floppy hang with 2.4.9-ac1x

floppy hang with 2.4.9-ac1x

[thunder7]

Using mtools, such as mdir and mformat, under 2.4.9-ac16 (from
2.4.9-ac10 onwards, IIRC) hard-hangs my linux system....

dual P3/700, SMP kernel, gcc-3.0.1, Abit VP6 with VIA 694X chipset,
mtools-3.9.7

dmesg about the floppy:

Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077

/proc/dma:
 4: cascade

/proc/interrupts:

           CPU0       CPU1       
  0:      42356      44396    IO-APIC-edge  timer
  1:       2122       3557    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  8:          0          3    IO-APIC-edge  rtc
 14:       6150       3406    IO-APIC-edge  ide0
 16:         33         32   IO-APIC-level  sym53c8xx
 17:         23         21   IO-APIC-level  sym53c8xx, sym53c8xx, EMU10K1
 18:      12680      12663   IO-APIC-level  ide2, ide3, DE500-AA (eth0)
 19:          0          0   IO-APIC-level  usb-uhci, usb-uhci
NMI:          0          0 
LOC:      86651      86651 
ERR:          0
MIS:          0

The floppy-drive itself functions quite well in DOS, so it's not that.

The symptoms are easy to describe:

the console hangs, and switching to another doesn't work. Also the
num-lock key is dead. The floppy light stays on, but it doesn't sound
like it is doing anything but spinning the motor.
There are no messages in the system logs.

Any hints on what to do?

Thanks,
Jurriaan
-- 
Cadets were humping in the corridors, a party of outraged Senators roamed
Krane barracks, everyone, including me, questioned orders, ...
Law and order.
	David Feintuch - Fisherman's Hope.
GNU/Linux 2.4.9-ac16 SMP/ReiserFS 2x1402 bogomips load av: 0.00 0.03 0.04

Re: floppy hang with 2.4.9-ac1x

[Alan Cox]

> 2.4.9-ac10 onwards, IIRC) hard-hangs my linux system....

Knowing exactly which release would be useful

> dual P3/700, SMP kernel, gcc-3.0.1, Abit VP6 with VIA 694X chipset,
> mtools-3.9.7

Does it occur with gcc 2.95/2.96 ?

> the console hangs, and switching to another doesn't work. Also the
> num-lock key is dead. The floppy light stays on, but it doesn't sound
> like it is doing anything but spinning the motor.
> There are no messages in the system logs.
> 
> Any hints on what to do?

Try an older gcc to eliminate that case (I dont think it is the guilty party
but I dont trust the memory barriers in such an old ugly driver to be right)
and then find out which precise release broke it

Alan

Re: (lkml)Re: floppy hang with 2.4.9-ac1x

[thunder7]

On Fri, Sep 28, 2001 at 11:21:42PM +0100, Alan Cox wrote:
> > 2.4.9-ac10 onwards, IIRC) hard-hangs my linux system....
> 
> Knowing exactly which release would be useful

It worked with 2.4.9-ac15 and before, and it doesn't work with
2.4.9-ac16.

> 
> > dual P3/700, SMP kernel, gcc-3.0.1, Abit VP6 with VIA 694X chipset,
> > mtools-3.9.7
> 
> Does it occur with gcc 2.95/2.96 ?

yes, 2.4.9-ac16 crashes both with gcc-3.0.1 and with gcc-2.95.2.

> 
> > the console hangs, and switching to another doesn't work. Also the
> > num-lock key is dead. The floppy light stays on, but it doesn't sound
> > like it is doing anything but spinning the motor.
> > There are no messages in the system logs.
> > 
> > Any hints on what to do?
> 
> Try an older gcc to eliminate that case (I dont think it is the guilty party
> but I dont trust the memory barriers in such an old ugly driver to be right)
> and then find out which precise release broke it
> 
It's 2.4.9-ac16 that broke it, and I've straced it. This is in
2.4.9-ac15:

open("/home/jurriaan/.mtoolsrc", O_RDONLY) = -1 ENOENT (No such file or directory)
rt_sigaction(SIGHUP, {0x805ff50, [HUP], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGINT, {0x805ff50, [INT], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGTERM, {0x805ff50, [TERM], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGQUIT, {0x805ff50, [QUIT], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
stat64("/home/jurriaan/.mcwd", 0xbffff37c) = -1 ENOENT (No such file or directory)
open("/dev/fd0", O_RDONLY|O_EXCL|O_LARGEFILE) = 4
fstat64(4, {st_mode=S_IFBLK|0660, st_rdev=makedev(2, 0), ...}) = 0
flock(4, LOCK_SH|LOCK_NB)               = 0
ioctl(4, FDGETPRM, 0xbfffddd0)          = 0
read(4, "\353V\220DRDOS  7\0\2\1\1\0\2\340\0@\v\360\t\0\22\0\2\0"..., 256) = 256
ioctl(4, FDGETPRM, 0xbfffe5e0)          = 0
old_mmap(NULL, 151552, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4014d000
brk(0x8075000)                          = 0x8075000
_llseek(4, 512, [512], SEEK_SET)        = 0
read(4, "\360\377\377\3@\0\5`\0\7\200\0\t\240\0\v\300\0\r\340\0"..., 17920) = 17920
open("/etc/localtime", O_RDONLY)        = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=1058, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000
read(5, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\v\0\0\0\v\0"..., 4096) = 1058
close(5)                                = 0

and in 2.4.9-ac16 I see:

open("/home/jurriaan/.mtoolsrc", O_RDONLY) = -1 ENOENT (No such file or directory)
rt_sigaction(SIGHUP, {0x805ff50, [HUP], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGINT, {0x805ff50, [INT], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGTERM, {0x805ff50, [TERM], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGQUIT, {0x805ff50, [QUIT], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
stat64("/home/jurriaan/.mcwd", 0xbffff37c) = -1 ENOENT (No such file or directory)
open("/dev/fd0", O_RDONLY|O_EXCL|O_LARGEFILE) = 4
fstat64(4, {st_mode=S_IFBLK|0660, st_rdev=makedev(2, 0), ...}) = 0
flock(4, LOCK_SH|LOCK_NB)               = 0
ioctl(4, FDGETPRM, 0xbfffddd0)          = 0
read(4, "\353V\220DRDOS  7\0\2\1\1\0\2\340\0@\v\360\t\0\22\0\2\0"..., 256) = 256
ioctl(4, FDGETPRM, 0xbfffe5e0)          = 0
old_mmap(NULL, 151552, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4014d000
brk(0x8075000)                          = 0x8075000
_llseek(4, 512, [512], SEEK_SET)        = 0
read(4,

and there it hangs. Also, in 2.4.9-ac16 it is reading from fd 3 for some
reason, but I couldn't quite see why. The values in the ioctl lines etc.
are the same. Exchanging mtools-3.9.7 with 3.9.8-pre6 (the latest
release) didn't change anything.

Good luck,
Jurriaan



-- 
Whoever thought that one up should have his head examined. Bloody minstrels...
	Simon R Green - Blue Moon Rising
GNU/Linux 2.4.9-ac16 SMP/ReiserFS 2x1402 bogomips load av: 0.57 0.15 0.05

Re: (lkml)Re: floppy hang with 2.4.9-ac1x

[Alan Cox]

> > Knowing exactly which release would be useful
> 
> It worked with 2.4.9-ac15 and before, and it doesn't work with
> 2.4.9-ac16.

Ok that sounds like another instance of the Ingo ksoftirq changes breaking
stuff - thanks