device ifb0 entered promiscuous mode
sctp: [Deprecated]: syz-executor4 (pid 8770) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
mmap: syz-executor7 (8779) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.
==================================================================
BUG: KMSAN: uninit-value in memcmp+0x119/0x180 lib/string.c:861
CPU: 0 PID: 8772 Comm: syz-executor5 Not tainted 4.16.0+ #87
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:683
 memcmp+0x119/0x180 lib/string.c:861
 __hw_addr_del_ex net/core/dev_addr_lists.c:123 [inline]
 __dev_mc_del+0x169/0x6f0 net/core/dev_addr_lists.c:710
 dev_mc_del+0x6d/0x80 net/core/dev_addr_lists.c:728
 ip_mc_filter_del net/ipv4/igmp.c:1130 [inline]
 igmp_group_dropped+0x23a/0x12b0 net/ipv4/igmp.c:1263
 ip_mc_down+0x1d9/0x3e0 net/ipv4/igmp.c:1704
 inetdev_event+0x25d/0x1f20 net/ipv4/devinet.c:1510
 notifier_call_chain kernel/notifier.c:93 [inline]
 __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 raw_notifier_call_chain+0x13b/0x250 kernel/notifier.c:401
 call_netdevice_notifiers_info net/core/dev.c:1707 [inline]
 call_netdevice_notifiers net/core/dev.c:1725 [inline]
 dev_close_many+0x62a/0xa00 net/core/dev.c:1504
 rollback_registered_many+0x95d/0x1d60 net/core/dev.c:7383
 rollback_registered net/core/dev.c:7448 [inline]
 unregister_netdevice_queue+0x579/0xab0 net/core/dev.c:8462
 unregister_netdevice include/linux/netdevice.h:2473 [inline]
 __tun_detach+0x2483/0x2790 drivers/net/tun.c:736
 tun_detach drivers/net/tun.c:746 [inline]
 tun_chr_close+0x63/0xa0 drivers/net/tun.c:3168
 __fput+0x49e/0xa10 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x243/0x2c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:166 [inline]
 prepare_exit_to_usermode+0x33c/0x3a0 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xe9/0x700 arch/x86/entry/common.c:265
 do_syscall_64+0x36d/0x430 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455979
sctp: [Deprecated]: syz-executor4 (pid 8791) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
RSP: 002b:00007f30091c6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000124
RAX: 0000000000000014 RBX: 00007f30091c76d4 RCX: 0000000000455979
RDX: 0000000000080000 RSI: 0000000000000014 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000006e R14: 00000000006f4af0 R15: 0000000000000000

Local variable description: ----buf.i@igmp_group_dropped
Variable was created at:
 igmp_group_dropped+0x4d/0x12b0 net/ipv4/igmp.c:1254
random: crng init done