Hello, syzbot found the following issue on: HEAD commit: ff1176468d36 Linux 5.14-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10034f0e300000 kernel config: https://syzkaller.appspot.com/x/.config?x=40eef000d7648480 dashboard link: https://syzkaller.appspot.com/bug?extid=66bddd4a39f264bee945 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+66bddd4a39f264bee945@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================================ UBSAN: array-index-out-of-bounds in kernel/locking/osq_lock.c:34:9 index 117901062 is out of range for type 'long unsigned int [8]' CPU: 1 PID: 25857 Comm: kworker/u4:3 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:288 decode_cpu kernel/locking/osq_lock.c:34 [inline] osq_lock+0x5ab/0x600 kernel/locking/osq_lock.c:111 rwsem_optimistic_spin kernel/locking/rwsem.c:746 [inline] rwsem_down_write_slowpath+0x1bb/0x11d0 kernel/locking/rwsem.c:1025 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1407 anon_vma_lock_write include/linux/rmap.h:116 [inline] __anon_vma_prepare+0xbf/0x560 mm/rmap.c:203 anon_vma_prepare include/linux/rmap.h:149 [inline] do_anonymous_page mm/memory.c:3765 [inline] handle_pte_fault mm/memory.c:4556 [inline] __handle_mm_fault+0x4338/0x5320 mm/memory.c:4693 handle_mm_fault+0x1c8/0x790 mm/memory.c:4791 faultin_page mm/gup.c:951 [inline] __get_user_pages+0x806/0x1430 mm/gup.c:1173 __get_user_pages_locked mm/gup.c:1359 [inline] __get_user_pages_remote+0x18f/0x840 mm/gup.c:1865 get_user_pages_remote+0x63/0x90 mm/gup.c:1938 get_arg_page+0xba/0x200 fs/exec.c:220 copy_string_kernel+0x1b4/0x520 fs/exec.c:631 kernel_execve+0x25c/0x460 fs/exec.c:1961 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ================================================================================ --- 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.
