[ 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 '10.128.0.159' (ECDSA) to the list of known hosts. 2020/06/19 03:25:46 fuzzer started 2020/06/19 03:25:47 dialing manager at 10.128.0.105:42677 2020/06/19 03:25:47 syscalls: 3092 2020/06/19 03:25:47 code coverage: enabled 2020/06/19 03:25:47 comparison tracing: enabled 2020/06/19 03:25:47 extra coverage: enabled 2020/06/19 03:25:47 setuid sandbox: enabled 2020/06/19 03:25:47 namespace sandbox: enabled 2020/06/19 03:25:47 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/19 03:25:47 fault injection: enabled 2020/06/19 03:25:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/19 03:25:47 net packet injection: enabled 2020/06/19 03:25:47 net device setup: enabled 2020/06/19 03:25:47 concurrency sanitizer: enabled 2020/06/19 03:25:47 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/19 03:25:47 USB emulation: enabled 2020/06/19 03:25:49 suppressing KCSAN reports in functions: 'pcpu_alloc' 'ext4_free_inodes_count' 'exit_mm' 'do_syslog' '__writeback_single_inode' 'do_select' 'ext4_mark_iloc_dirty' '__delayacct_blkio_end' 'ext4_free_inode' 'blk_mq_dispatch_rq_list' 'shmem_file_read_iter' 'do_nanosleep' '__xa_clear_mark' 'do_epoll_wait' 'page_counter_charge' 'dd_has_work' '__mod_timer' 'blk_mq_rq_ctx_init' 'copy_process' 'kvm_mmu_notifier_invalidate_range_end' 'af_alg_sendpage' 'xas_clear_mark' 'generic_write_end' 'io_sq_thread' 'kauditd_thread' 'n_tty_receive_buf_common' 'binder_state_show' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' 'find_get_pages_range_tag' 'do_signal_stop' syzkaller login: [ 57.404893][ T8647] ================================================================== [ 57.413100][ T8647] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 57.420657][ T8647] [ 57.422967][ T8647] write to 0xffff88812166f064 of 4 bytes by task 8657 on cpu 0: [ 57.430589][ T8647] futex_wait_queue_me+0x186/0x250 [ 57.435694][ T8647] futex_wait+0x153/0x3a0 [ 57.440008][ T8647] do_futex+0x144a/0x21b0 [ 57.444321][ T8647] __se_sys_futex+0x26d/0x330 [ 57.448981][ T8647] __x64_sys_futex+0x74/0x80 [ 57.453543][ T8647] do_syscall_64+0x71/0x120 [ 57.458126][ T8647] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.464026][ T8647] [ 57.466340][ T8647] read to 0xffff88812166f064 of 4 bytes by task 8647 on cpu 1: [ 57.473868][ T8647] __send_signal+0x26d/0x7d0 [ 57.478599][ T8647] send_signal+0x398/0x3e0 [ 57.483160][ T8647] do_send_sig_info+0x9b/0xe0 [ 57.488072][ T8647] do_send_specific+0xc7/0x100 [ 57.492919][ T8647] __x64_sys_tgkill+0x108/0x140 [ 57.497762][ T8647] do_syscall_64+0x71/0x120 [ 57.502254][ T8647] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.508120][ T8647] [ 57.510469][ T8647] Reported by Kernel Concurrency Sanitizer on: [ 57.516657][ T8647] CPU: 1 PID: 8647 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 57.525429][ T8647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.535478][ T8647] ================================================================== [ 57.543603][ T8647] Kernel panic - not syncing: panic_on_warn set ... [ 57.550179][ T8647] CPU: 1 PID: 8647 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 57.558470][ T8647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.569814][ T8647] Call Trace: [ 57.573092][ T8647] dump_stack+0x10f/0x19d [ 57.577392][ T8647] panic+0x1f8/0x63a [ 57.581322][ T8647] ? vprintk_emit+0x44a/0x4f0 [ 57.586090][ T8647] kcsan_report+0x684/0x690 [ 57.590618][ T8647] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 57.596189][ T8647] ? __send_signal+0x26d/0x7d0 [ 57.600923][ T8647] ? send_signal+0x398/0x3e0 [ 57.605538][ T8647] ? do_send_sig_info+0x9b/0xe0 [ 57.610381][ T8647] ? do_send_specific+0xc7/0x100 [ 57.615316][ T8647] ? __x64_sys_tgkill+0x108/0x140 [ 57.620344][ T8647] ? do_syscall_64+0x71/0x120 [ 57.625115][ T8647] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.631174][ T8647] ? constant_test_bit+0x2a/0x30 [ 57.636103][ T8647] ? acpi_register_gsi_xen+0xf0/0x140 [ 57.641518][ T8647] ? check_preemption_disabled+0x3f/0x1a0 [ 57.647262][ T8647] kcsan_setup_watchpoint+0x453/0x4d0 [ 57.652615][ T8647] __send_signal+0x26d/0x7d0 [ 57.657203][ T8647] send_signal+0x398/0x3e0 [ 57.661652][ T8647] do_send_sig_info+0x9b/0xe0 [ 57.666336][ T8647] do_send_specific+0xc7/0x100 [ 57.671070][ T8647] __x64_sys_tgkill+0x108/0x140 [ 57.675892][ T8647] do_syscall_64+0x71/0x120 [ 57.680368][ T8647] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.686243][ T8647] RIP: 0033:0x468b26 [ 57.690120][ T8647] Code: Bad RIP value. [ 57.694169][ T8647] RSP: 002b:000000c000079eb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 57.702624][ T8647] RAX: ffffffffffffffda RBX: 000000c000001980 RCX: 0000000000468b26 [ 57.710599][ T8647] RDX: 0000000000000017 RSI: 00000000000021d1 RDI: 00000000000021c3 [ 57.719103][ T8647] RBP: 000000c000079ed0 R08: 0000000000000000 R09: 00007ffe4e3b3080 [ 57.727067][ T8647] R10: 0000000000000010 R11: 0000000000000246 R12: 000000c0007b55c0 [ 57.735031][ T8647] R13: 000000c000001200 R14: 0000000000000007 R15: 0000000000001b0d [ 57.743758][ T8647] Kernel Offset: disabled [ 57.748078][ T8647] Rebooting in 86400 seconds..