[ 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 '10.128.0.91' (ECDSA) to the list of known hosts. 2020/06/08 10:48:35 fuzzer started 2020/06/08 10:48:36 dialing manager at 10.128.0.105:38613 2020/06/08 10:48:36 syscalls: 3055 2020/06/08 10:48:36 code coverage: enabled 2020/06/08 10:48:36 comparison tracing: enabled 2020/06/08 10:48:36 extra coverage: enabled 2020/06/08 10:48:36 setuid sandbox: enabled 2020/06/08 10:48:36 namespace sandbox: enabled 2020/06/08 10:48:36 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/08 10:48:36 fault injection: enabled 2020/06/08 10:48:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/08 10:48:36 net packet injection: enabled 2020/06/08 10:48:36 net device setup: enabled 2020/06/08 10:48:36 concurrency sanitizer: enabled 2020/06/08 10:48:36 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/08 10:48:36 USB emulation: enabled syzkaller login: [ 48.323381][ T8921] KCSAN: could not find function: '_find_next_bit' 2020/06/08 10:48:37 adding functions to KCSAN blacklist: 'tick_sched_do_timer' 'mod_timer' '_find_next_bit' 'copy_process' 'find_get_pages_range_tag' 'do_nanosleep' 'blk_mq_dispatch_rq_list' 'ep_poll' '__ext4_new_inode' 'ktime_get_real_seconds' [ 49.418181][ T8910] ================================================================== [ 49.426278][ T8910] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 49.433975][ T8910] [ 49.436291][ T8910] write to 0xffff88812230f064 of 4 bytes by task 8911 on cpu 0: [ 49.443956][ T8910] futex_wait_queue_me+0x17d/0x290 [ 49.449049][ T8910] futex_wait+0x17e/0x3a0 [ 49.453352][ T8910] do_futex+0xe2/0x15b0 [ 49.457479][ T8910] __x64_sys_futex+0x2dc/0x410 [ 49.462219][ T8910] do_syscall_64+0xc7/0x3b0 [ 49.466710][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.472579][ T8910] [ 49.474885][ T8910] read to 0xffff88812230f064 of 4 bytes by task 8910 on cpu 1: [ 49.482400][ T8910] complete_signal+0x85/0x5c0 [ 49.487049][ T8910] __send_signal+0x675/0x8a0 [ 49.491709][ T8910] send_signal+0x211/0x2a0 [ 49.496109][ T8910] do_send_sig_info+0x59/0xc0 [ 49.500767][ T8910] do_send_specific+0xd8/0x100 [ 49.505533][ T8910] do_tkill+0xf8/0x130 [ 49.509579][ T8910] __x64_sys_tgkill+0x6d/0x90 [ 49.514247][ T8910] do_syscall_64+0xc7/0x3b0 [ 49.518742][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.524607][ T8910] [ 49.526941][ T8910] Reported by Kernel Concurrency Sanitizer on: [ 49.533078][ T8910] CPU: 1 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 49.541383][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.551414][ T8910] ================================================================== [ 49.559456][ T8910] Kernel panic - not syncing: panic_on_warn set ... [ 49.566017][ T8910] CPU: 1 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 49.574232][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.584272][ T8910] Call Trace: [ 49.587568][ T8910] dump_stack+0x11d/0x187 [ 49.591881][ T8910] panic+0x210/0x640 [ 49.595755][ T8910] ? vprintk_func+0x89/0x13a [ 49.600337][ T8910] kcsan_report.cold+0xc/0x1a [ 49.604999][ T8910] kcsan_setup_watchpoint+0x3fb/0x440 [ 49.610351][ T8910] complete_signal+0x85/0x5c0 [ 49.615010][ T8910] ? __sigqueue_alloc+0x190/0x2c0 [ 49.620025][ T8910] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 49.625909][ T8910] __send_signal+0x675/0x8a0 [ 49.630481][ T8910] send_signal+0x211/0x2a0 [ 49.634883][ T8910] do_send_sig_info+0x59/0xc0 [ 49.639559][ T8910] do_send_specific+0xd8/0x100 [ 49.644298][ T8910] do_tkill+0xf8/0x130 [ 49.648351][ T8910] __x64_sys_tgkill+0x6d/0x90 [ 49.653006][ T8910] do_syscall_64+0xc7/0x3b0 [ 49.657513][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.663393][ T8910] RIP: 0033:0x468b26 [ 49.667270][ 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 [ 49.686849][ T8910] RSP: 002b:000000c000049eb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 49.695245][ T8910] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 49.703192][ T8910] RDX: 0000000000000017 RSI: 00000000000022cf RDI: 00000000000022cb [ 49.711223][ T8910] RBP: 000000c000049ed0 R08: 0000000000000000 R09: 0000000000000031 [ 49.719168][ T8910] R10: 00007f0c3339b968 R11: 0000000000000246 R12: 0000000000000000 [ 49.727126][ T8910] R13: 0000000000000198 R14: 0000000000000197 R15: 0000000000000200 [ 50.817261][ T8910] Shutting down cpus with NMI [ 50.823248][ T8910] Kernel Offset: disabled [ 50.827569][ T8910] Rebooting in 86400 seconds..