[info] Using makefile-style concurrent boot in runlevel 2.
[   42.887891][   T26] audit: type=1800 audit(1585439637.769:21): pid=7628 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   42.931539][   T26] audit: type=1800 audit(1585439637.769:22): pid=7628 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 '10.128.0.243' (ECDSA) to the list of known hosts.
2020/03/28 23:54:08 fuzzer started
2020/03/28 23:54:10 dialing manager at 10.128.0.105:35999
2020/03/28 23:54:13 syscalls: 2955
2020/03/28 23:54:13 code coverage: enabled
2020/03/28 23:54:13 comparison tracing: enabled
2020/03/28 23:54:13 extra coverage: enabled
2020/03/28 23:54:13 setuid sandbox: enabled
2020/03/28 23:54:13 namespace sandbox: enabled
2020/03/28 23:54:13 Android sandbox: /sys/fs/selinux/policy does not exist
2020/03/28 23:54:13 fault injection: enabled
2020/03/28 23:54:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/03/28 23:54:13 net packet injection: enabled
2020/03/28 23:54:13 net device setup: enabled
2020/03/28 23:54:13 concurrency sanitizer: enabled
2020/03/28 23:54:13 devlink PCI setup: PCI device 0000:00:10.0 is not available
syzkaller login: [   59.046111][ T7796] KCSAN: could not find function: '_find_next_bit'
2020/03/28 23:54:14 adding functions to KCSAN blacklist: 'ext4_set_iomap' 'run_timer_softirq' '_find_next_bit' '__ext4_new_inode' 'generic_write_end' 'blk_mq_sched_dispatch_requests' 'ext4_nonda_switch' 'find_get_pages_range_tag' 'kauditd_thread' 'wbt_done' 'ep_poll' 'ext4_free_inodes_count' 'n_tty_receive_buf_common' 'filemap_map_pages' 
[   91.715328][    T0] ==================================================================
[   91.723444][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event
[   91.732012][    T0] 
[   91.734324][    T0] write to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 1:
[   91.741673][    T0]  tick_nohz_idle_stop_tick+0x52c/0x680
[   91.747195][    T0]  do_idle+0x1ad/0x290
[   91.751243][    T0]  cpu_startup_entry+0x14/0x20
[   91.755990][    T0]  start_secondary+0x164/0x1b0
[   91.760742][    T0]  secondary_startup_64+0xa4/0xb0
[   91.765735][    T0] 
[   91.768570][    T0] read to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 0:
[   91.775831][    T0]  tick_nohz_next_event+0x192/0x350
[   91.781020][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   91.786543][    T0]  do_idle+0x1ad/0x290
[   91.790599][    T0]  cpu_startup_entry+0x14/0x20
[   91.795352][    T0]  rest_init+0xe4/0xeb
[   91.799409][    T0]  arch_call_rest_init+0x13/0x2b
[   91.804333][    T0]  start_kernel+0xcc2/0xceb
[   91.808942][    T0]  secondary_startup_64+0xa4/0xb0
[   91.814016][    T0] 
[   91.816329][    T0] Reported by Kernel Concurrency Sanitizer on:
[   91.822478][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   91.830352][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   91.840444][    T0] ==================================================================
[   91.848505][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   91.855081][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   91.862948][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   91.873003][    T0] Call Trace:
[   91.876292][    T0]  dump_stack+0x11d/0x187
[   91.880608][    T0]  panic+0x210/0x640
[   91.884487][    T0]  ? vprintk_func+0x89/0x13a
[   91.889064][    T0]  kcsan_report.cold+0xc/0xf
[   91.893645][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   91.899014][    T0]  tick_nohz_next_event+0x192/0x350
[   91.904200][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   91.909735][    T0]  ? ktime_get+0x1c9/0x210
[   91.914235][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   91.919696][    T0]  do_idle+0x1ad/0x290
[   91.923752][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   91.929210][    T0]  cpu_startup_entry+0x14/0x20
[   91.933959][    T0]  rest_init+0xe4/0xeb
[   91.938013][    T0]  arch_call_rest_init+0x13/0x2b
[   91.942930][    T0]  start_kernel+0xcc2/0xceb
[   91.947415][    T0]  secondary_startup_64+0xa4/0xb0
[   91.953754][    T0] Kernel Offset: disabled
[   91.958091][    T0] Rebooting in 86400 seconds..