Warning: Permanently added '10.128.1.53' (ECDSA) to the list of known hosts. 2021/05/24 13:39:41 fuzzer started 2021/05/24 13:39:41 dialing manager at 10.128.0.163:35245 2021/05/24 13:39:41 syscalls: 1997 2021/05/24 13:39:41 code coverage: enabled 2021/05/24 13:39:41 comparison tracing: enabled 2021/05/24 13:39:41 extra coverage: enabled 2021/05/24 13:39:41 setuid sandbox: enabled 2021/05/24 13:39:41 namespace sandbox: enabled 2021/05/24 13:39:41 Android sandbox: enabled 2021/05/24 13:39:41 fault injection: enabled 2021/05/24 13:39:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/24 13:39:41 net packet injection: /dev/net/tun does not exist 2021/05/24 13:39:41 net device setup: enabled 2021/05/24 13:39:41 concurrency sanitizer: enabled 2021/05/24 13:39:41 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/24 13:39:41 USB emulation: /dev/raw-gadget does not exist 2021/05/24 13:39:41 hci packet injection: /dev/vhci does not exist 2021/05/24 13:39:41 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/24 13:39:41 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/05/24 13:39:42 suppressing KCSAN reports in functions: 'mark_buffer_dirty_inode' 'xas_find_marked' 'step_into' 'do_signal_stop' '__send_signal' 'shmem_mknod' 'tick_sched_timer' '_find_next_bit' 'do_exit' 'xas_clear_mark' 'tick_nohz_next_event' 'get_signal' '__mark_inode_dirty' 'exit_signals' 'do_readlinkat' 'dd_has_work' 'blk_mq_dispatch_rq_list' 'generic_write_end' '__xa_clear_mark' 'kauditd_thread' '__io_queue_sqe' 'blk_mq_rq_ctx_init' '__ext4_new_inode' 'do_sys_poll' 'n_tty_receive_buf_common' 'alloc_pid' 'ext4_free_inodes_count' 'blk_mq_sched_dispatch_requests' 'lookup_fast' 'has_bh_in_lru' 'audit_log_start' 'do_nanosleep' 'fast_dput' 2021/05/24 13:39:42 fetching corpus: 0, signal 0/2000 (executing program) syzkaller login: [ 18.069571][ T1757] ================================================================== [ 18.072218][ T1757] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 18.074480][ T1757] [ 18.075322][ T1757] write to 0xffff8881008280ac of 4 bytes by task 1755 on cpu 0: [ 18.078137][ T1757] futex_wait_queue_me+0x198/0x260 [ 18.079716][ T1757] futex_wait+0x143/0x430 [ 18.080998][ T1757] do_futex+0x9d8/0x1ee0 [ 18.081859][ T1757] __se_sys_futex+0x21c/0x380 [ 18.083039][ T1757] __x64_sys_futex+0x74/0x80 [ 18.084154][ T1757] do_syscall_64+0x4a/0x90 [ 18.086164][ T1757] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 18.087671][ T1757] [ 18.088395][ T1757] read to 0xffff8881008280ac of 4 bytes by task 1757 on cpu 1: [ 18.093316][ T1757] prepare_signal+0x952/0xeb0 [ 18.097975][ T1757] __send_signal+0x64/0x760 [ 18.102453][ T1757] send_signal+0x281/0x390 [ 18.106935][ T1757] do_send_specific+0x13d/0x1c0 [ 18.111845][ T1757] __x64_sys_tgkill+0x108/0x140 2021/05/24 13:39:42 fetching corpus: 50, signal 15456/19187 (executing program) [ 18.116670][ T1757] do_syscall_64+0x4a/0x90 [ 18.121162][ T1757] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 18.127031][ T1757] [ 18.129360][ T1757] Reported by Kernel Concurrency Sanitizer on: [ 18.135567][ T1757] CPU: 1 PID: 1757 Comm: syz-fuzzer Not tainted 5.13.0-rc3-syzkaller #0 [ 18.143965][ T1757] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.153993][ T1757] ================================================================== 2021/05/24 13:39:43 fetching corpus: 100, signal 23395/28818 (executing program) 2021/05/24 13:39:43 fetching corpus: 150, signal 27631/34713 (executing program) 2021/05/24 13:39:43 fetching corpus: 200, signal 32923/41544 (executing program) 2021/05/24 13:39:43 fetching corpus: 250, signal 37661/47763 (executing program) 2021/05/24 13:39:43 fetching corpus: 300, signal 41693/53228 (executing program) 2021/05/24 13:39:43 fetching corpus: 350, signal 44667/57639 (executing program) 2021/05/24 13:39:43 fetching corpus: 400, signal 47613/61958 (executing 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