Warning: Permanently added '10.128.0.217' (ECDSA) to the list of known hosts. 2020/05/15 22:10:38 fuzzer started 2020/05/15 22:10:38 dialing manager at 10.128.0.105:37863 2020/05/15 22:10:39 syscalls: 3055 2020/05/15 22:10:39 code coverage: enabled 2020/05/15 22:10:39 comparison tracing: enabled 2020/05/15 22:10:39 extra coverage: enabled 2020/05/15 22:10:39 setuid sandbox: enabled 2020/05/15 22:10:39 namespace sandbox: enabled 2020/05/15 22:10:39 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/15 22:10:39 fault injection: enabled 2020/05/15 22:10:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/15 22:10:39 net packet injection: enabled 2020/05/15 22:10:39 net device setup: enabled 2020/05/15 22:10:39 concurrency sanitizer: enabled 2020/05/15 22:10:39 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/15 22:10:39 USB emulation: enabled syzkaller login: [ 50.936850][ T8921] KCSAN: could not find function: 'poll_schedule_timeout' [ 52.808047][ T8921] KCSAN: could not find function: '_find_next_bit' 2020/05/15 22:10:44 adding functions to KCSAN blacklist: 'ep_poll' 'tick_nohz_next_event' 'blk_mq_dispatch_rq_list' 'ktime_get_seconds' 'mod_timer' 'poll_schedule_timeout' 'copy_process' 'find_get_pages_range_tag' 'generic_write_end' 'xas_clear_mark' 'kauditd_thread' 'ext4_mark_iloc_dirty' '__filemap_fdatawrite_range' 'generic_file_read_iter' 'wbt_done' '__ext4_new_inode' 'page_counter_charge' 'tick_nohz_idle_stop_tick' 'futex_wait_queue_me' 'do_exit' 'vm_area_dup' 'do_wait' 'add_timer' '__lru_cache_add' 'pcpu_alloc' 'ext4_free_inodes_count' '_find_next_bit' '__mpage_writepage' 'tick_sched_do_timer' '__snd_rawmidi_transmit_ack' 'echo_char' 'audit_log_start' 'do_nanosleep' 'shmem_file_read_iter' 'blk_mq_get_request' 'ktime_get_real_seconds' 'ext4_writepages' 'do_syslog' '__perf_event_overflow' 'exit_signals' 'do_signal_stop' 'generic_fillattr' 'run_timer_softirq' '__add_to_page_cache_locked' 'dd_has_work' 'blk_mq_sched_dispatch_requests' [ 55.340287][ T1934] ================================================================== [ 55.348437][ T1934] BUG: KCSAN: data-race in calc_wb_limits.part.0 / wbt_inflight_cb [ 55.356328][ T1934] [ 55.358660][ T1934] write to 0xffff888129d42304 of 4 bytes by interrupt on cpu 0: [ 55.366291][ T1934] calc_wb_limits.part.0+0x70/0xa0 [ 55.371404][ T1934] scale_up+0x7d/0x250 [ 55.375495][ T1934] wb_timer_fn+0x2d6/0xad0 [ 55.379912][ T1934] blk_stat_timer_fn+0x3af/0x3d0 [ 55.384859][ T1934] call_timer_fn+0x58/0x2e0 [ 55.389363][ T1934] run_timer_softirq+0xb14/0xbd0 [ 55.394293][ T1934] __do_softirq+0x118/0x34a [ 55.398935][ T1934] irq_exit+0xb5/0xd0 [ 55.402980][ T1934] smp_apic_timer_interrupt+0xe2/0x270 [ 55.408429][ T1934] apic_timer_interrupt+0xf/0x20 [ 55.413370][ T1934] kcsan_setup_watchpoint+0x25a/0x440 [ 55.418743][ T1934] vm_normal_page+0x2c/0x220 [ 55.423456][ T1934] do_wp_page+0xee/0xca0 [ 55.427707][ T1934] __handle_mm_fault+0x2d96/0x2da0 [ 55.432819][ T1934] handle_mm_fault+0x21c/0x540 [ 55.437741][ T1934] do_page_fault+0x48a/0xa96 [ 55.442555][ T1934] page_fault+0x34/0x40 [ 55.446695][ T1934] [ 55.449016][ T1934] read to 0xffff888129d42304 of 4 bytes by task 1934 on cpu 1: [ 55.456567][ T1934] wbt_inflight_cb+0x47/0x220 [ 55.461249][ T1934] rq_qos_wait+0x26b/0x300 [ 55.465663][ T1934] wbt_wait+0x15f/0x260 [ 55.469868][ T1934] __rq_qos_throttle+0x42/0x70 [ 55.474631][ T1934] blk_mq_make_request+0x297/0xf60 [ 55.479746][ T1934] generic_make_request+0x196/0x700 [ 55.484945][ T1934] submit_bio+0x8f/0x3a0 [ 55.489176][ T1934] ext4_io_submit+0xdf/0x110 [ 55.493762][ T1934] ext4_writepages+0xd96/0x1e10 [ 55.498620][ T1934] do_writepages+0x6b/0x170 [ 55.503374][ T1934] __filemap_fdatawrite_range+0x1bb/0x220 [ 55.509092][ T1934] filemap_flush+0x2a/0x40 [ 55.513499][ T1934] collapse_file+0x27ca/0x27e0 [ 55.518252][ T1934] khugepaged+0x1e1d/0x2850 [ 55.522744][ T1934] kthread+0x203/0x230 [ 55.526937][ T1934] ret_from_fork+0x1f/0x30 [ 55.531331][ T1934] [ 55.533637][ T1934] Reported by Kernel Concurrency Sanitizer on: [ 55.539797][ T1934] CPU: 1 PID: 1934 Comm: khugepaged Not tainted 5.7.0-rc1-syzkaller #0 [ 55.548017][ T1934] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.558052][ T1934] ================================================================== [ 55.566142][ T1934] Kernel panic - not syncing: panic_on_warn set ... [ 55.572812][ T1934] CPU: 1 PID: 1934 Comm: khugepaged Not tainted 5.7.0-rc1-syzkaller #0 [ 55.581028][ T1934] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.591064][ T1934] Call Trace: [ 55.594352][ T1934] dump_stack+0x11d/0x187 [ 55.598680][ T1934] panic+0x210/0x640 [ 55.602569][ T1934] ? vprintk_func+0x89/0x13a [ 55.607200][ T1934] kcsan_report.cold+0xc/0x1a [ 55.611880][ T1934] kcsan_setup_watchpoint+0x3fb/0x440 [ 55.617256][ T1934] wbt_inflight_cb+0x47/0x220 [ 55.621934][ T1934] ? wbt_cleanup_cb+0x50/0x50 [ 55.626592][ T1934] rq_qos_wait+0x26b/0x300 [ 55.630999][ T1934] ? bio_advance+0x1d2/0x250 [ 55.635593][ T1934] ? __wbt_done+0xc0/0xc0 [ 55.639935][ T1934] ? __write_once_size.constprop.0+0x20/0x20 [ 55.645915][ T1934] ? wbt_cleanup_cb+0x50/0x50 [ 55.650634][ T1934] wbt_wait+0x15f/0x260 [ 55.654790][ T1934] ? wbt_cleanup+0x70/0x70 [ 55.659195][ T1934] __rq_qos_throttle+0x42/0x70 [ 55.663960][ T1934] blk_mq_make_request+0x297/0xf60 [ 55.669072][ T1934] generic_make_request+0x196/0x700 [ 55.674269][ T1934] submit_bio+0x8f/0x3a0 [ 55.678498][ T1934] ext4_io_submit+0xdf/0x110 [ 55.683079][ T1934] ext4_writepages+0xd96/0x1e10 [ 55.687951][ T1934] ? ext4_mark_inode_dirty+0x420/0x420 [ 55.693392][ T1934] ? do_writepages+0x6b/0x170 [ 55.698052][ T1934] do_writepages+0x6b/0x170 [ 55.702540][ T1934] ? _raw_spin_unlock+0x38/0x60 [ 55.707391][ T1934] ? wbc_attach_and_unlock_inode+0xdd/0x3b0 [ 55.713272][ T1934] ? __read_once_size.constprop.0+0xd/0x20 [ 55.719058][ T1934] __filemap_fdatawrite_range+0x1bb/0x220 [ 55.724761][ T1934] filemap_flush+0x2a/0x40 [ 55.729173][ T1934] collapse_file+0x27ca/0x27e0 [ 55.733938][ T1934] khugepaged+0x1e1d/0x2850 [ 55.738453][ T1934] ? collapse_pte_mapped_thp+0x7c0/0x7c0 [ 55.744081][ T1934] kthread+0x203/0x230 [ 55.748146][ T1934] ? kthread_unpark+0xd0/0xd0 [ 55.752819][ T1934] ret_from_fork+0x1f/0x30 [ 55.758689][ T1934] Kernel Offset: disabled [ 55.763072][ T1934] Rebooting in 86400 seconds..