================================================================== 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: 7517 Comm: syz-executor4 Not tainted 4.17.0-rc3+ #88 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:113 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:694 pointer+0xdb9/0x1410 lib/vsprintf.c:1880 vsnprintf+0xa2d/0x33c0 lib/vsprintf.c:2296 seq_vprintf fs/seq_file.c:403 [inline] seq_printf+0x29f/0x420 fs/seq_file.c:418 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:240 do_loop_readv_writev fs/read_write.c:700 [inline] do_iter_read+0x880/0xd70 fs/read_write.c:924 vfs_readv fs/read_write.c:986 [inline] do_preadv+0x3a1/0x580 fs/read_write.c:1070 __do_sys_preadv fs/read_write.c:1120 [inline] __se_sys_preadv fs/read_write.c:1115 [inline] __x64_sys_preadv+0x120/0x170 fs/read_write.c:1115 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455979 RSP: 002b:00007f7bc2a83c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f7bc2a846d4 RCX: 0000000000455979 RDX: 10000000000000d5 RSI: 0000000020000500 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004bd R14: 00000000006fb258 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:240 do_loop_readv_writev fs/read_write.c:700 [inline] do_iter_read+0x880/0xd70 fs/read_write.c:924 vfs_readv fs/read_write.c:986 [inline] do_preadv+0x3a1/0x580 fs/read_write.c:1070 __do_sys_preadv fs/read_write.c:1120 [inline] __se_sys_preadv fs/read_write.c:1115 [inline] __x64_sys_preadv+0x120/0x170 fs/read_write.c:1115 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 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 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:240 do_loop_readv_writev fs/read_write.c:700 [inline] do_iter_read+0x880/0xd70 fs/read_write.c:924 vfs_readv fs/read_write.c:986 [inline] do_preadv+0x3a1/0x580 fs/read_write.c:1070 __do_sys_preadv fs/read_write.c:1120 [inline] __se_sys_preadv fs/read_write.c:1115 [inline] __x64_sys_preadv+0x120/0x170 fs/read_write.c:1115 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Local variable description: ----c.i.i.i.i@__block_write_begin_int Variable was created at: __block_write_begin_int+0xe8/0x2910 fs/buffer.c:1929 __block_write_begin fs/buffer.c:2013 [inline] block_page_mkwrite+0x495/0x980 fs/buffer.c:2476 ==================================================================