pktgen: Cannot create thread for cpu 0 (-4)
pktgen: kernel_thread() failed for cpu 1
pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 1837 Comm: syz-executor5 Not tainted 4.9.44-gbf7ef8f #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c75d3000 task.stack: ffff8801a6110000
RIP: 0010:[<ffffffff81cdf70a>]  [<ffffffff81cdf70a>] bio_copy_user_iov+0x5fa/0xea0 block/bio.c:1205
RSP: 0018:ffff8801a6117590  EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801a7f59b00 RDI: ffff8801a61179e4
RBP: ffff8801a61176a0 R08: ffffed0034feb371 R09: ffff8801a7f59b00
R10: 0000000000000011 R11: ffffed0034feb370 R12: 0000000000000026
R13: ffff8801a61179d8 R14: 0000000000000026 R15: dffffc0000000000
FS:  00007f2317f55700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020869000 CR3: 00000001c659c000 CR4: 00000000001406f0
Stack:
 ffffffff81e42dff ffffed003a44028b ffff8801d220145c ffff8801ca632d20
 1ffff10034c22ebf 01ff880102080020 ffff880100000001 ffff8801d2200d08
 ffff8801a61179d8 ffff8801a7f59b00 ffff8801a6117768 0000000000000000
Call Trace:
 [<ffffffff81d13ec7>] __blk_rq_map_user_iov block/blk-map.c:56 [inline]
 [<ffffffff81d13ec7>] blk_rq_map_user_iov+0x237/0x790 block/blk-map.c:133
 [<ffffffff81d14531>] blk_rq_map_user+0x111/0x1a0 block/blk-map.c:163
 [<ffffffff82668c0a>] sg_start_req drivers/scsi/sg.c:1766 [inline]
 [<ffffffff82668c0a>] sg_common_write.isra.24+0xc1a/0x17c0 drivers/scsi/sg.c:775
 [<ffffffff8266d028>] sg_write+0x688/0xad0 drivers/scsi/sg.c:678
 [<ffffffff8156a563>] __vfs_write+0x103/0x680 fs/read_write.c:510
 [<ffffffff8156e690>] vfs_write+0x170/0x4e0 fs/read_write.c:560
 [<ffffffff81572089>] SYSC_write fs/read_write.c:607 [inline]
 [<ffffffff81572089>] SyS_write+0xd9/0x1b0 fs/read_write.c:599
 [<ffffffff838a6885>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 89 e8 48 c1 e8 03 42 80 3c 38 00 0f 85 5f 08 00 00 89 d8 49 8b 4d 00 99 f7 bd 20 ff ff ff 48 98 48 8d 04 c1 48 89 c1 48 c1 e9 03 <42> 80 3c 39 00 0f 85 47 08 00 00 48 63 d2 83 c3 01 48 c1 e2 06 
RIP  [<ffffffff81cdf70a>] bio_copy_user_iov+0x5fa/0xea0 block/bio.c:1205
 RSP <ffff8801a6117590>
---[ end trace ecb4c078f63b317c ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..