Warning: Permanently added '10.128.15.198' (ECDSA) to the list of known hosts. 2021/04/24 02:06:28 fuzzer started 2021/04/24 02:06:28 dialing manager at 10.128.0.163:37967 2021/04/24 02:06:28 syscalls: 1997 2021/04/24 02:06:28 code coverage: enabled 2021/04/24 02:06:28 comparison tracing: enabled 2021/04/24 02:06:28 extra coverage: enabled 2021/04/24 02:06:28 setuid sandbox: enabled 2021/04/24 02:06:28 namespace sandbox: enabled 2021/04/24 02:06:28 Android sandbox: enabled 2021/04/24 02:06:28 fault injection: enabled 2021/04/24 02:06:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/24 02:06:28 net packet injection: /dev/net/tun does not exist 2021/04/24 02:06:28 net device setup: enabled 2021/04/24 02:06:28 concurrency sanitizer: enabled 2021/04/24 02:06:28 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/24 02:06:28 USB emulation: /dev/raw-gadget does not exist 2021/04/24 02:06:28 hci packet injection: /dev/vhci does not exist 2021/04/24 02:06:28 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/04/24 02:06:28 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/04/24 02:06:29 suppressing KCSAN reports in functions: 'do_readlinkat' 'ext4_setattr' 'do_nanosleep' 'dd_has_work' 'step_into' 'copy_page_from_iter' 'n_tty_receive_buf_common' 'xas_clear_mark' 'do_signal_stop' 'tick_nohz_next_event' '__xa_clear_mark' 'ext4_free_inode' 'fast_dput' 'blk_mq_rq_ctx_init' 'ext4_mb_good_group' '__add_to_page_cache_locked' 'shmem_getpage_gfp' 'filemap_flush' 'blk_mq_sched_dispatch_requests' 'ext4_writepages' 'generic_write_end' '__process_echoes' 'ext4_mark_iloc_dirty' '__ext4_new_inode' 'blk_mq_dispatch_rq_list' 2021/04/24 02:06:29 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/24 02:06:29 fetching corpus: 50, signal 11021/14847 (executing program) 2021/04/24 02:06:29 fetching corpus: 100, signal 17196/22760 (executing program) 2021/04/24 02:06:30 fetching corpus: 150, signal 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signal 133765/215042 (executing program) syzkaller login: [ 21.572575][ T1739] ================================================================== [ 21.574400][ T1739] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 21.575943][ T1739] [ 21.576359][ T1739] write to 0xffff888100ccf06c of 4 bytes by task 1738 on cpu 1: [ 21.577440][ T1739] futex_wait_queue_me+0x198/0x260 [ 21.578415][ T1739] futex_wait+0x143/0x430 [ 21.579088][ T1739] do_futex+0x9e8/0x1e10 [ 21.579761][ T1739] __se_sys_futex+0x2a8/0x390 [ 21.580724][ T1739] __x64_sys_futex+0x74/0x80 [ 21.581848][ T1739] do_syscall_64+0x34/0x50 [ 21.582622][ T1739] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 21.583567][ T1739] [ 21.584033][ T1739] read to 0xffff888100ccf06c of 4 bytes by task 1739 on cpu 0: [ 21.585587][ T1739] prepare_signal+0x872/0xd80 [ 21.586254][ T1739] __send_signal+0x64/0x760 [ 21.586979][ T1739] send_signal+0x38e/0x3d0 [ 21.587710][ T1739] do_send_specific+0x13d/0x1c0 [ 21.588461][ T1739] __x64_sys_tgkill+0x108/0x140 [ 21.589411][ T1739] do_syscall_64+0x34/0x50 [ 21.590130][ T1739] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 21.591023][ T1739] [ 21.591487][ T1739] Reported by Kernel Concurrency Sanitizer on: [ 21.592496][ T1739] CPU: 0 PID: 1739 Comm: syz-fuzzer Not tainted 5.12.0-rc8-syzkaller #0 [ 21.599695][ T1739] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.609832][ T1739] ================================================================== 2021/04/24 02:06:32 fetching corpus: 4399, signal 134524/216204 (executing program) 2021/04/24 02:06:32 fetching corpus: 4449, signal 134983/217275 (executing program) 2021/04/24 02:06:32 fetching corpus: 4499, signal 135485/218325 (executing program) 2021/04/24 02:06:32 fetching corpus: 4549, signal 135894/219349 (executing program) 2021/04/24 02:06:32 fetching corpus: 4599, signal 136484/220381 (executing program) 2021/04/24 02:06:32 fetching corpus: 4648, signal 137053/221442 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