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KMSAN: uninit-value in do_error_trap

Status: closed as invalid on 2018/06/27 15:18
Subsystems: net
[Documentation on labels]
First crash: 2699d, last: 2661d

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
CPU: 0 PID: 4553 Comm: syz-executor266 Not tainted 4.16.0+ #87
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+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:316
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:tcp_sacktag_write_queue+0x453b/0x4610 net/ipv4/tcp_input.c:1804
RSP: 0018:ffff88019a35f1a0 EFLAGS: 00010293
RAX: ffffffff88519d4b RBX: 0000000000000000 RCX: ffff8801ca588000
RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff88019a35f358 R08: 0000000000000000 R09: 000077ff80000000
R10: 0000000000000001 R11: ffff88019a350000 R12: 0000000000000009
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000a
 tcp_ack+0x20e8/0x8800 net/ipv4/tcp_input.c:3582
 tcp_rcv_established+0xfc1/0x2bb0 net/ipv4/tcp_input.c:5457
 tcp_v4_do_rcv+0x6cd/0xd90 net/ipv4/tcp_ipv4.c:1469
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __release_sock+0x2d6/0x680 net/core/sock.c:2271
 release_sock+0x97/0x2a0 net/core/sock.c:2786
 tcp_sendmsg+0xd6/0x100 net/ipv4/tcp.c:1464
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 sock_write_iter+0x3b9/0x470 net/socket.c:909
 do_iter_readv_writev+0x84d/0xa00 include/linux/fs.h:1776
 do_iter_write+0x30d/0xd40 fs/read_write.c:932
 vfs_writev fs/read_write.c:977 [inline]
 do_writev+0x3c9/0x830 fs/read_write.c:1012
 SYSC_writev+0x9b/0xb0 fs/read_write.c:1085
 SyS_writev+0x56/0x80 fs/read_write.c:1082
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x440419
RSP: 002b:00007ffd837374b8 EFLAGS: 00000217 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440419
RDX: 0000000000000001 RSI: 00000000200006c0 RDI: 0000000000000003
RBP: 00000000006cb018 R08: 0000000000000010 R09: 0000000000000010
R10: 0000000000000182 R11: 0000000000000217 R12: 0000000000401d40
R13: 0000000000401dd0 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----flags.i.i.i.i.i.i@__kmalloc
Variable was created at:
 __kmalloc+0x3c/0x350 mm/slub.c:3772
 kmalloc include/linux/slab.h:517 [inline]
 tcpm_new net/ipv4/tcp_metrics.c:182 [inline]
 tcp_get_metrics+0x1869/0x2c70 net/ipv4/tcp_metrics.c:309
==================================================================

Crashes (769):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/02 23:59 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/04/28 19:11 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report syz C ci-upstream-kmsan-gce
2018/04/27 22:13 https://github.com/google/kmsan.git master d2d741e5d189 7785e404 .config console log report syz C ci-upstream-kmsan-gce
2018/04/11 01:52 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report syz C ci-upstream-kmsan-gce
2018/04/08 01:51 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report syz C ci-upstream-kmsan-gce
2018/05/02 13:51 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz ci-upstream-kmsan-gce
2018/04/17 01:58 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report syz ci-upstream-kmsan-gce
2018/05/14 17:08 https://github.com/google/kmsan.git master 9bad779decc0 9467cacb .config console log report ci-upstream-kmsan-gce
2018/05/14 15:47 https://github.com/google/kmsan.git master 9bad779decc0 9467cacb .config console log report ci-upstream-kmsan-gce
2018/05/14 09:50 https://github.com/google/kmsan.git master 9bad779decc0 2407e740 .config console log report ci-upstream-kmsan-gce
2018/05/14 05:46 https://github.com/google/kmsan.git master 9bad779decc0 481f030c .config console log report ci-upstream-kmsan-gce
2018/05/14 02:07 https://github.com/google/kmsan.git master 9bad779decc0 481f030c .config console log report ci-upstream-kmsan-gce
2018/05/13 23:31 https://github.com/google/kmsan.git master 9bad779decc0 481f030c .config console log report ci-upstream-kmsan-gce
2018/05/13 15:26 https://github.com/google/kmsan.git master 9bad779decc0 c05b619d .config console log report ci-upstream-kmsan-gce
2018/05/13 11:22 https://github.com/google/kmsan.git master 9bad779decc0 c05b619d .config console log report ci-upstream-kmsan-gce
2018/05/13 01:54 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 10:46 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 09:16 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/11 21:25 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 07:42 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 05:48 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 02:24 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 21:28 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 18:34 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 15:07 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 13:55 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 20:29 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 17:57 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 14:59 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/08 15:49 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/08 13:26 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/08 11:30 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/08 07:05 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/07 23:44 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 17:33 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 14:08 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 11:10 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 08:20 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 06:23 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 02:32 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/06 21:32 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 17:40 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 15:07 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 08:45 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/06 03:08 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/06 01:55 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/05 21:26 https://github.com/google/kmsan.git master d2d741e5d189 6a0382b5 .config console log report ci-upstream-kmsan-gce
2018/05/05 20:07 https://github.com/google/kmsan.git master d2d741e5d189 6a0382b5 .config console log report ci-upstream-kmsan-gce
2018/05/05 18:43 https://github.com/google/kmsan.git master d2d741e5d189 6a0382b5 .config console log report ci-upstream-kmsan-gce
2018/05/05 13:38 https://github.com/google/kmsan.git master d2d741e5d189 6a0382b5 .config console log report ci-upstream-kmsan-gce
2018/05/05 11:23 https://github.com/google/kmsan.git master d2d741e5d189 6a0382b5 .config console log report ci-upstream-kmsan-gce
2018/05/05 09:32 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/05 06:30 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/04/07 00:14 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.