Shortest code that throws SIGBUS [duplicate]

Question

We've had challenges for SIGSEGV and SIGILL so why not...

Write the shortest code that results in a Bus Error (SIGBUS) in any programming language.

Your program can't call raise() or kill(getpid(),sig) or pthread_kill(pthread_self(),sig), or any other equivalent.

@ГригорийПерельман It's not a duplicate, no answer for that challenge can be applied to this one without nontrivial modification. — orlp, Commented Mar 21, 2017 at 6:25
@orlp There are Bash, Python, Perl, and C answers that are all essentially raise(11). They can be trivially modified to be raise(7) instead for this challenge. — user45941, Commented Mar 21, 2017 at 6:55
Java/Groovy is also just System.exit(#); where you only change the # to throw a different exit code... This is a very trivial difference in many languages. — Magic Octopus Urn, Commented Mar 21, 2017 at 19:29
Voting to reopen because the rule "Your program can't call raise() or kill(getpid(),sig) or pthread_kill(pthread_self(),sig), or any other equivalent." bans those copy-paste answers. — The Fifth Marshal, Commented Feb 17, 2020 at 22:32

orlp · Accepted Answer · 2017-03-21 06:37:14Z

6

x86_64 bytecode, 15 bytes

   0:   c7 04 24 00 00 04 00    movl   $0x40000,(%rsp)
   7:   9d                      popfq  
   8:   8b 04 25 01 00 00 00    mov    0x1,%eax

Turns on the misaligned address trap flag and then immediately triggers it.

answered Mar 21, 2017 at 6:37

orlp

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