[ 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 '10.128.1.99' (ECDSA) to the list of known hosts. 2021/04/01 18:39:15 fuzzer started 2021/04/01 18:39:15 dialing manager at 10.128.0.163:35811 2021/04/01 18:39:16 syscalls: 3557 2021/04/01 18:39:16 code coverage: enabled 2021/04/01 18:39:16 comparison tracing: enabled 2021/04/01 18:39:16 extra coverage: enabled 2021/04/01 18:39:16 setuid sandbox: enabled 2021/04/01 18:39:16 namespace sandbox: enabled 2021/04/01 18:39:16 Android sandbox: /sys/fs/selinux/policy does not exist 2021/04/01 18:39:16 fault injection: enabled 2021/04/01 18:39:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/01 18:39:16 net packet injection: enabled 2021/04/01 18:39:16 net device setup: enabled 2021/04/01 18:39:16 concurrency sanitizer: enabled 2021/04/01 18:39:16 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/01 18:39:16 USB emulation: enabled 2021/04/01 18:39:16 hci packet injection: enabled 2021/04/01 18:39:16 wifi device emulation: enabled 2021/04/01 18:39:16 802.15.4 emulation: enabled 2021/04/01 18:39:18 suppressing KCSAN reports in functions: 'ext4_free_inode' '__ext4_new_inode' '__xa_clear_mark' 'ext4_writepages' '__add_to_page_cache_locked' '_prb_read_valid' 'shmem_unlink' 'xas_clear_mark' 'blk_mq_dispatch_rq_list' 'blk_mq_rq_ctx_init' 'yama_task_free' 'dd_has_work' 'blk_mq_sched_dispatch_requests' 'generic_write_end' 'do_nanosleep' 'ext4_free_inodes_count' 'alloc_pid' 'wbt_done' '__mark_inode_dirty' 'expire_timers' 'ext4_sync_file' 2021/04/01 18:39:18 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/01 18:39:18 fetching corpus: 45, signal 11144/15039 (executing program) 2021/04/01 18:39:19 fetching corpus: 95, signal 29750/35328 (executing program) 2021/04/01 18:39:19 fetching corpus: 145, signal 41502/48657 (executing program) 2021/04/01 18:39:19 fetching corpus: 192, signal 47774/56519 (executing program) 2021/04/01 18:39:19 fetching corpus: 241, signal 57688/67816 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program) 2021/04/01 18:39:20 fetching corpus: 885, signal 108688/134784 (executing program) 2021/04/01 18:39:20 fetching corpus: 935, signal 111884/139007 (executing program) 2021/04/01 18:39:20 fetching corpus: 984, signal 113834/142067 (executing program) 2021/04/01 18:39:20 fetching corpus: 1034, signal 116290/145596 (executing program) 2021/04/01 18:39:20 fetching corpus: 1084, signal 119736/149898 (executing program) 2021/04/01 18:39:20 fetching corpus: 1134, signal 121614/152840 (executing program) 2021/04/01 18:39:20 fetching corpus: 1184, signal 124471/156563 (executing program) syzkaller login: [ 35.681066][ T8352] ================================================================== [ 35.689165][ T8352] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 35.696967][ T8352] [ 35.699276][ T8352] write to 0xffff888105d9a02c of 4 bytes by task 8354 on cpu 0: [ 35.706967][ T8352] futex_wait_queue_me+0x186/0x250 [ 35.712062][ T8352] futex_wait+0x145/0x400 [ 35.716385][ T8352] do_futex+0x1062/0x1cd0 [ 35.720717][ T8352] __se_sys_futex+0x2a8/0x390 [ 35.725368][ T8352] __x64_sys_futex+0x74/0x80 [ 35.729933][ T8352] do_syscall_64+0x39/0x80 [ 35.734695][ T8352] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 35.740566][ T8352] [ 35.742863][ T8352] read to 0xffff888105d9a02c of 4 bytes by task 8352 on cpu 1: [ 35.750375][ T8352] complete_signal+0x7c/0x600 [ 35.755465][ T8352] __send_signal+0x680/0x790 [ 35.760032][ T8352] send_signal+0x398/0x3e0 [ 35.764434][ T8352] do_send_sig_info+0x9b/0xe0 [ 35.769091][ T8352] do_send_specific+0xc7/0x100 [ 35.773846][ T8352] __x64_sys_tgkill+0x108/0x140 2021/04/01 18:39:20 fetching corpus: 1234, signal 126527/159599 (executing program) [ 35.778684][ T8352] do_syscall_64+0x39/0x80 [ 35.783460][ T8352] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 35.789676][ T8352] [ 35.792213][ T8352] Reported by Kernel Concurrency Sanitizer on: [ 35.799138][ T8352] CPU: 1 PID: 8352 Comm: syz-fuzzer Not tainted 5.12.0-rc5-syzkaller #0 [ 35.807462][ T8352] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.817520][ T8352] ================================================================== 2021/04/01 18:39:20 fetching corpus: 1283, signal 129088/162996 (executing program) 2021/04/01 18:39:20 fetching corpus: 1332, signal 131014/165871 (executing program) 2021/04/01 18:39:20 fetching corpus: 1382, signal 133036/168796 (executing program) 2021/04/01 18:39:20 fetching corpus: 1432, signal 134567/171262 (executing program) 2021/04/01 18:39:20 fetching corpus: 1482, signal 136139/173781 (executing program) 2021/04/01 18:39:21 fetching corpus: 1532, signal 138607/177025 (executing program) 2021/04/01 18:39:21 fetching corpus: 1580, signal 140667/179900 (executing program) 2021/04/01 18:39:21 fetching corpus: 1630, signal 142209/182346 (executing program) 2021/04/01 18:39:21 fetching corpus: 1680, signal 145092/185792 (executing program) 2021/04/01 18:39:21 fetching corpus: 1730, 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