[ 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 '10.128.0.79' (ECDSA) to the list of known hosts. 2020/04/17 07:34:09 fuzzer started syzkaller login: [ 44.593214][ T6695] ld (6695) used greatest stack depth: 10440 bytes left 2020/04/17 07:34:11 dialing manager at 10.128.0.105:37921 2020/04/17 07:34:12 syscalls: 2960 2020/04/17 07:34:12 code coverage: enabled 2020/04/17 07:34:12 comparison tracing: enabled 2020/04/17 07:34:12 extra coverage: enabled 2020/04/17 07:34:12 setuid sandbox: enabled 2020/04/17 07:34:12 namespace sandbox: enabled 2020/04/17 07:34:12 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/17 07:34:12 fault injection: enabled 2020/04/17 07:34:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/17 07:34:12 net packet injection: enabled 2020/04/17 07:34:12 net device setup: enabled 2020/04/17 07:34:12 concurrency sanitizer: enabled 2020/04/17 07:34:12 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/04/17 07:34:12 USB emulation: /dev/raw-gadget does not exist [ 46.406195][ T6699] KCSAN: could not find function: '_find_next_bit' 2020/04/17 07:34:13 adding functions to KCSAN blacklist: '__snd_rawmidi_transmit_ack' 'shmem_file_read_iter' 'alloc_pid' 'ext4_mark_iloc_dirty' 'wbt_done' 'attach_to_pi_owner' 'find_get_pages_range_tag' 'generic_write_end' 'page_counter_charge' '_find_next_bit' 'add_timer' 'ep_poll' 'xas_clear_mark' '__ext4_new_inode' [ 76.473422][ T0] ================================================================== [ 76.481649][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 76.490685][ T0] [ 76.493016][ T0] write to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 0: [ 76.500391][ T0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 76.505935][ T0] do_idle+0x1ad/0x290 [ 76.510006][ T0] cpu_startup_entry+0x14/0x20 [ 76.514773][ T0] rest_init+0xe4/0xeb [ 76.518848][ T0] arch_call_rest_init+0x13/0x2b [ 76.523815][ T0] start_kernel+0x82d/0x852 [ 76.528320][ T0] secondary_startup_64+0xa4/0xb0 [ 76.533329][ T0] [ 76.535674][ T0] read to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 1: [ 76.542967][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 76.548513][ T0] do_idle+0x1ad/0x290 [ 76.552584][ T0] cpu_startup_entry+0x14/0x20 [ 76.557361][ T0] start_secondary+0x169/0x1b0 [ 76.562166][ T0] secondary_startup_64+0xa4/0xb0 [ 76.567177][ T0] [ 76.569587][ T0] Reported by Kernel Concurrency Sanitizer on: [ 76.575744][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 76.583629][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.593675][ T0] ================================================================== [ 76.601729][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 76.608314][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 76.616197][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.626248][ T0] Call Trace: [ 76.629552][ T0] dump_stack+0x11d/0x187 [ 76.633888][ T0] panic+0x210/0x640 [ 76.637787][ T0] ? vprintk_func+0x89/0x13a [ 76.642385][ T0] kcsan_report.cold+0xc/0x1a [ 76.647068][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 76.652443][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 76.657997][ T0] do_idle+0x1ad/0x290 [ 76.662074][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 76.667543][ T0] cpu_startup_entry+0x14/0x20 [ 76.672369][ T0] start_secondary+0x169/0x1b0 [ 76.677137][ T0] secondary_startup_64+0xa4/0xb0 [ 76.683594][ T0] Kernel Offset: disabled [ 76.687967][ T0] Rebooting in 86400 seconds..