===================================================== 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 net/socket.c:2391 [inline] __sys_sendmsg+0x704/0x840 net/socket.c:2420 __compat_sys_sendmsg net/compat.c:347 [inline] __do_compat_sys_sendmsg net/compat.c:354 [inline] __se_compat_sys_sendmsg net/compat.c:351 [inline] __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351 do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline] __do_fast_syscall_32+0x96/0xe0 arch/x86/entry/common.c:149 do_fast_syscall_32+0x3c/0x80 arch/x86/entry/common.c:179 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:222 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Local variable ----iovstack.i@__sys_sendmsg created at: ___sys_sendmsg net/socket.c:2382 [inline] __sys_sendmsg+0x342/0x840 net/socket.c:2420 __compat_sys_sendmsg net/compat.c:347 [inline] __do_compat_sys_sendmsg net/compat.c:354 [inline] __se_compat_sys_sendmsg net/compat.c:351 [inline] __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351 ===================================================== Kernel panic - not syncing: panic_on_kmsan set ... CPU: 0 PID: 17500 Comm: syz-executor.3 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:179 __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:205 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 net/socket.c:2391 [inline] __sys_sendmsg+0x704/0x840 net/socket.c:2420 __compat_sys_sendmsg net/compat.c:347 [inline] __do_compat_sys_sendmsg net/compat.c:354 [inline] __se_compat_sys_sendmsg net/compat.c:351 [inline] __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351 do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline] __do_fast_syscall_32+0x96/0xe0 arch/x86/entry/common.c:149 do_fast_syscall_32+0x3c/0x80 arch/x86/entry/common.c:179 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:222 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f57549 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:00000000f55515fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000240 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