=160) at /usr/local/go/src/internal/poll/fd_mutex.go:130 mutexBit.lo = 4 mutexMask.hi = 2147481600 mutexMask.lo = 0 mutexSema = 0x1044208c mutexWait.hi = 2048 mutexWait.lo = 0 #4 0x00072314 in internal/poll.(*FD).writeLock (fd=0x10442080, ~r0=...) at /usr/local/go/src/internal/poll/fd_mutex.go:237 No locals. #5 0x00072a94 in internal/poll.(*FD).Write (fd=0x10442080, p=..., ~r1=0, ~r2=...) at /usr/local/go/src/internal/poll/fd_unix.go:243 n = -1212420096 nn = 118 --Type <RET> for more, q to quit, c to continue without paging--c #6 0x00073958 in os.(*File).write (b=..., err=..., f=0x1040c0f0, n=2729821 44) at /usr/local/go/src/os/file_unix.go:243 No locals. #7 0x00072ffc in os.(*File).Write (b=..., err=..., f=0x1040c0f0, n=0) at /usr/local/go/src/os/file.go:144 err.data = 0x12c0e8 <fmt.ppFree> "" err.itab = 0x8b7a8 <fmt.Fprintln+20> "\004" ~r2.data = 0x10456014 "" ~r2.itab = 0x0 #8 0x0008b7fc in fmt.Fprintln (a=..., err=..., n=233960, w=...) at /usr/local/go/src/fmt/print.go:255 p = 0x10456080 #9 0x0008b888 in fmt.Println (a=..., err=..., n=0) at /usr/local/go/src/fmt/print.go:264 No locals. #10 0x000916c0 in main.main () at /home/pi/hello.go:6 No locals.
On further analysis, I find that segmentation fault is at
__kuser_cmpxchg64.
I have enabled CONFIG_KUSER_HELPERS=y when building the linux kernel.
Any hint please on how to proceed.
Best Regards, Sateesh Kalidas
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Hi, the case for cmpxchg64 is currently not handled, that's why it faults. Could you make me available the go program or at least the code around the call to __kuser_cmpxchg64? Adam On Wed Nov 13, 2019 at 08:45:22 +0530, Sateesh K wrote:
Hi, My setup is as follows: l4linux 4.19.0-l4 Fiasco.OC Raspberry Pi 3 Model B
I am running a helloworld.go program which is causing the following stack trace.
(gdb) bt full #0 0xffff0f60 in ?? () No symbol table info available. #1 0x0001143c in kernelCAS64 () at /usr/local/go/src/sync/atomic/asm_linux_arm.s:112 No locals. #2 0x0001103c in sync/atomic.loadUint64 (addr=0x10442080, val=48) at /usr/local/go/src/sync/atomic/64bit_arm.go:10 No locals. #3 0x00071f44 in internal/poll.(*fdMutex).rwlock (mu=0x10442080, read=false, ~r1=160) at /usr/local/go/src/internal/poll/fd_mutex.go:130 mutexBit.lo = 4 mutexMask.hi = 2147481600 mutexMask.lo = 0 mutexSema = 0x1044208c mutexWait.hi = 2048 mutexWait.lo = 0 #4 0x00072314 in internal/poll.(*FD).writeLock (fd=0x10442080, ~r0=...) at /usr/local/go/src/internal/poll/fd_mutex.go:237 No locals. #5 0x00072a94 in internal/poll.(*FD).Write (fd=0x10442080, p=..., ~r1=0, ~r2=...) at /usr/local/go/src/internal/poll/fd_unix.go:243 n = -1212420096 nn = 118 --Type <RET> for more, q to quit, c to continue without paging--c #6 0x00073958 in os.(*File).write (b=..., err=..., f=0x1040c0f0, n=2729821 44) at /usr/local/go/src/os/file_unix.go:243 No locals. #7 0x00072ffc in os.(*File).Write (b=..., err=..., f=0x1040c0f0, n=0) at /usr/local/go/src/os/file.go:144 err.data = 0x12c0e8 <fmt.ppFree> "" err.itab = 0x8b7a8 <fmt.Fprintln+20> "\004" ~r2.data = 0x10456014 "" ~r2.itab = 0x0 #8 0x0008b7fc in fmt.Fprintln (a=..., err=..., n=233960, w=...) at /usr/local/go/src/fmt/print.go:255 p = 0x10456080 #9 0x0008b888 in fmt.Println (a=..., err=..., n=0) at /usr/local/go/src/fmt/print.go:264 No locals. #10 0x000916c0 in main.main () at /home/pi/hello.go:6 No locals.
On further analysis, I find that segmentation fault is at
__kuser_cmpxchg64.
I have enabled CONFIG_KUSER_HELPERS=y when building the linux kernel.
Any hint please on how to proceed.
Hi Adam, Here is the complete .go program. package main import "fmt" func main() { fmt.Println("hello world from go programming language") } And to answer if it is 32 or 64-bit binary, please see below output of file utility. hello: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, Go BuildID=gC9PK9WBo_ghl7J9XKZw/EXIqZbziicwPf544V9T1/_kdOAvUVOHlv7C5XBtmH/uZiDJIL5HwkKBm2DLtFK, with debug_info, not stripped On Thu, Nov 14, 2019 at 4:02 AM Adam Lackorzynski <adam@os.inf.tu-dresden.de> wrote:
Hi,
the case for cmpxchg64 is currently not handled, that's why it faults. Could you make me available the go program or at least the code around the call to __kuser_cmpxchg64?
Adam
On Wed Nov 13, 2019 at 08:45:22 +0530, Sateesh K wrote:
Hi, My setup is as follows: l4linux 4.19.0-l4 Fiasco.OC Raspberry Pi 3 Model B
I am running a helloworld.go program which is causing the following stack trace.
(gdb) bt full #0 0xffff0f60 in ?? () No symbol table info available. #1 0x0001143c in kernelCAS64 () at /usr/local/go/src/sync/atomic/asm_linux_arm.s:112 No locals. #2 0x0001103c in sync/atomic.loadUint64 (addr=0x10442080, val=48) at /usr/local/go/src/sync/atomic/64bit_arm.go:10 No locals. #3 0x00071f44 in internal/poll.(*fdMutex).rwlock (mu=0x10442080, read=false, ~r1=160) at /usr/local/go/src/internal/poll/fd_mutex.go:130 mutexBit.lo = 4 mutexMask.hi = 2147481600 mutexMask.lo = 0 mutexSema = 0x1044208c mutexWait.hi = 2048 mutexWait.lo = 0 #4 0x00072314 in internal/poll.(*FD).writeLock (fd=0x10442080, ~r0=...) at /usr/local/go/src/internal/poll/fd_mutex.go:237 No locals. #5 0x00072a94 in internal/poll.(*FD).Write (fd=0x10442080, p=..., ~r1=0, ~r2=...) at /usr/local/go/src/internal/poll/fd_unix.go:243 n = -1212420096 nn = 118 --Type <RET> for more, q to quit, c to continue without paging--c #6 0x00073958 in os.(*File).write (b=..., err=..., f=0x1040c0f0, n=2729821 44) at /usr/local/go/src/os/file_unix.go:243 No locals. #7 0x00072ffc in os.(*File).Write (b=..., err=..., f=0x1040c0f0, n=0) at /usr/local/go/src/os/file.go:144 err.data = 0x12c0e8 <fmt.ppFree> "" err.itab = 0x8b7a8 <fmt.Fprintln+20> "\004" ~r2.data = 0x10456014 "" ~r2.itab = 0x0 #8 0x0008b7fc in fmt.Fprintln (a=..., err=..., n=233960, w=...) at /usr/local/go/src/fmt/print.go:255 p = 0x10456080 #9 0x0008b888 in fmt.Println (a=..., err=..., n=0) at /usr/local/go/src/fmt/print.go:264 No locals. #10 0x000916c0 in main.main () at /home/pi/hello.go:6 No locals.
On further analysis, I find that segmentation fault is at
__kuser_cmpxchg64.
I have enabled CONFIG_KUSER_HELPERS=y when building the linux kernel.
Any hint please on how to proceed.
participants (3)
-
Adam Lackorzynski -
Matthias Lange -
Sateesh K