[ OK ] Started OpenBSD Secure Shell server. [ 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 '10.128.0.100' (ECDSA) to the list of known hosts. 2021/05/03 15:04:37 fuzzer started 2021/05/03 15:04:38 dialing manager at 10.128.0.163:42831 2021/05/03 15:04:38 syscalls: 1997 2021/05/03 15:04:38 code coverage: enabled 2021/05/03 15:04:38 comparison tracing: enabled 2021/05/03 15:04:38 extra coverage: enabled 2021/05/03 15:04:38 setuid sandbox: enabled 2021/05/03 15:04:38 namespace sandbox: enabled 2021/05/03 15:04:38 Android sandbox: enabled 2021/05/03 15:04:38 fault injection: enabled 2021/05/03 15:04:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/03 15:04:38 net packet injection: /dev/net/tun does not exist 2021/05/03 15:04:38 net device setup: enabled 2021/05/03 15:04:38 concurrency sanitizer: enabled 2021/05/03 15:04:38 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/03 15:04:38 USB emulation: /dev/raw-gadget does not exist 2021/05/03 15:04:38 hci packet injection: /dev/vhci does not exist 2021/05/03 15:04:38 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/03 15:04:38 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/05/03 15:04:39 suppressing KCSAN reports in functions: 'generic_write_end' 'xas_clear_mark' '__xa_set_mark' 'blk_mq_sched_dispatch_requests' '__writeback_single_inode' '__xa_clear_mark' 'blk_mq_rq_ctx_init' 'ext4_free_inode' 'audit_log_start' 'ext4_mb_regular_allocator' 'handle_irq_event' 'blk_mq_dispatch_rq_list' 'ns_capable' 'xas_find_marked' 'ext4_free_inodes_count' 'tick_nohz_next_event' 'shmem_symlink' 'step_into' 'expire_timers' 'dd_has_work' 'do_select' 'do_readlinkat' 'n_tty_receive_buf_common' 'do_signal_stop' 'ext4_ext_insert_extent' '__blkdev_put' '__process_echoes' 'ext4_mark_iloc_dirty' 'tick_nohz_stop_tick' 'do_sys_poll' 'shmem_getpage_gfp' '__mark_inode_dirty' 'complete_signal' 'ext4_mb_good_group' 'kauditd_thread' '_prb_read_valid' '__ext4_new_inode' 'shmem_file_read_iter' 'exit_mm' 'ext4_writepages' 'tick_sched_timer' 'do_nanosleep' 2021/05/03 15:04:39 fetching corpus: 50, signal 12568/14484 (executing program) 2021/05/03 15:04:39 fetching corpus: 100, signal 21794/25488 (executing program) 2021/05/03 15:04:39 fetching corpus: 150, signal 28219/33624 (executing program) 2021/05/03 15:04:39 fetching corpus: 200, signal 33959/41002 (executing program) 2021/05/03 15:04:39 fetching corpus: 250, signal 36401/45133 (executing program) 2021/05/03 15:04:39 fetching corpus: 300, signal 40762/51077 (executing program) 2021/05/03 15:04:39 fetching corpus: 350, signal 44246/56094 (executing program) 2021/05/03 15:04:39 fetching corpus: 400, signal 47449/60811 (executing program) 2021/05/03 15:04:39 fetching corpus: 450, signal 50713/65538 (executing program) 2021/05/03 15:04:39 fetching corpus: 500, signal 53742/70035 (executing program) 2021/05/03 15:04:39 fetching corpus: 550, signal 55193/73008 (executing program) 2021/05/03 15:04:39 fetching corpus: 600, signal 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fetching corpus: 4200, signal 143075/227428 (executing program) 2021/05/03 15:04:42 fetching corpus: 4250, signal 143617/228643 (executing program) 2021/05/03 15:04:42 fetching corpus: 4300, signal 143975/229772 (executing program) 2021/05/03 15:04:42 fetching corpus: 4350, signal 144595/230983 (executing program) 2021/05/03 15:04:42 fetching corpus: 4400, signal 145273/232222 (executing program) 2021/05/03 15:04:42 fetching corpus: 4450, signal 145868/233407 (executing program) 2021/05/03 15:04:42 fetching corpus: 4500, signal 146564/234701 (executing program) 2021/05/03 15:04:42 fetching corpus: 4550, signal 147092/235896 (executing program) 2021/05/03 15:04:42 fetching corpus: 4600, signal 147795/237108 (executing program) 2021/05/03 15:04:42 fetching corpus: 4650, signal 148465/238298 (executing program) 2021/05/03 15:04:42 fetching corpus: 4700, signal 149140/239512 (executing program) 2021/05/03 15:04:42 fetching corpus: 4750, signal 149890/240753 (executing program) 2021/05/03 15:04:42 fetching corpus: 4800, signal 150543/241889 (executing program) 2021/05/03 15:04:42 fetching corpus: 4850, signal 151128/243046 (executing program) 2021/05/03 15:04:42 fetching corpus: 4900, signal 151439/244123 (executing program) syzkaller login: [ 22.737827][ T1751] ================================================================== [ 22.739143][ T1751] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 22.740302][ T1751] [ 22.740669][ T1751] write to 0xffff8881054db02c of 4 bytes by task 1746 on cpu 0: [ 22.741813][ T1751] futex_wait_queue_me+0x198/0x260 [ 22.742506][ T1751] futex_wait+0x143/0x430 [ 22.743108][ T1751] do_futex+0x9e8/0x1ee0 [ 22.743721][ T1751] __se_sys_futex+0x2a8/0x390 [ 22.744363][ T1751] __x64_sys_futex+0x74/0x80 [ 22.745050][ T1751] do_syscall_64+0x4a/0x90 [ 22.745721][ T1751] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 22.746528][ T1751] [ 22.746855][ T1751] read to 0xffff8881054db02c of 4 bytes by task 1751 on cpu 1: [ 22.747987][ T1751] prepare_signal+0x952/0xeb0 [ 22.748644][ T1751] __send_signal+0x64/0x760 [ 22.749257][ T1751] send_signal+0x281/0x390 [ 22.749856][ T1751] do_send_specific+0x13d/0x1c0 [ 22.750530][ T1751] __x64_sys_tgkill+0x108/0x140 [ 22.751635][ T1751] do_syscall_64+0x4a/0x90 [ 22.752602][ T1751] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 22.753700][ T1751] [ 22.754144][ T1751] Reported by Kernel Concurrency Sanitizer on: [ 22.755075][ T1751] CPU: 1 PID: 1751 Comm: syz-fuzzer Not tainted 5.12.0-syzkaller #0 [ 22.756441][ T1751] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.759019][ T1751] ================================================================== 2021/05/03 15:04:42 fetching corpus: 4950, signal 152045/245269 (executing program) 2021/05/03 15:04:42 fetching corpus: 5000, signal 153139/246593 (executing program) 2021/05/03 15:04:42 fetching corpus: 5050, signal 153543/247626 (executing program) 2021/05/03 15:04:42 fetching corpus: 5100, signal 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