[ 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 '10.128.10.11' (ECDSA) to the list of known hosts. 2021/03/23 22:27:49 fuzzer started 2021/03/23 22:27:49 dialing manager at 10.128.0.163:33969 2021/03/23 22:27:49 syscalls: 3557 2021/03/23 22:27:49 code coverage: enabled 2021/03/23 22:27:49 comparison tracing: enabled 2021/03/23 22:27:49 extra coverage: enabled 2021/03/23 22:27:49 setuid sandbox: enabled 2021/03/23 22:27:49 namespace sandbox: enabled 2021/03/23 22:27:49 Android sandbox: /sys/fs/selinux/policy does not exist 2021/03/23 22:27:49 fault injection: enabled 2021/03/23 22:27:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/03/23 22:27:49 net packet injection: enabled 2021/03/23 22:27:49 net device setup: enabled 2021/03/23 22:27:49 concurrency sanitizer: enabled 2021/03/23 22:27:49 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/03/23 22:27:49 USB emulation: enabled 2021/03/23 22:27:49 hci packet injection: enabled 2021/03/23 22:27:49 wifi device emulation: enabled 2021/03/23 22:27:49 802.15.4 emulation: enabled 2021/03/23 22:27:53 suppressing KCSAN reports in functions: '__xa_clear_mark' 'do_signal_stop' 'shmem_mknod' 'xas_find_marked' 'do_sys_poll' 'wbt_issue' 'audit_log_start' 'kauditd_thread' 'ps2_do_sendbyte' 'prandom_seed' 'ext4_write_end' 'ext4_mb_good_group' '__add_to_page_cache_locked' 'alloc_pid' 'isolate_migratepages_block' 'wbt_wait' 'vfs_fsync_range' '__find_get_block' 'next_uptodate_page' 'do_select' 'ext4_writepages' 'handle_mmio_page_fault' 'shmem_add_to_page_cache' 'ext4_sync_file' 'blk_mq_request_bypass_insert' 'ext4_free_inode' 'futex_wait_queue_me' '__ext4_new_inode' 'expire_timers' '_prb_read_valid' 'wbt_done' 'blk_mq_dispatch_rq_list' '__filemap_fdatawrite_range' '__mark_inode_dirty' 'ext4_mark_iloc_dirty' 'exit_mm' '__blkdev_put' 'blk_mq_sched_dispatch_requests' 'n_tty_receive_buf_common' 'xas_clear_mark' 'dd_has_work' 'do_nanosleep' '__writeback_single_inode' 'blk_mq_rq_ctx_init' 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wp_page_copy+0x881/0x1570 [ 50.688038][ T1639] do_wp_page+0x4cf/0x740 [ 50.692364][ T1639] handle_mm_fault+0x1463/0x1840 [ 50.697317][ T1639] do_user_addr_fault+0x60c/0xc00 [ 50.702333][ T1639] exc_page_fault+0x94/0x2a0 [ 50.706921][ T1639] asm_exc_page_fault+0x1e/0x30 [ 50.711770][ T1639] [ 50.714085][ T1639] read to 0xffff88813bc27550 of 1 bytes by task 1639 on cpu 1: [ 50.721617][ T1639] lru_add_drain_all+0x108/0x3c0 [ 50.726683][ T1639] khugepaged_do_scan+0x47/0x330 [ 50.731753][ T1639] khugepaged+0x75/0x680 [ 50.735971][ T1639] kthread+0x20b/0x230 [ 50.740014][ T1639] ret_from_fork+0x1f/0x30 [ 50.744405][ T1639] 2021/03/23 22:28:11 fetching corpus: 16272, signal 407641/686099 (executing program) [ 50.746702][ T1639] Reported by Kernel Concurrency Sanitizer on: [ 50.752825][ T1639] CPU: 1 PID: 1639 Comm: khugepaged Not tainted 5.12.0-rc4-syzkaller #0 [ 50.761128][ T1639] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.771154][ T1639] 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