------------[ cut here ]------------ refcount_t: increment on 0; use-after-free. WARNING: CPU: 1 PID: 31856 at lib/refcount.c:153 refcount_inc_checked lib/refcount.c:153 [inline] WARNING: CPU: 1 PID: 31856 at lib/refcount.c:153 refcount_inc_checked+0x61/0x70 lib/refcount.c:151 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 31856 Comm: syz-executor.1 Not tainted 5.0.0-rc7+ #90 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+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x65c kernel/panic.c:214 __warn.cold+0x20/0x45 kernel/panic.c:571 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:refcount_inc_checked lib/refcount.c:153 [inline] RIP: 0010:refcount_inc_checked+0x61/0x70 lib/refcount.c:151 Code: 1d 2e e9 2e 06 31 ff 89 de e8 1b f0 45 fe 84 db 75 dd e8 d2 ee 45 fe 48 c7 c7 e0 25 a2 87 c6 05 0e e9 2e 06 01 e8 3d 3a 19 fe <0f> 0b eb c1 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 RSP: 0018:ffff88806ace7340 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000017c62 RSI: ffffffff815a92c6 RDI: ffffed100d59ce5a RBP: ffff88806ace7350 R08: ffff888094e3c240 R09: ffffed1015d23ef9 R10: ffffed1015d23ef8 R11: ffff8880ae91f7c7 R12: ffff888089d6a9cc R13: ffff888089d6a980 R14: 0000000000000000 R15: ffff888089d6a940 igmp_start_timer+0xac/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+0x18ed/0x29b0 net/ipv4/igmp.c:1073 ip_protocol_deliver_rcu+0x60/0x8e0 net/ipv4/ip_input.c:208 ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:234 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:255 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1db/0x2f0 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083 netif_receive_skb_internal+0x117/0x660 net/core/dev.c:5186 napi_frags_finish net/core/dev.c:5753 [inline] napi_gro_frags+0xade/0xd10 net/core/dev.c:5827 tun_get_user+0x2c0e/0x3dd0 drivers/net/tun.c:1974 tun_chr_write_iter+0xbd/0x160 drivers/net/tun.c:2019 call_write_iter include/linux/fs.h:1863 [inline] do_iter_readv_writev+0x5e0/0x8e0 fs/read_write.c:680 do_iter_write fs/read_write.c:956 [inline] do_iter_write+0x184/0x610 fs/read_write.c:937 kobject: 'loop5' (00000000fe22fecb): kobject_uevent_env vfs_writev+0x1b3/0x2f0 fs/read_write.c:1001 kobject: 'loop5' (00000000fe22fecb): fill_kobj_path: path = '/devices/virtual/block/loop5' do_writev+0xf6/0x290 fs/read_write.c:1036 __do_sys_writev fs/read_write.c:1109 [inline] __se_sys_writev fs/read_write.c:1106 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1106 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe kobject: 'loop2' (00000000090303e2): kobject_uevent_env RIP: 0033:0x457ce1 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 b9 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:00007ff1149d3ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000002a RCX: 0000000000457ce1 RDX: 0000000000000001 RSI: 00007ff1149d3bf0 RDI: 00000000000000f0 RBP: 0000000020000240 R08: 00000000000000f0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007ff1149d46d4 R13: 00000000004c64e1 R14: 00000000004db9c0 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..