Hello, syzbot found the following issue on: HEAD commit: 73d62e81 kmsan: random: prevent boot-time reports in _mix_.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=12d97ccb500000 kernel config: https://syzkaller.appspot.com/x/.config?x=eef728deea880383 dashboard link: https://syzkaller.appspot.com/bug?extid=2cd8c5db4a85f0a04142 compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=100658c5500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16e4cb9b500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2cd8c5db4a85f0a04142@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in legacy_dvb_usb_read_remote_control+0x3b8/0x730 drivers/media/usb/dvb-usb/dvb-usb-remote.c:129 CPU: 0 PID: 8393 Comm: kworker/0:5 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events legacy_dvb_usb_read_remote_control Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 legacy_dvb_usb_read_remote_control+0x3b8/0x730 drivers/media/usb/dvb-usb/dvb-usb-remote.c:129 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418 kthread+0x51c/0x560 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Local variable ----state@legacy_dvb_usb_read_remote_control created at: legacy_dvb_usb_read_remote_control+0x68/0x730 drivers/media/usb/dvb-usb/dvb-usb-remote.c:120 legacy_dvb_usb_read_remote_control+0x68/0x730 drivers/media/usb/dvb-usb/dvb-usb-remote.c:120 ===================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8393 Comm: kworker/0:5 Tainted: G B 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events legacy_dvb_usb_read_remote_control Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 panic+0x4c8/0xea7 kernel/panic.c:231 kmsan_report+0x1da/0x1e0 mm/kmsan/kmsan_report.c:141 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 legacy_dvb_usb_read_remote_control+0x3b8/0x730 drivers/media/usb/dvb-usb/dvb-usb-remote.c:129 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418 kthread+0x51c/0x560 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
