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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id j11-20020a170902690b00b001b03842ab78sm10672486plk.89.2023.06.13.13.46.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jun 2023 13:46:55 -0700 (PDT) Date: Tue, 13 Jun 2023 13:46:54 -0700 From: Kees Cook To: kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Masahiro Yamada , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , "Gustavo A. R. Silva" , linux-kbuild@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: Re: [linux-next:master] [kbuild] df8fc4e934: BUG:unable_to_handle_page_fault_for_address Message-ID: <202306131342.51A51F651C@keescook> References: <202306102333.8f5a7443-oliver.sang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202306102333.8f5a7443-oliver.sang@intel.com> X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 2097F4000E X-Stat-Signature: j198r79zicp3xt1wwhffuyq4gn6k99ot X-Rspam-User: X-HE-Tag: 1686689216-479836 X-HE-Meta: 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 D9DTgIDz +spR1t0e4oPi0krmsUASnUUWgAUXU8A1YNZE+nf/xKi8Rjez6xUwcKGNKFua/lHra7xEi/1bGTQA8B2ivOWndJsHDHuBP5NTyQBa4E+slWyJ1IJS91DI2omlnkUW8dlUjbInwHS/FayLhb/y5Lznjmr7QkbTecD2aU2hNao31Ss47scgg/DnxbFSAsWc7iXhZIq0ct2CDEE5KMZ2eAoMXglRdwwe+tNIrhlZMXcyOcBjlbus3kiQyJEO6rwz1FvQliOeU6TB+NYpFWxcVEA55HOosPwv6WkwXH6ogKcrYAbjOi1Zn4opq131+5dd9riO12Y1r9hAtLDYqQ6B+SIo6u1kUF3htBjIbPvet/r3GaA9BaKL4RIOz2sqBowvmfZOkBmsZMIZzswPsGpN0iQNtaiQoOg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000047, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Jun 11, 2023 at 09:41:30PM +0800, kernel test robot wrote: > the issue we found below is by clang-15, but we confirmed clang-15 we use is > commit 8dfdcc7b7b in llvm-project. it supports the flag already. Interesting! Thanks for the report. > [ 228.605608][ C1] BUG: unable to handle page fault for address: 04090300 > [...] > [ 228.608262][ C1] EIP: string (lib/vsprintf.c:644 lib/vsprintf.c:726) > [...] > [ 228.608262][ C1] Call Trace: > [ 228.608262][ C1] > [ 228.608262][ C1] vsnprintf (lib/vsprintf.c:2817) > [ 228.608262][ C1] vprintk_store (kernel/printk/printk.c:2191) > [ 228.608262][ C1] vprintk_emit (kernel/printk/printk.c:2288) > [ 228.608262][ C1] vprintk_default (kernel/printk/printk.c:2318) > [ 228.608262][ C1] vprintk (kernel/printk/printk_safe.c:50) > [ 228.608262][ C1] _printk (kernel/printk/printk.c:2331) > [ 228.608262][ C1] __ubsan_handle_out_of_bounds (lib/ubsan.c:209 lib/ubsan.c:343) This is a crash within the UBSAN handler! That's very unexpected. > [ 228.608262][ C1] get_string (drivers/usb/gadget/composite.c:1314) > [ 228.608262][ C1] composite_setup (drivers/usb/gadget/composite.c:1871) > [ 228.608262][ C1] dummy_timer (drivers/usb/gadget/udc/dummy_hcd.c:?) And the out-of-bounds condition got triggered in dummy_hcd. I also see this is happening in SOFTIRQ context. I wonder if there is a problem with UBSAN vs SOFTIRQ. Again, I'd find that surprising... I'll see what I can find... -- Kees Cook