[ 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 '10.128.0.210' (ECDSA) to the list of known hosts. 2021/04/03 13:56:26 fuzzer started 2021/04/03 13:56:26 dialing manager at 10.128.0.163:38381 2021/04/03 13:56:28 syscalls: 3557 2021/04/03 13:56:28 code coverage: enabled 2021/04/03 13:56:28 comparison tracing: enabled 2021/04/03 13:56:28 extra coverage: enabled 2021/04/03 13:56:28 setuid sandbox: enabled 2021/04/03 13:56:28 namespace sandbox: enabled 2021/04/03 13:56:28 Android sandbox: /sys/fs/selinux/policy does not exist 2021/04/03 13:56:28 fault injection: enabled 2021/04/03 13:56:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/03 13:56:28 net packet injection: enabled 2021/04/03 13:56:28 net device setup: enabled 2021/04/03 13:56:28 concurrency sanitizer: enabled 2021/04/03 13:56:28 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/03 13:56:28 USB emulation: enabled 2021/04/03 13:56:28 hci packet injection: enabled 2021/04/03 13:56:28 wifi device emulation: enabled 2021/04/03 13:56:28 802.15.4 emulation: enabled 2021/04/03 13:56:30 suppressing KCSAN reports in functions: 'kauditd_thread' '__xa_clear_mark' 'ext4_setattr' 'do_nanosleep' 'ext4_free_inodes_count' 'alloc_pid' 'generic_write_end' 'ext4_writepages' '__mark_inode_dirty' 'blk_mq_rq_ctx_init' 'next_uptodate_page' '__send_signal' 'pcpu_alloc' 'shmem_file_read_iter' 'ext4_free_inode' 'expire_timers' '__mod_timer' 'dput' 'wbt_done' '__ext4_new_inode' 'do_sys_poll' 'n_tty_receive_buf_common' 'dd_has_work' 'ext4_mb_regular_allocator' 'blk_mq_dispatch_rq_list' 'ext4_ext_try_to_merge_right' 'xas_clear_mark' '__delete_from_page_cache' 'blk_mq_sched_dispatch_requests' 'bpf_lru_pop_free' 2021/04/03 13:56:30 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/03 13:56:30 fetching corpus: 50, signal 20388/24191 (executing program) 2021/04/03 13:56:30 fetching corpus: 100, signal 30680/36218 (executing program) 2021/04/03 13:56:30 fetching corpus: 150, signal 39934/47132 (executing program) syzkaller login: [ 34.619344][ T8351] ================================================================== [ 34.627475][ T8351] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 34.635380][ T8351] [ 34.637684][ T8351] write to 0xffff88810b81f02c of 4 bytes by task 8346 on cpu 1: [ 34.645290][ T8351] futex_wait_queue_me+0x186/0x250 [ 34.650398][ T8351] futex_wait+0x145/0x400 [ 34.654707][ T8351] do_futex+0x1062/0x1cd0 [ 34.659011][ T8351] __se_sys_futex+0x2a8/0x390 [ 34.663665][ T8351] __x64_sys_futex+0x74/0x80 [ 34.668238][ T8351] do_syscall_64+0x39/0x80 [ 34.672629][ T8351] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 34.678499][ T8351] [ 34.680799][ T8351] read to 0xffff88810b81f02c of 4 bytes by task 8351 on cpu 0: [ 34.688309][ T8351] complete_signal+0x7c/0x600 [ 34.692961][ T8351] __send_signal+0x680/0x790 [ 34.697528][ T8351] send_signal+0x398/0x3e0 [ 34.701920][ T8351] do_send_sig_info+0x9b/0xe0 [ 34.706570][ T8351] do_send_specific+0xc7/0x100 [ 34.711305][ T8351] __x64_sys_tgkill+0x108/0x140 2021/04/03 13:56:31 fetching corpus: 200, signal 47842/56696 (executing program) [ 34.716130][ T8351] do_syscall_64+0x39/0x80 [ 34.720518][ T8351] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 34.726386][ T8351] [ 34.728683][ T8351] Reported by Kernel Concurrency Sanitizer on: [ 34.734809][ T8351] CPU: 0 PID: 8351 Comm: syz-fuzzer Not tainted 5.12.0-rc5-syzkaller #0 [ 34.743147][ T8351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.753333][ T8351] ================================================================== 2021/04/03 13:56:31 fetching corpus: 250, signal 54964/65360 (executing program) 2021/04/03 13:56:31 fetching corpus: 300, signal 60209/72110 (executing program) 2021/04/03 13:56:31 fetching corpus: 350, signal 65796/79180 (executing program) 2021/04/03 13:56:31 fetching corpus: 400, signal 73422/88119 (executing program) 2021/04/03 13:56:31 fetching 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