Re: [PATCH][Resend v2] Fix infinite loop in search_binary_handler()

[Tetsuo Handa]

Richard Weinberger wrote:
> Am Montag 04 Juli 2011, 16:59:32 schrieb Richard Weinberger:
> > Here the second boot log:
> > http://userweb.kernel.org/~rw/boot2.log
> > 
> > The interesting part is:
> > ---cut---
> > VFS: Mounted root (ext2 filesystem) readonly on device 98:0.
> > Calling request_module() swapper 1 /sbin/init 1 3
> > Calling request_module() kworker/u:0 211 /sbin/modprobe 4 3
> > ...
> > Calling request_module() kworker/u:0 8741 /sbin/modprobe 4 3
> > ---cut---
> > 
> > After the last "Calling request_module..." message no more messages appear
> > and the kernel seems to loop for ever.
> > 
> 
> Please ignore this.
> The "Calling request_module..." messages continue for ever.
> In the first case my terminal locked up...
> current->pid also wraps around.
> 
Please note that the each PID is printed for twice.
This means that each thread within the loop tries to create a thread.
Therefore, it will repeat for (1 << MAX_KMOD_CONCURRENT) times.
It is large enough to wrap the PID.
Well, try with smaller MAX_KMOD_CONCURRENT (e.g. 3).

Calling request_module() kworker/u:0 299 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 301 /sbin/modprobe 4 3 **** 301 1st loop
Calling request_module() kworker/u:0 303 /sbin/modprobe 4 3 **** 303 1st loop
Calling request_module() kworker/u:0 305 /sbin/modprobe 4 3 **** 305 1st loop
Calling request_module() kworker/u:0 307 /sbin/modprobe 4 3 **** 307 1st loop
Calling request_module() kworker/u:0 309 /sbin/modprobe 4 3 **** 309 1st loop
request_module: runaway loop modprobe binfmt-464c
Calling request_module() kworker/u:0 309 /sbin/modprobe 4 3 **** 309 2nd loop
request_module: runaway loop modprobe binfmt-464c
Calling request_module() kworker/u:0 307 /sbin/modprobe 4 3 **** 307 2nd loop
Calling request_module() kworker/u:0 311 /sbin/modprobe 4 3 **** 311 1st loop
request_module: runaway loop modprobe binfmt-464c
Calling request_module() kworker/u:0 311 /sbin/modprobe 4 3 **** 311 2nd loop
request_module: runaway loop modprobe binfmt-464c
Calling request_module() kworker/u:0 305 /sbin/modprobe 4 3 **** 305 2nd loop
Calling request_module() kworker/u:0 313 /sbin/modprobe 4 3 **** 313 1st loop
Calling request_module() kworker/u:0 315 /sbin/modprobe 4 3 **** 315 1st loop
request_module: runaway loop modprobe binfmt-464c
Calling request_module() kworker/u:0 315 /sbin/modprobe 4 3 **** 315 2nd loop
Calling request_module() kworker/u:0 313 /sbin/modprobe 4 3 **** 313 2nd loop
Calling request_module() kworker/u:0 317 /sbin/modprobe 4 3 **** 317 1st loop
Calling request_module() kworker/u:0 317 /sbin/modprobe 4 3 **** 317 2nd loop
Calling request_module() kworker/u:0 303 /sbin/modprobe 4 3 **** 303 2nd loop
Calling request_module() kworker/u:0 319 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 321 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 323 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 323 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 321 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 325 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 325 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 319 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 327 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 329 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 329 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 327 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 331 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 331 /sbin/modprobe 4 3
Calling request_module() kworker/u:0 301 /sbin/modprobe 4 3 **** 301 2nd loop
Calling request_module() kworker/u:0 333 /sbin/modprobe 4 3
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