[U] 
------------[ cut here ]------------
WARNING: CPU: 1 PID: 10221 at lib/iov_iter.c:1088 iov_iter_revert lib/iov_iter.c:1129 [inline]
WARNING: CPU: 1 PID: 10221 at lib/iov_iter.c:1088 iov_iter_revert+0x207/0x7d0 lib/iov_iter.c:1084
Modules linked in:
CPU: 1 PID: 10221 Comm: syz-executor.1 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:iov_iter_revert+0x207/0x7d0 lib/iov_iter.c:1088
Code: e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e 4c 04 00 00 41 8b 45 08 48 83 c3 01 49 89 5c 24 20 48 39 e8 72 cb e9 73 ff ff ff <0f> 0b e9 79 ff ff ff 49 8d 7c 24 18 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000adffc38 EFLAGS: 00010286
RAX: 0000000000000001 RBX: ffff88802f1d3000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffffffffffff RDI: ffffc9000adffd70
RBP: ffffffffffffffff R08: 0000000000000001 R09: ffffffff8ee466ff
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: ffff888020dd8000 R15: ffffc9000adffd70
FS:  00007ff1b10dd700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca96ac6e7 CR3: 0000000010fad000 CR4: 0000000000350ef0
Call Trace:
 do_tty_write drivers/tty/tty_io.c:971 [inline]
 tty_write+0x46a/0x840 drivers/tty/tty_io.c:1051
 call_write_iter include/linux/fs.h:1903 [inline]
 new_sync_write+0x35d/0x600 fs/read_write.c:518
 vfs_write+0x5d5/0x890 fs/read_write.c:605
 ksys_write+0xf4/0x1d0 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465b09
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff1b10dd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffd61f78b7f R14: 00007ff1b10dd300 R15: 0000000000022000