[PING 2][PATCH 1/1] gdb, infcall, breakpoint: Handle cycles in conditional expr evaluation

[PING 2][PATCH 1/1] gdb, infcall, breakpoint: Handle cycles in conditional expr evaluation

[Bouhaouel, Mohamed]

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Kindly pinging.

Thanks!

--Mohamed



________________________________
From: Mohamed Bouhaouel
Sent: Friday, October 2, 2026 4:35 PM
To: gdb-patches@sourceware.org
Cc: abdul.b.ijaz@intel.com; mohamed.bouhaouel@intel.com
Subject: Re: [PATCH 1/1] gdb, infcall, breakpoint: Handle cycles in conditional expr evaluation

Take the following scenario: (gdb) break foo if foo (1) == 2 (gdb) run The program stops at 'foo', then GDB tries to evaluate the condition. The condition triggers an inferior call of 'foo', which causes a stop at 'foo' again, and GDB is stuck in this infinite cycle. The same issue exists also for indirect cycles, e.g., (gdb) break foo if bar (1) (gdb) break bar if foo (1) (gdb) run To avoid this, check for cycles just before evaluating a breakpoint condition. If a breakpoint is hit again while its own condition is being evaluated, the evaluation of that condition is aborted with an error message. With the patch, the behavior becomes: (gdb) break foo if foo (1) == 2 Breakpoint 2 at 0x55555555514c: file infcall-from-bp-cond-cycle.c, line 27. (gdb) continue Continuing. Error in testing condition for breakpoint 2: Aborting expression evaluation for the conditional bp: A cycle was detected during the evaluation. Breakpoint 2, foo (a=1) at infcall-from-bp-cond-cycle.c:27 27 return a + add_one (a); Error in testing condition for breakpoint 2: The program being debugged stopped while in a function called from GDB. Evaluation of the expression containing the function (foo) will be abandoned. When the function is done executing, GDB will silently stop. (gdb) backtrace #0 foo (a=1) at infcall-from-bp-cond-cycle.c:27 #1
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