[Bug 274535] vlc(1) from Focal hangs on futex
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535 Edward Tomasz Napierala changed: What|Removed |Added Blocks||247219 Referenced Bugs: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247219 [Bug 247219] [meta] Linux Emulation (Linuxulator) Tracking Issue -- You are receiving this mail because: You are the assignee for the bug.
[Bug 274535] vlc(1) from Focal hangs on futex
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535 --- Comment #6 from Edward Tomasz Napierala --- I'm not sure. I've redone the strace (https://people.freebsd.org/~trasz/vlc.txt) and also added ktrace (https://people.freebsd.org/~trasz/vlc-ktrace.txt), just in case. -- You are receiving this mail because: You are the assignee for the bug.
[Bug 274535] vlc(1) from Focal hangs on futex
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535 --- Comment #5 from Dmitry Chagin --- (In reply to Edward Tomasz Napierala from comment #4) Well, the trace is weird as I don’t see any wake call on 0x10b75b0 futex. strace -f? or ktrace -di to see any childs. -- You are receiving this mail because: You are the assignee for the bug.
[Bug 274535] vlc(1) from Focal hangs on futex
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535 --- Comment #4 from Edward Tomasz Napierala --- Also, I've tested the patch at D40481, just in case, and predictably it doesn't change anything wrt VLC or glxinfo hanging on futex. -- You are receiving this mail because: You are the assignee for the bug.
[Bug 274535] vlc(1) from Focal hangs on futex
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535 --- Comment #3 from Edward Tomasz Napierala --- I don't think so; just in case I've put the full strace output at https://people.freebsd.org/~trasz/vlc.txt -- You are receiving this mail because: You are the assignee for the bug.
[Bug 274535] vlc(1) from Focal hangs on futex
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535 --- Comment #2 from Gleb Smirnoff --- The panic fixed by D40481 happens on futex syscall with FUTEX_REQUEUE flag. Here we don't have it, neither we have a panic. Edward, are there any FUTEX_REQUEUE requests in the entire strace/ktrace history? -- You are receiving this mail because: You are the assignee for the bug.
[Bug 274535] vlc(1) from Focal hangs on futex
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274535 Mark Johnston changed: What|Removed |Added Status|New |Open CC||dcha...@freebsd.org, ||gleb...@freebsd.org, ||ma...@freebsd.org --- Comment #1 from Mark Johnston --- Hmm, maybe related to https://reviews.freebsd.org/D40481 ? -- You are receiving this mail because: You are the assignee for the bug.
[Bug 274535] vlc(1) from Focal hangs on futex
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
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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