syzbot

general protection fault, probably for non-canonical address 0xdffffc0004000298: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x00000000200014c0-0x00000000200014c7]
CPU: 1 PID: 8937 Comm: syz-executor.5 Not tainted 6.3.0-rc3-next-20230327-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:iov_iter_iovec include/linux/uio.h:137 [inline]
RIP: 0010:do_loop_readv_writev fs/read_write.c:752 [inline]
RIP: 0010:do_loop_readv_writev fs/read_write.c:743 [inline]
RIP: 0010:do_iter_write+0x482/0x700 fs/read_write.c:863
Code: 00 0f 85 eb 01 00 00 4d 8b 75 28 e8 a8 d9 9e ff 48 8b 44 24 20 80 38 00 0f 85 6b 01 00 00 49 8b 6c 24 18 48 89 ea 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 47 01 00 00 48 8b 44 24 28 48 8b 75 00 80 38
RSP: 0018:ffffc90004d4fc68 EFLAGS: 00010202
RAX: fffff520009a9fae RBX: 0000000000000008 RCX: ffffc9000f783000
RDX: 0000000004000298 RSI: ffffffff81e3fda8 RDI: 0000000000000007
RBP: 00000000200014c0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000000 R12: ffffc90004d4fd58
R13: ffff88807ad53180 R14: ffffffff8a5cee00 R15: dffffc0000000000
FS:  00007f38c1390700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 00000000223cb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vfs_writev+0x1aa/0x670 fs/read_write.c:934
 do_writev+0x133/0x2f0 fs/read_write.c:977
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f38c068c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f38c1390168 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f38c07ac1f0 RCX: 00007f38c068c0f9
RDX: 0000000000000001 RSI: 00000000200017c0 RDI: 0000000000000008
RBP: 00007f38c06e7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffefa95181f R14: 00007f38c1390300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:iov_iter_iovec include/linux/uio.h:137 [inline]
RIP: 0010:do_loop_readv_writev fs/read_write.c:752 [inline]
RIP: 0010:do_loop_readv_writev fs/read_write.c:743 [inline]
RIP: 0010:do_iter_write+0x482/0x700 fs/read_write.c:863
Code: 00 0f 85 eb 01 00 00 4d 8b 75 28 e8 a8 d9 9e ff 48 8b 44 24 20 80 38 00 0f 85 6b 01 00 00 49 8b 6c 24 18 48 89 ea 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 47 01 00 00 48 8b 44 24 28 48 8b 75 00 80 38
RSP: 0018:ffffc90004d4fc68 EFLAGS: 00010202
RAX: fffff520009a9fae RBX: 0000000000000008 RCX: ffffc9000f783000
RDX: 0000000004000298 RSI: ffffffff81e3fda8 RDI: 0000000000000007
RBP: 00000000200014c0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000000 R12: ffffc90004d4fd58
R13: ffff88807ad53180 R14: ffffffff8a5cee00 R15: dffffc0000000000
FS:  00007f38c1390700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 00000000223cb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 0f                	add    %cl,(%rdi)
   2:	85 eb                	test   %ebp,%ebx
   4:	01 00                	add    %eax,(%rax)
   6:	00 4d 8b             	add    %cl,-0x75(%rbp)
   9:	75 28                	jne    0x33
   b:	e8 a8 d9 9e ff       	callq  0xff9ed9b8
  10:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
  15:	80 38 00             	cmpb   $0x0,(%rax)
  18:	0f 85 6b 01 00 00    	jne    0x189
  1e:	49 8b 6c 24 18       	mov    0x18(%r12),%rbp
  23:	48 89 ea             	mov    %rbp,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	42 80 3c 3a 00       	cmpb   $0x0,(%rdx,%r15,1) <-- trapping instruction
  2f:	0f 85 47 01 00 00    	jne    0x17c
  35:	48 8b 44 24 28       	mov    0x28(%rsp),%rax
  3a:	48 8b 75 00          	mov    0x0(%rbp),%rsi
  3e:	80                   	.byte 0x80
  3f:	38                   	.byte 0x38