[ 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 '10.128.15.211' (ECDSA) to the list of known hosts. 2020/12/21 01:24:08 fuzzer started 2020/12/21 01:24:08 dialing manager at 10.128.0.105:45005 2020/12/21 01:24:08 syscalls: 3466 2020/12/21 01:24:08 code coverage: enabled 2020/12/21 01:24:08 comparison tracing: enabled 2020/12/21 01:24:08 extra coverage: enabled 2020/12/21 01:24:08 setuid sandbox: enabled 2020/12/21 01:24:08 namespace sandbox: enabled 2020/12/21 01:24:08 Android sandbox: /sys/fs/selinux/policy does not exist 2020/12/21 01:24:08 fault injection: enabled 2020/12/21 01:24:08 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/12/21 01:24:08 net packet injection: enabled 2020/12/21 01:24:08 net device setup: enabled 2020/12/21 01:24:08 concurrency sanitizer: enabled 2020/12/21 01:24:08 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/12/21 01:24:08 USB emulation: enabled 2020/12/21 01:24:08 hci packet injection: enabled 2020/12/21 01:24:08 wifi device emulation: enabled 2020/12/21 01:24:12 suppressing KCSAN reports in functions: 'exit_mm' '__add_to_page_cache_locked' '__io_cqring_fill_event' 'wbt_wait' 'isolate_migratepages_block' 'audit_log_start' 'wbt_issue' '__ext4_update_other_inode_time' 'blk_mq_dispatch_rq_list' 'kauditd_thread' 'lru_add_drain_all' 'complete_signal' 'generic_write_end' 'futex_wait_queue_me' '__mark_inode_dirty' 'blk_mq_request_bypass_insert' '__ext4_new_inode' 'ext4_free_inodes_count' 'n_tty_receive_buf_common' 'generic_file_buffered_read' '__xa_set_mark' 'ext4_set_iomap' 'blk_mq_rq_ctx_init' 'expire_timers' 'alloc_pid' 'ext4_writepages' 'do_select' '__wb_update_bandwidth' '_prb_read_valid' 'ext4_free_inode' 'ext4_mb_good_group' '__delete_from_page_cache' 'pcpu_alloc' 'bpf_lru_pop_free' 'shmem_add_to_page_cache' '__xa_clear_mark' 'ext4_ext_insert_extent' '__fsnotify_parent' 'sit_tunnel_xmit' 'dd_has_work' 'ext4_mb_regular_allocator' 'do_nanosleep' 'exit_signals' 'shmem_file_read_iter' '__blkdev_put' 'xas_clear_mark' 'blk_mq_unfreeze_queue' 'ext4_mark_iloc_dirty' 'xas_find_marked' 'find_get_pages_range_tag' 'do_signal_stop' 'do_sys_poll' 'ext4_setattr' 'step_into' 'blk_mq_sched_dispatch_requests' '__filemap_fdatawrite_range' syzkaller login: [ 54.570593][ C1] ================================================================== [ 54.578747][ C1] BUG: KCSAN: data-race in fprop_reflect_period_percpu / fprop_reflect_period_percpu [ 54.588194][ C1] [ 54.590512][ C1] write to 0xffff8881025cd9c8 of 4 bytes by task 227 on cpu 0: [ 54.598027][ C1] fprop_reflect_period_percpu+0x17c/0x1a0 [ 54.603824][ C1] __fprop_inc_percpu_max+0x3f/0x1f0 [ 54.609100][ C1] __wb_writeout_inc+0x7b/0x1c0 [ 54.613931][ C1] test_clear_page_writeback+0x3a4/0x520 [ 54.619584][ C1] end_page_writeback+0xd7/0x260 [ 54.624504][ C1] ext4_finish_bio+0x429/0x490 [ 54.629245][ C1] ext4_release_io_end+0x98/0x200 [ 54.634244][ C1] ext4_end_io_rsv_work+0x306/0x360 [ 54.639415][ C1] process_one_work+0x3e1/0x950 [ 54.644239][ C1] worker_thread+0x635/0xb90 [ 54.648805][ C1] kthread+0x1fd/0x220 [ 54.652848][ C1] ret_from_fork+0x1f/0x30 [ 54.657253][ C1] [ 54.659550][ C1] read to 0xffff8881025cd9c8 of 4 bytes by interrupt on cpu 1: [ 54.667078][ C1] fprop_reflect_period_percpu+0x32/0x1a0 [ 54.672792][ C1] __fprop_inc_percpu_max+0x3f/0x1f0 [ 54.678053][ C1] __wb_writeout_inc+0x7b/0x1c0 [ 54.682879][ C1] test_clear_page_writeback+0x3a4/0x520 [ 54.688486][ C1] end_page_writeback+0xd7/0x260 [ 54.693405][ C1] ext4_finish_bio+0x429/0x490 [ 54.698159][ C1] ext4_end_bio+0x1ba/0x310 [ 54.702635][ C1] bio_endio+0x285/0x350 [ 54.706876][ C1] blk_update_request+0x4e5/0xb00 [ 54.711890][ C1] scsi_end_request+0x51/0x470 [ 54.716628][ C1] scsi_io_completion+0x104/0xfb0 [ 54.721626][ C1] scsi_finish_command+0x263/0x2b0 [ 54.726709][ C1] scsi_softirq_done+0xdf/0x440 [ 54.731536][ C1] blk_done_softirq+0x145/0x190 [ 54.736374][ C1] __do_softirq+0x13c/0x2c3 [ 54.740849][ C1] asm_call_irq_on_stack+0xf/0x20 [ 54.745858][ C1] do_softirq_own_stack+0x32/0x40 [ 54.750872][ C1] __irq_exit_rcu+0xb4/0xc0 [ 54.755351][ C1] common_interrupt+0xb5/0x130 [ 54.760101][ C1] asm_common_interrupt+0x1e/0x40 [ 54.765109][ C1] [ 54.767421][ C1] Reported by Kernel Concurrency Sanitizer on: [ 54.773556][ C1] CPU: 1 PID: 8462 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 54.781519][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.791548][ C1] ================================================================== [ 54.799596][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 54.806152][ C1] CPU: 1 PID: 8462 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 54.814103][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.824134][ C1] Call Trace: [ 54.827392][ C1] [ 54.830247][ C1] dump_stack+0x116/0x15d [ 54.834592][ C1] panic+0x1e7/0x5fa [ 54.838500][ C1] ? vprintk_emit+0x2e2/0x360 [ 54.843516][ C1] kcsan_report+0x67b/0x680 [ 54.847993][ C1] ? kcsan_setup_watchpoint+0x47b/0x4e0 [ 54.853509][ C1] ? fprop_reflect_period_percpu+0x32/0x1a0 [ 54.859387][ C1] ? __fprop_inc_percpu_max+0x3f/0x1f0 [ 54.864820][ C1] ? __wb_writeout_inc+0x7b/0x1c0 [ 54.869821][ C1] ? test_clear_page_writeback+0x3a4/0x520 [ 54.875603][ C1] ? end_page_writeback+0xd7/0x260 [ 54.880690][ C1] ? ext4_finish_bio+0x429/0x490 [ 54.885604][ C1] ? ext4_end_bio+0x1ba/0x310 [ 54.890255][ C1] ? bio_endio+0x285/0x350 [ 54.894680][ C1] ? blk_update_request+0x4e5/0xb00 [ 54.899851][ C1] ? scsi_end_request+0x51/0x470 [ 54.904764][ C1] ? scsi_io_completion+0x104/0xfb0 [ 54.909948][ C1] ? scsi_finish_command+0x263/0x2b0 [ 54.915219][ C1] ? scsi_softirq_done+0xdf/0x440 [ 54.920231][ C1] ? blk_done_softirq+0x145/0x190 [ 54.925236][ C1] ? __do_softirq+0x13c/0x2c3 [ 54.929888][ C1] ? asm_call_irq_on_stack+0xf/0x20 [ 54.935083][ C1] ? do_softirq_own_stack+0x32/0x40 [ 54.940263][ C1] ? __irq_exit_rcu+0xb4/0xc0 [ 54.944934][ C1] ? common_interrupt+0xb5/0x130 [ 54.949869][ C1] ? asm_common_interrupt+0x1e/0x40 [ 54.955042][ C1] ? find_next_bit+0xa7/0xf0 [ 54.959609][ C1] ? cpumask_next+0xc/0x30 [ 54.964015][ C1] ? select_idle_smt+0x47/0xb0 [ 54.968765][ C1] kcsan_setup_watchpoint+0x47b/0x4e0 [ 54.974123][ C1] ? update_curr+0x10f/0x390 [ 54.978685][ C1] fprop_reflect_period_percpu+0x32/0x1a0 [ 54.984387][ C1] __fprop_inc_percpu_max+0x3f/0x1f0 [ 54.989649][ C1] ? percpu_counter_add_batch+0xe1/0x100 [ 54.995257][ C1] __wb_writeout_inc+0x7b/0x1c0 [ 55.000100][ C1] test_clear_page_writeback+0x3a4/0x520 [ 55.005707][ C1] ? __queue_work+0x7ca/0xa90 [ 55.010362][ C1] end_page_writeback+0xd7/0x260 [ 55.015292][ C1] ext4_finish_bio+0x429/0x490 [ 55.020032][ C1] ext4_end_bio+0x1ba/0x310 [ 55.024510][ C1] ? __rcu_read_unlock+0x51/0x250 [ 55.029523][ C1] ? bio_uninit+0xef/0x160 [ 55.033924][ C1] ? ext4_finish_bio+0x490/0x490 [ 55.038837][ C1] bio_endio+0x285/0x350 [ 55.043054][ C1] blk_update_request+0x4e5/0xb00 [ 55.048064][ C1] scsi_end_request+0x51/0x470 [ 55.052828][ C1] scsi_io_completion+0x104/0xfb0 [ 55.057828][ C1] scsi_finish_command+0x263/0x2b0 [ 55.062943][ C1] scsi_softirq_done+0xdf/0x440 [ 55.067769][ C1] blk_done_softirq+0x145/0x190 [ 55.072595][ C1] __do_softirq+0x13c/0x2c3 [ 55.077088][ C1] asm_call_irq_on_stack+0xf/0x20 [ 55.082087][ C1] [ 55.085003][ C1] do_softirq_own_stack+0x32/0x40 [ 55.090011][ C1] __irq_exit_rcu+0xb4/0xc0 [ 55.094492][ C1] common_interrupt+0xb5/0x130 [ 55.099236][ C1] ? asm_common_interrupt+0x8/0x40 [ 55.104408][ C1] asm_common_interrupt+0x1e/0x40 [ 55.109416][ C1] RIP: 0033:0x668ad7 [ 55.113285][ C1] Code: 00 00 00 48 89 4c 24 70 48 89 44 24 78 48 8b 6c 24 48 48 83 c4 50 c3 48 8d ba e0 10 00 00 e8 60 e4 df ff eb c7 4c 89 c1 d3 eb <89> 5e 18 48 29 cf 48 89 7e 20 41 c1 e9 04 4c 89 4c 24 68 0f 57 c0 [ 55.132877][ C1] RSP: 002b:000000c0003e3ab8 EFLAGS: 00000202 [ 55.138922][ C1] RAX: 00000000000004cf RBX: 0000000000000002 RCX: 0000000000000009 [ 55.146867][ C1] RDX: 000000c000358028 RSI: 000000c000358000 RDI: 000000000000000f [ 55.154825][ C1] RBP: 000000c0003e3b00 R08: 0000000000000009 R09: 0000000000000d79 [ 55.162784][ C1] R10: 0000000000004fcf R11: 000000000000016a R12: ffffffffffffffff [ 55.170730][ C1] R13: 0000000000002000 R14: 0000000000000002 R15: 0000000000000002 [ 55.179152][ C1] Kernel Offset: disabled [ 55.183466][ C1] Rebooting in 86400 seconds..