From: Vladimir Riabchun <ferr.lambarginio@gmail.com> stable inclusion from stable-v6.6.119 commit e81e6d6d99b16dae11adbeda5c996317942a940c category: bugfix bugzilla: http://atomgit.com/src-openeuler/kernel/issues/11609 CVE: CVE-2025-68173 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 4099b98203d6b33d990586542fa5beee408032a3 ] A soft lockup was observed when loading amdgpu module. If a module has a lot of tracable functions, multiple calls to kallsyms_lookup can spend too much time in RCU critical section and with disabled preemption, causing kernel panic. This is the same issue that was fixed in commit d0b24b4e91fc ("ftrace: Prevent RCU stall on PREEMPT_VOLUNTARY kernels") and commit 42ea22e754ba ("ftrace: Add cond_resched() to ftrace_graph_set_hash()"). Fix it the same way by adding cond_resched() in ftrace_module_enable. Link: https://lore.kernel.org/aMQD9_lxYmphT-up@vova-pc Signed-off-by: Vladimir Riabchun <ferr.lambarginio@gmail.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Tengda Wu <wutengda2@huawei.com> --- kernel/trace/ftrace.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 15785a729a0c..398992597685 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -6873,6 +6873,8 @@ void ftrace_module_enable(struct module *mod) if (!within_module(rec->ip, mod)) break; + cond_resched(); + /* Weak functions should still be ignored */ if (!test_for_valid_rec(rec)) { /* Clear all other flags. Should not be enabled anyway */ -- 2.34.1