device lo entered promiscuous mode ================================================================== BUG: KMSAN: uninit-value in on_stack arch/x86/include/asm/stacktrace.h:44 [inline] BUG: KMSAN: uninit-value in update_stack_state+0x4ec/0xa40 arch/x86/kernel/unwind_frame.c:238 CPU: 0 PID: 6383 Comm: syz-executor6 Not tainted 4.16.0+ #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676 on_stack arch/x86/include/asm/stacktrace.h:44 [inline] update_stack_state+0x4ec/0xa40 arch/x86/kernel/unwind_frame.c:238 unwind_next_frame+0x618/0xe50 arch/x86/kernel/unwind_frame.c:329 __unwind_start+0x508/0x630 arch/x86/kernel/unwind_frame.c:414 unwind_start arch/x86/include/asm/unwind.h:54 [inline] __save_stack_trace+0x3e1/0xa80 arch/x86/kernel/stacktrace.c:43 save_stack_trace+0xa5/0xf0 arch/x86/kernel/stacktrace.c:60 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline] kmsan_save_stack mm/kmsan/kmsan.c:293 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:526 kmsan_copy_to_user+0x132/0x160 mm/kmsan/kmsan.c:1211 copy_to_user include/linux/uaccess.h:184 [inline] simple_read_from_buffer+0x24d/0x3d0 fs/libfs.c:634 proc_loginuid_read+0x34f/0x410 fs/proc/base.c:1237 do_loop_readv_writev fs/read_write.c:673 [inline] do_iter_read+0x880/0xd70 fs/read_write.c:897 vfs_readv+0x1ec/0x260 fs/read_write.c:959 kernel_readv fs/splice.c:361 [inline] default_file_splice_read+0xa9a/0x1120 fs/splice.c:416 ? 0xffffffff81000000 do_splice_to fs/splice.c:880 [inline] splice_direct_to_actor+0x4c6/0x1040 fs/splice.c:952 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x1067/0x1e40 fs/read_write.c:1413 SYSC_sendfile64+0x1b3/0x300 fs/read_write.c:1468 SyS_sendfile64+0x64/0x90 fs/read_write.c:1460 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x455319 RSP: 002b:00007f706bed3c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f706bed46d4 RCX: 0000000000455319 RDX: 0000000020000040 RSI: 0000000000000014 RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004c6 R14: 00000000006fa330 R15: 0000000000000000 Local variable description: ----c.i.i.i@__free_pages Variable was created at: __free_pages+0x76/0x240 mm/page_alloc.c:4317 free_thread_stack kernel/fork.c:268 [inline] release_task_stack kernel/fork.c:355 [inline] put_task_stack+0x233/0x2f0 kernel/fork.c:366 ==================================================================