------------[ cut here ]------------ WARNING: CPU: 1 PID: 14144 at net/kcm/kcmsock.c:634 kcm_write_msgs+0x11e9/0x14b0 Modules linked in: CPU: 1 PID: 14144 Comm: syz-executor.2 Not tainted 6.1.63-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:kcm_write_msgs+0x11e9/0x14b0 net/kcm/kcmsock.c:634 Code: 5c 24 14 89 de e8 37 93 ca f7 85 db 8b 44 24 28 0f 45 c3 48 81 c4 90 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b7 8f ca f7 <0f> 0b e9 33 ff ff ff e8 ab 8f ca f7 0f 0b e9 2d f6 ff ff e8 9f 8f RSP: 0018:ffffc90005447878 EFLAGS: 00010283 RAX: ffffffff89c00039 RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc9000bfa9000 RSI: 0000000000005cd8 RDI: 0000000000005cd9 RBP: dffffc0000000000 R08: ffffffff89bff78a R09: fffffbfff2091a6c R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807a7420c0 R13: ffff88806cd6c140 R14: ffff88808df2d000 R15: ffff888075525280 FS: 00007fc6d73fe6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002002b000 CR3: 0000000079026000 CR4: 00000000003506e0 Call Trace: kcm_sendmsg+0x1f72/0x2580 net/kcm/kcmsock.c:1040 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] sock_write_iter+0x394/0x4e0 net/socket.c:1130 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7ae/0xba0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc6d887cae9 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:00007fc6d73fe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc6d899c120 RCX: 00007fc6d887cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fc6d88c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fc6d899c120 R15: 00007fff71933d38