------------[ cut here ]------------
WARNING: CPU: 0 PID: 1784 at fs/read_write.c:504 __kernel_write_iter+0x5b4/0x7b0 fs/read_write.c:504
Modules linked in:
CPU: 0 PID: 1784 Comm: syz-executor.2 Not tainted 6.6.0-syzkaller-15029-gbe3ca57cfb77 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:__kernel_write_iter+0x5b4/0x7b0 fs/read_write.c:504
Code: c7 a0 af 17 8d e8 cc 01 84 08 31 ff 89 c5 89 c6 e8 01 33 9a ff 85 ed 75 1f 48 c7 c5 ea ff ff ff e9 0b ff ff ff e8 7c 37 9a ff <0f> 0b 48 c7 c5 f7 ff ff ff e9 f8 fe ff ff e8 69 37 9a ff 48 b8 00
RSP: 0018:ffffc9001654f6a0 EFLAGS: 00010283
RAX: 0000000000005cda RBX: ffff888019792f00 RCX: ffffc9000ab72000
RDX: 0000000000040000 RSI: ffffffff81ee6504 RDI: 0000000000000005
RBP: 00000000000a801d R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802f8dc008
R13: 1ffff92002ca9ed6 R14: 0000000000000000 R15: ffff888019792f50
FS:  00007f0e6432e6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe08859e68 CR3: 000000001e7b6000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __kernel_write fs/read_write.c:537 [inline]
 kernel_write fs/read_write.c:558 [inline]
 kernel_write+0x1f8/0x6c0 fs/read_write.c:548
 write_buf fs/btrfs/send.c:648 [inline]
 send_header fs/btrfs/send.c:766 [inline]
 send_subvol fs/btrfs/send.c:7936 [inline]
 btrfs_ioctl_send+0x2313/0x6b70 fs/btrfs/send.c:8312
 _btrfs_ioctl_send+0x117/0x2f0 fs/btrfs/ioctl.c:4369
 btrfs_ioctl+0x3881/0x5d90 fs/btrfs/ioctl.c:4660
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f0e6367cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0e6432e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0e6379c050 RCX: 00007f0e6367cae9
RDX: 0000000020000700 RSI: 0000000040489426 RDI: 0000000000000003
RBP: 00007f0e636c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f0e6379c050 R15: 00007fff2341f6a8
 </TASK>