RDX: 00000001000001d8 RSI: 00000000200000c0 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000007b1 R14: 0000000000700938 R15: 0000000000000004
==================================================================
BUG: KMSAN: uninit-value in _copy_to_user+0x12f/0x180 lib/usercopy.c:26
CPU: 1 PID: 4364 Comm: rsyslogd Not tainted 4.17.0-rc5+ #1
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+0x149/0x260 mm/kmsan/kmsan.c:1084
 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:685
 _copy_to_user+0x12f/0x180 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:183 [inline]
 syslog_print kernel/printk/printk.c:1344 [inline]
 do_syslog+0x3936/0x3c20 kernel/printk/printk.c:1467
 kmsg_read+0x142/0x1a0 fs/proc/kmsg.c:40
 proc_reg_read+0x1e3/0x2f0 fs/proc/inode.c:230
 __vfs_read+0x1b2/0x9d0 fs/read_write.c:416
 vfs_read+0x36c/0x6b0 fs/read_write.c:452
 ksys_read fs/read_write.c:578 [inline]
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x1bf/0x3e0 fs/read_write.c:586
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7faa385dd1fd
RSP: 002b:00007faa35b7ce30 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000006de670 RCX: 00007faa385dd1fd
RDX: 0000000000000fff RSI: 00007faa373b15a0 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00000000006c9260 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000293 R12: 000000000065e420
R13: 00007faa35b7d9c0 R14: 00007faa38c22040 R15: 0000000000000003

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:294 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:529
 log_store+0x13fc/0x14b0 kernel/printk/printk.c:641
 log_output kernel/printk/printk.c:1832 [inline]
 vprintk_emit+0xca5/0x1060 kernel/printk/printk.c:1897
 vprintk_default+0x90/0xa0 kernel/printk/printk.c:1955
 vprintk_func+0x517/0x700 kernel/printk/printk_safe.c:379
 printk+0x1b6/0x1f0 kernel/printk/printk.c:1991
 printk_stack_address arch/x86/kernel/dumpstack.c:69 [inline]
 show_trace_log_lvl+0xb5c/0x10a0 arch/x86/kernel/dumpstack.c:205
 show_stack+0xfc/0x150 arch/x86/kernel/dumpstack.c:241
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x87b/0xab0 lib/fault-inject.c:149
 should_fail_alloc_page mm/page_alloc.c:3089 [inline]
 prepare_alloc_pages mm/page_alloc.c:4329 [inline]
 __alloc_pages_nodemask+0x600/0x5cc0 mm/page_alloc.c:4365
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 __get_free_pages+0x2d/0xc0 mm/page_alloc.c:4423
 tlb_next_batch mm/memory.c:204 [inline]
 __tlb_remove_page_size mm/memory.c:316 [inline]
 __tlb_remove_page include/asm-generic/tlb.h:150 [inline]
 zap_pte_range mm/memory.c:1340 [inline]
 zap_pmd_range mm/memory.c:1441 [inline]
 zap_pud_range mm/memory.c:1470 [inline]
 zap_p4d_range mm/memory.c:1491 [inline]
 unmap_page_range+0x26d2/0x3be0 mm/memory.c:1512
 unmap_single_vma+0x445/0x5e0 mm/memory.c:1557
 unmap_vmas+0x1f4/0x360 mm/memory.c:1587
 exit_mmap+0x4d7/0x980 mm/mmap.c:3105
 __mmput+0x158/0x600 kernel/fork.c:962
 mmput+0xab/0xf0 kernel/fork.c:983
 exit_mm+0x6ed/0x7a0 kernel/exit.c:545
 do_exit+0xc12/0x3930 kernel/exit.c:854
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0x1405/0x1ec0 kernel/signal.c:2482
 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xe9/0x710 arch/x86/entry/common.c:265
 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Local variable description: ----info.i.i@get_signal
Variable was created at:
 get_signal+0x6f/0x1ec0 kernel/signal.c:2306
 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810
==================================================================