diff --git a/build/build-clang/clang-17.json b/build/build-clang/clang-17.json
index 4ce770b7a4a3..1e941aac77a9 100644
--- a/build/build-clang/clang-17.json
+++ b/build/build-clang/clang-17.json
@@ -13,7 +13,6 @@
         "revert-llvmorg-15-init-11205-gcead4eceb01b_clang_16.patch",
         "llvmorg-18-init-8471-g160e8eb44961.patch",
         "D146664.patch",
-        "llvmorg-19-init-5399-gddcbab37ac0e.patch",
         "win64-ret-null-on-commitment-limit_clang_14.patch",
         "compiler-rt-rss-limit-heap-profile.patch"
     ]
diff --git a/build/build-clang/clang-18.json b/build/build-clang/clang-18.json
index 883886c4bcec..5f66e5894708 100644
--- a/build/build-clang/clang-18.json
+++ b/build/build-clang/clang-18.json
@@ -15,7 +15,6 @@
         "revert-llvmorg-16-init-11301-g163bb6d64e5f_clang_18.patch",
         "revert-llvmorg-15-init-13446-g7524fe962e47.patch",
         "revert-llvmorg-15-init-11205-gcead4eceb01b_clang_18.patch",
-        "llvmorg-19-init-5399-gddcbab37ac0e.patch",
         "win64-ret-null-on-commitment-limit_clang_14.patch",
         "compiler-rt-rss-limit-heap-profile.patch"
     ]
diff --git a/build/build-clang/llvmorg-19-init-5399-gddcbab37ac0e.patch b/build/build-clang/llvmorg-19-init-5399-gddcbab37ac0e.patch
deleted file mode 100644
index 3904d292a079..000000000000
--- a/build/build-clang/llvmorg-19-init-5399-gddcbab37ac0e.patch
+++ /dev/null
@@ -1,135 +0,0 @@
-commit ddcbab37ac0e5743a8d39be3dd48d967f4c85504
-Author: serge-sans-paille <sguelton@mozilla.com>
-Date:   Thu Mar 14 07:41:46 2024 +0100
-
-    [compiler-rt] Also consider SIGPROF as a synchronous signal
-    
-    Blocking that signal causes inter-blocking for profilers that monitor
-    threads through that signal.
-    
-    Update tests accordingly to use an uncaught signal.
-    
-    This is a recommit of 6f3f659ce9ab91002b4a490b0ce4b085981383cd with the
-    tests fixed.
-    
-    Fix #83844 and #83561
-
-diff --git a/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp b/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
-index 8ffc703b05ea..2bebe651b994 100644
---- a/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
-+++ b/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
-@@ -126,6 +126,7 @@ const int SIGFPE = 8;
- const int SIGSEGV = 11;
- const int SIGPIPE = 13;
- const int SIGTERM = 15;
-+const int SIGPROF = 27;
- #if defined(__mips__) || SANITIZER_FREEBSD || SANITIZER_APPLE || SANITIZER_NETBSD
- const int SIGBUS = 10;
- const int SIGSYS = 12;
-@@ -2168,7 +2169,8 @@ static bool is_sync_signal(ThreadSignalContext *sctx, int sig,
-     return false;
- #endif
-   return sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || sig == SIGTRAP ||
--         sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS;
-+         sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
-+         sig == SIGPROF;
- }
- 
- void sighandler(int sig, __sanitizer_siginfo *info, void *ctx) {
-diff --git a/compiler-rt/test/tsan/signal_errno.cpp b/compiler-rt/test/tsan/signal_errno.cpp
-index 7e1fd4b0c5a5..99d4b6d84ca4 100644
---- a/compiler-rt/test/tsan/signal_errno.cpp
-+++ b/compiler-rt/test/tsan/signal_errno.cpp
-@@ -18,7 +18,7 @@ static void MyHandler(int, siginfo_t *s, void *c) {
- 
- static void* sendsignal(void *p) {
-   barrier_wait(&barrier);
--  pthread_kill(mainth, SIGPROF);
-+  pthread_kill(mainth, SIGALRM);
-   return 0;
- }
- 
-@@ -37,7 +37,7 @@ int main() {
-   mainth = pthread_self();
-   struct sigaction act = {};
-   act.sa_sigaction = &MyHandler;
--  sigaction(SIGPROF, &act, 0);
-+  sigaction(SIGALRM, &act, 0);
-   pthread_t th;
-   pthread_create(&th, 0, sendsignal, 0);
-   loop();
-@@ -46,7 +46,7 @@ int main() {
- }
- 
- // CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
--// CHECK:   Signal 27 handler invoked at:
-+// CHECK:   Signal 14 handler invoked at:
- // CHECK:     #0 MyHandler(int, {{(__)?}}siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cpp
- // CHECK:     main
- // CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler
-diff --git a/compiler-rt/test/tsan/signal_sync.cpp b/compiler-rt/test/tsan/signal_sync.cpp
-index b529a1859f52..b283c9341636 100644
---- a/compiler-rt/test/tsan/signal_sync.cpp
-+++ b/compiler-rt/test/tsan/signal_sync.cpp
-@@ -30,7 +30,7 @@ int main() {
- 
-   struct sigaction act = {};
-   act.sa_handler = &handler;
--  if (sigaction(SIGPROF, &act, 0)) {
-+  if (sigaction(SIGALRM, &act, 0)) {
-     perror("sigaction");
-     exit(1);
-   }
-@@ -39,7 +39,7 @@ int main() {
-   t.it_value.tv_sec = 0;
-   t.it_value.tv_usec = 10;
-   t.it_interval = t.it_value;
--  if (setitimer(ITIMER_PROF, &t, 0)) {
-+  if (setitimer(ITIMER_REAL, &t, 0)) {
-     perror("setitimer");
-     exit(1);
-   }
-diff --git a/compiler-rt/test/tsan/signal_thread.cpp b/compiler-rt/test/tsan/signal_thread.cpp
-index aa91d1ddeb10..e5ea44187e32 100644
---- a/compiler-rt/test/tsan/signal_thread.cpp
-+++ b/compiler-rt/test/tsan/signal_thread.cpp
-@@ -24,7 +24,7 @@ static void* thr(void *p) {
- int main() {
-   struct sigaction act = {};
-   act.sa_handler = &handler;
--  if (sigaction(SIGPROF, &act, 0)) {
-+  if (sigaction(SIGALRM, &act, 0)) {
-     perror("sigaction");
-     exit(1);
-   }
-@@ -33,7 +33,7 @@ int main() {
-   t.it_value.tv_sec = 0;
-   t.it_value.tv_usec = 10;
-   t.it_interval = t.it_value;
--  if (setitimer(ITIMER_PROF, &t, 0)) {
-+  if (setitimer(ITIMER_REAL, &t, 0)) {
-     perror("setitimer");
-     exit(1);
-   }
-diff --git a/compiler-rt/test/tsan/signal_thread2.cpp b/compiler-rt/test/tsan/signal_thread2.cpp
-index 9bde4f70b39d..5236628e13b6 100644
---- a/compiler-rt/test/tsan/signal_thread2.cpp
-+++ b/compiler-rt/test/tsan/signal_thread2.cpp
-@@ -40,7 +40,7 @@ static void *thr(void *p) {
- int main() {
-   struct sigaction act = {};
-   act.sa_handler = &handler;
--  if (sigaction(SIGPROF, &act, 0)) {
-+  if (sigaction(SIGALRM, &act, 0)) {
-     perror("sigaction");
-     exit(1);
-   }
-@@ -49,7 +49,7 @@ int main() {
-   t.it_value.tv_sec = 0;
-   t.it_value.tv_usec = 10;
-   t.it_interval = t.it_value;
--  if (setitimer(ITIMER_PROF, &t, 0)) {
-+  if (setitimer(ITIMER_REAL, &t, 0)) {
-     perror("setitimer");
-     exit(1);
-   }
diff --git a/taskcluster/ci/toolchain/rust.yml b/taskcluster/ci/toolchain/rust.yml
index a5ff3abbf8a4..62f4fd4747ea 100644
--- a/taskcluster/ci/toolchain/rust.yml
+++ b/taskcluster/ci/toolchain/rust.yml
@@ -56,7 +56,6 @@ linux64-rust-dev:
         arguments: [
             '--patch', 'rust-vendor-std.patch',
             '--patch', 'src/tools/cargo:cargo-vendor-std.patch',
-            '--patch', 'src/llvm-project:../build-clang/llvmorg-19-init-5399-gddcbab37ac0e.patch',
             '--channel', 'dev',
             '--host', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-unknown-linux-gnu',