[U] 
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8431 at lib/iov_iter.c:1090 iov_iter_revert+0x338/0xa00 lib/iov_iter.c:1090
Modules linked in:
CPU: 1 PID: 8431 Comm: syz-executor733 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:iov_iter_revert+0x338/0xa00 lib/iov_iter.c:1090
Code: 80 3c 30 00 48 8b 5c 24 20 74 08 48 89 df e8 4f e7 f3 fd 4c 89 23 48 83 c4 70 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 78 74 b0 fd <0f> 0b eb e8 48 8d 6b 18 48 89 e8 48 c1 e8 03 42 80 3c 28 00 74 08
RSP: 0018:ffffc90000fefcf0 EFLAGS: 00010293
RAX: ffffffff83c76b98 RBX: ffffc90000fefe50 RCX: ffff88801f730000
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 000000007ffff000
RBP: ffffffffffffffff R08: ffffffff83c7689c R09: fffffbfff1f218a4
R10: fffffbfff1f218a4 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffffffffffff R15: ffff88801ae26000
FS:  0000000002368300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdba445557 CR3: 0000000026345000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_tty_write drivers/tty/tty_io.c:967 [inline]
 file_tty_write+0x5f2/0x950 drivers/tty/tty_io.c:1048
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x896/0xab0 fs/read_write.c:605
 ksys_write+0x11b/0x220 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x43ee99
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd9d6ba768 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ee99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000402e80 R08: 0000000000400488 R09: 0000000000400488
R10: 0000000000400488 R11: 0000000000000246 R12: 0000000000402f10
R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488