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* KMSAN: uninit-value in can_receive
@ 2019-11-18 19:05 syzbot
  2019-11-18 20:25 ` Oliver Hartkopp
  2019-11-26  9:00 ` syzbot
  0 siblings, 2 replies; 17+ messages in thread
From: syzbot @ 2019-11-18 19:05 UTC (permalink / raw)
  To: davem, glider, linux-can, linux-kernel, mkl, netdev, socketcan,
	syzkaller-bugs

Hello,

syzbot found the following crash on:

HEAD commit:    9c6a7162 kmsan: remove unneeded annotations in bio
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=14563416e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360
dashboard link: https://syzkaller.appspot.com/bug?extid=b02ff0707a97e4e79ebb
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b02ff0707a97e4e79ebb@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in can_receive+0x23c/0x5e0 net/can/af_can.c:649
CPU: 1 PID: 3490 Comm: syz-executor.2 Not tainted 5.4.0-rc5+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x191/0x1f0 lib/dump_stack.c:113
  kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108
  __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245
  can_receive+0x23c/0x5e0 net/can/af_can.c:649
  can_rcv+0x188/0x3a0 net/can/af_can.c:685
  __netif_receive_skb_one_core net/core/dev.c:5010 [inline]
  __netif_receive_skb net/core/dev.c:5124 [inline]
  process_backlog+0x12e8/0x1410 net/core/dev.c:5955
  napi_poll net/core/dev.c:6392 [inline]
  net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460
  __do_softirq+0x4a1/0x83a kernel/softirq.c:293
  do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1093
  </IRQ>
  do_softirq kernel/softirq.c:338 [inline]
  __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:190
  local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
  rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline]
  __dev_queue_xmit+0x38e8/0x4200 net/core/dev.c:3900
  dev_queue_xmit+0x4b/0x60 net/core/dev.c:3906
  packet_snd net/packet/af_packet.c:2959 [inline]
  packet_sendmsg+0x82d7/0x92e0 net/packet/af_packet.c:2984
  sock_sendmsg_nosec net/socket.c:637 [inline]
  sock_sendmsg net/socket.c:657 [inline]
  ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311
  __sys_sendmsg net/socket.c:2356 [inline]
  __do_sys_sendmsg net/socket.c:2365 [inline]
  __se_sys_sendmsg+0x305/0x460 net/socket.c:2363
  __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363
  do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x45a639
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff1b9c14c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000000000050 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff1b9c156d4
R13: 00000000004c8acf R14: 00000000004df078 R15: 00000000ffffffff

Uninit was created at:
  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
  kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134
  kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:88
  slab_alloc_node mm/slub.c:2799 [inline]
  __kmalloc_node_track_caller+0xd7b/0x1390 mm/slub.c:4407
  __kmalloc_reserve net/core/skbuff.c:141 [inline]
  __alloc_skb+0x306/0xa10 net/core/skbuff.c:209
  alloc_skb include/linux/skbuff.h:1050 [inline]
  alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5662
  sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2244
  packet_alloc_skb net/packet/af_packet.c:2807 [inline]
  packet_snd net/packet/af_packet.c:2902 [inline]
  packet_sendmsg+0x6785/0x92e0 net/packet/af_packet.c:2984
  sock_sendmsg_nosec net/socket.c:637 [inline]
  sock_sendmsg net/socket.c:657 [inline]
  ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311
  __sys_sendmsg net/socket.c:2356 [inline]
  __do_sys_sendmsg net/socket.c:2365 [inline]
  __se_sys_sendmsg+0x305/0x460 net/socket.c:2363
  __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363
  do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
=====================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2019-12-03 10:40 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-18 19:05 KMSAN: uninit-value in can_receive syzbot
2019-11-18 20:25 ` Oliver Hartkopp
2019-11-18 20:29   ` Marc Kleine-Budde
2019-11-18 20:49     ` Oliver Hartkopp
2019-11-18 21:15       ` Marc Kleine-Budde
2019-11-19  7:35         ` Oliver Hartkopp
2019-11-19  9:00           ` Oleksij Rempel
2019-11-19 10:08           ` Dmitry Vyukov
2019-11-19 13:06             ` Alexander Potapenko
2019-11-19 16:53           ` Eric Dumazet
2019-11-19 20:24             ` Oliver Hartkopp
2019-11-19 21:09               ` Eric Dumazet
2019-11-20 20:10                 ` Oliver Hartkopp
2019-12-03 10:09                   ` Marc Kleine-Budde
2019-12-03 10:37                     ` Oliver Hartkopp
2019-12-03 10:40                       ` Marc Kleine-Budde
2019-11-26  9:00 ` syzbot

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