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POWhat are the possible causes of "BUG: scheduling while atomic?"
 

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  1. POWhat are the possible causes of "BUG: scheduling while atomic?"
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    <p>There is another process continuously creating files that need processing by this code. This code constantly scans the file-system for new files that need processing by comparing the contents of the file-system against a sqlite database that contains the processing results - one record for each file. This process is running at <code>nice -n 19</code> so as not to interfere with the creation of new files by the other process. It all works perfectly for a large number (>1k) of files, but then blows up with <code>BUG: scheduling while atomic</code>. According to <a href="https://stackoverflow.com/questions/3537252/how-to-solve-bug-scheduling-while-atomic-swapper-0x00000103-0-cpu0-in-ts">this</a> </p> <blockquote> <p>"Scheduling while atomic" indicates that you've tried to sleep somewhere that you shouldn't</p> </blockquote> <p>But the only sleep in the code is like this</p> <pre><code>void doFiles(void) { for (...) { // for each file in the file-system ... // check database - do processing if needed } sleep(1); } int main(int argc, char *argv[], char *envp[]) { while (true) doFiles(); return -1; } </code></pre> <p>The code will hit this sleep after it has checked every file in the file-system against the database. The process needs to be repeated since new files will be added from time to time. There is no multi-threading in this code. Are there other possible causes for "BUG: scheduling while atomic" besides a misplaced sleep?</p> <p>Edit: additional error output:</p> <pre><code>note: mirlin[1083] exited with preempt_count 1 BUG: scheduling while atomic: mirlin/1083/0x40000002 Modules linked in: g_cdc_ms musb_hdrc nop_usb_xceiv irqk edmak dm365mmap cmemk Backtrace: [&lt;c002a5a0&gt;] (dump_backtrace+0x0/0x110) from [&lt;c028e56c&gt;] (dump_stack+0x18/0x1c) r6:c1099460 r5:c04ea000 r4:00000000 r3:20000013 [&lt;c028e554&gt;] (dump_stack+0x0/0x1c) from [&lt;c00337b8&gt;] (__schedule_bug+0x58/0x64) [&lt;c0033760&gt;] (__schedule_bug+0x0/0x64) from [&lt;c028e864&gt;] (schedule+0x84/0x378) r4:c10992c0 r3:00000000 [&lt;c028e7e0&gt;] (schedule+0x0/0x378) from [&lt;c0033a80&gt;] (__cond_resched+0x28/0x38) [&lt;c0033a58&gt;] (__cond_resched+0x0/0x38) from [&lt;c028ec6c&gt;] (_cond_resched+0x34/0x44) r4:00013000 r3:00000001 [&lt;c028ec38&gt;] (_cond_resched+0x0/0x44) from [&lt;c0082f64&gt;] (unmap_vmas+0x570/0x620) [&lt;c00829f4&gt;] (unmap_vmas+0x0/0x620) from [&lt;c0085c10&gt;] (exit_mmap+0xc0/0x1ec) [&lt;c0085b50&gt;] (exit_mmap+0x0/0x1ec) from [&lt;c0037610&gt;] (mmput+0x40/0xfc) r9:00000001 r8:80000005 r6:c04ea000 r5:00000000 r4:c0427300 [&lt;c00375d0&gt;] (mmput+0x0/0xfc) from [&lt;c003b5e4&gt;] (exit_mm+0x150/0x158) r5:c10992c0 r4:c0427300 [&lt;c003b494&gt;] (exit_mm+0x0/0x158) from [&lt;c003cd44&gt;] (do_exit+0x198/0x67c) r7:c03120d1 r6:c10992c0 r5:0000000b r4:c10992c0 ... </code></pre>
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    1. COHuh. Is any of your code kernel code, like your own kernel module or anything? As far as I'm aware, all userspace code can `sleep` whenever it wants...
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      1. POWhat are the possible causes of "BUG: scheduling while atomic?"
      1. USus2012
    2. CO`BUG: scheduling while atomic` has nothing to do with user-level application code. That's kernel code, so either it's a bug with the kernel distributed with your particular Linux flavor, or with your own custom-configured kernel if you've done that, or with a driver/module that you have involved - standard, third-party, or your own...
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      1. POWhat are the possible causes of "BUG: scheduling while atomic?"
      1. UStwalberg
    3. CO@us2012 No. The kernel is linux-2.6.32.17-psp03.01.01.39 and there is no kernel code in the process identified by the `scheduling while atomic` message.
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      1. POWhat are the possible causes of "BUG: scheduling while atomic?"
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