[info] Using makefile-style concurrent boot in runlevel 2. [ 45.364482][ T26] audit: type=1800 audit(1583768550.363:21): pid=7658 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 45.415039][ T26] audit: type=1800 audit(1583768550.373:22): pid=7658 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.194' (ECDSA) to the list of known hosts. 2020/03/09 15:42:42 fuzzer started 2020/03/09 15:42:43 dialing manager at 10.128.0.105:40259 2020/03/09 15:42:43 syscalls: 2955 2020/03/09 15:42:43 code coverage: enabled 2020/03/09 15:42:43 comparison tracing: enabled 2020/03/09 15:42:43 extra coverage: enabled 2020/03/09 15:42:43 setuid sandbox: enabled 2020/03/09 15:42:43 namespace sandbox: enabled 2020/03/09 15:42:43 Android sandbox: /sys/fs/selinux/policy does not exist 2020/03/09 15:42:43 fault injection: enabled 2020/03/09 15:42:43 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/03/09 15:42:43 net packet injection: enabled 2020/03/09 15:42:43 net device setup: enabled 2020/03/09 15:42:43 concurrency sanitizer: enabled 2020/03/09 15:42:43 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 60.397721][ T7820] KCSAN: could not find function: '_find_next_bit' 2020/03/09 15:42:48 adding functions to KCSAN blacklist: 'copy_process' 'do_nanosleep' 'kauditd_thread' '_find_next_bit' '__mark_inode_dirty' 'mod_timer' 'echo_char' 'shmem_file_read_iter' 'ext4_mark_iloc_dirty' 'tick_nohz_idle_stop_tick' '__perf_event_overflow' 'generic_write_end' 'ep_poll' 'list_lru_count_one' 'xas_clear_mark' 'ext4_nonda_switch' 'generic_fillattr' '__ext4_new_inode' 'find_get_pages_range_tag' 'run_timer_softirq' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'ext4_setattr' [ 135.486920][ T0] ================================================================== [ 135.495116][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 135.503264][ T0] [ 135.505593][ T0] write to 0xffffffff85d05610 of 4 bytes by interrupt on cpu 1: [ 135.513225][ T0] tick_sched_do_timer+0xb4/0xd0 [ 135.518166][ T0] tick_sched_timer+0x3f/0xd0 [ 135.522845][ T0] __hrtimer_run_queues+0x271/0x600 [ 135.528050][ T0] hrtimer_interrupt+0x226/0x490 [ 135.533131][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 135.539158][ T0] apic_timer_interrupt+0xf/0x20 [ 135.544093][ T0] [ 135.546576][ T0] read to 0xffffffff85d05610 of 4 bytes by task 0 on cpu 0: [ 135.554148][ T0] tick_nohz_next_event+0x192/0x350 [ 135.559362][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 135.564919][ T0] do_idle+0x1ad/0x290 [ 135.568995][ T0] cpu_startup_entry+0x14/0x20 [ 135.573755][ T0] rest_init+0xe4/0xeb [ 135.577834][ T0] arch_call_rest_init+0x13/0x2b [ 135.582895][ T0] start_kernel+0xcc2/0xceb [ 135.587408][ T0] secondary_startup_64+0xa4/0xb0 [ 135.592702][ T0] [ 135.595037][ T0] Reported by Kernel Concurrency Sanitizer on: [ 135.601357][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 135.609243][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 135.619415][ T0] ================================================================== [ 135.627473][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 135.634072][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 135.641969][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 135.652368][ T0] Call Trace: [ 135.655697][ T0] dump_stack+0x11d/0x187 [ 135.660095][ T0] panic+0x210/0x640 [ 135.664024][ T0] ? vprintk_func+0x89/0x13a [ 135.668624][ T0] kcsan_report.cold+0xc/0x14 [ 135.673445][ T0] kcsan_setup_watchpoint+0x3e3/0x420 [ 135.678913][ T0] tick_nohz_next_event+0x192/0x350 [ 135.684121][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 135.690174][ T0] ? ktime_get+0x1c9/0x210 [ 135.694596][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 135.700069][ T0] do_idle+0x1ad/0x290 [ 135.704144][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 135.709627][ T0] cpu_startup_entry+0x14/0x20 [ 135.714405][ T0] rest_init+0xe4/0xeb [ 135.718495][ T0] arch_call_rest_init+0x13/0x2b [ 135.723539][ T0] start_kernel+0xcc2/0xceb [ 135.728090][ T0] secondary_startup_64+0xa4/0xb0 [ 135.734505][ T0] Kernel Offset: disabled [ 135.738838][ T0] Rebooting in 86400 seconds..