================================================================== BUG: KMSAN: uninit-value in is_kernel include/linux/kallsyms.h:41 [inline] BUG: KMSAN: uninit-value in is_ksym_addr include/linux/kallsyms.h:49 [inline] BUG: KMSAN: uninit-value in kallsyms_lookup+0x152/0x910 kernel/kallsyms.c:288 CPU: 0 PID: 10931 Comm: syz-executor2 Not tainted 4.16.0+ #87 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:683 is_kernel include/linux/kallsyms.h:41 [inline] is_ksym_addr include/linux/kallsyms.h:49 [inline] kallsyms_lookup+0x152/0x910 kernel/kallsyms.c:288 __sprint_symbol+0x147/0x5b0 kernel/kallsyms.c:361 sprint_backtrace+0x7f/0x90 kernel/kallsyms.c:429 symbol_string+0x19f/0x230 lib/vsprintf.c:684 pointer+0xdb9/0x1410 lib/vsprintf.c:1870 vsnprintf+0xa2d/0x33c0 lib/vsprintf.c:2286 seq_vprintf fs/seq_file.c:400 [inline] seq_printf+0x29f/0x420 fs/seq_file.c:415 proc_pid_stack+0x326/0x470 fs/proc/base.c:449 proc_single_show+0x1af/0x300 fs/proc/base.c:747 seq_read+0xc7d/0x2260 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:673 [inline] do_iter_read+0x880/0xd70 fs/read_write.c:897 vfs_readv fs/read_write.c:959 [inline] do_readv+0x295/0x5f0 fs/read_write.c:992 SYSC_readv+0x9b/0xb0 fs/read_write.c:1079 SyS_readv+0x56/0x80 fs/read_write.c:1076 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x455979 RSP: 002b:00007fcb96b81c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00007fcb96b826d4 RCX: 0000000000455979 RDX: 0000000000000002 RSI: 0000000020000000 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004da R14: 00000000006fb510 R15: 0000000000000000 Uninit was stored to memory at: 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 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:528 save_stack_address arch/x86/kernel/stacktrace.c:29 [inline] __save_stack_trace+0x829/0xb00 arch/x86/kernel/stacktrace.c:50 save_stack_trace_tsk+0x258/0x2f0 arch/x86/kernel/stacktrace.c:82 proc_pid_stack+0x26a/0x470 fs/proc/base.c:446 proc_single_show+0x1af/0x300 fs/proc/base.c:747 seq_read+0xc7d/0x2260 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:673 [inline] do_iter_read+0x880/0xd70 fs/read_write.c:897 vfs_readv fs/read_write.c:959 [inline] do_readv+0x295/0x5f0 fs/read_write.c:992 SYSC_readv+0x9b/0xb0 fs/read_write.c:1079 SyS_readv+0x56/0x80 fs/read_write.c:1076 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Uninit was stored to memory at: 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 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:528 update_stack_state+0x959/0xa40 arch/x86/kernel/unwind_frame.c:257 unwind_next_frame+0x618/0xe50 arch/x86/kernel/unwind_frame.c:329 __save_stack_trace+0x734/0xb00 arch/x86/kernel/stacktrace.c:48 save_stack_trace_tsk+0x258/0x2f0 arch/x86/kernel/stacktrace.c:82 nla_parse: 5 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'. proc_pid_stack+0x26a/0x470 fs/proc/base.c:446 proc_single_show+0x1af/0x300 fs/proc/base.c:747 seq_read+0xc7d/0x2260 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:673 [inline] do_iter_read+0x880/0xd70 fs/read_write.c:897 vfs_readv fs/read_write.c:959 [inline] do_readv+0x295/0x5f0 fs/read_write.c:992 SYSC_readv+0x9b/0xb0 fs/read_write.c:1079 SyS_readv+0x56/0x80 fs/read_write.c:1076 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Local variable description: ----user_auxv.i.i@SYSC_prctl Variable was created at: SYSC_prctl+0xe7/0x39d0 kernel/sys.c:2195 SyS_prctl+0x76/0xa0 kernel/sys.c:2193 ==================================================================