[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[   22.244268][    C1] random: crng init done
[   22.244274][    C1] random: 7 urandom warning(s) missed due to ratelimiting


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.212' (ECDSA) to the list of known hosts.
2020/06/20 10:25:37 fuzzer started
2020/06/20 10:25:38 dialing manager at 10.128.0.105:37899
2020/06/20 10:25:38 syscalls: 3092
2020/06/20 10:25:38 code coverage: enabled
2020/06/20 10:25:38 comparison tracing: enabled
2020/06/20 10:25:38 extra coverage: enabled
2020/06/20 10:25:38 setuid sandbox: enabled
2020/06/20 10:25:38 namespace sandbox: enabled
2020/06/20 10:25:38 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/20 10:25:38 fault injection: enabled
2020/06/20 10:25:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/20 10:25:38 net packet injection: enabled
2020/06/20 10:25:38 net device setup: enabled
2020/06/20 10:25:38 concurrency sanitizer: enabled
2020/06/20 10:25:38 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/20 10:25:38 USB emulation: enabled
2020/06/20 10:25:38 suppressing KCSAN reports in functions: '__ext4_new_inode' 'generic_write_end' 'ext4_free_inodes_count' 'ext4_free_inode' 'do_epoll_wait' '__blkdev_put' '__send_signal' 'page_counter_charge' '__xa_clear_mark' 'alloc_pid' 
syzkaller login: [   32.137481][ T8627] ==================================================================
[   32.146308][ T8627] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal
[   32.154083][ T8627] 
[   32.156403][ T8627] write to 0xffff888126bf0064 of 4 bytes by task 8629 on cpu 1:
[   32.164408][ T8627]  futex_wait_queue_me+0x186/0x250
[   32.169721][ T8627]  futex_wait+0x153/0x3a0
[   32.174042][ T8627]  do_futex+0x144a/0x21b0
[   32.178503][ T8627]  __se_sys_futex+0x26d/0x330
[   32.183167][ T8627]  __x64_sys_futex+0x74/0x80
[   32.187958][ T8627]  do_syscall_64+0x71/0x120
[   32.192489][ T8627]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.198800][ T8627] 
[   32.201131][ T8627] read to 0xffff888126bf0064 of 4 bytes by task 8627 on cpu 0:
[   32.209061][ T8627]  prepare_signal+0x88d/0xdb0
[   32.213928][ T8627]  __send_signal+0x64/0x7d0
[   32.218727][ T8627]  send_signal+0x398/0x3e0
[   32.223554][ T8627]  do_send_sig_info+0x9b/0xe0
[   32.228369][ T8627]  do_send_specific+0xc7/0x100
[   32.233473][ T8627]  __x64_sys_tgkill+0x108/0x140
[   32.238666][ T8627]  do_syscall_64+0x71/0x120
[   32.243331][ T8627]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.249227][ T8627] 
[   32.251627][ T8627] Reported by Kernel Concurrency Sanitizer on:
[   32.257764][ T8627] CPU: 0 PID: 8627 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0
[   32.266080][ T8627] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.276180][ T8627] ==================================================================
[   32.284369][ T8627] Kernel panic - not syncing: panic_on_warn set ...
[   32.291350][ T8627] CPU: 0 PID: 8627 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0
[   32.299702][ T8627] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.310214][ T8627] Call Trace:
[   32.316139][ T8627]  dump_stack+0x10f/0x19d
[   32.322982][ T8627]  panic+0x1f8/0x63a
[   32.329849][ T8627]  ? vprintk_emit+0x44a/0x4f0
[   32.334847][ T8627]  kcsan_report+0x684/0x690
[   32.340198][ T8627]  ? kcsan_setup_watchpoint+0x453/0x4d0
[   32.347290][ T8627]  ? prepare_signal+0x88d/0xdb0
[   32.352999][ T8627]  ? __send_signal+0x64/0x7d0
[   32.358135][ T8627]  ? send_signal+0x398/0x3e0
[   32.363416][ T8627]  ? do_send_sig_info+0x9b/0xe0
[   32.369090][ T8627]  ? do_send_specific+0xc7/0x100
[   32.374725][ T8627]  ? __x64_sys_tgkill+0x108/0x140
[   32.381352][ T8627]  ? do_syscall_64+0x71/0x120
[   32.386032][ T8627]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.395147][ T8627]  ? line6_data_received+0x72/0x250
[   32.400480][ T8627]  kcsan_setup_watchpoint+0x453/0x4d0
[   32.406255][ T8627]  prepare_signal+0x88d/0xdb0
[   32.412061][ T8627]  __send_signal+0x64/0x7d0
[   32.416731][ T8627]  ? __rcu_read_unlock+0x34/0x260
[   32.422425][ T8627]  send_signal+0x398/0x3e0
[   32.427214][ T8627]  do_send_sig_info+0x9b/0xe0
[   32.432472][ T8627]  do_send_specific+0xc7/0x100
[   32.437611][ T8627]  __x64_sys_tgkill+0x108/0x140
[   32.443242][ T8627]  do_syscall_64+0x71/0x120
[   32.447825][ T8627]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.454084][ T8627] RIP: 0033:0x468b26
[   32.458041][ T8627] Code: Bad RIP value.
[   32.462326][ T8627] RSP: 002b:000000c00004feb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea
[   32.471278][ T8627] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26
[   32.479806][ T8627] RDX: 0000000000000017 RSI: 00000000000021b5 RDI: 00000000000021b1
[   32.487856][ T8627] RBP: 000000c00004fed0 R08: 0000000000000000 R09: 0000000000000000
[   32.496360][ T8627] R10: 000000c00004fec0 R11: 0000000000000246 R12: 0000000000000012
[   32.504659][ T8627] R13: 000000c00002e068 R14: 00000000000000c0 R15: 000000c000501d60
[   33.640834][ T8627] Shutting down cpus with NMI
[   33.648522][ T8627] Kernel Offset: disabled
[   33.653127][ T8627] Rebooting in 86400 seconds..