[  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 '10.128.0.172' (ECDSA) to the list of known hosts.
2021/02/10 23:46:56 fuzzer started
2021/02/10 23:46:56 dialing manager at 10.128.0.163:42439
2021/02/10 23:47:01 syscalls: 3470
2021/02/10 23:47:01 code coverage: enabled
2021/02/10 23:47:01 comparison tracing: enabled
2021/02/10 23:47:01 extra coverage: enabled
2021/02/10 23:47:01 setuid sandbox: enabled
2021/02/10 23:47:01 namespace sandbox: enabled
2021/02/10 23:47:01 Android sandbox: /sys/fs/selinux/policy does not exist
2021/02/10 23:47:01 fault injection: enabled
2021/02/10 23:47:01 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2021/02/10 23:47:01 net packet injection: enabled
2021/02/10 23:47:01 net device setup: enabled
2021/02/10 23:47:01 concurrency sanitizer: enabled
2021/02/10 23:47:01 devlink PCI setup: PCI device 0000:00:10.0 is not available
2021/02/10 23:47:01 USB emulation: enabled
2021/02/10 23:47:01 hci packet injection: enabled
2021/02/10 23:47:01 wifi device emulation: enabled
2021/02/10 23:47:04 suppressing KCSAN reports in functions: 'xas_find_marked' '__ext4_new_inode' 'blk_mq_rq_ctx_init' 'find_get_pages_range_tag' 'blk_mq_sched_dispatch_requests' 'futex_wait_queue_me' 'pcpu_alloc' '__ext4_handle_dirty_metadata' '__mark_inode_dirty' 'do_nanosleep' 'jbd2_journal_commit_transaction' 'exit_mm' 'do_select' 'ext4_mb_regular_allocator' '__delete_from_page_cache' '__xa_set_mark' 'ext4_mb_good_group' 'wbt_done' 'ext4_fc_commit' 'alloc_pid' 'ext4_mark_iloc_dirty' '_prb_read_valid' '__mod_timer' 'ext4_write_end' 'do_sys_poll' 'jbd2_journal_dirty_metadata' '__blk_mq_sched_dispatch_requests' 'lru_add_drain_all' '__xa_clear_mark' '__jbd2_journal_file_buffer' 'start_this_handle' 'expire_timers' 'kauditd_thread' 'dd_has_work' '__send_signal' 'n_tty_receive_buf_common' 'ext4_free_inodes_count' 'do_signal_stop' 'generic_write_end' 'blk_mq_dispatch_rq_list' 'ext4_da_write_end' '__ext4_update_other_inode_time' 
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syzkaller login: [   48.754493][ T8407] ==================================================================
[   48.762619][ T8407] BUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait
[   48.769667][ T8407] 
[   48.771977][ T8407] write to 0xffff88810775c058 of 8 bytes by task 8406 on cpu 1:
[   48.779586][ T8407]  do_epoll_wait+0x4d3/0xf00
[   48.784161][ T8407]  __se_sys_epoll_pwait+0xfb/0x210
[   48.789273][ T8407]  __x64_sys_epoll_pwait+0x74/0x80
[   48.794367][ T8407]  do_syscall_64+0x39/0x80
[   48.798763][ T8407]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   48.804639][ T8407] 
[   48.806943][ T8407] read to 0xffff88810775c058 of 8 bytes by task 8407 on cpu 0:
[   48.814460][ T8407]  do_epoll_wait+0x292/0xf00
[   48.819036][ T8407]  __se_sys_epoll_pwait+0xfb/0x210
[   48.824136][ T8407]  __x64_sys_epoll_pwait+0x74/0x80
[   48.829230][ T8407]  do_syscall_64+0x39/0x80
[   48.833628][ T8407]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   48.839503][ T8407] 
[   48.841804][ T8407] Reported by Kernel Concurrency Sanitizer on:
[   48.847926][ T8407] CPU: 0 PID: 8407 Comm: syz-fuzzer Not tainted 5.11.0-rc7-syzkaller #0
[   48.856226][ T8407] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.866259][ T8407] ==================================================================
[   48.874292][ T8407] Kernel panic - not syncing: panic_on_warn set ...
[   48.880852][ T8407] CPU: 0 PID: 8407 Comm: syz-fuzzer Not tainted 5.11.0-rc7-syzkaller #0
[   48.889170][ T8407] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.899215][ T8407] Call Trace:
[   48.902479][ T8407]  dump_stack+0x116/0x15d
[   48.906794][ T8407]  panic+0x1e7/0x5fa
[   48.910670][ T8407]  ? vprintk_emit+0x2e2/0x360
[   48.915341][ T8407]  kcsan_report+0x67b/0x680
[   48.919830][ T8407]  ? kcsan_setup_watchpoint+0x472/0x4d0
[   48.925358][ T8407]  ? do_epoll_wait+0x292/0xf00
[   48.930105][ T8407]  ? __se_sys_epoll_pwait+0xfb/0x210
[   48.935372][ T8407]  ? __x64_sys_epoll_pwait+0x74/0x80
[   48.940653][ T8407]  ? do_syscall_64+0x39/0x80
[   48.945226][ T8407]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   48.951279][ T8407]  ? __sys_sendmsg+0x80/0x270
[   48.955940][ T8407]  ? __fget_light+0x219/0x260
[   48.960613][ T8407]  kcsan_setup_watchpoint+0x472/0x4d0
[   48.965968][ T8407]  do_epoll_wait+0x292/0xf00
[   48.970557][ T8407]  ? vfs_read+0x3e1/0x5d0
[   48.974868][ T8407]  __se_sys_epoll_pwait+0xfb/0x210
[   48.979982][ T8407]  __x64_sys_epoll_pwait+0x74/0x80
[   48.985076][ T8407]  do_syscall_64+0x39/0x80
[   48.989477][ T8407]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   48.995350][ T8407] RIP: 0033:0x46e380
[   48.999230][ T8407] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
[   49.018818][ T8407] RSP: 002b:000000c00003b7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
[   49.027212][ T8407] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000046e380
[   49.035163][ T8407] RDX: 0000000000000080 RSI: 000000c00003b840 RDI: 0000000000000003
[   49.043130][ T8407] RBP: 000000c00003be40 R08: 0000000000000000 R09: 0000000000000010
[   49.051082][ T8407] R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
[   49.059032][ T8407] R13: 0000000000002000 R14: 0000000000000008 R15: 0000000000000002
[   49.067684][ T8407] Kernel Offset: disabled
[   49.072025][ T8407] Rebooting in 86400 seconds..