Starting Update UTMP about System Runlevel Changes... [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. 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 '10.128.1.11' (ECDSA) to the list of known hosts. 2020/06/06 13:43:22 fuzzer started 2020/06/06 13:43:22 dialing manager at 10.128.0.105:33593 2020/06/06 13:43:23 syscalls: 3055 2020/06/06 13:43:23 code coverage: enabled 2020/06/06 13:43:23 comparison tracing: enabled 2020/06/06 13:43:23 extra coverage: enabled 2020/06/06 13:43:23 setuid sandbox: enabled 2020/06/06 13:43:23 namespace sandbox: enabled 2020/06/06 13:43:23 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/06 13:43:23 fault injection: enabled 2020/06/06 13:43:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/06 13:43:23 net packet injection: enabled 2020/06/06 13:43:23 net device setup: enabled 2020/06/06 13:43:23 concurrency sanitizer: enabled 2020/06/06 13:43:23 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/06 13:43:23 USB emulation: enabled syzkaller login: [ 53.147662][ T8919] KCSAN: could not find function: '_find_next_bit' 2020/06/06 13:43:25 adding functions to KCSAN blacklist: 'tick_nohz_idle_stop_tick' 'blk_mq_sched_dispatch_requests' '__send_signal' 'do_syslog' 'ep_poll' 'blk_mq_dispatch_rq_list' 'run_timer_softirq' 'dd_has_work' 'do_nanosleep' '_find_next_bit' 'blk_mq_get_request' 'generic_write_end' 'ext4_free_inodes_count' 'pcpu_alloc' '__ext4_new_inode' 'find_get_pages_range_tag' 'alloc_pid' 'page_counter_charge' 'copy_process' 'af_alg_sendpage' [ 54.929170][ C0] ================================================================== [ 54.937485][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 54.946213][ C0] [ 54.948662][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 54.956283][ C0] tick_sched_do_timer+0xb4/0xd0 [ 54.961226][ C0] tick_sched_timer+0x3f/0xd0 [ 54.965898][ C0] __hrtimer_run_queues+0x271/0x600 [ 54.971069][ C0] hrtimer_interrupt+0x226/0x490 [ 54.975983][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 54.981414][ C0] apic_timer_interrupt+0xf/0x20 [ 54.986316][ C0] [ 54.988621][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 54.996158][ C0] tick_sched_do_timer+0x2e/0xd0 [ 55.001086][ C0] tick_sched_timer+0x3f/0xd0 [ 55.005752][ C0] __hrtimer_run_queues+0x271/0x600 [ 55.010935][ C0] hrtimer_interrupt+0x226/0x490 [ 55.015858][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 55.021297][ C0] apic_timer_interrupt+0xf/0x20 [ 55.026225][ C0] __nf_ct_refresh_acct+0x15d/0x1a0 [ 55.031423][ C0] nf_conntrack_tcp_packet+0xc63/0x2fe0 [ 55.037036][ C0] nf_conntrack_in+0x3fe/0xa60 [ 55.041773][ C0] ipv4_conntrack_in+0x23/0x40 [ 55.046511][ C0] nf_hook_slow+0x7c/0x160 [ 55.050912][ C0] nf_hook_slow_list+0x140/0x29f [ 55.055844][ C0] ip_sublist_rcv+0x4f9/0x530 [ 55.060494][ C0] ip_list_rcv+0x2f3/0x321 [ 55.064885][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 55.070946][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 55.077092][ C0] gro_normal_list.part.0+0x37/0xa0 [ 55.082265][ C0] gro_normal_one+0x14c/0x160 [ 55.086925][ C0] napi_gro_receive+0x27d/0x2f0 [ 55.091749][ C0] receive_buf+0x24c/0x3420 [ 55.096242][ C0] virtnet_poll+0x343/0x790 [ 55.100719][ C0] net_rx_action+0x3ad/0xac0 [ 55.105284][ C0] __do_softirq+0x118/0x34a [ 55.109763][ C0] run_ksoftirqd+0x41/0x60 [ 55.114160][ C0] smpboot_thread_fn+0x374/0x4a0 [ 55.119068][ C0] kthread+0x203/0x230 [ 55.123205][ C0] ret_from_fork+0x1f/0x30 [ 55.127585][ C0] [ 55.129885][ C0] Reported by Kernel Concurrency Sanitizer on: [ 55.136015][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 55.144105][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.154356][ C0] ================================================================== [ 55.162396][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 55.168965][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 55.176999][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.187043][ C0] Call Trace: [ 55.190302][ C0] [ 55.193137][ C0] dump_stack+0x11d/0x187 [ 55.197443][ C0] panic+0x210/0x640 [ 55.201316][ C0] ? vprintk_func+0x89/0x13a [ 55.205879][ C0] kcsan_report.cold+0xc/0x1a [ 55.210605][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 55.215982][ C0] tick_sched_do_timer+0x2e/0xd0 [ 55.220922][ C0] tick_sched_timer+0x3f/0xd0 [ 55.225706][ C0] __hrtimer_run_queues+0x271/0x600 [ 55.230905][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 55.236023][ C0] hrtimer_interrupt+0x226/0x490 [ 55.240954][ C0] ? kvm_clock_read+0x14/0x30 [ 55.245644][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 55.251102][ C0] apic_timer_interrupt+0xf/0x20 [ 55.256019][ C0] [ 55.259072][ C0] RIP: 0010:__nf_ct_refresh_acct+0x15d/0x1a0 [ 55.265042][ C0] Code: 4c 8b 44 24 08 ba 04 00 00 00 48 8d 74 24 14 44 89 6c 24 14 4c 89 c7 e8 51 f5 ff ff e9 0e ff ff ff e8 77 a9 49 fc 48 8b 1c 24 <48> 8d 7b 70 e8 ca d0 57 fc 44 8b 6b 70 44 89 f6 bf 02 00 00 00 e8 [ 55.284737][ C0] RSP: 0018:ffffc90000cb3578 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 55.293151][ C0] RAX: ffff88812b783000 RBX: ffff8881214a8500 RCX: ffffffff84fcf360 [ 55.301114][ C0] RDX: 0000000000000100 RSI: ffffffff84fcf449 RDI: 0000000000000001 [ 55.309881][ C0] RBP: 000000000292ce23 R08: ffff88812b783000 R09: 0000c90000cb358c [ 55.317868][ C0] R10: 0000c90000cb358c R11: 0000c90000cb358f R12: ffff8881255f9900 [ 55.325852][ C0] R13: 0000000000001553 R14: 0000000000000003 R15: ffff8881255f9980 [ 55.333944][ C0] ? __nf_ct_refresh_acct+0x70/0x1a0 [ 55.339316][ C0] ? __nf_ct_refresh_acct+0x159/0x1a0 [ 55.344702][ C0] ? __nf_ct_refresh_acct+0x159/0x1a0 [ 55.350071][ C0] nf_conntrack_tcp_packet+0xc63/0x2fe0 [ 55.355995][ C0] nf_conntrack_in+0x3fe/0xa60 [ 55.360781][ C0] ? nf_ct_bridge_unregister+0x70/0x70 [ 55.366350][ C0] ipv4_conntrack_in+0x23/0x40 [ 55.371136][ C0] nf_hook_slow+0x7c/0x160 [ 55.375653][ C0] nf_hook_slow_list+0x140/0x29f [ 55.380590][ C0] ip_sublist_rcv+0x4f9/0x530 [ 55.385276][ C0] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 55.391193][ C0] ? __this_cpu_preempt_check+0x3c/0x130 [ 55.396833][ C0] ? ip_sublist_rcv+0x530/0x530 [ 55.401694][ C0] ip_list_rcv+0x2f3/0x321 [ 55.406125][ C0] ? ip_rcv+0x1b0/0x1b0 [ 55.410300][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 55.416290][ C0] ? ktime_get_with_offset+0x1e6/0x230 [ 55.421764][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 55.427929][ C0] gro_normal_list.part.0+0x37/0xa0 [ 55.433214][ C0] ? __write_once_size+0x7c/0x100 [ 55.438349][ C0] gro_normal_one+0x14c/0x160 [ 55.443011][ C0] napi_gro_receive+0x27d/0x2f0 [ 55.447857][ C0] receive_buf+0x24c/0x3420 [ 55.452365][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0 [ 55.457823][ C0] virtnet_poll+0x343/0x790 [ 55.462311][ C0] net_rx_action+0x3ad/0xac0 [ 55.466902][ C0] __do_softirq+0x118/0x34a [ 55.471413][ C0] ? takeover_tasklets+0x240/0x240 [ 55.476516][ C0] run_ksoftirqd+0x41/0x60 [ 55.481018][ C0] smpboot_thread_fn+0x374/0x4a0 [ 55.485940][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 55.492182][ C0] kthread+0x203/0x230 [ 55.496235][ C0] ? kthread_unpark+0xd0/0xd0 [ 55.500920][ C0] ret_from_fork+0x1f/0x30 [ 55.506731][ C0] Kernel Offset: disabled [ 55.511055][ C0] Rebooting in 86400 seconds..