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KMSAN: uninit-value in __x64_sys_futex

Status: closed as invalid on 2018/09/19 14:33
Subsystems: kernel
[Documentation on labels]
First crash: 2190d, last: 2075d

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: uninit-value in __x64_sys_futex+0x1b9/0x200 kernel/futex.c:3555
CPU: 1 PID: 4508 Comm: syz-executor463 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
 __x64_sys_futex+0x1b9/0x200 kernel/futex.c:3555
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4458a9
RSP: 002b:00007f5d39225db8 EFLAGS: 00000202 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 00000000004458a9
RDX: 00000000004458a9 RSI: 0000000000000001 RDI: 00000000006dac3c
RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f5d39226700 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffc3c1fc0bf R14: 00007f5d392269c0 R15: 0000000000000001

Local variable description: ----msg_sys@__sys_sendmmsg
Variable was created at:
 __sys_sendmmsg+0x9c/0x850 net/socket.c:2173
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x11c/0x170 net/socket.c:2238
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4508 Comm: syz-executor463 Tainted: G    B             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
 panic+0x39d/0x940 kernel/panic.c:184
 kmsan_report+0x238/0x240 mm/kmsan/kmsan.c:1083
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 __x64_sys_futex+0x1b9/0x200 kernel/futex.c:3555
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4458a9
RSP: 002b:00007f5d39225db8 EFLAGS: 00000202 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 00000000004458a9
RDX: 00000000004458a9 RSI: 0000000000000001 RDI: 00000000006dac3c
RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f5d39226700 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffc3c1fc0bf R14: 00007f5d392269c0 R15: 0000000000000001
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (165):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/09 13:47 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report syz C ci-upstream-kmsan-gce
2018/08/31 17:41 https://github.com/google/kmsan.git master ab98bd30a4ba a4718693 .config console log report ci-upstream-kmsan-gce
2018/08/31 14:31 https://github.com/google/kmsan.git master ab98bd30a4ba a4718693 .config console log report ci-upstream-kmsan-gce
2018/08/31 12:45 https://github.com/google/kmsan.git master ab98bd30a4ba a4718693 .config console log report ci-upstream-kmsan-gce
2018/08/31 08:05 https://github.com/google/kmsan.git master ab98bd30a4ba a4718693 .config console log report ci-upstream-kmsan-gce
2018/08/31 05:59 https://github.com/google/kmsan.git master ab98bd30a4ba a4718693 .config console log report ci-upstream-kmsan-gce
2018/08/30 22:25 https://github.com/google/kmsan.git master 25114c64b719 938220fd .config console log report ci-upstream-kmsan-gce
2018/08/30 17:47 https://github.com/google/kmsan.git master 25114c64b719 938220fd .config console log report ci-upstream-kmsan-gce
2018/08/30 15:05 https://github.com/google/kmsan.git master 25114c64b719 938220fd .config console log report ci-upstream-kmsan-gce
2018/08/30 12:03 https://github.com/google/kmsan.git master 2dca2cbde67a 6c7e9d3d .config console log report ci-upstream-kmsan-gce
2018/08/30 10:41 https://github.com/google/kmsan.git master 2dca2cbde67a 6c7e9d3d .config console log report ci-upstream-kmsan-gce
2018/08/30 07:56 https://github.com/google/kmsan.git master 2dca2cbde67a 6c7e9d3d .config console log report ci-upstream-kmsan-gce
2018/08/30 03:23 https://github.com/google/kmsan.git master 2dca2cbde67a 6c7e9d3d .config console log report ci-upstream-kmsan-gce
2018/08/30 02:12 https://github.com/google/kmsan.git master 2dca2cbde67a 6c7e9d3d .config console log report ci-upstream-kmsan-gce
2018/08/30 02:10 https://github.com/google/kmsan.git master 2dca2cbde67a 6c7e9d3d .config console log report ci-upstream-kmsan-gce
2018/08/29 19:51 https://github.com/google/kmsan.git master 2dca2cbde67a 4937cb2b .config console log report ci-upstream-kmsan-gce
2018/08/29 18:46 https://github.com/google/kmsan.git master 2dca2cbde67a 4937cb2b .config console log report ci-upstream-kmsan-gce
2018/08/29 14:39 https://github.com/google/kmsan.git master 2dca2cbde67a 53ff8784 .config console log report ci-upstream-kmsan-gce
2018/08/29 10:11 https://github.com/google/kmsan.git master 2dca2cbde67a 53ff8784 .config console log report ci-upstream-kmsan-gce
2018/08/29 08:53 https://github.com/google/kmsan.git master 2dca2cbde67a 53ff8784 .config console log report ci-upstream-kmsan-gce
2018/08/29 07:28 https://github.com/google/kmsan.git master 2dca2cbde67a 53ff8784 .config console log report ci-upstream-kmsan-gce
2018/08/29 06:12 https://github.com/google/kmsan.git master 2dca2cbde67a 53ff8784 .config console log report ci-upstream-kmsan-gce
2018/08/29 02:19 https://github.com/google/kmsan.git master 2dca2cbde67a b771b17e .config console log report ci-upstream-kmsan-gce
2018/08/29 01:04 https://github.com/google/kmsan.git master 2dca2cbde67a b771b17e .config console log report ci-upstream-kmsan-gce
2018/08/28 20:03 https://github.com/google/kmsan.git master 2dca2cbde67a b771b17e .config console log report ci-upstream-kmsan-gce
2018/08/28 18:45 https://github.com/google/kmsan.git master 2dca2cbde67a b771b17e .config console log report ci-upstream-kmsan-gce
2018/06/28 02:11 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/06 14:40 https://github.com/google/kmsan.git master 8fc8ecd1c58a 41f9540d .config console log report ci-upstream-kmsan-gce
2018/06/06 10:29 https://github.com/google/kmsan.git master 8fc8ecd1c58a 41f9540d .config console log report ci-upstream-kmsan-gce
2018/06/06 04:15 https://github.com/google/kmsan.git master 8fc8ecd1c58a 863a24bb .config console log report ci-upstream-kmsan-gce
2018/06/05 23:56 https://github.com/google/kmsan.git master 8fc8ecd1c58a 863a24bb .config console log report ci-upstream-kmsan-gce
2018/06/05 16:44 https://github.com/google/kmsan.git master 8fc8ecd1c58a a316ff92 .config console log report ci-upstream-kmsan-gce
2018/06/05 12:24 https://github.com/google/kmsan.git master 8fc8ecd1c58a a316ff92 .config console log report ci-upstream-kmsan-gce
2018/06/05 09:49 https://github.com/google/kmsan.git master 8fc8ecd1c58a a316ff92 .config console log report ci-upstream-kmsan-gce
2018/06/04 17:55 https://github.com/google/kmsan.git master 8fc8ecd1c58a 6cbe7c26 .config console log report ci-upstream-kmsan-gce
2018/06/04 10:44 https://github.com/google/kmsan.git master 8fc8ecd1c58a 6cbe7c26 .config console log report ci-upstream-kmsan-gce
2018/06/03 10:06 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/06/02 13:33 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/06/01 15:29 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/06/01 10:31 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/06/01 02:19 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/05/31 07:11 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/05/31 00:16 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/05/30 06:44 https://github.com/google/kmsan.git master 1b9cd4eccac9 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/05/08 21:10 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.