[ 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 '10.128.0.32' (ECDSA) to the list of known hosts. 2021/09/05 19:30:20 fuzzer started 2021/09/05 19:30:21 connecting to host at 10.128.0.163:43551 2021/09/05 19:30:21 checking machine... 2021/09/05 19:30:21 checking revisions... 2021/09/05 19:30:21 testing simple program... syzkaller login: [ 17.698748][ T25] audit: type=1400 audit(1630870221.191:8): avc: denied { execmem } for pid=1790 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 17.733334][ T1791] cgroup: Unknown subsys name 'perf_event' [ 17.740564][ T1791] cgroup: Unknown subsys name 'net_cls' [ 17.788886][ T1799] ================================================================== [ 17.797698][ T1799] BUG: KCSAN: data-race in cgroup_rstat_flush_locked / cgroup_rstat_updated [ 17.806777][ T1799] [ 17.809103][ T1799] write to 0xffffe8ffffc19348 of 8 bytes by task 8 on cpu 1: [ 17.817412][ T1799] cgroup_rstat_flush_locked+0x282/0x7f0 [ 17.823240][ T1799] cgroup_rstat_flush_irqsafe+0x24/0x40 [ 17.829857][ T1799] flush_memcg_stats_work+0x34/0x60 [ 17.835164][ T1799] process_one_work+0x402/0x910 [ 17.840172][ T1799] worker_thread+0x636/0xae0 [ 17.845029][ T1799] kthread+0x262/0x280 [ 17.849458][ T1799] ret_from_fork+0x1f/0x30 [ 17.853871][ T1799] [ 17.856195][ T1799] read to 0xffffe8ffffc19348 of 8 bytes by task 1799 on cpu 0: [ 17.864201][ T1799] cgroup_rstat_updated+0x53/0x1c0 [ 17.869567][ T1799] __mod_lruvec_state+0x7c/0xe0 [ 17.874758][ T1799] __mod_lruvec_page_state+0xd2/0x120 [ 17.880606][ T1799] page_add_new_anon_rmap+0x19e/0x2c0 [ 17.886159][ T1799] wp_page_copy+0x7f3/0x10d0 [ 17.891226][ T1799] do_wp_page+0x5a8/0xba0 [ 17.896185][ T1799] handle_mm_fault+0x946/0x1530 [ 17.901194][ T1799] do_user_addr_fault+0x609/0xbe0 [ 17.906211][ T1799] exc_page_fault+0x91/0x220 [ 17.911009][ T1799] asm_exc_page_fault+0x1e/0x30 [ 17.916052][ T1799] [ 17.918362][ T1799] value changed: 0xffff888100f78010 -> 0x0000000000000000 [ 17.925809][ T1799] [ 17.928135][ T1799] Reported by Kernel Concurrency Sanitizer on: [ 17.934367][ T1799] CPU: 0 PID: 1799 Comm: modprobe Not tainted 5.14.0-syzkaller #0 [ 17.942251][ T1799] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 17.952286][ T1799] ================================================================== 2021/09/05 19:30:22 building call list... [ 20.155751][ T25] audit: type=1400 audit(1630870223.652:9): avc: denied { create } for pid=1780 comm="syz-fuzzer" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1