https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535
Bug ID: 274535
Summary: vlc(1) from Focal hangs on futex
Product: Base System
Version: 15.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: tr...@freebsd.org
VLC from amd64 Ubuntu Focal "hangs" on futex on startup. VLC from a previous
version (Bionic) doesn't exhibit this problem.
Running under strace(1) shows the following:
mmap(NULL, 16488, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x804f88000
mmap(0x804f89000, 4096, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x1000) = 0x804f89000
mmap(0x804f8a000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4,
0x2000) = 0x804f8a000
mmap(0x804f8b000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x2000) = 0x804f8b000
close(4) = 0
mprotect(0x804f8b000, 4096, PROT_READ) = 0
futex(0x80224ede8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x10b75b0, FUTEX_WAIT_BITSET_PRIVATE, 0, {tv_sec=0, tv_nsec=0},
FUTEX_BITSET_MATCH_ANYstrace: detach: tkill(2718,0): Invalid argument
strace: Process 2718 detached
<detached ...>
Note that there are other applications hanging on futex, notably glxinfo(1).
The strange thing is, the same glxinfo works when run under strace(1) or
FreeBSD's native ktrace(1). Race condition of some kind?
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