TITLE: BUG: unable to handle kernel access to user memory in schedule_tail
ALT: bad-access in schedule_tail

[  472.619615][ T5233] Unable to handle kernel access to user memory without uaccess routines at virtual address 000000000cc6b0d0
[  472.675587][ T5233] Oops [#1]
[  472.676471][ T5233] Modules linked in:
[  472.677473][ T5233] CPU: 0 PID: 5233 Comm: syz-executor.1 Not tainted 5.11.0-11272-gf01e631cccab-dirty #35
[  472.678673][ T5233] Hardware name: riscv-virtio,qemu (DT)
[  472.679566][ T5233] epc : schedule_tail+0x72/0xb2
[  472.680826][ T5233]  ra : schedule_tail+0x70/0xb2
[  472.681820][ T5233] epc : ffffffe00008c762 ra : ffffffe00008c760 sp : ffffffe00853fec0
[  472.682846][ T5233]  gp : ffffffe006c38208 tp : ffffffe009bb16c0 t0 : 0000000000000000
[  472.683823][ T5233]  t1 : 0000000000000001 t2 : 00000000000f4240 s0 : ffffffe00853fee0
[  472.684798][ T5233]  s1 : 000000000cc6b0d0 a0 : 0000000000000021 a1 : 0000000000000003
[  472.685790][ T5233]  a2 : 1ffffffc0ffb0b00 a3 : ffffffe0000c7f76 a4 : f973b8462e212b00
[  472.686849][ T5233]  a5 : 0000000000000000 a6 : 0000000000f00000 a7 : ffffffe0000f8b2e
[  472.687825][ T5233]  s2 : 0000000000040000 s3 : ffffffe0266696c0 s4 : ffffffe00835ffe0
[  472.688839][ T5233]  s5 : 0000000000004000 s6 : ffffffe07fdb4e00 s7 : ffffffe07fdb4850
[  472.689825][ T5233]  s8 : ffffffe07fdb3e18 s9 : ffffffe07fdb4e00 s10: ffffffe0266696e8
[  472.691266][ T5233]  s11: 0000006deabf84e0 t3 : f973b8462e212b00 t4 : ffffffc404a90fb2
[  472.692336][ T5233]  t5 : ffffffc404a90fba t6 : 0000000000040000
[  472.693211][ T5233] status: 0000000000000120 badaddr: 000000000cc6b0d0 cause: 000000000000000f
[  472.694320][ T5233] Call Trace:
[  472.694969][ T5233] [<ffffffe00008c762>] schedule_tail+0x72/0xb2
[  472.696215][ T5233] [<ffffffe000005570>] ret_from_exception+0x0/0x14
[  472.698018][ T5233] Dumping ftrace buffer:
[  472.699328][ T5233]    (ftrace buffer empty)
[  472.736656][ T5233] ---[ end trace 170f72f747744a94 ]---
