[ 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 '10.128.0.77' (ECDSA) to the list of known hosts. 2021/05/12 19:21:24 fuzzer started 2021/05/12 19:21:24 dialing manager at 10.128.0.163:37673 2021/05/12 19:21:25 syscalls: 1982 2021/05/12 19:21:25 code coverage: enabled 2021/05/12 19:21:25 comparison tracing: enabled 2021/05/12 19:21:25 extra coverage: enabled 2021/05/12 19:21:25 setuid sandbox: enabled 2021/05/12 19:21:25 namespace sandbox: enabled 2021/05/12 19:21:25 Android sandbox: enabled 2021/05/12 19:21:25 fault injection: enabled 2021/05/12 19:21:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/12 19:21:25 net packet injection: /dev/net/tun does not exist 2021/05/12 19:21:25 net device setup: enabled 2021/05/12 19:21:25 concurrency sanitizer: enabled 2021/05/12 19:21:25 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/12 19:21:25 USB emulation: /dev/raw-gadget does not exist 2021/05/12 19:21:25 hci packet injection: /dev/vhci does not exist 2021/05/12 19:21:25 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/12 19:21:25 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/05/12 19:21:26 suppressing KCSAN reports in functions: 'kauditd_thread' 'blk_mq_rq_ctx_init' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' '__xa_clear_mark' 'generic_write_end' 'do_signal_stop' '__io_cqring_fill_event' '_find_next_bit' 'handle_irq_event' 'blk_mq_dispatch_rq_list' 'ext4_free_inodes_count' 'ext4_writepages' '__dentry_kill' '__mark_inode_dirty' 'exit_mm' 'n_tty_receive_buf_common' 'get_signal' 'ext4_setattr' '__process_echoes' '__add_to_page_cache_locked' 'lookup_fast' 2021/05/12 19:21:26 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/12 19:21:26 fetching corpus: 49, signal 14343/18063 (executing program) 2021/05/12 19:21:26 fetching corpus: 99, signal 20184/25627 (executing program) 2021/05/12 19:21:26 fetching corpus: 149, signal 28720/35641 (executing 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19:21:32 fetching corpus: 7945, signal 176160/213921 (executing program) 2021/05/12 19:21:32 fetching corpus: 7995, signal 176494/213925 (executing program) 2021/05/12 19:21:32 fetching corpus: 8045, signal 176967/213925 (executing program) 2021/05/12 19:21:32 fetching corpus: 8095, signal 177237/213925 (executing program) syzkaller login: [ 26.099440][ T1768] ================================================================== [ 26.101581][ T1768] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 26.102777][ T1768] [ 26.103408][ T1768] write to 0xffff88810552c02c of 4 bytes by task 1770 on cpu 1: [ 26.105728][ T1768] futex_wait_queue_me+0x198/0x260 [ 26.106970][ T1768] futex_wait+0x143/0x430 [ 26.107753][ T1768] do_futex+0x9d8/0x1ee0 [ 26.108812][ T1768] __se_sys_futex+0x21c/0x380 [ 26.111113][ T1768] __x64_sys_futex+0x74/0x80 [ 26.112170][ T1768] do_syscall_64+0x4a/0x90 [ 26.113877][ T1768] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 26.115627][ T1768] [ 26.116508][ T1768] read to 0xffff88810552c02c of 4 bytes by task 1768 on cpu 0: [ 26.118052][ T1768] prepare_signal+0x952/0xeb0 [ 26.119393][ T1768] __send_signal+0x64/0x760 [ 26.124519][ T1768] send_signal+0x281/0x390 [ 26.129108][ T1768] do_send_specific+0x13d/0x1c0 [ 26.134361][ T1768] __x64_sys_tgkill+0x108/0x140 [ 26.139661][ T1768] do_syscall_64+0x4a/0x90 2021/05/12 19:21:32 fetching corpus: 8145, signal 177519/213938 (executing program) 2021/05/12 19:21:32 fetching corpus: 8194, signal 177852/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8244, signal 178182/213966 (executing program) [ 26.144158][ T1768] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 26.150674][ T1768] [ 26.153428][ T1768] Reported by Kernel Concurrency Sanitizer on: [ 26.160338][ T1768] CPU: 0 PID: 1768 Comm: syz-fuzzer Not tainted 5.13.0-rc1-syzkaller #0 [ 26.169634][ T1768] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.180372][ T1768] ================================================================== 2021/05/12 19:21:32 fetching corpus: 8294, signal 178536/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8344, signal 178820/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8394, signal 179111/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8444, signal 179375/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8494, signal 179650/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8544, signal 179937/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8594, signal 180395/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8644, signal 180683/213966 (executing program) 2021/05/12 19:21:32 fetching corpus: 8694, signal 180997/213969 (executing program) 2021/05/12 19:21:32 fetching corpus: 8744, signal 181346/213969 (executing program) 2021/05/12 19:21:32 fetching corpus: 8794, signal 181626/213970 (executing program) 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&(0x7f0000001780)) 19:21:37 executing program 2: r0 = openat(0xffffffffffffff9c, &(0x7f0000000000)='/proc/self/exe\x00', 0x0, 0x0) mmap(&(0x7f0000000000/0x800000)=nil, 0x800000, 0x1800003, 0x12, r0, 0x0) preadv(r0, &(0x7f0000000280), 0x18, 0xd9f, 0x0) clone(0x100, 0x0, 0xfffffffffffffffe, 0x0, 0xffffffffffffffff) r1 = gettid() wait4(0x0, 0x0, 0x80000002, 0x0) vmsplice(0xffffffffffffffff, &(0x7f00000000c0)=[{0x0}, {0x0}, {0x0}, {&(0x7f0000000300)="66530700aeb097eaa769be6d050000000000006c060f3422831c047dd163b72e4d0fd544c69cd9f43e67aa3b53bb8b346509b02795d6124d1dca94d72749e37e933c468a6d9420c9540e81e189fb877c34eeff436c0c6bcf88bdd1e6879aa747fcfd8cf097ab", 0x66}], 0x4, 0x0) ptrace$setopts(0x4206, r1, 0x0, 0x0) tkill(r1, 0x2d) ptrace$cont(0x18, r1, 0x0, 0x0) ptrace$setregs(0xd, r1, 0x0, &(0x7f0000000080)) ptrace$cont(0x1f, r1, 0x0, 0x0) 19:21:37 executing program 3: socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000000)={0xffffffffffffffff, 0xffffffffffffffff}) setsockopt$SO_ATTACH_FILTER(r1, 0x1, 0x1a, &(0x7f0000ab9ff0)={0x3, &(0x7f0000000040)=[{0x20, 0x0, 0x0, 0xfffff00c}, {0x20, 0x0, 0x0, 0xfffff024}, {0x6}]}, 0x10) sendto(r0, &(0x7f0000000080)="146a7a76", 0x4, 0x0, 0x0, 0x0) 19:21:37 executing program 5: socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000200)={0x0, 0x0}) r1 = syz_open_procfs(0x0, &(0x7f0000000080)='attr\x00') fchdir(r1) sendmmsg(r0, &(0x7f0000008600)=[{{0x0, 0x0, &(0x7f0000003140)}}, {{&(0x7f00000072c0)=@un=@file={0x1, './file0\x00'}, 0xa, &(0x7f0000007380), 0x0, &(0x7f0000000600)}}], 0x2, 0x0) 19:21:37 executing program 4: r0 = socket$inet_tcp(0x2, 0x1, 0x0) ioctl$SIOCGSTAMPNS(r0, 0x8907, 0x0) [ 31.575168][ T25] audit: type=1400 audit(1620847297.856:8): avc: denied { execmem } for pid=1785 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 31.679156][ T1791] cgroup: Unknown subsys name 'perf_event' [ 31.694478][ T1791] cgroup: Unknown subsys name 'net_cls' [ 31.722148][ T1793] cgroup: Unknown subsys name 'perf_event' [ 31.728818][ T1793] cgroup: Unknown subsys name 'net_cls' [ 31.750715][ T1795] cgroup: Unknown subsys name 'perf_event' [ 31.762320][ T1795] cgroup: Unknown subsys name 'net_cls' [ 31.783131][ T1799] cgroup: Unknown subsys name 'perf_event' [ 31.786161][ T1806] cgroup: Unknown subsys name 'perf_event' [ 31.794449][ T1802] cgroup: Unknown subsys name 'perf_event' [ 31.802605][ T1802] cgroup: Unknown subsys name 'net_cls' [ 31.809154][ T1806] cgroup: Unknown subsys name 'net_cls' [ 31.809178][ T1799] cgroup: Unknown subsys name 'net_cls' 19:21:42 executing program 0: seccomp$SECCOMP_SET_MODE_FILTER_LISTENER(0x1, 0x0, &(0x7f0000000000)={0x5, &(0x7f0000000080)=[{0x45, 0x0, 0xef}, {}, {}, {}, {}]}) 19:21:42 executing program 0: seccomp$SECCOMP_SET_MODE_FILTER_LISTENER(0x1, 0x0, &(0x7f0000000000)={0x5, &(0x7f0000000080)=[{0x45, 0x0, 0xef}, {}, {}, {}, {}]}) 19:21:42 executing program 0: seccomp$SECCOMP_SET_MODE_FILTER_LISTENER(0x1, 0x0, &(0x7f0000000000)={0x5, &(0x7f0000000080)=[{0x45, 0x0, 0xef}, {}, {}, {}, {}]}) 19:21:42 executing program 0: r0 = syz_io_uring_setup(0x59ac, &(0x7f00000009c0), &(0x7f0000ffd000/0x3000)=nil, &(0x7f0000ffe000/0x2000)=nil, &(0x7f0000000a40), &(0x7f0000000000)) io_uring_register$IORING_REGISTER_BUFFERS(r0, 0x0, &(0x7f00000001c0)=[{0x0}], 0x1) io_uring_register$IORING_REGISTER_BUFFERS(r0, 0x0, 0x0, 0x0) 19:21:42 executing program 5: socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000200)={0x0, 0x0}) r1 = syz_open_procfs(0x0, &(0x7f0000000080)='attr\x00') fchdir(r1) sendmmsg(r0, &(0x7f0000008600)=[{{0x0, 0x0, &(0x7f0000003140)}}, {{&(0x7f00000072c0)=@un=@file={0x1, './file0\x00'}, 0xa, &(0x7f0000007380), 0x0, &(0x7f0000000600)}}], 0x2, 0x0) 19:21:42 executing program 0: r0 = syz_io_uring_setup(0x59ac, &(0x7f00000009c0), &(0x7f0000ffd000/0x3000)=nil, &(0x7f0000ffe000/0x2000)=nil, &(0x7f0000000a40), &(0x7f0000000000)) io_uring_register$IORING_REGISTER_BUFFERS(r0, 0x0, &(0x7f00000001c0)=[{0x0}], 0x1) io_uring_register$IORING_REGISTER_BUFFERS(r0, 0x0, 0x0, 0x0) 19:21:42 executing program 4: r0 = syz_io_uring_setup(0x59ac, &(0x7f00000009c0), &(0x7f0000ffd000/0x3000)=nil, &(0x7f0000ffe000/0x2000)=nil, &(0x7f0000000a40), &(0x7f0000000000)) io_uring_register$IORING_REGISTER_BUFFERS(r0, 0x0, &(0x7f00000001c0)=[{0x0}], 0x1) io_uring_register$IORING_REGISTER_BUFFERS(r0, 0x0, 0x0, 0x0) 19:21:42 executing program 1: syz_mount_image$nfs(&(0x7f00000002c0), &(0x7f0000000300)='./file0\x00', 0x0, 0x0, 0x0, 0x15863, &(0x7f0000001780))