On Tue, Mar 13, 2018 at 1:44 PM, Xin Long <lucien.xin@xxxxxxxxx> wrote: > On Tue, Mar 13, 2018 at 3:34 PM, syzbot > <syzbot+e56a5d45f832ef33ad2f@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: >> Hello, >> >> syzbot hit the following crash on net-next commit >> fd372a7a9e5e9d8011a0222d10edd3523abcd3b1 (Thu Mar 8 19:43:48 2018 +0000) >> Merge tag 'mlx5-updates-2018-02-28-2' of >> git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux >> >> Unfortunately, I don't have any reproducer for this crash yet. >> Raw console output is attached. >> compiler: gcc (GCC) 7.1.1 20170620 >> .config is attached. >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+e56a5d45f832ef33ad2f@xxxxxxxxxxxxxxxxxxxxxxxxx >> 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. >> >> selinux_nlmsg_perm: 1 callbacks suppressed >> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 >> sclass=netlink_route_socket pig=12502 comm=syz-executor3 >> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 >> sclass=netlink_route_socket pig=12528 comm=syz-executor3 >> list_del corruption, 00000000fcc5fb27->next is LIST_POISON1 >> (00000000cb16e51d) >> ------------[ cut here ]------------ >> kernel BUG at lib/list_debug.c:47! >> invalid opcode: 0000 [#1] SMP KASAN >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Modules linked in: >> CPU: 0 PID: 12537 Comm: syz-executor2 Not tainted 4.16.0-rc4+ #258 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> RIP: 0010:__list_del_entry_valid+0xd3/0x150 lib/list_debug.c:45 >> RSP: 0018:ffff8801b6387778 EFLAGS: 00010286 >> RAX: 000000000000004e RBX: dead000000000200 RCX: 0000000000000000 >> RDX: 000000000000004e RSI: ffffc90002ed6000 RDI: ffffed0036c70ee3 >> RBP: ffff8801b6387790 R08: 1ffff10036c70e3b R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000000 R12: dead000000000100 >> R13: ffff8801d3164000 R14: ffff8801d8502220 R15: ffff8801b6387c58 >> FS: 00007ff42042f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00007ff42040ddb8 CR3: 00000001bd840003 CR4: 00000000001606f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> Call Trace: >> __list_del_entry include/linux/list.h:117 [inline] >> list_del include/linux/list.h:125 [inline] >> sctp_association_free+0x133/0x930 net/sctp/associola.c:341 >> sctp_sendmsg+0xc67/0x1a80 net/sctp/socket.c:2075 >> inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 >> sock_sendmsg_nosec net/socket.c:629 [inline] >> sock_sendmsg+0xca/0x110 net/socket.c:639 >> SYSC_sendto+0x361/0x5c0 net/socket.c:1748 >> SyS_sendto+0x40/0x50 net/socket.c:1716 >> do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 >> entry_SYSCALL_64_after_hwframe+0x42/0xb7 >> RIP: 0033:0x453e69 >> RSP: 002b:00007ff42042ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c >> RAX: ffffffffffffffda RBX: 00007ff42042f6d4 RCX: 0000000000453e69 >> RDX: 0000000000000001 RSI: 0000000020000340 RDI: 0000000000000015 >> RBP: 000000000072c0c8 R08: 00000000204d9000 R09: 000000000000001c >> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff >> R13: 00000000000004cd R14: 00000000006f73d8 R15: 0000000000000003 >> Code: 8f 00 00 00 49 8b 54 24 08 48 39 f2 75 3b 48 83 c4 08 b8 01 00 00 00 >> 5b 41 5c 5d c3 4c 89 e2 48 c7 c7 c0 7c 40 86 e8 75 f6 fb fe <0f> 0b 48 c7 c7 >> 20 7d 40 86 e8 67 f6 fb fe 0f 0b 48 c7 c7 80 7d >> RIP: __list_del_entry_valid+0xd3/0x150 lib/list_debug.c:45 RSP: >> ffff8801b6387778 >> ---[ end trace a6b157f61f9bd43a ]--- >> Kernel panic - not syncing: Fatal exception >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Kernel Offset: disabled >> Rebooting in 86400 seconds.. >> >> >> --- >> This bug is generated by a dumb bot. It may contain errors. >> See https://goo.gl/tpsmEJ for details. >> Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. >> >> 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 >> 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. > I'd think the patch Neil just posted would fix it. Hi Xin, Could you point me to that commit? We need to tell syzbot about it. 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