l4linux signals SIGSEGV instead of SIGILL and others

[Martin Schröder]

Am 26.01.2014 15:59, schrieb Adam Lackorzynski:
> Do you have CONFIG_VFP enabled in either Linux version?

normally not, but CONFIG_VFP crashes both qemu (arm-rv-arm9):
> VFS: Mounted root (ext2 filesystem) readonly on device 1:0.
> Freeing unused kernel memory: 112K (022ab000 - 022c7000)
> 0: 00000000 00000040 00000040 00000000  4: 00000040 00000000 bfa86f0c 00000000
> 8: 00000000 00000000 00000000 00000000 12: 40000000 bfa86da0 00160c54 0016b6cc
> CPSR: 20000010 Err: 00100000
>  sh/1: Undefined instruction at 0016b6cc with content eef11a10, err 00100000
> 00008000 - 001f8000 r-xp 00000 /bin/busybox <==== (0x1636cc)
> 001f8000 - 001f9000 rwxp 001f0 /bin/busybox
> 001f9000 - 001ff000 rwxp
> b7b28000 - b7b29000 r-xp
> bfa65000 - bfa87000 rw-p
> 0: 00000000 00000040 00000040 00000000  4: 00000040 00000000 bfa86f0c 00000000
> 8: 00000000 00000000 00000000 00000000 12: 40000000 bfa86da0 00160c54 0016b6cc
> CPSR: 20000010 Err: 00100000
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
>
> CPU: 0 PID: 1 Comm: sh Not tainted 3.12.0-l4 #1
> [<0200c264>] (unwind_backtrace+0x0/0xf0) from [<020054b0>] (show_stack+0x10/0x14)
> [<020054b0>] (show_stack+0x10/0x14) from [<021f3a2c>] (panic+0x78/0x1b8)
> [<021f3a2c>] (panic+0x78/0x1b8) from [<0201d64c>] (do_exit+0x6b8/0x7c8)
> [<0201d64c>] (do_exit+0x6b8/0x7c8) from [<0201d828>] (do_group_exit+0x3c/0xa0)
> [<0201d828>] (do_group_exit+0x3c/0xa0) from [<020271a8>] (get_signal_to_deliver+0x18c/0x478)
> [<020271a8>] (get_signal_to_deliver+0x18c/0x478) from [<020069b4>] (do_signal+0x78/0x3d8)
> [<020069b4>] (do_signal+0x78/0x3d8) from [<02003a48>] (l4x_deliver_signal+0xc8/0xd8)
> [<02003a48>] (l4x_deliver_signal+0xc8/0xd8) from [<020090ac>] (l4x_vcpu_entry_c+0x6e8/0x2468)
> [<020090ac>] (l4x_vcpu_entry_c+0x6e8/0x2468) from [<00160c54>] (0x160c54)
> panic: going to sleep forever, bye
> l4linux | panic: going to sleep forever, bye
> qemu: terminating on signal 2
> make: *** [qemu] Unterbrechung


as well as real HW (i.MX28 EVK):
> CPU: Testing write buffer coherency: ok
> Setting up static identity map for 0x02225fb0 - 0x02225fb0
> devtmpfs: initialized
> l4linux | Copro10/11 access (FPU), invalid, will oops
> 0: 00000000 00000000 00000002 022ec4c8  4: 06c28000 0230e2f8 022ec3b4 0232c000
> 8: 00000043 02300bd4 022e618c 00000000 12: 00000064 06c29ee8 022ec3ec 020031b0
> CPSR: 80000013 Err: 00000000
> l4linux | Non-resolvable page fault at 141, ip 20cded8.
> l4linux | Page fault (non-resolved): pfa=141 pc=20cded8
> l4linux | Non-resolvable page fault at 146, ip 20cded8.
> Internal error: Boom!: 410007 [#1] ARM
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0-l4 #12
> task: 06c27be0 ti: 06c28000 task.ti: 06c28000
> PC is at do_coredump+0x38/0xdcc
> LR is at get_signal_to_deliver+0x170/0x448


Martin