syzbot


KMSAN: uninit-value in report_bug

Status: closed as invalid on 2018/06/27 15:18
Subsystems: bpf
[Documentation on labels]
First crash: 2646d, last: 2646d

Sample crash report:
RDX: 000000000000001a RSI: 0000000000000001 RDI: 0000000000000003
RBP: 000000000072bea0 R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000440 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000579 R14: 00000000006fc3f8 R15: 000000000000000c
==================================================================
BUG: KMSAN: uninit-value in find_bug lib/bug.c:137 [inline]
BUG: KMSAN: uninit-value in report_bug+0x110/0x880 lib/bug.c:152
CPU: 1 PID: 4565 Comm: syz-executor0 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
 find_bug lib/bug.c:137 [inline]
 report_bug+0x110/0x880 lib/bug.c:152
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x1aa/0x600 arch/x86/kernel/traps.c:297
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:bpf_prog_lock_ro include/linux/filter.h:651 [inline]
RIP: 0010:bpf_prog_select_runtime+0x95b/0xa40 kernel/bpf/core.c:1514
RSP: 0018:ffff88019bf9fa00 EFLAGS: 00010293
RAX: ffffffff8176fecb RBX: ffff8801d8b9e098 RCX: ffff8801d8b9d7c0
RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff88019bf9fad0 R08: 00000000000000a3 R09: ffff88019afcf7a0
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000004 R14: 00000000fffffff4 R15: ffffc900018b5000
 bpf_migrate_filter net/core/filter.c:1069 [inline]
 bpf_prepare_filter+0x1a96/0x1b10 net/core/filter.c:1117
 __get_filter+0x5b7/0x7d0 net/core/filter.c:1310
 sk_attach_filter+0x72/0x2e0 net/core/filter.c:1325
 sock_setsockopt+0x336e/0x46f0 net/core/sock.c:928
 __sys_setsockopt+0x33e/0x560 net/socket.c:1899
 __do_sys_setsockopt net/socket.c:1914 [inline]
 __se_sys_setsockopt net/socket.c:1911 [inline]
 __x64_sys_setsockopt+0x15c/0x1c0 net/socket.c:1911
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455979
RSP: 002b:00007ffe1bf8bba8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000ffb914 RCX: 0000000000455979
RDX: 000000000000001a RSI: 0000000000000001 RDI: 0000000000000003
RBP: 000000000072bea0 R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000440 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000579 R14: 00000000006fc3f8 R15: 000000000000000c

Local variable description: ----c.i.i.i@release_pages
Variable was created at:
 release_pages+0x67/0x1670 mm/swap.c:715
 pagevec_lru_move_fn+0x488/0x4e0 mm/swap.c:213
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/09 17:07 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report syz ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.