[ 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 syzkaller login: [ 24.560141][ T8203] sshd (8203) used greatest stack depth: 9440 bytes left Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. 2021/01/15 14:27:51 fuzzer started 2021/01/15 14:27:51 dialing manager at 10.128.0.105:41093 2021/01/15 14:27:51 syscalls: 3465 2021/01/15 14:27:51 code coverage: enabled 2021/01/15 14:27:51 comparison tracing: enabled 2021/01/15 14:27:51 extra coverage: enabled 2021/01/15 14:27:51 setuid sandbox: enabled 2021/01/15 14:27:51 namespace sandbox: enabled 2021/01/15 14:27:51 Android sandbox: /sys/fs/selinux/policy does not exist 2021/01/15 14:27:51 fault injection: enabled 2021/01/15 14:27:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/01/15 14:27:51 net packet injection: enabled 2021/01/15 14:27:51 net device setup: enabled 2021/01/15 14:27:51 concurrency sanitizer: enabled 2021/01/15 14:27:51 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/01/15 14:27:51 USB emulation: enabled 2021/01/15 14:27:51 hci packet injection: enabled 2021/01/15 14:27:51 wifi device emulation: enabled 2021/01/15 14:27:55 suppressing KCSAN reports in functions: 'do_sys_poll' 'blk_mq_do_dispatch_sched' '__mark_inode_dirty' '__xa_clear_mark' 'blk_mq_sched_dispatch_requests' 'wbt_issue' 'pcpu_alloc' 'vfs_readlink' 'shmem_mknod' 'generic_write_end' 'wbt_done' 'do_select' 'xas_find_marked' 'dd_has_work' 'ext4_set_iomap' 'expire_timers' '__io_cqring_fill_event' 'ext4_mb_regular_allocator' 'list_lru_add' 'iptunnel_xmit' 'blk_mq_rq_ctx_init' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' 'ext4_da_write_end' 'ext4_writepages' '__find_get_block' '__ext4_new_inode' 'ext4_mb_good_group' '__add_to_page_cache_locked' 'shmem_unlink' 'lru_add_drain_all' 'ext4_free_inode' '__blk_mq_sched_dispatch_requests' 'ext4_mark_iloc_dirty' 'do_signal_stop' '__writeback_single_inode' 'audit_log_start' 'caching_thread' 'exit_mm' 'filemap_map_pages' '__blkdev_put' 'kauditd_thread' 'tick_sched_timer' 'kvm_mmu_notifier_invalidate_range_end' '__process_echoes' 'tick_nohz_stop_tick' '__filemap_fdatawrite_range' 'futex_wait_queue_me' 'bpf_lru_pop_free' 'alloc_pid' 'n_tty_receive_buf_common' 'do_nanosleep' '__send_signal' 'generic_file_buffered_read' '__delete_from_page_cache' '__vfs_setxattr_noperm' 'ext4_free_inodes_count' '_prb_read_valid' 'lookup_fast' 2021/01/15 14:27:56 fetching corpus: 50, signal 18745/20701 (executing program) 2021/01/15 14:27:56 fetching corpus: 100, signal 32846/36729 (executing program) 2021/01/15 14:27:56 fetching corpus: 150, signal 42240/47977 (executing program) 2021/01/15 14:27:56 fetching corpus: 200, signal 50271/57843 (executing program) 2021/01/15 14:27:56 fetching corpus: 250, signal 55709/65108 (executing program) 2021/01/15 14:27:56 fetching corpus: 300, signal 62708/73880 (executing program) 2021/01/15 14:27:56 fetching corpus: 350, signal 73603/86486 (executing program) 2021/01/15 14:27:56 fetching corpus: 400, signal 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program) 2021/01/15 14:28:11 fetching corpus: 9350, signal 357797/576875 (executing program) 2021/01/15 14:28:11 fetching corpus: 9400, signal 358248/578350 (executing program) 2021/01/15 14:28:11 fetching corpus: 9450, signal 358741/579831 (executing program) [ 52.066909][ T8428] ================================================================== [ 52.075415][ T8428] BUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait [ 52.082725][ T8428] [ 52.085100][ T8428] write to 0xffff888108495958 of 8 bytes by task 8424 on cpu 0: [ 52.093001][ T8428] do_epoll_wait+0x4d3/0xf00 [ 52.097716][ T8428] __se_sys_epoll_pwait+0xfb/0x210 [ 52.102910][ T8428] __x64_sys_epoll_pwait+0x74/0x80 [ 52.108271][ T8428] do_syscall_64+0x39/0x80 [ 52.112743][ T8428] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.118658][ T8428] [ 52.120975][ T8428] read to 0xffff888108495958 of 8 bytes by task 8428 on cpu 1: [ 52.128510][ T8428] do_epoll_wait+0x292/0xf00 [ 52.133104][ T8428] __se_sys_epoll_pwait+0xfb/0x210 [ 52.138215][ T8428] __x64_sys_epoll_pwait+0x74/0x80 [ 52.143341][ T8428] do_syscall_64+0x39/0x80 [ 52.147777][ T8428] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.153681][ T8428] [ 52.156007][ T8428] Reported by Kernel Concurrency Sanitizer on: [ 52.162157][ T8428] CPU: 1 PID: 8428 Comm: syz-fuzzer Not tainted 5.11.0-rc3-syzkaller #0 [ 52.170485][ T8428] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.180577][ T8428] ================================================================== [ 52.188716][ T8428] Kernel panic - not syncing: panic_on_warn set ... [ 52.195350][ T8428] CPU: 1 PID: 8428 Comm: syz-fuzzer Not tainted 5.11.0-rc3-syzkaller #0 [ 52.203681][ T8428] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.213742][ T8428] Call Trace: [ 52.217028][ T8428] dump_stack+0x116/0x15d [ 52.221374][ T8428] panic+0x1e7/0x5fa [ 52.225284][ T8428] ? vprintk_emit+0x2e2/0x360 [ 52.229990][ T8428] kcsan_report+0x67b/0x680 [ 52.234512][ T8428] ? kcsan_setup_watchpoint+0x47b/0x4e0 [ 52.240079][ T8428] ? do_epoll_wait+0x292/0xf00 [ 52.244869][ T8428] ? __se_sys_epoll_pwait+0xfb/0x210 [ 52.250176][ T8428] ? __x64_sys_epoll_pwait+0x74/0x80 [ 52.255656][ T8428] ? do_syscall_64+0x39/0x80 [ 52.260269][ T8428] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.266414][ T8428] ? hdmi_chmap_ctl_tlv+0x490/0x520 [ 52.271763][ T8428] kcsan_setup_watchpoint+0x47b/0x4e0 [ 52.277186][ T8428] do_epoll_wait+0x292/0xf00 [ 52.281816][ T8428] ? vfs_read+0x3ce/0x5c0 [ 52.286174][ T8428] __se_sys_epoll_pwait+0xfb/0x210 [ 52.291330][ T8428] __x64_sys_epoll_pwait+0x74/0x80 [ 52.296535][ T8428] do_syscall_64+0x39/0x80 [ 52.301079][ T8428] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.307032][ T8428] RIP: 0033:0x466780 [ 52.310970][ T8428] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 52.330591][ T8428] RSP: 002b:000000c0002f58b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 52.339078][ T8428] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000466780 [ 52.347351][ T8428] RDX: 0000000000000080 RSI: 000000c0002f5900 RDI: 0000000000000003 [ 52.355416][ T8428] RBP: 000000c0002f5f00 R08: 0000000000000000 R09: 000000c003da01c0 [ 52.363420][ T8428] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000000fa [ 52.371495][ T8428] R13: 000000c000001500 R14: 0000000000000002 R15: 0000000000000002 [ 52.380051][ T8428] Kernel Offset: disabled [ 52.384375][ T8428] Rebooting in 86400 seconds..