[U] 
------------[ cut here ]------------
WARNING: CPU: 1 PID: 15906 at lib/iov_iter.c:1090 iov_iter_revert+0x2e3/0x8e0 lib/iov_iter.c:1090
Modules linked in:
CPU: 1 PID: 15906 Comm: syz-executor.3 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+0x2e3/0x8e0 lib/iov_iter.c:1090
Code: 05 00 00 45 8b 74 24 08 48 89 de 4c 89 6d 20 49 83 c5 01 4c 89 f7 e8 bc eb b4 fd 49 39 de 72 ba e9 2c ff ff ff e8 9d e5 b4 fd <0f> 0b e9 30 ff ff ff e8 91 e5 b4 fd 48 8d 7d 18 48 b8 00 00 00 00
RSP: 0018:ffffc9000296fc10 EFLAGS: 00010212
RAX: 0000000000005c0c RBX: ffffffffffffffff RCX: ffffc9000fa05000
RDX: 0000000000040000 RSI: ffffffff83bdef03 RDI: 0000000000000003
RBP: ffffc9000296fd48 R08: 000000007ffff000 R09: ffffffff8f86683f
R10: ffffffff83bdec5e R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffffc9000296fd48 R15: ffff888067978000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0063) knlGS:00000000f54dfb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f3e5560af80 CR3: 0000000012c06000 CR4: 00000000001506e0
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.constprop.0+0x55f/0x8f0 drivers/tty/tty_io.c:1048
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x791/0xa30 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f06549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f54df5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000