[ 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 '10.128.1.20' (ECDSA) to the list of known hosts. 2020/06/19 03:27:02 fuzzer started 2020/06/19 03:27:02 dialing manager at 10.128.0.105:42677 2020/06/19 03:27:02 syscalls: 3092 2020/06/19 03:27:02 code coverage: enabled 2020/06/19 03:27:02 comparison tracing: enabled 2020/06/19 03:27:02 extra coverage: enabled 2020/06/19 03:27:02 setuid sandbox: enabled 2020/06/19 03:27:02 namespace sandbox: enabled 2020/06/19 03:27:02 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/19 03:27:02 fault injection: enabled 2020/06/19 03:27:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/19 03:27:02 net packet injection: enabled 2020/06/19 03:27:02 net device setup: enabled 2020/06/19 03:27:02 concurrency sanitizer: enabled 2020/06/19 03:27:02 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/19 03:27:02 USB emulation: enabled 2020/06/19 03:27:05 suppressing KCSAN reports in functions: 'shmem_file_read_iter' 'do_nanosleep' 'ext4_mark_iloc_dirty' '__delayacct_blkio_end' 'ext4_free_inode' 'blk_mq_dispatch_rq_list' '__mod_timer' '__xa_clear_mark' 'do_epoll_wait' 'page_counter_charge' 'dd_has_work' 'xas_clear_mark' 'blk_mq_rq_ctx_init' 'copy_process' 'kvm_mmu_notifier_invalidate_range_end' 'af_alg_sendpage' 'binder_state_show' 'generic_write_end' 'io_sq_thread' 'kauditd_thread' 'n_tty_receive_buf_common' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' 'find_get_pages_range_tag' 'do_signal_stop' '__writeback_single_inode' '__send_signal' 'pcpu_alloc' 'ext4_free_inodes_count' 'exit_mm' 'do_syslog' 'do_select' syzkaller login: [ 49.387635][ T8630] ================================================================== [ 49.395851][ T8630] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 49.403547][ T8630] [ 49.405849][ T8630] write to 0xffff888120e61024 of 4 bytes by task 8629 on cpu 1: [ 49.413463][ T8630] futex_wait_queue_me+0x186/0x250 [ 49.419100][ T8630] futex_wait+0x153/0x3a0 [ 49.423397][ T8630] do_futex+0x144a/0x21b0 [ 49.427696][ T8630] __se_sys_futex+0x26d/0x330 [ 49.432358][ T8630] __x64_sys_futex+0x74/0x80 [ 49.436919][ T8630] do_syscall_64+0x71/0x120 [ 49.441395][ T8630] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.447251][ T8630] [ 49.449554][ T8630] read to 0xffff888120e61024 of 4 bytes by task 8630 on cpu 0: [ 49.457071][ T8630] complete_signal+0x7c/0x5f0 [ 49.461718][ T8630] __send_signal+0x680/0x7d0 [ 49.466278][ T8630] send_signal+0x398/0x3e0 [ 49.470676][ T8630] do_send_sig_info+0x9b/0xe0 [ 49.475320][ T8630] do_send_specific+0xc7/0x100 [ 49.480053][ T8630] __x64_sys_tgkill+0x108/0x140 [ 49.484871][ T8630] do_syscall_64+0x71/0x120 [ 49.489346][ T8630] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.495203][ T8630] [ 49.497518][ T8630] Reported by Kernel Concurrency Sanitizer on: [ 49.503640][ T8630] CPU: 0 PID: 8630 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 49.511843][ T8630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.522402][ T8630] ================================================================== [ 49.530495][ T8630] Kernel panic - not syncing: panic_on_warn set ... [ 49.537075][ T8630] CPU: 0 PID: 8630 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 49.545281][ T8630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.555306][ T8630] Call Trace: [ 49.558573][ T8630] dump_stack+0x10f/0x19d [ 49.562888][ T8630] panic+0x1f8/0x63a [ 49.566774][ T8630] ? vprintk_emit+0x44a/0x4f0 [ 49.571429][ T8630] kcsan_report+0x684/0x690 [ 49.575903][ T8630] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 49.581416][ T8630] ? complete_signal+0x7c/0x5f0 [ 49.586236][ T8630] ? __send_signal+0x680/0x7d0 [ 49.590972][ T8630] ? send_signal+0x398/0x3e0 [ 49.595580][ T8630] ? do_send_sig_info+0x9b/0xe0 [ 49.600423][ T8630] ? do_send_specific+0xc7/0x100 [ 49.605329][ T8630] ? __x64_sys_tgkill+0x108/0x140 [ 49.610323][ T8630] ? do_syscall_64+0x71/0x120 [ 49.614968][ T8630] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.621010][ T8630] ? line6_data_received+0x76/0x250 [ 49.626179][ T8630] ? check_preemption_disabled+0x3f/0x1a0 [ 49.631869][ T8630] kcsan_setup_watchpoint+0x453/0x4d0 [ 49.637311][ T8630] complete_signal+0x7c/0x5f0 [ 49.641957][ T8630] __send_signal+0x680/0x7d0 [ 49.646533][ T8630] send_signal+0x398/0x3e0 [ 49.650918][ T8630] do_send_sig_info+0x9b/0xe0 [ 49.655572][ T8630] do_send_specific+0xc7/0x100 [ 49.660309][ T8630] __x64_sys_tgkill+0x108/0x140 [ 49.665148][ T8630] do_syscall_64+0x71/0x120 [ 49.669640][ T8630] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.675501][ T8630] RIP: 0033:0x468b26 [ 49.679376][ T8630] Code: Bad RIP value. [ 49.683409][ T8630] RSP: 002b:000000c0000c7eb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 49.691841][ T8630] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 49.699786][ T8630] RDX: 0000000000000017 RSI: 00000000000021b5 RDI: 00000000000021b2 [ 49.707742][ T8630] RBP: 000000c0000c7ed0 R08: 0000000000000000 R09: 0000000000000000 [ 49.715701][ T8630] R10: 000000c0000c7ec0 R11: 0000000000000246 R12: 0000000000000000 [ 49.723651][ T8630] R13: 000000c000001500 R14: 0000000000000004 R15: 0000000000000880 [ 49.732306][ T8630] Kernel Offset: disabled [ 49.736618][ T8630] Rebooting in 86400 seconds..