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Date: Tue, 21 Aug 2018 18:39:58 +0900 From: Masami Hiramatsu <mhiramat@...nel.org> To: Ingo Molnar <mingo@...hat.com> Cc: "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>, Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>, "David S . Miller" <davem@...emloft.net>, Masami Hiramatsu <mhiramat@...nel.org>, linux-kernel@...r.kernel.org Subject: [PATCH -tip 5/5] kprobes: Don't call BUG_ON if there is a kprobe in use on free list Instead of calling BUG_ON, if we find a kprobe in use on free kprobe list, just remove it from the list and keep it on kprobe hash list as same as other in-use kprobes. Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org> --- kernel/kprobes.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 63c342e5e6c3..e3420364b415 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -546,8 +546,14 @@ static void do_free_cleaned_kprobes(void) struct optimized_kprobe *op, *tmp; list_for_each_entry_safe(op, tmp, &freeing_list, list) { - BUG_ON(!kprobe_unused(&op->kp)); list_del_init(&op->list); + if (!kprobe_unused(&op->kp)) { + /* + * This must not happen, but if there is a kprobe + * still in use, keep it on kprobes hash list. + */ + continue; + } free_aggr_kprobe(&op->kp); } }
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