syzbot

BUG: unable to handle kernel paging request at ffffffffffffff6c
PGD 9e6e067 P4D 9e6e067 PUD 9e70067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8135 Comm: syz-executor.1 Not tainted 4.19.196-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:261 [inline]
RIP: 0010:wait_consider_task+0xae/0x3910 kernel/exit.c:1333
Code: 8e 6c 04 00 00 48 89 c8 48 89 4c 24 10 48 c1 e8 03 0f b6 14 28 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4b 1c 00 00 <45> 8b a6 6c 04 00 00 bf 10 00 00 00 44 89 e6 e8 ee 16 2a 00 41 83
RSP: 0018:ffff88809b047b00 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffffffffff6c
RDX: 0000000000000000 RSI: ffffffff81386982 RDI: ffff88809b047d00
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff88809b047d00
R13: ffff88809b44e280 R14: fffffffffffffb00 R15: ffff88809b44e770
FS:  00000000025e1400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 000000009cafb000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_wait_thread kernel/exit.c:1442 [inline]
 do_wait+0x429/0x9c0 kernel/exit.c:1513
 kernel_wait4+0x14c/0x260 kernel/exit.c:1655
 __do_sys_wait4 kernel/exit.c:1667 [inline]
 __se_sys_wait4+0x149/0x160 kernel/exit.c:1663
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x464a77
Code: 89 7c 24 10 48 89 4c 24 18 e8 d5 44 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 05 45 02 00 8b 44
RSP: 002b:00007ffc7da30e60 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000001fdf RCX: 0000000000464a77
RDX: 0000000040000001 RSI: 00007ffc7da30efc RDI: 00000000ffffffff
RBP: 00007ffc7da30efc R08: 0000000000000000 R09: 0000015926557659
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 0000000000139dbe R14: 0000000000000001 R15: 00007ffc7da30f60
Modules linked in:
CR2: ffffffffffffff6c
---[ end trace fb0c4ee8adf712d7 ]---
RIP: 0010:__read_once_size include/linux/compiler.h:261 [inline]
RIP: 0010:wait_consider_task+0xae/0x3910 kernel/exit.c:1333
Code: 8e 6c 04 00 00 48 89 c8 48 89 4c 24 10 48 c1 e8 03 0f b6 14 28 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4b 1c 00 00 <45> 8b a6 6c 04 00 00 bf 10 00 00 00 44 89 e6 e8 ee 16 2a 00 41 83
RSP: 0018:ffff88809b047b00 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffffffffff6c
RDX: 0000000000000000 RSI: ffffffff81386982 RDI: ffff88809b047d00
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff88809b047d00
R13: ffff88809b44e280 R14: fffffffffffffb00 R15: ffff88809b44e770
FS:  00000000025e1400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 000000009cafb000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400