On 2/9/21 5:24 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: dd86e7fa Merge tag 'pci-v5.11-fixes-2' of git://git.kernel.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=105930c4d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=266a5362c89c8127 > dashboard link: https://syzkaller.appspot.com/bug?extid=f3a0fa110fd630ab56c8 > compiler: Debian clang version 11.0.1-2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ba3038d00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15cf0d64d00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+f3a0fa110fd630ab56c8@xxxxxxxxxxxxxxxxxxxxxxxxx #syz dup: UBSAN: shift-out-of-bounds in xprt_calc_majortimeo > ================================================================================ > UBSAN: shift-out-of-bounds in net/sunrpc/xprt.c:658:14 > shift exponent 536870976 is too large for 64-bit type 'unsigned long' > CPU: 1 PID: 8411 Comm: syz-executor902 Not tainted 5.11.0-rc6-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack+0x137/0x1be lib/dump_stack.c:120 > ubsan_epilogue lib/ubsan.c:148 [inline] > __ubsan_handle_shift_out_of_bounds+0x432/0x4d0 lib/ubsan.c:395 > xprt_calc_majortimeo net/sunrpc/xprt.c:658 [inline] > xprt_init_majortimeo net/sunrpc/xprt.c:686 [inline] -- ~Randy
