From: syzbot <syzbot+a37cda34d2b8b740a5f1@syzkaller.appspotmail.com>
To: davem@davemloft.net, glider@google.com, jhs@mojatatu.com,
jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com,
xiyou.wangcong@gmail.com
Subject: KMSAN: uninit-value in tcf_exts_change
Date: Tue, 10 Mar 2020 15:25:13 -0700 [thread overview]
Message-ID: <000000000000e6150305a08797cc@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 8bbbc5cf kmsan: don't compile memmove
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=144ec945e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cd0e9a6b0e555cc3
dashboard link: https://syzkaller.appspot.com/bug?extid=a37cda34d2b8b740a5f1
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=143669fde00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13208061e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a37cda34d2b8b740a5f1@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in tcf_exts_destroy net/sched/cls_api.c:3000 [inline]
BUG: KMSAN: uninit-value in tcf_exts_change+0xc9/0xf0 net/sched/cls_api.c:3059
CPU: 1 PID: 11450 Comm: syz-executor413 Not tainted 5.6.0-rc2-syzkaller #0
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+0x1c9/0x220 lib/dump_stack.c:118
kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
__msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
tcf_exts_destroy net/sched/cls_api.c:3000 [inline]
tcf_exts_change+0xc9/0xf0 net/sched/cls_api.c:3059
tcindex_set_parms net/sched/cls_tcindex.c:456 [inline]
tcindex_change+0x2fe4/0x4130 net/sched/cls_tcindex.c:518
tc_new_tfilter+0x31a8/0x4f40 net/sched/cls_api.c:2103
rtnetlink_rcv_msg+0xcb7/0x1570 net/core/rtnetlink.c:5429
netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5456
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343
___sys_sendmsg net/socket.c:2397 [inline]
__sys_sendmsg+0x451/0x5f0 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg+0x97/0xb0 net/socket.c:2437
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2437
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x441829
Code: e8 2c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff944e1698 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441829
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00000000004a2b10 R08: 0000000120080522 R09: 0000000120080522
R10: 0000000120080522 R11: 0000000000000246 R12: 0000000000402640
R13: 00000000004026d0 R14: 0000000000000000 R15: 0000000000000000
Uninit was created at:
kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144
kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:307 [inline]
kmsan_alloc_page+0x12a/0x310 mm/kmsan/kmsan_shadow.c:336
__alloc_pages_nodemask+0x5712/0x5e80 mm/page_alloc.c:4775
alloc_pages_current+0x67d/0x990 mm/mempolicy.c:2211
alloc_pages include/linux/gfp.h:534 [inline]
alloc_slab_page+0x111/0x12f0 mm/slub.c:1530
allocate_slab mm/slub.c:1675 [inline]
new_slab+0x2bc/0x1130 mm/slub.c:1741
new_slab_objects mm/slub.c:2492 [inline]
___slab_alloc+0x1533/0x1f30 mm/slub.c:2643
__slab_alloc mm/slub.c:2683 [inline]
slab_alloc_node mm/slub.c:2757 [inline]
slab_alloc mm/slub.c:2802 [inline]
kmem_cache_alloc_trace+0xb0a/0xd70 mm/slub.c:2819
kmalloc include/linux/slab.h:555 [inline]
kzalloc include/linux/slab.h:669 [inline]
tcindex_set_parms net/sched/cls_tcindex.c:325 [inline]
tcindex_change+0x5bd/0x4130 net/sched/cls_tcindex.c:518
tc_new_tfilter+0x31a8/0x4f40 net/sched/cls_api.c:2103
rtnetlink_rcv_msg+0xcb7/0x1570 net/core/rtnetlink.c:5429
netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5456
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343
___sys_sendmsg net/socket.c:2397 [inline]
__sys_sendmsg+0x451/0x5f0 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg+0x97/0xb0 net/socket.c:2437
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2437
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
---
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next reply other threads:[~2020-03-10 22:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-10 22:25 syzbot [this message]
2020-03-16 18:38 ` KMSAN: uninit-value in tcf_exts_change Cong Wang
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