------------[ cut here ]------------
WARNING: CPU: 0 PID: 7774 at fs/io_uring.c:1535 req_ref_put fs/io_uring.c:1535 [inline]
WARNING: CPU: 0 PID: 7774 at fs/io_uring.c:1535 req_ref_put fs/io_uring.c:1533 [inline]
WARNING: CPU: 0 PID: 7774 at fs/io_uring.c:1535 io_poll_double_wake+0x4fb/0x760 fs/io_uring.c:4974
Modules linked in:
CPU: 0 PID: 7774 Comm: syz-executor.2 Not tainted 5.14.0-rc2-next-20210723-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:req_ref_put fs/io_uring.c:1535 [inline]
RIP: 0010:req_ref_put fs/io_uring.c:1533 [inline]
RIP: 0010:io_poll_double_wake+0x4fb/0x760 fs/io_uring.c:4974
Code: 3d dc ff f0 41 ff 4c 24 5c 0f 94 c3 31 ff 89 de e8 8a bb 96 ff 84 db b8 01 00 00 00 0f 84 6f fc ff ff 89 04 24 e8 35 b5 96 ff <0f> 0b 8b 04 24 e9 5d fc ff ff e8 26 b5 96 ff 4c 89 e5 e9 a1 fb ff
RSP: 0018:ffffc9000221f830 EFLAGS: 00010016
RAX: 0000000000008a43 RBX: 0000000000000001 RCX: ffffc9000deec000
RDX: 0000000000040000 RSI: ffffffff81df0c6b RDI: 0000000000000003
RBP: ffff888081790a5c R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff81df0c56 R11: 0000000000000000 R12: ffff888081790a00
R13: 0000000000000000 R14: ffff888081790a30 R15: ffff888027a159a0
FS:  00007fd89ee70700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000519cb0 CR3: 0000000032dd5000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __wake_up_common+0x147/0x650 kernel/sched/wait.c:108
 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:138
 n_tty_set_termios+0x73a/0x1010 drivers/tty/n_tty.c:1806
 tty_set_termios+0x650/0x910 drivers/tty/tty_ioctl.c:365
 set_termios.part.0+0x30e/0x530 drivers/tty/tty_ioctl.c:438
 set_termios drivers/tty/tty_ioctl.c:392 [inline]
 tty_mode_ioctl+0xd57/0xe70 drivers/tty/tty_ioctl.c:747
 n_tty_ioctl_helper+0x53/0x2d0 drivers/tty/tty_ioctl.c:907
 n_tty_ioctl+0x56/0x370 drivers/tty/n_tty.c:2421
 tty_ioctl+0xef9/0x1600 drivers/tty/tty_io.c:2814
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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:00007fd89ee70188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000020000300 RSI: 00000000402c542d RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffed78dab2f R14: 00007fd89ee70300 R15: 0000000000022000