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From: Thomas Gleixner <tglx@linutronix.de>
To: Ondrej Zary <linux@zary.sk>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: IOPL emulation breaks hpasmd (hp-health) needed by HP DL380 G4 servers
Date: Thu, 16 Sep 2021 23:25:17 +0200	[thread overview]
Message-ID: <87h7ek9ps2.ffs@tglx> (raw)
In-Reply-To: <202109162227.17415.linux@zary.sk>

On Thu, Sep 16 2021 at 22:27, Ondrej Zary wrote:
> On Thursday 16 September 2021 19:09:31 Thomas Gleixner wrote:
>> Can you please run that failing program with GDB and figure out which
>> instruction causes #GP and what the register content is.
>
> (gdb) run
> Starting program: /opt/hp/hp-health/bin/IrqRouteTbl
>
> Program received signal SIGSEGV, Segmentation fault.
> 0xf7fc509b in ?? ()
> (gdb) bt
> #0  0xf7fc509b in ?? ()
> #1  0x08048848 in ?? ()
> #2  0x08048aa1 in ?? ()
> #3  0x08048e05 in ?? ()
> #4  0xf7df9e46 in __libc_start_main () from /lib32/libc.so.6
> #5  0xf7ffd000 in ?? () from /lib/ld-linux.so.2
> Backtrace stopped: previous frame inner to this frame (corrupt stack?)
> (gdb) x/3i $pc
> => 0xf7fc509b:  cli
>    0xf7fc509c:  push   %ebp
>    0xf7fc509d:  mov    %esp,%ebp
>
> OMG, maybe is it calling into the mmapped BIOS area?

Pretty much so. From your initial report:

openat(AT_FDCWD, "/dev/mem", O_RDWR)    = 3
mmap2(NULL, 8342, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED, 3, 0xf0000) = 0xf7fc1000
close(3)                                = 0
iopl(3)                                 = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=NULL} ---

offset 0xf0000 of /dev/mem is clearly the BIOS area. Daft.

That's really qualiteee stuff.

Thanks,

        tglx

      parent reply	other threads:[~2021-09-16 21:25 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-15 12:23 IOPL emulation breaks hpasmd (hp-health) needed by HP DL380 G4 servers Ondrej Zary
2021-09-16 17:09 ` Thomas Gleixner
2021-09-16 20:27   ` Ondrej Zary
2021-09-16 21:05     ` Peter Zijlstra
2021-09-17  8:11       ` Ondrej Zary
2021-09-17  9:20         ` [PATCH] x86/iopl: Fake iopl(3) CLI/STI usage Peter Zijlstra
2021-09-17 10:29           ` Ondrej Zary
2021-09-17 11:54             ` Peter Zijlstra
2021-09-17 12:33               ` Thomas Gleixner
2021-09-17 12:54                 ` Ondrej Zary
2021-09-17 10:40           ` Thomas Gleixner
2021-09-17 22:23           ` Linus Torvalds
2021-09-17 22:24             ` Linus Torvalds
2021-09-18  7:05               ` Peter Zijlstra
2021-09-18  9:06                 ` Peter Zijlstra
2021-09-18 15:53                   ` Ondrej Zary
2021-09-18 16:35                   ` Linus Torvalds
2021-09-21  7:28                   ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2021-09-21 11:09                     ` Ondrej Zary
2021-09-21 12:00                       ` Peter Zijlstra
2021-09-21 17:31                         ` Ondrej Zary
2021-09-21 12:41                   ` tip-bot2 for Peter Zijlstra
2021-09-21 21:01                 ` [PATCH] " Andy Lutomirski
2021-09-16 21:25     ` Thomas Gleixner [this message]

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