[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. 2020/05/24 00:16:55 fuzzer started 2020/05/24 00:16:56 dialing manager at 10.128.0.105:46225 2020/05/24 00:17:06 syscalls: 3055 2020/05/24 00:17:06 code coverage: enabled 2020/05/24 00:17:06 comparison tracing: enabled 2020/05/24 00:17:06 extra coverage: enabled 2020/05/24 00:17:06 setuid sandbox: enabled 2020/05/24 00:17:06 namespace sandbox: enabled 2020/05/24 00:17:06 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/24 00:17:06 fault injection: enabled 2020/05/24 00:17:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/24 00:17:06 net packet injection: enabled 2020/05/24 00:17:06 net device setup: enabled 2020/05/24 00:17:06 concurrency sanitizer: enabled 2020/05/24 00:17:06 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/24 00:17:06 USB emulation: enabled syzkaller login: [ 63.553376][ T8922] KCSAN: could not find function: '_find_next_bit' 2020/05/24 00:17:09 adding functions to KCSAN blacklist: '__ext4_new_inode' 'tick_nohz_idle_stop_tick' 'blk_mq_get_request' '__snd_rawmidi_transmit_ack' 'blk_mq_sched_dispatch_requests' 'copy_process' 'mod_timer' 'ext4_free_inodes_count' '_find_next_bit' 'do_exit' 'echo_char' '__mark_inode_dirty' 'generic_write_end' 'page_counter_charge' 'xas_clear_mark' 'pcpu_alloc' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' 'do_nanosleep' 'run_timer_softirq' 'ep_poll' 'ext4_mark_iloc_dirty' 'fsnotify' [ 103.393420][ C0] ================================================================== [ 103.401566][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 103.409694][ C0] [ 103.412019][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 103.419646][ C0] tick_sched_do_timer+0xb4/0xd0 [ 103.424585][ C0] tick_sched_timer+0x3f/0xd0 [ 103.429271][ C0] __hrtimer_run_queues+0x271/0x600 [ 103.434455][ C0] hrtimer_interrupt+0x226/0x490 [ 103.439512][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 103.444970][ C0] apic_timer_interrupt+0xf/0x20 [ 103.449894][ C0] __tsan_read1+0x2c/0x110 [ 103.454290][ C0] nf_conntrack_tcp_packet+0x4fa/0x2fe0 [ 103.459907][ C0] nf_conntrack_in+0x3fe/0xa60 [ 103.464645][ C0] ipv4_conntrack_in+0x23/0x40 [ 103.469387][ C0] nf_hook_slow+0x7c/0x160 [ 103.473919][ C0] nf_hook_slow_list+0x140/0x29f [ 103.478836][ C0] ip_sublist_rcv+0x4f9/0x530 [ 103.483490][ C0] ip_list_rcv+0x2f3/0x321 [ 103.487905][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 103.493873][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 103.500355][ C0] gro_normal_list.part.0+0x37/0xa0 [ 103.505541][ C0] gro_normal_one+0x14c/0x160 [ 103.510191][ C0] napi_gro_receive+0x27d/0x2f0 [ 103.515087][ C0] receive_buf+0x24c/0x3420 [ 103.519919][ C0] virtnet_poll+0x343/0x790 [ 103.528580][ C0] net_rx_action+0x3ad/0xac0 [ 103.533146][ C0] __do_softirq+0x118/0x34a [ 103.537627][ C0] run_ksoftirqd+0x41/0x60 [ 103.542124][ C0] smpboot_thread_fn+0x374/0x4a0 [ 103.547034][ C0] kthread+0x203/0x230 [ 103.551075][ C0] ret_from_fork+0x1f/0x30 [ 103.555457][ C0] [ 103.557761][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 103.565291][ C0] tick_sched_do_timer+0x2e/0xd0 [ 103.570216][ C0] tick_sched_timer+0x3f/0xd0 [ 103.574880][ C0] __hrtimer_run_queues+0x271/0x600 [ 103.580069][ C0] hrtimer_interrupt+0x226/0x490 [ 103.585020][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 103.590455][ C0] apic_timer_interrupt+0xf/0x20 [ 103.595361][ C0] [ 103.597661][ C0] Reported by Kernel Concurrency Sanitizer on: [ 103.603794][ C0] CPU: 0 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 103.612085][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 103.622111][ C0] ================================================================== [ 103.630154][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 103.636725][ C0] CPU: 0 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 103.644931][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 103.654970][ C0] Call Trace: [ 103.658231][ C0] [ 103.661064][ C0] dump_stack+0x11d/0x187 [ 103.665385][ C0] panic+0x210/0x640 [ 103.669347][ C0] ? vprintk_func+0x89/0x13a [ 103.673933][ C0] kcsan_report.cold+0xc/0x1a [ 103.678601][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 103.683963][ C0] tick_sched_do_timer+0x2e/0xd0 [ 103.688878][ C0] tick_sched_timer+0x3f/0xd0 [ 103.693538][ C0] __hrtimer_run_queues+0x271/0x600 [ 103.698710][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 103.703809][ C0] hrtimer_interrupt+0x226/0x490 [ 103.708732][ C0] ? kvm_clock_read+0x14/0x30 [ 103.713395][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 103.718853][ C0] apic_timer_interrupt+0xf/0x20 [ 103.723845][ C0] [ 103.726797][ C0] RIP: 0033:0x60a189 [ 103.730675][ C0] Code: 8b 6c 24 30 48 83 c4 38 c3 e8 d3 d1 e4 ff e9 0e ff ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff <48> 3b 61 10 0f 86 b4 01 00 00 48 83 ec 38 48 89 6c 24 30 48 8d 6c [ 103.750264][ C0] RSP: 002b:000000c4204e3a78 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 103.758688][ C0] RAX: 000000c420396028 RBX: 0000000000008000 RCX: 000000c420001980 [ 103.766633][ C0] RDX: 0000000000007531 RSI: 0000000000000acf RDI: 00000000000000c9 [ 103.774589][ C0] RBP: 000000c4204e3b18 R08: 000000c4204a2000 R09: 0000000000000004 [ 103.782534][ C0] R10: 00000000ffffffff R11: 00000000000065b3 R12: 0000000000000009 [ 103.790489][ C0] R13: 000000c4267a5740 R14: 0000000000000004 R15: ffffffffffffffff [ 103.800032][ C0] Kernel Offset: disabled [ 103.804972][ C0] Rebooting in 86400 seconds..