------------[ cut here ]------------ WARNING: CPU: 1 PID: 7208 at net/kcm/kcmsock.c:630 kcm_write_msgs+0xf90/0x110c net/kcm/kcmsock.c:630 Modules linked in: CPU: 1 UID: 0 PID: 7208 Comm: syz-executor.5 Not tainted 6.16.0-rc7-syzkaller-g29e0a1d9558f #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kcm_write_msgs+0xf90/0x110c net/kcm/kcmsock.c:630 lr : kcm_write_msgs+0xf90/0x110c net/kcm/kcmsock.c:630 sp : ffff8000a1667540 x29: ffff8000a16676e0 x28: ffff0000e49181c0 x27: dfff800000000000 x26: ffff0000c7d723e0 x25: ffff0000c7d71e00 x24: ffff0000c631bc10 x23: ffff0000c7d720b0 x22: ffff0000cf337580 x21: ffff0000c631bc0c x20: 0000000000000000 x19: 1fffe00018c63781 x18: 1fffe000337d6476 x17: ffff80010c8e2000 x16: ffff80008ae69508 x15: 000000000000000d x14: 1ffff000142ccec4 x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000142cced1 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000e895bd00 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : 0000000000000020 x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: kcm_write_msgs+0xf90/0x110c net/kcm/kcmsock.c:630 (P) kcm_sendmsg+0x20fc/0x2608 net/kcm/kcmsock.c:907 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] sock_write_iter+0x25c/0x378 net/socket.c:1131 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x62c/0x97c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 618 hardirqs last enabled at (617): [] __local_bh_enable_ip+0x1ec/0x35c kernel/softirq.c:412 hardirqs last disabled at (618): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (616): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (616): [] release_sock+0x14c/0x1ac net/core/sock.c:3776 softirqs last disabled at (612): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (612): [] __release_sock+0x310/0x39c net/core/sock.c:3220 ---[ end trace 0000000000000000 ]--- KCM: Hard failure on kcm_write_msgs