[ 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 '10.128.1.30' (ECDSA) to the list of known hosts. 2020/06/12 16:31:17 fuzzer started 2020/06/12 16:31:17 dialing manager at 10.128.0.105:35517 2020/06/12 16:31:18 syscalls: 3085 2020/06/12 16:31:18 code coverage: enabled 2020/06/12 16:31:18 comparison tracing: enabled 2020/06/12 16:31:18 extra coverage: enabled 2020/06/12 16:31:18 setuid sandbox: enabled 2020/06/12 16:31:18 namespace sandbox: enabled 2020/06/12 16:31:18 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/12 16:31:18 fault injection: enabled 2020/06/12 16:31:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/12 16:31:18 net packet injection: enabled 2020/06/12 16:31:18 net device setup: enabled 2020/06/12 16:31:18 concurrency sanitizer: enabled 2020/06/12 16:31:18 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/12 16:31:18 USB emulation: enabled syzkaller login: [ 49.438465][ T8919] KCSAN: could not find function: '_find_next_bit' 2020/06/12 16:31:19 adding functions to KCSAN blacklist: 'do_signal_stop' '_find_next_bit' 'xas_clear_mark' 'mod_timer' '__ext4_new_inode' 'ep_poll' 'find_get_pages_range_tag' 'file_update_time' 'generic_write_end' 'tick_sched_do_timer' 'copy_process' 'alloc_pid' [ 52.962298][ T8910] ================================================================== [ 52.970506][ T8910] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 52.978188][ T8910] [ 52.980493][ T8910] write to 0xffff8881269e50a4 of 4 bytes by task 8908 on cpu 0: [ 52.988098][ T8910] futex_wait_queue_me+0x17d/0x290 [ 52.993184][ T8910] futex_wait+0x17e/0x3a0 [ 52.997497][ T8910] do_futex+0xe2/0x15b0 [ 53.001644][ T8910] __x64_sys_futex+0x2dc/0x410 [ 53.006437][ T8910] do_syscall_64+0xc7/0x3b0 [ 53.011096][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.017076][ T8910] [ 53.019386][ T8910] read to 0xffff8881269e50a4 of 4 bytes by task 8910 on cpu 1: [ 53.027094][ T8910] __send_signal+0x468/0x8a0 [ 53.031678][ T8910] send_signal+0x211/0x2a0 [ 53.036122][ T8910] do_send_sig_info+0x59/0xc0 [ 53.041555][ T8910] do_send_specific+0xd8/0x100 [ 53.046294][ T8910] do_tkill+0xf8/0x130 [ 53.050339][ T8910] __x64_sys_tgkill+0x6d/0x90 [ 53.054992][ T8910] do_syscall_64+0xc7/0x3b0 [ 53.059487][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.065346][ T8910] [ 53.067681][ T8910] Reported by Kernel Concurrency Sanitizer on: [ 53.073903][ T8910] CPU: 1 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.082282][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.092310][ T8910] ================================================================== [ 53.100566][ T8910] Kernel panic - not syncing: panic_on_warn set ... [ 53.107141][ T8910] CPU: 1 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.115349][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.125375][ T8910] Call Trace: [ 53.128647][ T8910] dump_stack+0x11d/0x187 [ 53.132953][ T8910] panic+0x210/0x640 [ 53.136826][ T8910] ? vprintk_func+0x89/0x13a [ 53.141414][ T8910] kcsan_report.cold+0xc/0x1a [ 53.146087][ T8910] kcsan_setup_watchpoint+0x3fb/0x440 [ 53.151453][ T8910] __send_signal+0x468/0x8a0 [ 53.156033][ T8910] send_signal+0x211/0x2a0 [ 53.160441][ T8910] do_send_sig_info+0x59/0xc0 [ 53.165119][ T8910] do_send_specific+0xd8/0x100 [ 53.169870][ T8910] do_tkill+0xf8/0x130 [ 53.173927][ T8910] __x64_sys_tgkill+0x6d/0x90 [ 53.178598][ T8910] do_syscall_64+0xc7/0x3b0 [ 53.183082][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.188961][ T8910] RIP: 0033:0x468b26 [ 53.192835][ T8910] 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 [ 53.212422][ T8910] RSP: 002b:000000c0000f3eb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 53.220812][ T8910] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 53.228759][ T8910] RDX: 0000000000000017 RSI: 00000000000022cc RDI: 00000000000022c9 [ 53.236705][ T8910] RBP: 000000c0000f3ed0 R08: 0000000000000000 R09: 0000000000000034 [ 53.244654][ T8910] R10: 00007f372f155968 R11: 0000000000000246 R12: 00000000010b9d80 [ 53.253556][ T8910] R13: 0000000000e5e200 R14: 0000000000000000 R15: 0000000000000000 [ 54.337142][ T8910] Shutting down cpus with NMI [ 54.342987][ T8910] Kernel Offset: disabled [ 54.347315][ T8910] Rebooting in 86400 seconds..