On Thu, Apr 12, 2018 at 10:01 AM, syzbot <syzbot+0bbe42c764feafa82...@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot hit the following crash on https://github.com/google/kmsan.git/master > commit > e2ab7e8abba47a2f2698216258e5d8727ae58717 (Fri Apr 6 16:24:31 2018 +0000) > kmsan: temporarily disable visitAsmInstruction() to help syzbot > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=0bbe42c764feafa82c5a > > So far this crash happened 30 times on > https://github.com/google/kmsan.git/master. > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=4850744041668608 > syzkaller reproducer: > https://syzkaller.appspot.com/x/repro.syz?id=6289386287136768 > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=4577411249209344 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=6627248707860932248 > compiler: clang version 7.0.0 (trunk 329391)
+Toshiaki as this seems to be related to the recent vlan tagging changes. This also seems to be related to https://groups.google.com/d/msg/syzkaller-bugs/FNEavkB4QaM/efXl2AeRBgAJ > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+0bbe42c764feafa82...@syzkaller.appspotmail.com > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > ================================================================== > BUG: KMSAN: uninit-value in eth_type_vlan include/linux/if_vlan.h:283 > [inline] > BUG: KMSAN: uninit-value in skb_vlan_tagged_multi > include/linux/if_vlan.h:656 [inline] > BUG: KMSAN: uninit-value in vlan_features_check include/linux/if_vlan.h:672 > [inline] > BUG: KMSAN: uninit-value in dflt_features_check net/core/dev.c:2949 [inline] > BUG: KMSAN: uninit-value in netif_skb_features+0xd1b/0xdc0 > net/core/dev.c:3009 > CPU: 1 PID: 3582 Comm: syzkaller435149 Not tainted 4.16.0+ #82 > 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:676 > eth_type_vlan include/linux/if_vlan.h:283 [inline] > skb_vlan_tagged_multi include/linux/if_vlan.h:656 [inline] > vlan_features_check include/linux/if_vlan.h:672 [inline] > dflt_features_check net/core/dev.c:2949 [inline] > netif_skb_features+0xd1b/0xdc0 net/core/dev.c:3009 > validate_xmit_skb+0x89/0x1320 net/core/dev.c:3084 > __dev_queue_xmit+0x1cb2/0x2b60 net/core/dev.c:3549 > dev_queue_xmit+0x4b/0x60 net/core/dev.c:3590 > packet_snd net/packet/af_packet.c:2944 [inline] > packet_sendmsg+0x7c57/0x8a10 net/packet/af_packet.c:2969 > 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+0x7bb/0x970 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: 0033:0x43ffa9 > RSP: 002b:00007fff2cff3948 EFLAGS: 00000217 ORIG_RAX: 0000000000000014 > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ffa9 > RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000003 > RBP: 00000000006cb018 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018d0 > R13: 0000000000401960 R14: 0000000000000000 R15: 0000000000000000 > > Uninit was created at: > kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline] > kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188 > kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314 > kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321 > slab_post_alloc_hook mm/slab.h:445 [inline] > slab_alloc_node mm/slub.c:2737 [inline] > __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369 > __kmalloc_reserve net/core/skbuff.c:138 [inline] > __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206 > alloc_skb include/linux/skbuff.h:984 [inline] > alloc_skb_with_frags+0x1d4/0xb20 net/core/skbuff.c:5234 > sock_alloc_send_pskb+0xb56/0x1190 net/core/sock.c:2085 > packet_alloc_skb net/packet/af_packet.c:2803 [inline] > packet_snd net/packet/af_packet.c:2894 [inline] > packet_sendmsg+0x6444/0x8a10 net/packet/af_packet.c:2969 > 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+0x7bb/0x970 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 > ================================================================== > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkal...@googlegroups.com. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/089e082d0cb81b67d10569a2283f%40google.com. > For more options, visit https://groups.google.com/d/optout.
