Messages in this thread | | | Date | Tue, 19 Mar 2019 02:22:05 -0700 | Subject | general protection fault in ip6_dst_hoplimit | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: d9862cfb Merge tag 'mips_5.1' of git://git.kernel.org/pub/.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=12747c93200000 kernel config: https://syzkaller.appspot.com/x/.config?x=73d88a42238825ad dashboard link: https://syzkaller.appspot.com/bug?extid=4c869fc20129562c53fa compiler: gcc (GCC) 9.0.0 20181231 (experimental)
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+4c869fc20129562c53fa@syzkaller.appspotmail.com
dst_release: dst:00000000f3b89511 refcnt:-2120685656 dst_release: dst:00000000f3b89511 refcnt:-2120685656 IPVS: set_ctl: invalid protocol: 46 0.0.4.1:20003 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14303 Comm: syz-executor.2 Not tainted 5.0.0+ #97 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ip6_dst_hoplimit+0x26/0x3f0 net/ipv6/output_core.c:127 Code: 00 00 00 00 55 48 89 e5 41 55 41 54 53 48 89 fb e8 0f 2e 4b fb 48 8d 7b 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7d 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b RSP: 0018:ffff888029bb77c8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000004a58 RCX: ffffc9000a21d000 RDX: 000000000000094d RSI: ffffffff86248861 RDI: 0000000000004a68 RBP: ffff888029bb77e0 R08: ffff888096e1e400 R09: ffffed1015d25021 R10: ffffed1015d25bcf R11: ffff8880ae928107 R12: ffff888064f31880 R13: 0000000000004a58 R14: 0000000000000000 R15: ffff888029bb7e20 FS: 00007f66dbd52700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5833499000 CR3: 000000009ae87000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip6_sk_dst_hoplimit include/net/ipv6.h:765 [inline] udpv6_sendmsg+0x23af/0x28d0 net/ipv6/udp.c:1459 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:632 ___sys_sendmsg+0x806/0x930 net/socket.c:2137 __sys_sendmsg+0x105/0x1d0 net/socket.c:2175 __do_sys_sendmsg net/socket.c:2184 [inline] __se_sys_sendmsg net/socket.c:2182 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2182 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 kobject: 'loop5' (000000000bae834e): kobject_uevent_env entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458079 Code: ad b8 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f66dbd51c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e kobject: 'loop5' (000000000bae834e): fill_kobj_path: path = '/devices/virtual/block/loop5' RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458079 RDX: 0000000000000000 RSI: 0000000020002b80 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f66dbd526d4 R13: 00000000004c5601 R14: 00000000004d94a8 R15: 00000000ffffffff Modules linked in: kobject: 'loop4' (0000000057f28e01): kobject_uevent_env ---[ end trace ad1e9a18c63dc6fd ]--- kobject: 'ip6gre0' (00000000482f98f6): kobject_cleanup, parent (null) RIP: 0010:ip6_dst_hoplimit+0x26/0x3f0 net/ipv6/output_core.c:127 kobject: 'loop4' (0000000057f28e01): fill_kobj_path: path = '/devices/virtual/block/loop4' Code: 00 00 00 00 55 48 89 e5 41 55 41 54 53 48 89 fb e8 0f 2e 4b fb 48 8d 7b 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7d 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b kobject: 'ip6gre0' (00000000482f98f6): auto cleanup 'remove' event RSP: 0018:ffff888029bb77c8 EFLAGS: 00010206 kobject: 'loop3' (000000006d432d43): kobject_uevent_env RAX: dffffc0000000000 RBX: 0000000000004a58 RCX: ffffc9000a21d000 kobject: 'ip6gre0' (00000000482f98f6): kobject_uevent_env RDX: 000000000000094d RSI: ffffffff86248861 RDI: 0000000000004a68 kobject: 'loop3' (000000006d432d43): fill_kobj_path: path = '/devices/virtual/block/loop3' RBP: ffff888029bb77e0 R08: ffff888096e1e400 R09: ffffed1015d25021 kobject: 'ip6gre0' (00000000482f98f6): kobject_uevent_env: uevent_suppress caused the event to drop! R10: ffffed1015d25bcf R11: ffff8880ae928107 R12: ffff888064f31880 kobject: 'ip6gre0' (00000000482f98f6): calling ktype release R13: 0000000000004a58 R14: 0000000000000000 R15: ffff888029bb7e20 kobject: 'ip6gre0': free name FS: 00007f66dbd52700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 000000009ae87000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'rx-0' (00000000e6299323): kobject_cleanup, parent 000000006ae1d517 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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