RSP = 0x0000000000000f80 RIP = 0x0000000000000045 RFLAGS=0x00000006 DR7 = 0x0000000000000400 ------------[ cut here ]------------ Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 refcount_t: increment on 0; use-after-free. WARNING: CPU: 1 PID: 11148 at lib/refcount.c:153 refcount_inc_checked+0x5d/0x70 lib/refcount.c:153 CS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11148 Comm: syz-executor0 Not tainted 4.19.0-next-20181101+ #103 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+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 DS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 __warn.cold.8+0x20/0x45 kernel/panic.c:540 SS: sel=0x0000, attr=0x04085, limit=0x00000000, base=0x0000000000000000 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 ES: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:refcount_inc_checked+0x5d/0x70 lib/refcount.c:153 Code: 1d a1 e8 7d 06 31 ff 89 de e8 6f b7 eb fd 84 db 75 df e8 96 b6 eb fd 48 c7 c7 20 e8 60 88 c6 05 81 e8 7d 06 01 e8 63 27 b5 fd <0f> 0b eb c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 FS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 RSP: 0018:ffff88017b256ce0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90002561000 RDX: 0000000000008a9d RSI: ffffffff8165bd45 RDI: 0000000000000005 RBP: ffff88017b256ce8 R08: ffff8801c65da440 R09: 0000000000000002 R10: 0000000000000000 R11: ffff8801c65da440 R12: 0000000000000000 R13: 000000010000c4bd R14: ffff8801cbec0dc0 R15: dffffc0000000000 igmp_start_timer+0xaf/0xe0 net/ipv4/igmp.c:214 igmp_mod_timer net/ipv4/igmp.c:252 [inline] igmp_heard_query net/ipv4/igmp.c:1038 [inline] igmp_rcv+0x1a62/0x3220 net/ipv4/igmp.c:1073 GS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 GDTR: limit=0x00000000, base=0x0000000000000000 ip_local_deliver_finish+0x2e9/0xda0 net/ipv4/ip_input.c:215 LDTR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x1e4/0x740 net/ipv4/ip_input.c:256 IDTR: limit=0x00000000, base=0x0000000000000000 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xe8/0x600 net/ipv4/ip_input.c:524 TR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4941 __netif_receive_skb+0x27/0x1e0 net/core/dev.c:5051 netif_receive_skb_internal+0x11d/0x7f0 net/core/dev.c:5154 EFER = 0x0000000000000000 PAT = 0x0007040600070406 napi_frags_finish net/core/dev.c:5690 [inline] napi_gro_frags+0x74a/0xc80 net/core/dev.c:5763 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 tun_get_user+0x3189/0x4250 drivers/net/tun.c:1948 Interruptibility = 00000000 ActivityState = 00000000 tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:1993 kobject: 'loop4' (00000000360141cd): kobject_uevent_env call_write_iter include/linux/fs.h:1864 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 kobject: 'loop4' (00000000360141cd): fill_kobj_path: path = '/devices/virtual/block/loop4' do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_writev+0x1f1/0x360 fs/read_write.c:1004 *** Host State *** do_writev+0x11a/0x310 fs/read_write.c:1039 RIP = 0xffffffff8120262c RSP = 0xffff880184bf7390 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev fs/read_write.c:1109 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457421 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 b5 fb ff c3 48 83 ec 08 e8 1a 2d 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 63 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fcccff44ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000002a RCX: 0000000000457421 RDX: 0000000000000001 RSI: 00007fcccff44bf0 RDI: 00000000000000f0 RBP: 0000000020000240 R08: 00000000000000f0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fcccff456d4 R13: 00000000004c4b01 R14: 00000000004d8098 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..