===================================================== BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x5d0/0xf50 net/caif/caif_socket.c:542 caif_seqpkt_sendmsg+0x5d0/0xf50 net/caif/caif_socket.c:542 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2337 __sys_sendmsg_sock+0x9f/0xc0 net/socket.c:2403 io_sendmsg fs/io_uring.c:4372 [inline] io_issue_sqe+0x55de/0x14cc0 fs/io_uring.c:6140 __io_queue_sqe+0x2e4/0xd50 fs/io_uring.c:6419 io_queue_sqe+0x2b3/0x13b0 fs/io_uring.c:6468 io_submit_sqe+0x77fa/0xa190 fs/io_uring.c:6631 io_submit_sqes+0xf50/0x1e60 fs/io_uring.c:6739 __do_sys_io_uring_enter fs/io_uring.c:9336 [inline] __se_sys_io_uring_enter+0x5e1/0x2300 fs/io_uring.c:9278 __ia32_sys_io_uring_enter+0x1a0/0x200 fs/io_uring.c:9278 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline] __do_fast_syscall_32+0x96/0xe0 arch/x86/entry/common.c:145 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:170 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:213 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Local variable ----iomsg.i@io_issue_sqe created at: io_sendmsg fs/io_uring.c:4348 [inline] io_issue_sqe+0x3399/0x14cc0 fs/io_uring.c:6140 __io_queue_sqe+0x2e4/0xd50 fs/io_uring.c:6419 ===================================================== Kernel panic - not syncing: panic_on_kmsan set ... CPU: 0 PID: 13266 Comm: syz-executor.2 Tainted: G B 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x25a/0x2f6 lib/dump_stack.c:120 panic+0x4c7/0xe98 kernel/panic.c:231 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186 __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208 caif_seqpkt_sendmsg+0x5d0/0xf50 net/caif/caif_socket.c:542 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2337 __sys_sendmsg_sock+0x9f/0xc0 net/socket.c:2403 io_sendmsg fs/io_uring.c:4372 [inline] io_issue_sqe+0x55de/0x14cc0 fs/io_uring.c:6140 __io_queue_sqe+0x2e4/0xd50 fs/io_uring.c:6419 io_queue_sqe+0x2b3/0x13b0 fs/io_uring.c:6468 io_submit_sqe+0x77fa/0xa190 fs/io_uring.c:6631 io_submit_sqes+0xf50/0x1e60 fs/io_uring.c:6739 __do_sys_io_uring_enter fs/io_uring.c:9336 [inline] __se_sys_io_uring_enter+0x5e1/0x2300 fs/io_uring.c:9278 __ia32_sys_io_uring_enter+0x1a0/0x200 fs/io_uring.c:9278 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline] __do_fast_syscall_32+0x96/0xe0 arch/x86/entry/common.c:145 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:170 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:213 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6f35549 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:00000000f452f5fc EFLAGS: 00000296 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000000450e RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi