[ 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 '10.128.10.13' (ECDSA) to the list of known hosts. 2020/06/13 23:14:13 fuzzer started 2020/06/13 23:14:13 dialing manager at 10.128.0.105:38693 2020/06/13 23:14:13 syscalls: 3085 2020/06/13 23:14:13 code coverage: enabled 2020/06/13 23:14:13 comparison tracing: enabled 2020/06/13 23:14:13 extra coverage: enabled 2020/06/13 23:14:13 setuid sandbox: enabled 2020/06/13 23:14:13 namespace sandbox: enabled 2020/06/13 23:14:13 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/13 23:14:13 fault injection: enabled 2020/06/13 23:14:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/13 23:14:13 net packet injection: enabled 2020/06/13 23:14:13 net device setup: enabled 2020/06/13 23:14:13 concurrency sanitizer: enabled 2020/06/13 23:14:13 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/13 23:14:13 USB emulation: enabled 2020/06/13 23:14:14 adding functions to KCSAN blacklist: 'filemap_map_pages' 'copy_process' 'alloc_pid' 'ep_poll' '__ext4_new_inode' syzkaller login: [ 54.825189][ T8908] ================================================================== [ 54.833412][ T8908] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 54.840972][ T8908] [ 54.843279][ T8908] write to 0xffff888126a74064 of 4 bytes by task 8911 on cpu 1: [ 54.850968][ T8908] futex_wait_queue_me+0x17d/0x290 [ 54.856064][ T8908] futex_wait+0x17e/0x3a0 [ 54.860406][ T8908] do_futex+0xe2/0x15b0 [ 54.864533][ T8908] __x64_sys_futex+0x2dc/0x410 [ 54.869271][ T8908] do_syscall_64+0xc7/0x3b0 [ 54.873763][ T8908] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.879620][ T8908] [ 54.881926][ T8908] read to 0xffff888126a74064 of 4 bytes by task 8908 on cpu 0: [ 54.889442][ T8908] __send_signal+0x468/0x8a0 [ 54.894014][ T8908] send_signal+0x211/0x2a0 [ 54.898419][ T8908] do_send_sig_info+0x59/0xc0 [ 54.903068][ T8908] do_send_specific+0xd8/0x100 [ 54.907892][ T8908] do_tkill+0xf8/0x130 [ 54.911935][ T8908] __x64_sys_tgkill+0x6d/0x90 [ 54.916601][ T8908] do_syscall_64+0xc7/0x3b0 [ 54.921165][ T8908] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.927047][ T8908] [ 54.929361][ T8908] Reported by Kernel Concurrency Sanitizer on: [ 54.935487][ T8908] CPU: 0 PID: 8908 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 54.943691][ T8908] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.953718][ T8908] ================================================================== [ 54.961762][ T8908] Kernel panic - not syncing: panic_on_warn set ... [ 54.968323][ T8908] CPU: 0 PID: 8908 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 54.976582][ T8908] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.986632][ T8908] Call Trace: [ 54.989920][ T8908] dump_stack+0x11d/0x187 [ 54.994230][ T8908] panic+0x210/0x640 [ 54.998105][ T8908] ? vprintk_func+0x89/0x13a [ 55.002687][ T8908] kcsan_report.cold+0xc/0x1a [ 55.007521][ T8908] kcsan_setup_watchpoint+0x3fb/0x440 [ 55.012874][ T8908] __send_signal+0x468/0x8a0 [ 55.017462][ T8908] send_signal+0x211/0x2a0 [ 55.021869][ T8908] do_send_sig_info+0x59/0xc0 [ 55.026537][ T8908] do_send_specific+0xd8/0x100 [ 55.031280][ T8908] do_tkill+0xf8/0x130 [ 55.035326][ T8908] __x64_sys_tgkill+0x6d/0x90 [ 55.039994][ T8908] do_syscall_64+0xc7/0x3b0 [ 55.044487][ T8908] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.050351][ T8908] RIP: 0033:0x468b26 [ 55.054241][ T8908] 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 [ 55.073839][ T8908] RSP: 002b:000000c00004feb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 55.082252][ T8908] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 55.090209][ T8908] RDX: 0000000000000017 RSI: 00000000000022cf RDI: 00000000000022ca [ 55.098155][ T8908] RBP: 000000c00004fed0 R08: 0000000000000000 R09: 0000000000000036 [ 55.106102][ T8908] R10: 00007f70d1b37968 R11: 0000000000000246 R12: 0000000000000032 [ 55.114062][ T8908] R13: 000000c000000900 R14: 0000000000000000 R15: 0000000000000000 [ 56.198632][ T8908] Shutting down cpus with NMI [ 56.204652][ T8908] Kernel Offset: disabled [ 56.208967][ T8908] Rebooting in 86400 seconds..