[ 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 '10.128.1.0' (ECDSA) to the list of known hosts. 2020/12/17 10:36:17 fuzzer started 2020/12/17 10:36:18 dialing manager at 10.128.0.105:40329 2020/12/17 10:36:18 syscalls: 3466 2020/12/17 10:36:18 code coverage: enabled 2020/12/17 10:36:18 comparison tracing: enabled 2020/12/17 10:36:18 extra coverage: enabled 2020/12/17 10:36:18 setuid sandbox: enabled 2020/12/17 10:36:18 namespace sandbox: enabled 2020/12/17 10:36:18 Android sandbox: /sys/fs/selinux/policy does not exist 2020/12/17 10:36:18 fault injection: enabled 2020/12/17 10:36:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/12/17 10:36:18 net packet injection: enabled 2020/12/17 10:36:18 net device setup: enabled 2020/12/17 10:36:18 concurrency sanitizer: enabled 2020/12/17 10:36:18 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/12/17 10:36:18 USB emulation: enabled 2020/12/17 10:36:18 hci packet injection: enabled 2020/12/17 10:36:18 wifi device emulation: enabled 2020/12/17 10:36:20 suppressing KCSAN reports in functions: 'attach_to_pi_owner' 'generic_write_end' 'blk_mq_sched_dispatch_requests' 'do_signal_stop' 'ext4_sync_file' 'kauditd_thread' 'complete_signal' 'ext4_ext_handle_unwritten_extents' 'xas_find_marked' 'expire_timers' 'xas_clear_mark' 'ext4_mb_regular_allocator' 'pcpu_alloc' '__add_to_page_cache_locked' 'ext4_mb_good_group' 'alloc_pid' 'exit_mm' 'find_get_pages_range_tag' 'blk_mq_request_bypass_insert' '_prb_read_valid' 'do_select' 'ext4_mark_iloc_dirty' '__ext4_new_inode' 'blk_mq_rq_ctx_init' 'do_sys_poll' '__find_get_block' 'ext4_free_inode' 'vfs_fsync_range' '__filemap_fdatawrite_range' '__ext4_update_other_inode_time' 'isolate_migratepages_block' 'do_nanosleep' 'ext4_writepages' 'blk_mq_dispatch_rq_list' 'dd_has_work' 'n_tty_receive_buf_common' '__mark_inode_dirty' 'ext4_free_inodes_count' 'wbt_issue' syzkaller login: [ 34.659839][ T0] ================================================================== [ 34.667915][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer [ 34.675780][ T0] [ 34.678074][ T0] write to 0xffffffff86fc3c60 of 4 bytes by interrupt on cpu 0: [ 34.685705][ T0] tick_sched_timer+0x1e7/0x200 [ 34.690535][ T0] __run_hrtimer+0x133/0x420 [ 34.695227][ T0] hrtimer_interrupt+0x36e/0xa10 [ 34.700158][ T0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 34.706028][ T0] sysvec_apic_timer_interrupt+0x6f/0x90 [ 34.711632][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 34.717593][ T0] [ 34.719930][ T0] read to 0xffffffff86fc3c60 of 4 bytes by task 0 on cpu 1: [ 34.727186][ T0] tick_nohz_next_event+0x217/0x300 [ 34.732362][ T0] tick_nohz_get_sleep_length+0x121/0x270 [ 34.738055][ T0] menu_select+0x2fa/0xf40 [ 34.742442][ T0] cpuidle_select+0x3d/0x50 [ 34.746920][ T0] do_idle+0x15f/0x230 [ 34.750965][ T0] cpu_startup_entry+0x15/0x20 [ 34.755701][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 34.761568][ T0] [ 34.763865][ T0] Reported by Kernel Concurrency Sanitizer on: [ 34.769981][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-syzkaller #0 [ 34.777617][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.787641][ T0] ================================================================== [ 34.795672][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 34.802227][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-syzkaller #0 [ 34.809827][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.819905][ T0] Call Trace: [ 34.823166][ T0] dump_stack+0x116/0x15d [ 34.827515][ T0] panic+0x1e7/0x5fa [ 34.831420][ T0] ? vprintk_emit+0x2e2/0x360 [ 34.836080][ T0] kcsan_report+0x67b/0x680 [ 34.840561][ T0] ? kcsan_setup_watchpoint+0x47b/0x4e0 [ 34.846087][ T0] ? tick_nohz_next_event+0x217/0x300 [ 34.851431][ T0] ? tick_nohz_get_sleep_length+0x121/0x270 [ 34.857293][ T0] ? menu_select+0x2fa/0xf40 [ 34.861854][ T0] ? cpuidle_select+0x3d/0x50 [ 34.866671][ T0] ? do_idle+0x15f/0x230 [ 34.870894][ T0] ? cpu_startup_entry+0x15/0x20 [ 34.875839][ T0] ? secondary_startup_64_no_verify+0xb0/0xbb [ 34.881920][ T0] ? ktime_get+0x1b0/0x1e0 [ 34.886341][ T0] kcsan_setup_watchpoint+0x47b/0x4e0 [ 34.891728][ T0] tick_nohz_next_event+0x217/0x300 [ 34.896925][ T0] tick_nohz_get_sleep_length+0x121/0x270 [ 34.902644][ T0] menu_select+0x2fa/0xf40 [ 34.907055][ T0] ? _raw_spin_unlock_irq+0x22/0x40 [ 34.912252][ T0] ? finish_task_switch+0x90/0x3a0 [ 34.917355][ T0] cpuidle_select+0x3d/0x50 [ 34.921849][ T0] do_idle+0x15f/0x230 [ 34.925900][ T0] cpu_startup_entry+0x15/0x20 [ 34.930655][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 34.937163][ T0] Kernel Offset: disabled [ 34.941473][ T0] Rebooting in 86400 seconds..