------------[ cut here ]------------
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/dt2811.c:570:31
shift exponent -251 is negative
CPU: 2 UID: 0 PID: 6054 Comm: syz.0.45 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_shift_out_of_bounds+0x279/0x2a0 lib/ubsan.c:494
 dt2811_attach.cold+0x19/0x1e drivers/comedi/drivers/dt2811.c:570
 comedi_device_attach+0x40e/0x6b0 drivers/comedi/drivers.c:1101
 do_devconfig_ioctl+0x1b3/0x6d0 drivers/comedi/comedi_fops.c:930
 comedi_unlocked_ioctl+0x860/0x3310 drivers/comedi/comedi_fops.c:2302
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f957d99e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f957e8e1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f957dc25fa0 RCX: 00007f957d99e159
RDX: 0000200000000100 RSI: 0000000040946400 RDI: 0000000000000006
RBP: 00007f957da3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f957dc26038 R14: 00007f957dc25fa0 R15: 00007ffc219a7cd8
 </TASK>
---[ end trace ]---