syz3 __alloc_pages_may_oom mm/page_alloc.c:3415 [inline] __alloc_pages_slowpath mm/page_alloc.c:4116 [inline] __alloc_pages_nodemask+0x4ee3/0x5dc0 mm/page_alloc.c:4272 mems_allowed=0 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055 ================================================================== BUG: KMSAN: uninit-value in show_trace_log_lvl+0xda4/0x1030 arch/x86/kernel/dumpstack.c:203 CPU: 0 PID: 3451 Comm: rsyslogd 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+0x14a/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 show_trace_log_lvl+0xda4/0x1030 arch/x86/kernel/dumpstack.c:203 show_stack+0xfc/0x150 arch/x86/kernel/dumpstack.c:236 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 dump_header+0x2cc/0x16f0 mm/oom_kill.c:437 oom_kill_process+0x341/0x2160 mm/oom_kill.c:866 out_of_memory+0x1700/0x1da0 mm/oom_kill.c:1080 __alloc_pages_may_oom mm/page_alloc.c:3415 [inline] __alloc_pages_slowpath mm/page_alloc.c:4116 [inline] __alloc_pages_nodemask+0x4ee3/0x5dc0 mm/page_alloc.c:4272 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055 alloc_pages include/linux/gfp.h:494 [inline] __page_cache_alloc+0x95/0x320 mm/filemap.c:945 page_cache_read mm/filemap.c:2387 [inline] filemap_fault+0x1618/0x24e0 mm/filemap.c:2571 ext4_filemap_fault+0xbb/0x130 fs/ext4/inode.c:6177 __do_fault mm/memory.c:3238 [inline] do_read_fault mm/memory.c:3648 [inline] do_fault mm/memory.c:3748 [inline] handle_pte_fault mm/memory.c:3979 [inline] __handle_mm_fault mm/memory.c:4103 [inline] handle_mm_fault+0x58fe/0x7ba0 mm/memory.c:4140 __do_page_fault+0xec4/0x1a10 arch/x86/mm/fault.c:1423 do_page_fault+0xd3/0x260 arch/x86/mm/fault.c:1500 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1151 RIP: 0033:0x7f0c4b69d1fd RSP: 002b:00007f0c48c3ce30 EFLAGS: 00010293 RAX: 0000000000000071 RBX: 00000000014bcce0 RCX: 00007f0c4b69d1fd RDX: 0000000000000fff RSI: 00007f0c4a4715a0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00000000014a8260 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000293 R12: 000000000065e420 R13: 00007f0c48c3d9c0 R14: 00007f0c4bce2040 R15: 0000000000000003 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:521 update_stack_state+0x9e2/0xa40 arch/x86/kernel/unwind_frame.c:261 unwind_next_frame+0x618/0xe50 arch/x86/kernel/unwind_frame.c:329 show_trace_log_lvl+0xb49/0x1030 arch/x86/kernel/dumpstack.c:212 show_stack+0xfc/0x150 arch/x86/kernel/dumpstack.c:236 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 dump_header+0x2cc/0x16f0 mm/oom_kill.c:437 oom_kill_process+0x341/0x2160 mm/oom_kill.c:866 out_of_memory+0x1700/0x1da0 mm/oom_kill.c:1080 __alloc_pages_may_oom mm/page_alloc.c:3415 [inline] __alloc_pages_slowpath mm/page_alloc.c:4116 [inline] __alloc_pages_nodemask+0x4ee3/0x5dc0 mm/page_alloc.c:4272 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055 alloc_pages include/linux/gfp.h:494 [inline] __page_cache_alloc+0x95/0x320 mm/filemap.c:945 page_cache_read mm/filemap.c:2387 [inline] filemap_fault+0x1618/0x24e0 mm/filemap.c:2571 ext4_filemap_fault+0xbb/0x130 fs/ext4/inode.c:6177 __do_fault mm/memory.c:3238 [inline] do_read_fault mm/memory.c:3648 [inline] do_fault mm/memory.c:3748 [inline] handle_pte_fault mm/memory.c:3979 [inline] __handle_mm_fault mm/memory.c:4103 [inline] handle_mm_fault+0x58fe/0x7ba0 mm/memory.c:4140 __do_page_fault+0xec4/0x1a10 arch/x86/mm/fault.c:1423 do_page_fault+0xd3/0x260 arch/x86/mm/fault.c:1500 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1151 Local variable description: ----compact_result.i@__alloc_pages_nodemask Variable was created at: __alloc_pages_nodemask+0x17b/0x5dc0 mm/page_alloc.c:4238 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055 ==================================================================