[ 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 '10.128.1.23' (ECDSA) to the list of known hosts. 2021/05/09 21:31:54 fuzzer started 2021/05/09 21:31:55 dialing manager at 10.128.0.163:40565 2021/05/09 21:31:56 syscalls: 1982 2021/05/09 21:31:56 code coverage: enabled 2021/05/09 21:31:56 comparison tracing: enabled 2021/05/09 21:31:56 extra coverage: enabled 2021/05/09 21:31:56 setuid sandbox: enabled 2021/05/09 21:31:56 namespace sandbox: enabled 2021/05/09 21:31:56 Android sandbox: enabled 2021/05/09 21:31:56 fault injection: enabled 2021/05/09 21:31:56 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/09 21:31:56 net packet injection: /dev/net/tun does not exist 2021/05/09 21:31:56 net device setup: enabled 2021/05/09 21:31:56 concurrency sanitizer: enabled 2021/05/09 21:31:56 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/09 21:31:56 USB emulation: /dev/raw-gadget does not exist 2021/05/09 21:31:56 hci packet injection: /dev/vhci does not exist 2021/05/09 21:31:56 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/09 21:31:56 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/05/09 21:31:57 suppressing KCSAN reports in functions: 'ext4_writepages' '_find_next_bit' 'fast_dput' 'tick_nohz_next_event' 'generic_write_end' 'blk_mq_dispatch_rq_list' 'ext4_mb_regular_allocator' 'do_nanosleep' 'ext4_free_inodes_count' 'audit_log_start' 'do_readlinkat' 'exit_mm' 'ext4_ext_handle_unwritten_extents' 'shmem_unlink' 'do_signal_stop' 'n_tty_receive_buf_common' 'kauditd_thread' 'expire_timers' '__mark_inode_dirty' 'step_into' 'xas_find_marked' 'blk_mq_rq_ctx_init' 'blk_mq_sched_dispatch_requests' '__xa_clear_mark' '__ext4_update_other_inode_time' 'alloc_pid' 2021/05/09 21:31:57 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/09 21:31:57 fetching corpus: 49, signal 11182/15007 (executing program) 2021/05/09 21:31:57 fetching corpus: 99, signal 18919/24460 (executing program) 2021/05/09 21:31:57 fetching corpus: 149, signal 26032/33196 (executing program) 2021/05/09 21:31:57 fetching corpus: 199, signal 31978/40719 (executing program) 2021/05/09 21:31:57 fetching corpus: 249, signal 38208/48376 (executing program) 2021/05/09 21:31:57 fetching corpus: 299, signal 41569/53270 (executing program) 2021/05/09 21:31:57 fetching corpus: 349, signal 44706/57853 (executing program) 2021/05/09 21:31:57 fetching corpus: 399, signal 49359/63872 (executing program) syzkaller login: [ 22.238270][ T1748] ================================================================== [ 22.240855][ T1748] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 22.242195][ T1748] [ 22.242768][ T1748] write to 0xffff888100cba02c of 4 bytes by task 1745 on cpu 1: [ 22.244513][ T1748] futex_wait_queue_me+0x198/0x260 [ 22.245721][ T1748] futex_wait+0x143/0x430 [ 22.246645][ T1748] do_futex+0x9d8/0x1ee0 [ 22.248050][ T1748] __se_sys_futex+0x21c/0x380 [ 22.249931][ T1748] __x64_sys_futex+0x74/0x80 [ 22.252473][ T1748] do_syscall_64+0x4a/0x90 [ 22.253698][ T1748] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 22.254874][ T1748] [ 22.255525][ T1748] read to 0xffff888100cba02c of 4 bytes by task 1748 on cpu 0: [ 22.257009][ T1748] complete_signal+0x7c/0x600 [ 22.258518][ T1748] __send_signal+0x680/0x760 [ 22.263267][ T1748] send_signal+0x281/0x390 [ 22.267897][ T1748] do_send_specific+0x13d/0x1c0 [ 22.272938][ T1748] __x64_sys_tgkill+0x108/0x140 [ 22.277898][ T1748] do_syscall_64+0x4a/0x90 [ 22.282402][ T1748] entry_SYSCALL_64_after_hwframe+0x44/0xae 2021/05/09 21:31:58 fetching corpus: 449, signal 51274/67233 (executing program) 2021/05/09 21:31:58 fetching corpus: 499, signal 53370/70708 (executing program) 2021/05/09 21:31:58 fetching corpus: 549, signal 55435/74174 (executing program) [ 22.288395][ T1748] [ 22.290788][ T1748] Reported by Kernel Concurrency Sanitizer on: [ 22.296910][ T1748] CPU: 0 PID: 1748 Comm: syz-fuzzer Not tainted 5.12.0-syzkaller #0 [ 22.304884][ T1748] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.315110][ T1748] ================================================================== 2021/05/09 21:31:58 fetching corpus: 599, signal 58543/78528 (executing program) 2021/05/09 21:31:58 fetching corpus: 649, signal 60677/81973 (executing program) 2021/05/09 21:31:58 fetching corpus: 699, signal 62542/85143 (executing program) 2021/05/09 21:31:58 fetching corpus: 749, signal 64843/88713 (executing program) 2021/05/09 21:31:58 fetching corpus: 799, signal 66903/91998 (executing program) 2021/05/09 21:31:58 fetching corpus: 849, signal 68997/95267 (executing program) 2021/05/09 21:31:58 fetching corpus: 899, signal 70689/98196 (executing program) 2021/05/09 21:31:58 fetching corpus: 949, signal 72452/101112 (executing program) 2021/05/09 21:31:58 fetching corpus: 999, signal 74360/104154 (executing program) 2021/05/09 21:31:58 fetching corpus: 1049, signal 76141/107027 (executing program) 2021/05/09 21:31:58 fetching corpus: 1099, signal 77174/109319 (executing program) 2021/05/09 21:31:58 fetching corpus: 1149, signal 80157/113144 (executing program) 2021/05/09 21:31:58 fetching corpus: 1199, signal 81607/115686 (executing program) 2021/05/09 21:31:58 fetching corpus: 1249, signal 83170/118259 (executing program) 2021/05/09 21:31:58 fetching corpus: 1299, signal 84680/120806 (executing program) 2021/05/09 21:31:58 fetching corpus: 1349, signal 86234/123376 (executing program) 2021/05/09 21:31:58 fetching corpus: 1399, signal 87511/125721 (executing program) 2021/05/09 21:31:58 fetching corpus: 1449, signal 89434/128536 (executing program) 2021/05/09 21:31:58 fetching corpus: 1499, signal 91029/131035 (executing program) 2021/05/09 21:31:58 fetching corpus: 1549, signal 92103/133112 (executing program) 2021/05/09 21:31:58 fetching corpus: 1599, signal 93132/135177 (executing program) 2021/05/09 21:31:58 fetching corpus: 1649, signal 94343/137318 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2021/05/09 21:32:00 fetching corpus: 5249, signal 148345/237191 (executing program) 2021/05/09 21:32:00 fetching corpus: 5299, signal 149131/238174 (executing program) 2021/05/09 21:32:00 fetching corpus: 5349, signal 149744/239063 (executing program) 2021/05/09 21:32:00 fetching corpus: 5399, signal 150218/239923 (executing program) 2021/05/09 21:32:00 fetching corpus: 5449, signal 151008/240857 (executing program) 2021/05/09 21:32:00 fetching corpus: 5499, signal 151443/241732 (executing program) 2021/05/09 21:32:01 fetching corpus: 5549, signal 152081/242608 (executing program) [ 25.329283][ T1747] ================================================================== [ 25.338165][ T1747] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 25.346141][ T1747] [ 25.348453][ T1747] write to 0xffff888100cba02c of 4 bytes by task 1745 on cpu 0: [ 25.356055][ T1747] futex_wait_queue_me+0x198/0x260 [ 25.361147][ T1747] futex_wait+0x143/0x430 [ 25.365643][ T1747] do_futex+0x9d8/0x1ee0 [ 25.370044][ T1747] __se_sys_futex+0x21c/0x380 [ 25.374701][ T1747] __x64_sys_futex+0x74/0x80 [ 25.379366][ T1747] do_syscall_64+0x4a/0x90 [ 25.383808][ T1747] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 25.390486][ T1747] [ 25.392883][ T1747] read to 0xffff888100cba02c of 4 bytes by task 1747 on cpu 1: [ 25.401020][ T1747] prepare_signal+0x952/0xeb0 [ 25.406425][ T1747] __send_signal+0x64/0x760 [ 25.410911][ T1747] send_signal+0x281/0x390 [ 25.415320][ T1747] do_send_specific+0x13d/0x1c0 [ 25.420167][ T1747] __x64_sys_tgkill+0x108/0x140 2021/05/09 21:32:01 fetching corpus: 5599, signal 152446/243504 (executing program) 2021/05/09 21:32:01 fetching corpus: 5649, signal 152793/244336 (executing program) [ 25.425360][ T1747] do_syscall_64+0x4a/0x90 [ 25.430661][ T1747] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 25.436788][ T1747] [ 25.439343][ T1747] Reported by Kernel Concurrency Sanitizer on: [ 25.446028][ T1747] CPU: 1 PID: 1747 Comm: syz-fuzzer Not tainted 5.12.0-syzkaller #0 [ 25.454374][ T1747] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.464714][ T1747] ================================================================== 2021/05/09 21:32:01 fetching corpus: 5699, signal 153288/245210 (executing program) 2021/05/09 21:32:01 fetching corpus: 5749, signal 153638/246071 (executing program) 2021/05/09 21:32:01 fetching corpus: 5799, signal 154080/246906 (executing program) 2021/05/09 21:32:01 fetching corpus: 5849, signal 154400/247680 (executing program) 2021/05/09 21:32:01 fetching corpus: 5899, signal 154871/248537 (executing program) 2021/05/09 21:32:01 fetching corpus: 5949, signal 155257/249355 (executing program) 2021/05/09 21:32:01 fetching corpus: 5999, signal 155572/250175 (executing program) 2021/05/09 21:32:01 fetching corpus: 6049, signal 155856/250972 (executing program) 2021/05/09 21:32:01 fetching corpus: 6099, signal 156136/251727 (executing program) 2021/05/09 21:32:01 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(executing program) 2021/05/09 21:32:02 fetching corpus: 8549, signal 176973/255429 (executing program) 2021/05/09 21:32:02 fetching corpus: 8599, signal 177278/255429 (executing program) 2021/05/09 21:32:02 fetching corpus: 8649, signal 177474/255429 (executing program) 2021/05/09 21:32:02 fetching corpus: 8699, signal 177897/255429 (executing program) 2021/05/09 21:32:02 fetching corpus: 8749, signal 178298/255429 (executing program) 2021/05/09 21:32:02 fetching corpus: 8799, signal 178693/255429 (executing program) 2021/05/09 21:32:02 fetching corpus: 8849, signal 179390/255429 (executing program) 2021/05/09 21:32:03 fetching corpus: 8899, signal 179627/255429 (executing program) 2021/05/09 21:32:03 fetching corpus: 8949, signal 179986/255429 (executing program) 2021/05/09 21:32:03 fetching corpus: 8999, signal 180589/255429 (executing program) 2021/05/09 21:32:03 fetching corpus: 9049, signal 181049/255429 (executing program) 2021/05/09 21:32:03 fetching corpus: 9099, signal 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