[ 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 '10.128.1.26' (ECDSA) to the list of known hosts. 2021/04/14 11:33:46 fuzzer started 2021/04/14 11:33:46 dialing manager at 10.128.0.163:41179 2021/04/14 11:33:46 syscalls: 3557 2021/04/14 11:33:46 code coverage: enabled 2021/04/14 11:33:46 comparison tracing: enabled 2021/04/14 11:33:46 extra coverage: enabled 2021/04/14 11:33:46 setuid sandbox: enabled 2021/04/14 11:33:46 namespace sandbox: enabled 2021/04/14 11:33:46 Android sandbox: /sys/fs/selinux/policy does not exist 2021/04/14 11:33:46 fault injection: enabled 2021/04/14 11:33:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/14 11:33:46 net packet injection: enabled 2021/04/14 11:33:46 net device setup: enabled 2021/04/14 11:33:46 concurrency sanitizer: enabled 2021/04/14 11:33:46 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/14 11:33:46 USB emulation: enabled 2021/04/14 11:33:46 hci packet injection: enabled 2021/04/14 11:33:46 wifi device emulation: enabled 2021/04/14 11:33:46 802.15.4 emulation: enabled 2021/04/14 11:33:49 suppressing KCSAN reports in functions: 'complete_signal' 'ext4_mb_regular_allocator' 'n_tty_receive_buf_common' 'do_sys_poll' '__ext4_new_inode' 'expire_timers' 'io_submit_sqes' 'do_signal_stop' 'audit_log_start' 'blk_mq_sched_dispatch_requests' 'pcpu_alloc' 'ext4_free_inode' 'kauditd_thread' '__xa_clear_mark' 'generic_write_end' 'xas_find_marked' 'do_exit' 'ext4_writepages' 'kvm_mmu_notifier_invalidate_range_end' 'alloc_pid' '__filemap_fdatawrite_range' 'ext4_mb_good_group' 'xas_clear_mark' 'do_nanosleep' 'delete_from_page_cache_batch' 'blk_mq_rq_ctx_init' 'blk_mq_dispatch_rq_list' 'ext4_free_inodes_count' 'do_select' 'wbt_done' 'step_into' 2021/04/14 11:33:49 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/14 11:33:49 fetching corpus: 48, signal 15551/19421 (executing program) 2021/04/14 11:33:49 fetching corpus: 98, signal 30116/35745 (executing program) 2021/04/14 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fetching corpus: 1348, signal 151660/191034 (executing program) 2021/04/14 11:33:51 fetching corpus: 1398, signal 152966/193589 (executing program) 2021/04/14 11:33:51 fetching corpus: 1448, signal 154656/196443 (executing program) 2021/04/14 11:33:51 fetching corpus: 1498, signal 157729/200502 (executing program) syzkaller login: [ 34.938539][ T8373] ================================================================== [ 34.946620][ T8373] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 34.954142][ T8373] [ 34.956441][ T8373] write to 0xffff888103c6502c of 4 bytes by task 8374 on cpu 1: [ 34.964078][ T8373] futex_wait_queue_me+0x186/0x250 [ 34.969168][ T8373] futex_wait+0x145/0x400 [ 34.973477][ T8373] do_futex+0x1062/0x1cd0 [ 34.977909][ T8373] __se_sys_futex+0x2a8/0x390 [ 34.982576][ T8373] __x64_sys_futex+0x74/0x80 [ 34.987142][ T8373] do_syscall_64+0x39/0x80 [ 34.991565][ T8373] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 34.997442][ T8373] [ 34.999740][ T8373] read to 0xffff888103c6502c of 4 bytes by task 8373 on cpu 0: [ 35.007252][ T8373] __send_signal+0x27f/0x790 [ 35.011815][ T8373] send_signal+0x398/0x3e0 [ 35.016211][ T8373] do_send_sig_info+0x9b/0xe0 [ 35.020866][ T8373] do_send_specific+0xc7/0x100 [ 35.025693][ T8373] __x64_sys_tgkill+0x108/0x140 [ 35.030560][ T8373] do_syscall_64+0x39/0x80 2021/04/14 11:33:51 fetching corpus: 1548, signal 160079/203953 (executing program) [ 35.034951][ T8373] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 35.040858][ T8373] [ 35.043157][ T8373] Reported by Kernel Concurrency Sanitizer on: [ 35.049275][ T8373] CPU: 0 PID: 8373 Comm: syz-fuzzer Not tainted 5.12.0-rc7-syzkaller #0 [ 35.057573][ T8373] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.067600][ T8373] ================================================================== 2021/04/14 11:33:51 fetching corpus: 1598, signal 161997/207001 (executing program) 2021/04/14 11:33:51 fetching corpus: 1648, signal 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