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[SR-2929] Segfault only when running swift in system-wide directory #45523

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swift-ci opened this issue Oct 12, 2016 · 8 comments
Open

[SR-2929] Segfault only when running swift in system-wide directory #45523

swift-ci opened this issue Oct 12, 2016 · 8 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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@swift-ci
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Previous ID SR-2929
Radar None
Original Reporter dowobeha (JIRA User)
Type Bug

Attachment: Download

Environment

$ uname -a
Linux 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:42:33 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Additional Detail from JIRA
Votes 0
Component/s
Labels Bug
Assignee None
Priority Medium

Watchers: @shahmishal

md5: 258159ac7c9dad1429a1e8c2048fa9f8

Issue Description:

I'm on Ubuntu 16, and just downloaded the latest Swift package. When I run swift from /opt (installed using sudo) as a normal user, I get a segfault. When I run it from /opt as root, no problems. When I run from my home dir as a normal user, things are fine.

Run swift (installed in /opt using sudo) as local user - I get a segfault.

lanes:~$ /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/swift
Welcome to Swift version 3.0.1 (swift-3.0.1-PREVIEW-2). Type :help for assistance.
1> print("Hello")
Segmentation fault (core dumped)

Run swift (installed in home dir) as local user - everything is fine.

lanes:~$ ~/Downloads/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/swift
Welcome to Swift version 3.0.1 (swift-3.0.1-PREVIEW-2). Type :help for assistance.
1> print("Hello")
Hello

Run swift (installed in /opt using sudo) as root - everything is fine.

root:~# /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/swift
Welcome to Swift version 3.0.1 (swift-3.0.1-PREVIEW-2). Type :help for assistance.
1> print("Hello")
Hello
@shahmishal
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Can you please provide the Segmentation fault error?

@swift-ci
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Comment by Lane Schwartz (JIRA)

Thread 8 "io-handler" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffd2933700 (LWP 6389)]
0x00007ffff455f577 in llvm::verifyModule(llvm::Module const&, llvm::raw_ostream*, bool*) () from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
(gdb) bt
#​0  0x00007ffff455f577 in llvm::verifyModule(llvm::Module const&, llvm::raw_ostream*, bool*) () from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#​1  0x00007ffff64b8184 in LLVMVerifyModule () from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#​2  0x00007ffff4a794ba in lldb_private::SwiftExpressionParser::Parse(lldb_private::DiagnosticManager&, unsigned int, unsigned int, unsigned int) ()
from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#​3  0x00007ffff4a718f0 in lldb_private::SwiftUserExpression::Parse(lldb_private::DiagnosticManager&, lldb_private::ExecutionContext&, lldb_private::ExecutionPolicy, bool, bool, unsigned int) ()
from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#&#8203;4  0x00007ffff4713f2c in lldb_private::UserExpression::Evaluate(lldb_private::ExecutionContext&, lldb_private::EvaluateExpressionOptions const&, char const*, char const*, lldb_private::SharingPtr<lldb_private::ValueObject>&, lldb_private::Error&, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, std::shared_ptr<lldb_private::Module>*) ()
from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#&#8203;5  0x00007ffff4711bb9 in lldb_private::REPL::IOHandlerInputComplete(lldb_private::IOHandler&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) ()
from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#&#8203;6  0x00007ffff46797f7 in lldb_private::IOHandlerEditline::Run() () from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#&#8203;7  0x00007ffff4662a90 in lldb_private::Debugger::ExecuteIOHandlers() () from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#&#8203;8  0x00007ffff466673f in lldb_private::Debugger::IOHandlerThread(void*) () from /opt/swift-3.0.1-PREVIEW-2-ubuntu16.04/usr/bin/../lib/liblldb.so.3.9.0
#&#8203;9  0x00007ffff29cd6fa in start_thread (arg=0x7fffd2933700) at pthread_create.c:333
#&#8203;10 0x00007ffff1e62b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

@swift-ci
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Comment by Lane Schwartz (JIRA)

Also note: doing a chown -R to a non-root user on the relevant directory also works around the issue. But that shouldn't be necessary.

@martinr448
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The reason for the crash seems to be that all files in the usr/lib/swift/CoreFoundation subdirectory can only be read by "root". This is already wrong in the TAR archive:

$ tar tvzf swift-3.0.1-RELEASE-ubuntu16.04.tar.gz | grep CoreFoundation 
drwxr-xr-x root/root         0 2016-10-29 04:10 swift-3.0.1-RELEASE-ubuntu16.04/usr/lib/swift/CoreFoundation/
-rw-r----- root/root      8945 2016-10-29 04:10 swift-3.0.1-RELEASE-ubuntu16.04/usr/lib/swift/CoreFoundation/CFLocale.h
-rw-r----- root/root      5247 2016-10-29 04:10 swift-3.0.1-RELEASE-ubuntu16.04/usr/lib/swift/CoreFoundation/CFStringEncodingConverterExt.h
-rw-r----- root/root      2067 2016-10-29 04:10 swift-3.0.1-RELEASE-ubuntu16.04/usr/lib/swift/CoreFoundation/CFStringEncodingConverterPriv.h
-rw-r----- root/root      5772 2016-10-29 04:10 swift-3.0.1-RELEASE-ubuntu16.04/usr/lib/swift/CoreFoundation/CFPlugIn.h
...

Adding the read-permission for "other" fixes the issue:

# chmod -R o+r swift-3.0.1-RELEASE-ubuntu16.04/usr/lib/swift/CoreFoundation/

This should probably be fixed where the TAR archive is created.

@swift-ci
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Comment by Lane Schwartz (JIRA)

Has this been addressed in newer releases?

@martinr448
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Apparently this has been fixed in newer releases. I cannot reproduce the problem anymore, and the permissions in the TAR archive look good:

$ tar tvzf swift-4.2-RELEASE-ubuntu18.04.tar.gz | grep CoreFoundation
-rw-r--r-- root/root      4441 2018-09-13 03:14 swift-4.2-RELEASE-ubuntu18.04/usr/lib/swift/shims/CoreFoundationShims.h
-rw-r--r-- root/root      1038 2018-09-13 03:14 swift-4.2-RELEASE-ubuntu18.04/usr/lib/swift/shims/CoreFoundationOverlayShims.h
drwxr-xr-x root/root         0 2018-09-13 03:43 swift-4.2-RELEASE-ubuntu18.04/usr/lib/swift/CoreFoundation/
-rw-r--r-- root/root      4514 2018-09-13 03:43 swift-4.2-RELEASE-ubuntu18.04/usr/lib/swift/CoreFoundation/CFPlugInCOM.h
-rw-r--r-- root/root     17578 2018-09-13 03:43 swift-4.2-RELEASE-ubuntu18.04/usr/lib/swift/CoreFoundation/CFURL.inc.h
-rw-r--r-- root/root      1953 2018-09-13 03:43 swift-4.2-RELEASE-ubuntu18.04/usr/lib/swift/CoreFoundation/CFKnownLocations.h
...

@swift-ci
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Comment by Lane Schwartz (JIRA)

This problem is still present in swift-4.2.2-RELEASE-ubuntu16.04.tar.gz

@swift-ci
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Comment by Lane Schwartz (JIRA)

The workaround is to do the following as root:

$ sudo chmod -R a+r swift-4.2.2-RELEASE-ubuntu16.04

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@shahmishal @martinr448 @swift-ci