[ 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: [ 40.274920][ T8700] bash (8700) used greatest stack depth: 10440 bytes left Warning: Permanently added '10.128.0.239' (ECDSA) to the list of known hosts. 2020/06/15 08:25:40 fuzzer started 2020/06/15 08:25:40 dialing manager at 10.128.0.105:32959 2020/06/15 08:25:40 syscalls: 3085 2020/06/15 08:25:40 code coverage: enabled 2020/06/15 08:25:40 comparison tracing: enabled 2020/06/15 08:25:40 extra coverage: enabled 2020/06/15 08:25:40 setuid sandbox: enabled 2020/06/15 08:25:40 namespace sandbox: enabled 2020/06/15 08:25:40 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/15 08:25:40 fault injection: enabled 2020/06/15 08:25:40 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/15 08:25:40 net packet injection: enabled 2020/06/15 08:25:40 net device setup: enabled 2020/06/15 08:25:40 concurrency sanitizer: enabled 2020/06/15 08:25:40 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/15 08:25:40 USB emulation: enabled [ 50.533157][ T8923] KCSAN: could not find function: '_find_next_bit' 2020/06/15 08:25:42 suppressing KCSAN reports in functions: 'tick_nohz_idle_stop_tick' 'run_timer_softirq' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' 'alloc_pid' 'ep_poll' '_find_next_bit' 'generic_file_read_iter' '__ext4_new_inode' '__mpage_writepage' [ 56.040917][ T8924] ================================================================== [ 56.049070][ T8924] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 56.056756][ T8924] [ 56.059070][ T8924] write to 0xffff8881251e0024 of 4 bytes by task 8914 on cpu 1: [ 56.066676][ T8924] futex_wait_queue_me+0x17d/0x290 [ 56.071766][ T8924] futex_wait+0x17e/0x3a0 [ 56.076190][ T8924] do_futex+0xe2/0x15b0 [ 56.080334][ T8924] __x64_sys_futex+0x2dc/0x410 [ 56.085128][ T8924] do_syscall_64+0xc7/0x3b0 [ 56.089635][ T8924] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.095503][ T8924] [ 56.097813][ T8924] read to 0xffff8881251e0024 of 4 bytes by task 8924 on cpu 0: [ 56.105348][ T8924] complete_signal+0x85/0x5c0 [ 56.110134][ T8924] __send_signal+0x675/0x8a0 [ 56.114829][ T8924] send_signal+0x211/0x2a0 [ 56.119247][ T8924] do_send_sig_info+0x59/0xc0 [ 56.123903][ T8924] do_send_specific+0xd8/0x100 [ 56.128656][ T8924] do_tkill+0xf8/0x130 [ 56.132712][ T8924] __x64_sys_tgkill+0x6d/0x90 [ 56.137368][ T8924] do_syscall_64+0xc7/0x3b0 [ 56.142295][ T8924] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.148282][ T8924] [ 56.150599][ T8924] Reported by Kernel Concurrency Sanitizer on: [ 56.156770][ T8924] CPU: 0 PID: 8924 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.165128][ T8924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.175300][ T8924] ================================================================== [ 56.183376][ T8924] Kernel panic - not syncing: panic_on_warn set ... [ 56.190009][ T8924] CPU: 0 PID: 8924 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.198402][ T8924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.209107][ T8924] Call Trace: [ 56.212393][ T8924] dump_stack+0x11d/0x187 [ 56.216729][ T8924] panic+0x210/0x640 [ 56.220652][ T8924] ? vprintk_func+0x89/0x13a [ 56.225220][ T8924] kcsan_report.cold+0xc/0x1a [ 56.229895][ T8924] kcsan_setup_watchpoint+0x3fb/0x440 [ 56.235270][ T8924] complete_signal+0x85/0x5c0 [ 56.240599][ T8924] ? __sigqueue_alloc+0x190/0x2c0 [ 56.246118][ T8924] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 56.252031][ T8924] __send_signal+0x675/0x8a0 [ 56.256635][ T8924] send_signal+0x211/0x2a0 [ 56.261032][ T8924] do_send_sig_info+0x59/0xc0 [ 56.265710][ T8924] do_send_specific+0xd8/0x100 [ 56.270789][ T8924] do_tkill+0xf8/0x130 [ 56.274942][ T8924] __x64_sys_tgkill+0x6d/0x90 [ 56.279690][ T8924] do_syscall_64+0xc7/0x3b0 [ 56.284267][ T8924] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.290261][ T8924] RIP: 0033:0x468b26 [ 56.294147][ T8924] 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 [ 56.314750][ T8924] RSP: 002b:000000c00038fed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 56.323883][ T8924] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 56.332533][ T8924] RDX: 0000000000000017 RSI: 00000000000022d2 RDI: 00000000000022cd [ 56.340524][ T8924] RBP: 000000c00038fef8 R08: 00007ffc977cd080 R09: 0000000000000038 [ 56.348510][ T8924] R10: 000000c00038fec0 R11: 0000000000000246 R12: 0000000000000055 [ 56.356468][ T8924] R13: 0000000000000021 R14: 0000000000000207 R15: ffffffffffffffff [ 56.366247][ T8924] Kernel Offset: disabled [ 56.370941][ T8924] Rebooting in 86400 seconds..