[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] 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.
[ 29.553077] kauditd_printk_skb: 7 callbacks suppressed
[ 29.553088] audit: type=1800 audit(1545006591.959:29): pid=5889 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0
[ 29.587851] audit: type=1800 audit(1545006591.959:30): pid=5889 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.75' (ECDSA) to the list of known hosts.
syzkaller login: [ 36.976579] IPVS: ftp: loaded support on port[0] = 21
net.ipv6.conf.syz_tun.accept_dad = 0
net.ipv6.conf.syz_tun.router_solicitations = 0
[ 37.230722] bridge0: port 1(bridge_slave_0) entered blocking state
[ 37.237753] bridge0: port 1(bridge_slave_0) entered disabled state
[ 37.245529] device bridge_slave_0 entered promiscuous mode
[ 37.264071] bridge0: port 2(bridge_slave_1) entered blocking state
[ 37.270498] bridge0: port 2(bridge_slave_1) entered disabled state
[ 37.277710] device bridge_slave_1 entered promiscuous mode
[ 37.297797] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[ 37.315704] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[ 37.365857] bond0: Enslaving bond_slave_0 as an active interface with an up link
[ 37.385883] bond0: Enslaving bond_slave_1 as an active interface with an up link
[ 37.463543] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready
[ 37.470892] team0: Port device team_slave_0 added
[ 37.488136] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready
[ 37.495392] team0: Port device team_slave_1 added
[ 37.512760] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 37.532805] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 37.553291] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[ 37.573408] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
RTNETLINK answers: Operation not supported
RTNETLINK answers: No buffer space available
RTNETLINK answers: Operation not supported
[ 37.720680] bridge0: port 2(bridge_slave_1) entered blocking state
[ 37.727158] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 37.734187] bridge0: port 1(bridge_slave_0) entered blocking state
[ 37.740526] bridge0: port 1(bridge_slave_0) entered forwarding state
RTNETLINK answers: Operation not supported
RTNETLINK answers: Operation not supported
RTNETLINK answers: Operation not supported
RTNETLINK answers: Invalid argument
RTNETLINK answers: Invalid argument
RTNETLINK answers: Invalid argument
[ 38.277934] 8021q: adding VLAN 0 to HW filter on device bond0
[ 38.329766] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[ 38.381584] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[ 38.387769] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[ 38.395749] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 38.449978] 8021q: adding VLAN 0 to HW filter on device team0
executing program
[ 38.742446] ==================================================================
[ 38.749900] BUG: KASAN: use-after-free in tick_sched_handle+0x16c/0x180
[ 38.756636] Read of size 8 at addr ffff8881d2a27c60 by task syz-executor238/6044
[ 38.764146]
[ 38.765764] CPU: 1 PID: 6044 Comm: syz-executor238 Not tainted 4.20.0-rc6+ #348
[ 38.773191] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 38.782528] Call Trace:
[ 38.785110]
[ 38.787255] dump_stack+0x244/0x39d
[ 38.790868] ? dump_stack_print_info.cold.1+0x20/0x20
[ 38.796058] ? printk+0xa7/0xcf
[ 38.799339] ? kmsg_dump_rewind_nolock+0xe4/0xe4
[ 38.804085] print_address_description.cold.7+0x9/0x1ff
[ 38.809435] kasan_report.cold.8+0x242/0x309
[ 38.813831] ? tick_sched_handle+0x16c/0x180
[ 38.818231] __asan_report_load8_noabort+0x14/0x20
[ 38.823146] tick_sched_handle+0x16c/0x180
[ 38.827369] tick_sched_timer+0x45/0x130
[ 38.831431] __hrtimer_run_queues+0x41c/0x10d0
[ 38.836039] ? tick_sched_do_timer+0x1a0/0x1a0
[ 38.840612] ? hrtimer_start_range_ns+0xe00/0xe00
[ 38.845444] ? pvclock_read_flags+0x160/0x160
[ 38.849925] ? trace_hardirqs_on+0x310/0x310
[ 38.854321] ? kvm_clock_read+0x18/0x30
[ 38.858283] ? __sanitizer_cov_trace_cmp4+0x16/0x20
[ 38.863285] ? ktime_get_update_offsets_now+0x3b3/0x540
[ 38.868638] ? do_timer+0x50/0x50
[ 38.872076] ? rwlock_bug.part.2+0x90/0x90
[ 38.876296] ? trace_hardirqs_on+0x310/0x310
[ 38.880691] ? rcu_softirq_qs+0x20/0x20
[ 38.884673] hrtimer_interrupt+0x313/0x780
[ 38.888906] smp_apic_timer_interrupt+0x1a1/0x760
[ 38.893732] ? smp_reschedule_interrupt+0x109/0x650
[ 38.898735] ? smp_call_function_single_interrupt+0x650/0x650
[ 38.904606] ? interrupt_entry+0xb5/0xc0
[ 38.908653] ? trace_hardirqs_off_caller+0xbb/0x310
[ 38.913672] ? trace_hardirqs_off_caller+0xbb/0x310
[ 38.918682] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 38.923512] ? trace_hardirqs_on_caller+0x310/0x310
[ 38.928510] ? trace_hardirqs_on_caller+0x310/0x310
[ 38.933513] ? task_prio+0x50/0x50
[ 38.937044] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 38.942568] ? check_preemption_disabled+0x48/0x280
[ 38.947591] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 38.952433] apic_timer_interrupt+0xf/0x20
[ 38.956650]
[ 38.958867]
[ 38.960473] The buggy address belongs to the page:
[ 38.965386] page:ffffea00074a89c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
[ 38.973509] flags: 0x2fffc0000000000()
[ 38.977385] raw: 02fffc0000000000 0000000000000000 ffffffff074a0101 0000000000000000
[ 38.985249] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 38.993107] page dumped because: kasan: bad access detected
[ 38.998797]
[ 39.000402] Memory state around the buggy address:
[ 39.005313] ffff8881d2a27b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 39.012658] ffff8881d2a27b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 39.019999] >ffff8881d2a27c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 39.027343] ^
[ 39.033818] ffff8881d2a27c80: ff ff ff ff ff ff ff ff ff ff ff ff ff f1 f1 f1
[ 39.041180] ffff8881d2a27d00: f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2
[ 39.048533] ==================================================================
[ 39.055874] Disabling lock debugging due to kernel taint
[ 39.061317] Kernel panic - not syncing: panic_on_warn set ...
[ 39.067191] CPU: 1 PID: 6044 Comm: syz-executor238 Tainted: G B 4.20.0-rc6+ #348
[ 39.076356] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 39.085708] Call Trace:
[ 39.088276]
[ 39.090418] dump_stack+0x244/0x39d
[ 39.094029] ? dump_stack_print_info.cold.1+0x20/0x20
[ 39.099221] panic+0x2ad/0x55c
[ 39.102404] ? add_taint.cold.5+0x16/0x16
[ 39.106543] ? add_taint.cold.5+0x5/0x16
[ 39.110599] ? trace_hardirqs_off+0xaf/0x310
[ 39.114994] kasan_end_report+0x47/0x4f
[ 39.118954] kasan_report.cold.8+0x76/0x309
[ 39.123282] ? tick_sched_handle+0x16c/0x180
[ 39.127679] __asan_report_load8_noabort+0x14/0x20
[ 39.132599] tick_sched_handle+0x16c/0x180
[ 39.136833] tick_sched_timer+0x45/0x130
[ 39.140895] __hrtimer_run_queues+0x41c/0x10d0
[ 39.145465] ? tick_sched_do_timer+0x1a0/0x1a0
[ 39.150031] ? hrtimer_start_range_ns+0xe00/0xe00
[ 39.154863] ? pvclock_read_flags+0x160/0x160
[ 39.159344] ? trace_hardirqs_on+0x310/0x310
[ 39.163740] ? kvm_clock_read+0x18/0x30
[ 39.167697] ? __sanitizer_cov_trace_cmp4+0x16/0x20
[ 39.172713] ? ktime_get_update_offsets_now+0x3b3/0x540
[ 39.178084] ? do_timer+0x50/0x50
[ 39.181521] ? rwlock_bug.part.2+0x90/0x90
[ 39.185741] ? trace_hardirqs_on+0x310/0x310
[ 39.190131] ? rcu_softirq_qs+0x20/0x20
[ 39.194091] hrtimer_interrupt+0x313/0x780
[ 39.198330] smp_apic_timer_interrupt+0x1a1/0x760
[ 39.203203] ? smp_reschedule_interrupt+0x109/0x650
[ 39.208203] ? smp_call_function_single_interrupt+0x650/0x650
[ 39.214072] ? interrupt_entry+0xb5/0xc0
[ 39.218119] ? trace_hardirqs_off_caller+0xbb/0x310
[ 39.223120] ? trace_hardirqs_off_caller+0xbb/0x310
[ 39.228119] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 39.232944] ? trace_hardirqs_on_caller+0x310/0x310
[ 39.237941] ? trace_hardirqs_on_caller+0x310/0x310
[ 39.242939] ? task_prio+0x50/0x50
[ 39.246480] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 39.252000] ? check_preemption_disabled+0x48/0x280
[ 39.257002] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 39.261849] apic_timer_interrupt+0xf/0x20
[ 39.266061]
[ 39.269364] Kernel Offset: disabled
[ 39.272990] Rebooting in 86400 seconds..