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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org> To: gdb-prs@sourceware.org Subject: [Bug gdb/30562] New: [gdb] FAIL: gdb.threads/watchthreads2.exp: watch x Date: Sun, 18 Jun 2023 09:38:51 +0000 [thread overview] Message-ID: <bug-30562-4717@http.sourceware.org/bugzilla/> (raw) https://sourceware.org/bugzilla/show_bug.cgi?id=30562 Bug ID: 30562 Summary: [gdb] FAIL: gdb.threads/watchthreads2.exp: watch x Product: gdb Version: unknown Status: NEW Severity: normal Priority: P2 Component: gdb Assignee: unassigned at sourceware dot org Reporter: vries at gcc dot gnu.org Target Milestone: --- On a pinebook (debian 9, arm 64-bit kernel, arm 32-bit userland), I ran into: ... FAIL: gdb.threads/watchthreads2.exp: watch x FAIL: gdb.threads/watchthreads2.exp: x watch loop ... First in more detail: ... (gdb) watch x^M Watchpoint 3: x^M (gdb) FAIL: gdb.threads/watchthreads2.exp: watch x ... Basically, the problem is that we get a software rather than hardware watchpoint. We can "fix" this by setting the watchpoint earlier, at the main breakpoint. Alternatively, we can "fix" this in the test-case by allowing the watchpoint to be a software watchpoint. This makes the test-case rather slow (30 sec), but OTOH after commenting out the printf it speeds up significantly (5 sec). I looked into what the different is between setting the watchpoint earlier and later, and the difference is in arm_linux_get_hwbp_cap, where we do: ... if (ptrace (PTRACE_GETHBPREGS, tid, 0, &val) < 0) available = 0; ... and this call returns something < 0 in the case where we set a hw breakpoint. I'd like to investigate this further using ptrace, but I'm not able to install packages. My plan is to install a new OS on the laptop, so I also may lose the ability to reproduce this. -- You are receiving this mail because: You are on the CC list for the bug.
next reply other threads:[~2023-06-18 9:38 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-06-18 9:38 vries at gcc dot gnu.org [this message] 2023-06-21 7:00 ` [Bug gdb/30562] " vries at gcc dot gnu.org 2023-06-21 7:00 ` [Bug tdep/30562] " vries at gcc dot gnu.org 2023-06-23 9:46 ` luis.machado at arm dot com 2023-06-23 9:47 ` luis.machado at arm dot com 2023-06-23 9:48 ` vries at gcc dot gnu.org
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