KMSAN: uninit-value in fd

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
e44bd8e9-a601-4e4b-9443-bd6a886590cc	repro		💥	KMSAN: uninit-value in fd_install	2026/03/10 13:48	2026/03/11 13:04	2026/03/11 14:11	86914af9098a80da53c3c5d46be980c572ee29f8	Error 503, Message: This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later., Status: UNAVAILABLE, Details: [map[@type:type.googleapis.com/google.rpc.DebugInfo detail:[ORIGINAL ERROR] generic::unavailable: Overloaded prefill queue.; Failed while executing Op 'Prefill'; Failed to close the streaming context; status = UNAVAILABLE: Overloaded prefill queue.; Failed while executing Op 'Prefill' [type.googleapis.com/stairways.orch.ErrorLoc='learning/serving/servables/wiz/orch_wiz_servable.cc:976'] === Source Location Trace: === learning/brain/research/stairways/orchestrator/leaf/chain_stub.cc:125 learning/serving/servables/wiz/orch_wiz_servable.cc:1008 ; Failed to run inference for model: go/debugproto name: "prod-common-global__/aistudio/gemini-v4p1m-rev24-snowball-lc__main__/aistudio/gemini-v4p1m-rev24-snowball-lc__2026022700__prefill__variant__d76be967-e50b-41c8-931e-6559b02591d8" version { value: 1 } signature_name: "serving_default" [google.rpc.error_details_ext] { message: "This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later." details { type_url: "type.googleapis.com/language_labs.genai.debug.GeminiApiDebugInfo" value: "\212\001\241\006\n\353\005Overloaded prefill queue.; Failed while executing Op \'Prefill\'; Failed to close the streaming context; status = UNAVAILABLE: Overloaded prefill queue.; Failed while executing Op \'Prefill\' [type.googleapis.com/stairways.orch.ErrorLoc=\'learning/serving/servables/wiz/orch_wiz_servable.cc:976\']\n=== Source Location Trace: ===\nlearning/brain/research/stairways/orchestrator/leaf/chain_stub.cc:125\nlearning/serving/servables/wiz/orch_wiz_servable.cc:1008\n; Failed to run inference for model: go/debugproto \nname: \"prod-common-global__/aistudio/gemini-v4p1m-rev24-snowball-lc__main__/aistudio/gemini-v4p1m-rev24-snowball-lc__2026022700__prefill__variant__d76be967-e50b-41c8-931e-6559b02591d8\"\nversion {\n value: 1\n}\nsignature_name: \"serving_default\"\n\0221labs/language/genai/common/error_handler.cc:290:0" } }]]

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	general protection fault in fd_install fs	2	C			64	116d	118d	29/29	fixed on 2026/01/07 12:29

Kernel

Title

Rank 🛈

upstream

general protection fault in fd_install fs

116d

118d

29/29

fixed on 2026/01/07 12:29

===================================================== BUG: KMSAN: uninit-value in fd_install+0x233/0x2f0 fs/file.c:689 fd_install+0x233/0x2f0 fs/file.c:689 do_sys_openat2+0x259/0x430 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x240/0x300 fs/open.c:1447 x64_sys_call+0x3597/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4960 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x967/0x1730 mm/slub.c:5270 dup_fd+0x66/0x1160 fs/file.c:390 copy_files+0x10c/0x250 kernel/fork.c:1635 copy_process+0x25ab/0x5df0 kernel/fork.c:2209 kernel_clone+0x415/0x1080 kernel/fork.c:2651 __do_sys_clone kernel/fork.c:2792 [inline] __se_sys_clone kernel/fork.c:2776 [inline] __x64_sys_clone+0x253/0x360 kernel/fork.c:2776 x64_sys_call+0x1666/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 5136 Comm: udevd Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 =====================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/09 14:48	upstream	05f7e89ab973	df949cd9	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kmsan-gce-386-root	KMSAN: uninit-value in fd_install

Crashes (1):

Assets (help?)