[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. 2020/06/18 08:10:04 fuzzer started 2020/06/18 08:10:04 dialing manager at 10.128.0.105:41225 2020/06/18 08:10:05 syscalls: 3089 2020/06/18 08:10:05 code coverage: enabled 2020/06/18 08:10:05 comparison tracing: enabled 2020/06/18 08:10:05 extra coverage: enabled 2020/06/18 08:10:05 setuid sandbox: enabled 2020/06/18 08:10:05 namespace sandbox: enabled 2020/06/18 08:10:05 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/18 08:10:05 fault injection: enabled 2020/06/18 08:10:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/18 08:10:05 net packet injection: enabled 2020/06/18 08:10:05 net device setup: enabled 2020/06/18 08:10:05 concurrency sanitizer: enabled 2020/06/18 08:10:05 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/18 08:10:05 USB emulation: enabled syzkaller login: [ 54.117331][ T8920] KCSAN: could not find function: '_find_next_bit' 2020/06/18 08:10:10 suppressing KCSAN reports in functions: 'echo_char' '__ext4_new_inode' 'run_timer_softirq' 'blk_mq_sched_dispatch_requests' 'n_tty_receive_buf_common' 'mod_timer' 'xas_find_marked' 'futex_wait_queue_me' 'page_counter_charge' 'tick_sched_do_timer' 'do_wait' '__delete_from_page_cache' 'io_sq_thread' 'ext4_free_inodes_count' 'do_signal_stop' 'direct_page_fault' '_find_next_bit' 'fat12_ent_put' 'generic_fillattr' 'shmem_getpage_gfp' '__bpf_lru_node_move_in' 'iput' 'generic_write_end' 'tick_nohz_idle_stop_tick' 'copy_process' 'ext4_da_write_end' 'kauditd_thread' 'ptrace_check_attach' 'ktime_get_real_seconds' 'vti_tunnel_xmit' 'generic_file_read_iter' 'pcpu_alloc' 'tick_nohz_next_event' 'pipe_double_lock' 'alloc_pid' 'do_nanosleep' 'add_timer' 'file_update_time' 'find_get_pages_range_tag' 'ext4_mark_iloc_dirty' 'do_syslog' 'xas_clear_mark' 'audit_log_start' 'atime_needs_update' 'ep_poll' 'blk_mq_get_request' 'blk_mq_dispatch_rq_list' '__mark_inode_dirty' 'shmem_file_read_iter' 'ondemand_readahead' [ 201.023442][ T8907] ================================================================== [ 201.031596][ T8907] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 201.039473][ T8907] [ 201.041798][ T8907] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0: [ 201.049598][ T8907] timekeeping_advance+0x88e/0xd80 [ 201.054687][ T8907] update_wall_time+0x15/0x20 [ 201.059343][ T8907] tick_do_update_jiffies64+0x1e5/0x2a0 [ 201.064888][ T8907] tick_sched_do_timer+0xc7/0xd0 [ 201.069948][ T8907] tick_sched_timer+0x3f/0xd0 [ 201.074600][ T8907] __hrtimer_run_queues+0x271/0x600 [ 201.079772][ T8907] hrtimer_interrupt+0x226/0x490 [ 201.084696][ T8907] smp_apic_timer_interrupt+0xd8/0x270 [ 201.090166][ T8907] apic_timer_interrupt+0xf/0x20 [ 201.095109][ T8907] __sanitizer_cov_trace_cmp4+0x4/0x20 [ 201.100669][ T8907] receive_buf+0x97/0x3420 [ 201.105078][ T8907] virtnet_poll+0x343/0x790 [ 201.109700][ T8907] net_rx_action+0x3ad/0xac0 [ 201.114280][ T8907] __do_softirq+0x118/0x34a [ 201.118847][ T8907] run_ksoftirqd+0x41/0x60 [ 201.123241][ T8907] smpboot_thread_fn+0x374/0x4a0 [ 201.128155][ T8907] kthread+0x203/0x230 [ 201.132198][ T8907] ret_from_fork+0x1f/0x30 [ 201.136606][ T8907] [ 201.138915][ T8907] read to 0xffffffff88ae9140 of 8 bytes by task 8907 on cpu 1: [ 201.146455][ T8907] ktime_get_seconds+0x42/0x60 [ 201.151196][ T8907] tcp_rcv_established+0xe79/0xee0 [ 201.156281][ T8907] tcp_v4_do_rcv+0x396/0x4f0 [ 201.160847][ T8907] __release_sock+0x130/0x1e0 [ 201.165504][ T8907] release_sock+0x5e/0x160 [ 201.169894][ T8907] tcp_recvmsg+0x68e/0x1ba0 [ 201.174395][ T8907] inet_recvmsg+0xc1/0x250 [ 201.178795][ T8907] sock_recvmsg+0x8e/0xb0 [ 201.183122][ T8907] sock_read_iter+0x185/0x230 [ 201.187793][ T8907] new_sync_read+0x416/0x450 [ 201.192358][ T8907] __vfs_read+0x9e/0xb0 [ 201.196488][ T8907] vfs_read+0x13e/0x2b0 [ 201.200630][ T8907] ksys_read+0x16a/0x1a0 [ 201.204866][ T8907] __x64_sys_read+0x49/0x60 [ 201.209350][ T8907] do_syscall_64+0xc7/0x3b0 [ 201.213848][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 201.219716][ T8907] [ 201.222041][ T8907] Reported by Kernel Concurrency Sanitizer on: [ 201.228233][ T8907] CPU: 1 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 201.236562][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 201.246698][ T8907] ================================================================== [ 201.254750][ T8907] Kernel panic - not syncing: panic_on_warn set ... [ 201.261334][ T8907] CPU: 1 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 201.269545][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 201.279575][ T8907] Call Trace: [ 201.282870][ T8907] dump_stack+0x11d/0x187 [ 201.287207][ T8907] panic+0x210/0x640 [ 201.291097][ T8907] ? vprintk_func+0x89/0x13a [ 201.295668][ T8907] kcsan_report.cold+0xc/0x1a [ 201.300337][ T8907] kcsan_setup_watchpoint+0x3fb/0x440 [ 201.305703][ T8907] ktime_get_seconds+0x42/0x60 [ 201.310468][ T8907] tcp_rcv_established+0xe79/0xee0 [ 201.315577][ T8907] tcp_v4_do_rcv+0x396/0x4f0 [ 201.320327][ T8907] __release_sock+0x130/0x1e0 [ 201.324996][ T8907] release_sock+0x5e/0x160 [ 201.329406][ T8907] tcp_recvmsg+0x68e/0x1ba0 [ 201.333895][ T8907] inet_recvmsg+0xc1/0x250 [ 201.338307][ T8907] ? apparmor_socket_recvmsg+0x38/0x40 [ 201.343940][ T8907] ? inet_sendpage+0xf0/0xf0 [ 201.348523][ T8907] sock_recvmsg+0x8e/0xb0 [ 201.355018][ T8907] sock_read_iter+0x185/0x230 [ 201.359806][ T8907] new_sync_read+0x416/0x450 [ 201.364382][ T8907] __vfs_read+0x9e/0xb0 [ 201.368518][ T8907] vfs_read+0x13e/0x2b0 [ 201.372650][ T8907] ksys_read+0x16a/0x1a0 [ 201.376892][ T8907] __x64_sys_read+0x49/0x60 [ 201.381373][ T8907] do_syscall_64+0xc7/0x3b0 [ 201.385898][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 201.391764][ T8907] RIP: 0033:0x4b3cdb [ 201.395640][ T8907] Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 bb a1 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 201.415235][ T8907] RSP: 002b:000000c00034d8b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 201.423631][ T8907] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 201.431580][ T8907] RDX: 0000000000001000 RSI: 000000c00010e000 RDI: 0000000000000006 [ 201.439543][ T8907] RBP: 000000c00034d908 R08: 00007ffdf876f001 R09: 00000000000000c9 [ 201.447570][ T8907] R10: 0000000000000072 R11: 0000000000000212 R12: 0000000000000003 [ 201.455526][ T8907] R13: 000000c000000900 R14: 0000000000000008 R15: 0000000000000008 [ 201.465019][ T8907] Kernel Offset: disabled [ 201.469430][ T8907] Rebooting in 86400 seconds..