[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 61.678669][ T27] audit: type=1800 audit(1576225627.980:25): pid=8804 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 61.698350][ T27] audit: type=1800 audit(1576225627.980:26): pid=8804 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 61.749417][ T27] audit: type=1800 audit(1576225627.980:27): pid=8804 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.84' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 75.510533][ T8963] netlink: 2 bytes leftover after parsing attributes in process `syz-executor795'.
[ 75.557776][ C0] ==================================================================
[ 75.566038][ C0] BUG: KASAN: use-after-free in __alloc_skb+0x37b/0x5e0
[ 75.572976][ C0] Write of size 32 at addr ffff88819e655dc0 by task udevd/8967
[ 75.580512][ C0]
[ 75.582848][ C0] CPU: 0 PID: 8967 Comm: udevd Not tainted 5.5.0-rc1-syzkaller #0
[ 75.590645][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 75.600698][ C0] Call Trace:
[ 75.604033][ C0]
[ 75.606896][ C0] dump_stack+0x197/0x210
[ 75.611231][ C0] ? __alloc_skb+0x37b/0x5e0
[ 75.615829][ C0] print_address_description.constprop.0.cold+0xd4/0x30b
[ 75.622854][ C0] ? __alloc_skb+0x37b/0x5e0
[ 75.627448][ C0] ? __alloc_skb+0x37b/0x5e0
[ 75.632038][ C0] __kasan_report.cold+0x1b/0x41
[ 75.636981][ C0] ? __alloc_skb+0x37b/0x5e0
[ 75.641577][ C0] kasan_report+0x12/0x20
[ 75.645915][ C0] check_memory_region+0x134/0x1a0
[ 75.651029][ C0] memset+0x24/0x40
[ 75.654842][ C0] __alloc_skb+0x37b/0x5e0
[ 75.659271][ C0] ? __kmalloc_reserve.isra.0+0xf0/0xf0
[ 75.664827][ C0] ? print_circular_bug.isra.0+0x230/0x230
[ 75.670650][ C0] igmpv3_newpack+0x1b9/0x1110
[ 75.675427][ C0] ? ip_mc_join_group+0x30/0x30
[ 75.680300][ C0] ? __kasan_check_read+0x11/0x20
[ 75.685341][ C0] ? __lock_acquire+0x16f2/0x4a00
[ 75.690391][ C0] add_grhead.isra.0+0x235/0x300
[ 75.695342][ C0] add_grec+0x842/0x1230
[ 75.699600][ C0] ? do_raw_spin_lock+0x12a/0x2e0
[ 75.704643][ C0] ? rwlock_bug.part.0+0x90/0x90
[ 75.709675][ C0] ? add_grhead.isra.0+0x300/0x300
[ 75.714807][ C0] igmp_ifc_timer_expire+0x4af/0xab0
[ 75.720106][ C0] call_timer_fn+0x1ac/0x780
[ 75.724703][ C0] ? __ip_mc_dec_group+0x520/0x520
[ 75.729829][ C0] ? msleep_interruptible+0x150/0x150
[ 75.735207][ C0] ? run_timer_softirq+0x6b1/0x1790
[ 75.740595][ C0] ? trace_hardirqs_on+0x67/0x240
[ 75.745627][ C0] ? __ip_mc_dec_group+0x520/0x520
[ 75.750754][ C0] ? __ip_mc_dec_group+0x520/0x520
[ 75.755878][ C0] run_timer_softirq+0x6c3/0x1790
[ 75.760917][ C0] ? add_timer+0x930/0x930
[ 75.765337][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130
[ 75.771504][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 75.777064][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 75.783056][ C0] ? trace_hardirqs_on+0x67/0x240
[ 75.788092][ C0] __do_softirq+0x262/0x98c
[ 75.792603][ C0] ? sched_clock_cpu+0x1b/0x1b0
[ 75.797464][ C0] irq_exit+0x19b/0x1e0
[ 75.801625][ C0] smp_apic_timer_interrupt+0x1a3/0x610
[ 75.807181][ C0] apic_timer_interrupt+0xf/0x20
[ 75.812112][ C0]
[ 75.815057][ C0] RIP: 0010:__sanitizer_cov_trace_switch+0x73/0x80
[ 75.821557][ C0] Code: 49 39 dd 75 e9 5b 41 5c 41 5d 5d c3 48 83 f8 40 bf 07 00 00 00 74 cc 5b 41 5c 41 5d 5d c3 bf 01 00 00 00 eb be bf 05 00 00 00 b7 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 55 49 c7 c5
[ 75.841167][ C0] RSP: 0018:ffffc90001de7dd0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[ 75.849588][ C0] RAX: 0000000000000020 RBX: 0000000000000fe0 RCX: ffffffff81bb9fc6
[ 75.857566][ C0] RDX: 0000000000000000 RSI: ffffffff88361d00 RDI: 0000000000000005
[ 75.865552][ C0] RBP: ffffc90001de7de8 R08: ffff888096014080 R09: 0000000000000000
[ 75.873538][ C0] R10: ffffed1012c98faf R11: ffff8880964c7d7f R12: ffffffff88361d00
[ 75.881518][ C0] R13: 0000000000000000 R14: ffff8880964c7d80 R15: 0000000053f9f150
[ 75.889524][ C0] ? __check_object_size+0x86/0x437
[ 75.894755][ C0] __check_object_size+0xb2/0x437
[ 75.899793][ C0] strncpy_from_user+0xa8/0x400
[ 75.904655][ C0] getname_flags+0x11b/0x5b0
[ 75.909249][ C0] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 75.915329][ C0] getname+0x1a/0x20
[ 75.919253][ C0] __x64_sys_execve+0x73/0xc0
[ 75.923939][ C0] do_syscall_64+0xfa/0x790
[ 75.928453][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 75.934345][ C0] RIP: 0033:0x7fa81aad8207
[ 75.938764][ C0] Code: 77 19 f4 48 89 d7 44 89 c0 0f 05 48 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 f7 d8 64 41 89 01 eb df b8 3b 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 f3 c3 48 8b 15 00 8c 2d 00 f7 d8 64 89 02
[ 75.958368][ C0] RSP: 002b:00007fffac05e9a8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
[ 75.966787][ C0] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fa81aad8207
[ 75.974768][ C0] RDX: 00000000008fbe80 RSI: 00007fffac05eaa0 RDI: 00007fffac05feb0
[ 75.982745][ C0] RBP: 0000000000625500 R08: 00000000000022f4 R09: 00000000000022f4
[ 75.990725][ C0] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000008fbe80
[ 75.998700][ C0] R13: 00000000ffffffff R14: 00000000008e3250 R15: 0000000000000005
[ 76.006686][ C0]
[ 76.00901