[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.40' (ECDSA) to the list of known hosts. 2020/06/06 13:40:36 fuzzer started 2020/06/06 13:40:36 dialing manager at 10.128.0.105:33593 2020/06/06 13:40:39 syscalls: 3055 2020/06/06 13:40:39 code coverage: enabled 2020/06/06 13:40:39 comparison tracing: enabled 2020/06/06 13:40:39 extra coverage: enabled 2020/06/06 13:40:39 setuid sandbox: enabled 2020/06/06 13:40:39 namespace sandbox: enabled 2020/06/06 13:40:39 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/06 13:40:39 fault injection: enabled 2020/06/06 13:40:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/06 13:40:39 net packet injection: enabled 2020/06/06 13:40:39 net device setup: enabled 2020/06/06 13:40:39 concurrency sanitizer: enabled 2020/06/06 13:40:39 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/06 13:40:39 USB emulation: enabled syzkaller login: [ 56.599180][ T8943] KCSAN: could not find function: '_find_next_bit' 2020/06/06 13:40:42 adding functions to KCSAN blacklist: 'run_timer_softirq' 'tick_nohz_idle_stop_tick' 'blk_mq_sched_dispatch_requests' 'do_syslog' 'ep_poll' 'blk_mq_dispatch_rq_list' 'generic_write_end' 'dd_has_work' 'do_nanosleep' '_find_next_bit' 'blk_mq_get_request' 'page_counter_charge' '__ext4_new_inode' 'find_get_pages_range_tag' 'alloc_pid' 'copy_process' 'af_alg_sendpage' [ 77.884227][ T8932] ================================================================== [ 77.892326][ T8932] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 77.899859][ T8932] [ 77.902172][ T8932] write to 0xffff888125497024 of 4 bytes by task 8944 on cpu 1: [ 77.909774][ T8932] futex_wait_queue_me+0x17d/0x290 [ 77.914855][ T8932] futex_wait+0x17e/0x3a0 [ 77.919172][ T8932] do_futex+0xe2/0x15b0 [ 77.923303][ T8932] __x64_sys_futex+0x2dc/0x410 [ 77.928044][ T8932] do_syscall_64+0xc7/0x3b0 [ 77.932523][ T8932] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.938382][ T8932] [ 77.940688][ T8932] read to 0xffff888125497024 of 4 bytes by task 8932 on cpu 0: [ 77.948202][ T8932] __send_signal+0x468/0x8a0 [ 77.952765][ T8932] send_signal+0x211/0x2a0 [ 77.957170][ T8932] do_send_sig_info+0x59/0xc0 [ 77.961818][ T8932] do_send_specific+0xd8/0x100 [ 77.966555][ T8932] do_tkill+0xf8/0x130 [ 77.970600][ T8932] __x64_sys_tgkill+0x6d/0x90 [ 77.975252][ T8932] do_syscall_64+0xc7/0x3b0 [ 77.979729][ T8932] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.985601][ T8932] [ 77.987914][ T8932] Reported by Kernel Concurrency Sanitizer on: [ 77.994044][ T8932] CPU: 0 PID: 8932 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 78.002250][ T8932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.012293][ T8932] ================================================================== [ 78.020325][ T8932] Kernel panic - not syncing: panic_on_warn set ... [ 78.026955][ T8932] CPU: 0 PID: 8932 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 78.035167][ T8932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.045215][ T8932] Call Trace: [ 78.048489][ T8932] dump_stack+0x11d/0x187 [ 78.052798][ T8932] panic+0x210/0x640 [ 78.056676][ T8932] ? vprintk_func+0x89/0x13a [ 78.061242][ T8932] kcsan_report.cold+0xc/0x1a [ 78.065916][ T8932] kcsan_setup_watchpoint+0x3fb/0x440 [ 78.071265][ T8932] __send_signal+0x468/0x8a0 [ 78.075843][ T8932] send_signal+0x211/0x2a0 [ 78.080238][ T8932] do_send_sig_info+0x59/0xc0 [ 78.084892][ T8932] do_send_specific+0xd8/0x100 [ 78.089632][ T8932] do_tkill+0xf8/0x130 [ 78.093697][ T8932] __x64_sys_tgkill+0x6d/0x90 [ 78.098368][ T8932] do_syscall_64+0xc7/0x3b0 [ 78.102849][ T8932] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 78.108729][ T8932] RIP: 0033:0x468b26 [ 78.112605][ T8932] 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 [ 78.132184][ T8932] RSP: 002b:000000c000049eb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 78.140567][ T8932] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 78.148533][ T8932] RDX: 0000000000000017 RSI: 00000000000022f0 RDI: 00000000000022e1 [ 78.156493][ T8932] RBP: 000000c000049ed0 R08: 0000000000000000 R09: 000000000000004d [ 78.164442][ T8932] R10: 00007fcb27699968 R11: 0000000000000246 R12: 000000000108f020 [ 78.172398][ T8932] R13: 000000c00000c2e0 R14: 0000000000000004 R15: 0000000000000000 [ 79.256325][ T8932] Shutting down cpus with NMI [ 79.262225][ T8932] Kernel Offset: disabled [ 79.266589][ T8932] Rebooting in 86400 seconds..