[ 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 '10.128.10.26' (ECDSA) to the list of known hosts. 2020/06/17 11:39:41 fuzzer started 2020/06/17 11:39:41 dialing manager at 10.128.0.105:40489 2020/06/17 11:39:42 syscalls: 3085 2020/06/17 11:39:42 code coverage: enabled 2020/06/17 11:39:42 comparison tracing: enabled 2020/06/17 11:39:42 extra coverage: enabled 2020/06/17 11:39:42 setuid sandbox: enabled 2020/06/17 11:39:42 namespace sandbox: enabled 2020/06/17 11:39:42 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/17 11:39:42 fault injection: enabled 2020/06/17 11:39:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/17 11:39:42 net packet injection: enabled 2020/06/17 11:39:42 net device setup: enabled 2020/06/17 11:39:42 concurrency sanitizer: enabled 2020/06/17 11:39:42 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/17 11:39:42 USB emulation: enabled 2020/06/17 11:39:44 suppressing KCSAN reports in functions: 'complete_signal' 'ext4_free_inodes_count' 'generic_write_end' 'do_nanosleep' 'copy_process' 'ep_poll' 'ext4_sync_file' 'mod_timer' 'find_get_pages_range_tag' 'tick_sched_do_timer' '__ext4_new_inode' 'do_signal_stop' 'generic_fillattr' 'file_update_time' 'alloc_pid' 'dd_has_work' '__writeback_single_inode' 'page_counter_charge' 'shmem_file_read_iter' 'run_timer_softirq' syzkaller login: [ 52.521901][ T8911] ================================================================== [ 52.530406][ T8911] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 52.538674][ T8911] [ 52.542043][ T8911] write to 0xffff88812b13e024 of 4 bytes by task 8912 on cpu 1: [ 52.549669][ T8911] futex_wait_queue_me+0x17d/0x290 [ 52.555393][ T8911] futex_wait+0x17e/0x3a0 [ 52.559969][ T8911] do_futex+0xe2/0x15b0 [ 52.564108][ T8911] __x64_sys_futex+0x2dc/0x410 [ 52.568986][ T8911] do_syscall_64+0xc7/0x3b0 [ 52.573647][ T8911] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.579640][ T8911] [ 52.582902][ T8911] read to 0xffff88812b13e024 of 4 bytes by task 8911 on cpu 0: [ 52.590446][ T8911] prepare_signal+0x1f0/0x770 [ 52.595328][ T8911] __send_signal+0x95/0x8a0 [ 52.599831][ T8911] send_signal+0x211/0x2a0 [ 52.604898][ T8911] do_send_sig_info+0x59/0xc0 [ 52.609569][ T8911] do_send_specific+0xd8/0x100 [ 52.614346][ T8911] do_tkill+0xf8/0x130 [ 52.618393][ T8911] __x64_sys_tgkill+0x6d/0x90 [ 52.623072][ T8911] do_syscall_64+0xc7/0x3b0 [ 52.628081][ T8911] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.634295][ T8911] [ 52.655036][ T8911] Reported by Kernel Concurrency Sanitizer on: [ 52.661190][ T8911] CPU: 0 PID: 8911 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.681473][ T8911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.700998][ T8911] ================================================================== [ 52.709151][ T8911] Kernel panic - not syncing: panic_on_warn set ... [ 52.715725][ T8911] CPU: 0 PID: 8911 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.741269][ T8911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.756369][ T8911] Call Trace: [ 52.759742][ T8911] dump_stack+0x11d/0x187 [ 52.764066][ T8911] panic+0x210/0x640 [ 52.768052][ T8911] ? vprintk_func+0x89/0x13a [ 52.772882][ T8911] kcsan_report.cold+0xc/0x1a [ 52.778263][ T8911] kcsan_setup_watchpoint+0x3fb/0x440 [ 52.783681][ T8911] prepare_signal+0x1f0/0x770 [ 52.788344][ T8911] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 52.794459][ T8911] __send_signal+0x95/0x8a0 [ 52.798947][ T8911] send_signal+0x211/0x2a0 [ 52.803711][ T8911] do_send_sig_info+0x59/0xc0 [ 52.811906][ T8911] do_send_specific+0xd8/0x100 [ 52.818913][ T8911] do_tkill+0xf8/0x130 [ 52.823052][ T8911] __x64_sys_tgkill+0x6d/0x90 [ 52.827843][ T8911] do_syscall_64+0xc7/0x3b0 [ 52.832804][ T8911] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.839768][ T8911] RIP: 0033:0x468b26 [ 52.843948][ T8911] Code: cc cc cc cc b8 27 00 00 00 0f 05 48 89 44 24 08 c3 cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 48 8b 54 24 18 b8 ea 00 00 00 0f 05 cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 48 8b 54 [ 52.864400][ T8911] RSP: 002b:000000c00008deb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 52.872946][ T8911] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 52.881193][ T8911] RDX: 0000000000000017 RSI: 00000000000022d0 RDI: 00000000000022ca [ 52.889516][ T8911] RBP: 000000c00008ded0 R08: 0000000000000000 R09: 0000000000000000 [ 52.897635][ T8911] R10: 000000c00008dec0 R11: 0000000000000246 R12: 0000000000000057 [ 52.905629][ T8911] R13: 0000000000e5e300 R14: 0000000000000000 R15: 0000000000000000 [ 52.915659][ T8911] Kernel Offset: disabled [ 52.919987][ T8911] Rebooting in 86400 seconds..