[  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 '10.128.0.236' (ECDSA) to the list of known hosts.
2020/06/30 22:39:26 fuzzer started
2020/06/30 22:39:26 dialing manager at 10.128.0.105:33683
2020/06/30 22:39:28 syscalls: 3106
2020/06/30 22:39:28 code coverage: enabled
2020/06/30 22:39:28 comparison tracing: enabled
2020/06/30 22:39:28 extra coverage: enabled
2020/06/30 22:39:28 setuid sandbox: enabled
2020/06/30 22:39:28 namespace sandbox: enabled
2020/06/30 22:39:28 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/30 22:39:28 fault injection: enabled
2020/06/30 22:39:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/30 22:39:28 net packet injection: enabled
2020/06/30 22:39:28 net device setup: enabled
2020/06/30 22:39:28 concurrency sanitizer: enabled
2020/06/30 22:39:28 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/30 22:39:28 USB emulation: enabled
2020/06/30 22:39:30 suppressing KCSAN reports in functions: 'blk_mq_rq_ctx_init' 'pcpu_alloc' 'ext4_ext_insert_extent' 'ext4_mb_regular_allocator' 'n_tty_receive_buf_common' '__ext4_new_inode' 'generic_write_end' 'blk_mq_dispatch_rq_list' '__xa_clear_mark' 'blk_mq_sched_dispatch_requests' 'do_nanosleep' 'do_epoll_wait' 'copy_process' 'find_get_pages_range_tag' 'ext4_free_inodes_count' '__mod_timer' 'sock_alloc_send_pskb' 'ext4_free_inode' 
syzkaller login: [   42.421895][ T8650] ==================================================================
[   42.430105][ T8650] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me
[   42.437621][ T8650] 
[   42.440020][ T8650] write to 0xffff88812459b0a4 of 4 bytes by task 8653 on cpu 1:
[   42.447627][ T8650]  futex_wait_queue_me+0x186/0x250
[   42.452712][ T8650]  futex_wait+0x145/0x390
[   42.457016][ T8650]  do_futex+0x144a/0x21c0
[   42.461329][ T8650]  __se_sys_futex+0x26d/0x330
[   42.465979][ T8650]  __x64_sys_futex+0x74/0x80
[   42.470542][ T8650]  do_syscall_64+0x51/0xb0
[   42.474967][ T8650]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   42.480918][ T8650] 
[   42.483228][ T8650] read to 0xffff88812459b0a4 of 4 bytes by task 8650 on cpu 0:
[   42.490840][ T8650]  __send_signal+0x26d/0x7d0
[   42.495405][ T8650]  send_signal+0x398/0x3e0
[   42.499811][ T8650]  do_send_sig_info+0x9b/0xe0
[   42.504565][ T8650]  do_send_specific+0xc7/0x100
[   42.509476][ T8650]  __x64_sys_tgkill+0x108/0x140
[   42.514504][ T8650]  do_syscall_64+0x51/0xb0
[   42.518895][ T8650]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   42.524770][ T8650] 
[   42.527068][ T8650] Reported by Kernel Concurrency Sanitizer on:
[   42.533193][ T8650] CPU: 0 PID: 8650 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0
[   42.541763][ T8650] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   42.551792][ T8650] ==================================================================
[   42.559851][ T8650] Kernel panic - not syncing: panic_on_warn set ...
[   42.566430][ T8650] CPU: 0 PID: 8650 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0
[   42.574635][ T8650] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   42.584666][ T8650] Call Trace:
[   42.587950][ T8650]  dump_stack+0x10f/0x19d
[   42.592252][ T8650]  panic+0x207/0x64a
[   42.596143][ T8650]  ? vprintk_emit+0x44a/0x4f0
[   42.600795][ T8650]  kcsan_report+0x684/0x690
[   42.605275][ T8650]  ? kcsan_setup_watchpoint+0x453/0x4d0
[   42.610986][ T8650]  ? __send_signal+0x26d/0x7d0
[   42.615764][ T8650]  ? send_signal+0x398/0x3e0
[   42.620328][ T8650]  ? do_send_sig_info+0x9b/0xe0
[   42.625257][ T8650]  ? do_send_specific+0xc7/0x100
[   42.630193][ T8650]  ? __x64_sys_tgkill+0x108/0x140
[   42.635190][ T8650]  ? do_syscall_64+0x51/0xb0
[   42.640711][ T8650]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   42.646849][ T8650]  kcsan_setup_watchpoint+0x453/0x4d0
[   42.652217][ T8650]  __send_signal+0x26d/0x7d0
[   42.665467][ T8650]  send_signal+0x398/0x3e0
[   42.669857][ T8650]  do_send_sig_info+0x9b/0xe0
[   42.674942][ T8650]  do_send_specific+0xc7/0x100
[   42.679681][ T8650]  __x64_sys_tgkill+0x108/0x140
[   42.684510][ T8650]  do_syscall_64+0x51/0xb0
[   42.690218][ T8650]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   42.696107][ T8650] RIP: 0033:0x468b26
[   42.699984][ T8650] Code: Bad RIP value.
[   42.704020][ T8650] RSP: 002b:000000c00004fed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea
[   42.712417][ T8650] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26
[   42.720378][ T8650] RDX: 0000000000000017 RSI: 00000000000021cd RDI: 00000000000021c8
[   42.728350][ T8650] RBP: 000000c00004fef8 R08: 0000001882c6f8fa R09: 00007ffcc8380080
[   42.736300][ T8650] R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000055
[   42.745897][ T8650] R13: 0000000000000020 R14: 0000000000000069 R15: ffffffffffffffff
[   42.755142][ T8650] Kernel Offset: disabled
[   42.759450][ T8650] Rebooting in 86400 seconds..