[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.16' (ECDSA) to the list of known hosts. 2020/05/26 02:42:54 fuzzer started 2020/05/26 02:42:54 dialing manager at 10.128.0.105:44363 2020/05/26 02:43:05 syscalls: 3055 2020/05/26 02:43:05 code coverage: enabled 2020/05/26 02:43:05 comparison tracing: enabled 2020/05/26 02:43:05 extra coverage: enabled 2020/05/26 02:43:05 setuid sandbox: enabled 2020/05/26 02:43:05 namespace sandbox: enabled 2020/05/26 02:43:05 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/26 02:43:05 fault injection: enabled 2020/05/26 02:43:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/26 02:43:05 net packet injection: enabled 2020/05/26 02:43:05 net device setup: enabled 2020/05/26 02:43:05 concurrency sanitizer: enabled 2020/05/26 02:43:05 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/26 02:43:05 USB emulation: enabled syzkaller login: [ 62.536994][ T8919] KCSAN: could not find function: 'cleanup_glue_dir' [ 65.447872][ T8919] KCSAN: could not find function: '_find_next_bit' 2020/05/26 02:43:09 adding functions to KCSAN blacklist: 'run_timer_softirq' 'tick_nohz_idle_stop_tick' 'cleanup_glue_dir' '__mark_inode_dirty' 'find_get_pages_range_tag' 'vm_area_dup' 'mod_timer' 'get_cpu_idle_time_us' 'ktime_get_real_seconds' 'hrtimer_interrupt' 'ep_poll' 'dd_has_work' 'copy_process' 'pcpu_alloc' '__ext4_new_inode' 'blk_mq_get_request' 'generic_fillattr' 'shmem_getpage_gfp' 'do_nanosleep' 'snd_rawmidi_kernel_write1' 'do_signal_stop' 'blk_mq_sched_dispatch_requests' 'atime_needs_update' 'futex_wait_queue_me' '_find_next_bit' 'blk_mq_dispatch_rq_list' 'xas_clear_mark' 'generic_write_end' 'page_counter_charge' [ 85.928384][ C0] ================================================================== [ 85.936618][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 85.944662][ C0] [ 85.946968][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 85.954572][ C0] tick_sched_do_timer+0xb4/0xd0 [ 85.959507][ C0] tick_sched_timer+0x3f/0xd0 [ 85.964165][ C0] __hrtimer_run_queues+0x271/0x600 [ 85.969338][ C0] hrtimer_interrupt+0x226/0x490 [ 85.974250][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 85.979681][ C0] apic_timer_interrupt+0xf/0x20 [ 85.984599][ C0] kcsan_setup_watchpoint+0x25a/0x440 [ 85.989944][ C0] __pv_queued_spin_lock_slowpath+0x1f4/0x5c0 [ 85.995995][ C0] _raw_spin_lock_bh+0x5b/0x70 [ 86.000821][ C0] lock_sock_nested+0x2e/0xa0 [ 86.005477][ C0] tcp_recvmsg+0xa8/0x1ba0 [ 86.009869][ C0] inet_recvmsg+0xc1/0x250 [ 86.014260][ C0] sock_recvmsg+0x8e/0xb0 [ 86.018598][ C0] sock_read_iter+0x185/0x230 [ 86.023262][ C0] new_sync_read+0x416/0x450 [ 86.027841][ C0] __vfs_read+0x9e/0xb0 [ 86.032074][ C0] vfs_read+0x13e/0x2b0 [ 86.036212][ C0] ksys_read+0x16a/0x1a0 [ 86.040427][ C0] __x64_sys_read+0x49/0x60 [ 86.044905][ C0] do_syscall_64+0xc7/0x3b0 [ 86.049383][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 86.055240][ C0] [ 86.057638][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 86.065292][ C0] tick_sched_do_timer+0x2e/0xd0 [ 86.070207][ C0] tick_sched_timer+0x3f/0xd0 [ 86.074869][ C0] __hrtimer_run_queues+0x271/0x600 [ 86.080047][ C0] hrtimer_interrupt+0x226/0x490 [ 86.084974][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 86.090414][ C0] apic_timer_interrupt+0xf/0x20 [ 86.095421][ C0] __pv_queued_spin_lock_slowpath+0x390/0x5c0 [ 86.101475][ C0] _raw_spin_lock+0x5b/0x70 [ 86.105951][ C0] tcp_v4_rcv+0x1ae2/0x1e10 [ 86.110442][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 86.115787][ C0] ip_local_deliver_finish+0xf3/0x120 [ 86.121131][ C0] ip_local_deliver+0x135/0x220 [ 86.126043][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 86.131221][ C0] ip_sublist_rcv+0x3f8/0x530 [ 86.135873][ C0] ip_list_rcv+0x2f3/0x321 [ 86.140263][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 86.146216][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 86.152341][ C0] gro_normal_list.part.0+0x37/0xa0 [ 86.157511][ C0] gro_normal_one+0x14c/0x160 [ 86.162170][ C0] napi_gro_receive+0x27d/0x2f0 [ 86.167267][ C0] receive_buf+0x24c/0x3420 [ 86.171743][ C0] virtnet_poll+0x343/0x790 [ 86.176826][ C0] net_rx_action+0x3ad/0xac0 [ 86.181404][ C0] __do_softirq+0x118/0x34a [ 86.185920][ C0] run_ksoftirqd+0x41/0x60 [ 86.190322][ C0] smpboot_thread_fn+0x374/0x4a0 [ 86.195512][ C0] kthread+0x203/0x230 [ 86.199559][ C0] ret_from_fork+0x1f/0x30 [ 86.203945][ C0] [ 86.206243][ C0] Reported by Kernel Concurrency Sanitizer on: [ 86.212381][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 86.220422][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.230482][ C0] ================================================================== [ 86.238533][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 86.245198][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 86.253235][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.263262][ C0] Call Trace: [ 86.266522][ C0] [ 86.269366][ C0] dump_stack+0x11d/0x187 [ 86.273682][ C0] panic+0x210/0x640 [ 86.277567][ C0] ? vprintk_func+0x89/0x13a [ 86.282150][ C0] kcsan_report.cold+0xc/0x1a [ 86.286806][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 86.292167][ C0] tick_sched_do_timer+0x2e/0xd0 [ 86.297080][ C0] tick_sched_timer+0x3f/0xd0 [ 86.301732][ C0] __hrtimer_run_queues+0x271/0x600 [ 86.306906][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 86.311995][ C0] hrtimer_interrupt+0x226/0x490 [ 86.316912][ C0] ? kvm_clock_read+0x14/0x30 [ 86.321573][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 86.327009][ C0] apic_timer_interrupt+0xf/0x20 [ 86.331915][ C0] [ 86.334857][ C0] RIP: 0010:__pv_queued_spin_lock_slowpath+0x390/0x5c0 [ 86.341703][ C0] Code: 45 84 ff 75 23 ba 01 00 00 00 48 89 ee 4c 89 f7 e8 f5 f5 ff ff 48 89 ef e8 ad c5 1d 00 80 7c 24 20 00 0f 85 aa 00 00 00 f3 90 <41> 83 ef 01 0f 84 9e 00 00 00 ba 04 00 00 00 48 89 ee 4c 89 ef e8 [ 86.361302][ C0] RSP: 0018:ffffc90000cb3608 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 86.369693][ C0] RAX: ffff88812c0295a0 RBX: ffff88812c02d640 RCX: 0000000000000000 [ 86.377646][ C0] RDX: 0000000000000079 RSI: ffffc90000cb3628 RDI: ffffc90000cb3628 [ 86.385622][ C0] RBP: ffffc90000cb3628 R08: 0000000000000000 R09: 0000c90000cb3628 [ 86.393674][ C0] R10: 0000c90000cb3628 R11: 0000c90000cb362b R12: ffff888121efb3c8 [ 86.401631][ C0] R13: ffff88812c02d648 R14: ffff88812c12d654 R15: 0000000000007f12 [ 86.409612][ C0] ? __pv_queued_spin_lock_slowpath+0x3b2/0x5c0 [ 86.415844][ C0] ? tcp_v4_inbound_md5_hash+0x19a/0x250 [ 86.421466][ C0] _raw_spin_lock+0x5b/0x70 [ 86.426041][ C0] tcp_v4_rcv+0x1ae2/0x1e10 [ 86.430536][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 86.435884][ C0] ip_local_deliver_finish+0xf3/0x120 [ 86.441234][ C0] ip_local_deliver+0x135/0x220 [ 86.446061][ C0] ? ip_protocol_deliver_rcu+0x410/0x410 [ 86.451775][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 86.456948][ C0] ip_sublist_rcv+0x3f8/0x530 [ 86.461640][ C0] ? ip_sublist_rcv+0x530/0x530 [ 86.466508][ C0] ip_list_rcv+0x2f3/0x321 [ 86.470919][ C0] ? ip_rcv+0x1b0/0x1b0 [ 86.475066][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 86.481033][ C0] ? ktime_get_with_offset+0x1e6/0x230 [ 86.486493][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 86.492649][ C0] gro_normal_list.part.0+0x37/0xa0 [ 86.497836][ C0] ? __write_once_size+0x7c/0x100 [ 86.502835][ C0] gro_normal_one+0x14c/0x160 [ 86.507506][ C0] napi_gro_receive+0x27d/0x2f0 [ 86.512349][ C0] receive_buf+0x24c/0x3420 [ 86.516833][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0 [ 86.522278][ C0] virtnet_poll+0x343/0x790 [ 86.526934][ C0] net_rx_action+0x3ad/0xac0 [ 86.531514][ C0] __do_softirq+0x118/0x34a [ 86.536006][ C0] ? takeover_tasklets+0x240/0x240 [ 86.541089][ C0] run_ksoftirqd+0x41/0x60 [ 86.545566][ C0] smpboot_thread_fn+0x374/0x4a0 [ 86.550486][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 86.556539][ C0] kthread+0x203/0x230 [ 86.560591][ C0] ? kthread_unpark+0xd0/0xd0 [ 86.565415][ C0] ret_from_fork+0x1f/0x30 [ 86.571331][ C0] Kernel Offset: disabled [ 86.576616][ C0] Rebooting in 86400 seconds..