[ 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 '10.128.0.254' (ECDSA) to the list of known hosts. 2020/06/02 12:36:02 fuzzer started 2020/06/02 12:36:03 dialing manager at 10.128.0.105:37135 2020/06/02 12:36:04 syscalls: 3055 2020/06/02 12:36:04 code coverage: enabled 2020/06/02 12:36:04 comparison tracing: enabled 2020/06/02 12:36:04 extra coverage: enabled 2020/06/02 12:36:04 setuid sandbox: enabled 2020/06/02 12:36:04 namespace sandbox: enabled 2020/06/02 12:36:04 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/02 12:36:04 fault injection: enabled 2020/06/02 12:36:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/02 12:36:04 net packet injection: enabled 2020/06/02 12:36:04 net device setup: enabled 2020/06/02 12:36:04 concurrency sanitizer: enabled 2020/06/02 12:36:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/02 12:36:04 USB emulation: enabled syzkaller login: [ 51.090610][ T8907] KCSAN: could not find function: '_find_next_bit' 2020/06/02 12:36:05 adding functions to KCSAN blacklist: 'ep_poll' '__ext4_new_inode' 'run_timer_softirq' 'copy_process' 'find_get_pages_range_tag' '_find_next_bit' 'mod_timer' 'generic_write_end' 'do_nanosleep' [ 52.135669][ T8893] ================================================================== [ 52.144000][ T8893] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 52.151512][ T8893] [ 52.153823][ T8893] write to 0xffff888126907024 of 4 bytes by task 8908 on cpu 0: [ 52.161480][ T8893] futex_wait_queue_me+0x17d/0x290 [ 52.166569][ T8893] futex_wait+0x17e/0x3a0 [ 52.171307][ T8893] do_futex+0xe2/0x15b0 [ 52.175442][ T8893] __x64_sys_futex+0x2dc/0x410 [ 52.180194][ T8893] do_syscall_64+0xc7/0x3b0 [ 52.184673][ T8893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.190573][ T8893] [ 52.192880][ T8893] read to 0xffff888126907024 of 4 bytes by task 8893 on cpu 1: [ 52.200397][ T8893] __send_signal+0x468/0x8a0 [ 52.204964][ T8893] send_signal+0x211/0x2a0 [ 52.209354][ T8893] do_send_sig_info+0x59/0xc0 [ 52.214117][ T8893] do_send_specific+0xd8/0x100 [ 52.218855][ T8893] do_tkill+0xf8/0x130 [ 52.222907][ T8893] __x64_sys_tgkill+0x6d/0x90 [ 52.227562][ T8893] do_syscall_64+0xc7/0x3b0 [ 52.232041][ T8893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.237902][ T8893] [ 52.240201][ T8893] Reported by Kernel Concurrency Sanitizer on: [ 52.246377][ T8893] CPU: 1 PID: 8893 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.254783][ T8893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.264822][ T8893] ================================================================== [ 52.272854][ T8893] Kernel panic - not syncing: panic_on_warn set ... [ 52.279426][ T8893] CPU: 1 PID: 8893 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.287632][ T8893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.297658][ T8893] Call Trace: [ 52.300930][ T8893] dump_stack+0x11d/0x187 [ 52.305237][ T8893] panic+0x210/0x640 [ 52.309108][ T8893] ? vprintk_func+0x89/0x13a [ 52.313675][ T8893] kcsan_report.cold+0xc/0x1a [ 52.318333][ T8893] kcsan_setup_watchpoint+0x3fb/0x440 [ 52.323689][ T8893] __send_signal+0x468/0x8a0 [ 52.328271][ T8893] send_signal+0x211/0x2a0 [ 52.332677][ T8893] do_send_sig_info+0x59/0xc0 [ 52.337331][ T8893] do_send_specific+0xd8/0x100 [ 52.342071][ T8893] do_tkill+0xf8/0x130 [ 52.346120][ T8893] __x64_sys_tgkill+0x6d/0x90 [ 52.350785][ T8893] do_syscall_64+0xc7/0x3b0 [ 52.355266][ T8893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.361143][ T8893] RIP: 0033:0x468b26 [ 52.365019][ T8893] 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 [ 52.384596][ T8893] RSP: 002b:00007ffd80eae060 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 52.392990][ T8893] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 52.400974][ T8893] RDX: 0000000000000017 RSI: 00000000000022cc RDI: 00000000000022bd [ 52.408920][ T8893] RBP: 00007ffd80eae080 R08: 0000000000000000 R09: 0000000000000000 [ 52.416881][ T8893] R10: 00007ffd80eae070 R11: 0000000000000246 R12: 0000000000000011 [ 52.424831][ T8893] R13: 0000000000e52de0 R14: 0000000000000000 R15: 0000000000000000 [ 52.434062][ T8893] Kernel Offset: disabled [ 52.438374][ T8893] Rebooting in 86400 seconds..