[ 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 '10.128.0.100' (ECDSA) to the list of known hosts. 2021/09/05 19:30:23 fuzzer started 2021/09/05 19:30:23 connecting to host at 10.128.0.163:37073 2021/09/05 19:30:23 checking machine... 2021/09/05 19:30:23 checking revisions... 2021/09/05 19:30:23 testing simple program... syzkaller login: [ 18.413609][ T25] audit: type=1400 audit(1630870223.456:8): avc: denied { execmem } for pid=1763 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 18.447295][ T1764] cgroup: Unknown subsys name 'perf_event' [ 18.454018][ T1764] cgroup: Unknown subsys name 'net_cls' [ 18.618110][ T1824] ================================================================== [ 18.626313][ T1824] BUG: KCSAN: data-race in cgroup_rstat_flush_locked / cgroup_rstat_updated [ 18.635089][ T1824] [ 18.637419][ T1824] write to 0xffffe8ffffc19348 of 8 bytes by task 42 on cpu 1: [ 18.644949][ T1824] cgroup_rstat_flush_locked+0x282/0x7f0 [ 18.650916][ T1824] cgroup_rstat_flush_irqsafe+0x24/0x40 [ 18.656532][ T1824] flush_memcg_stats_work+0x34/0x60 [ 18.661710][ T1824] process_one_work+0x402/0x910 [ 18.666537][ T1824] worker_thread+0x636/0xae0 [ 18.671131][ T1824] kthread+0x262/0x280 [ 18.675191][ T1824] ret_from_fork+0x1f/0x30 [ 18.679892][ T1824] [ 18.682293][ T1824] read to 0xffffe8ffffc19348 of 8 bytes by task 1824 on cpu 0: [ 18.690268][ T1824] cgroup_rstat_updated+0x53/0x1c0 [ 18.695492][ T1824] __mod_lruvec_state+0x7c/0xe0 [ 18.700581][ T1824] __mod_lruvec_page_state+0xd2/0x120 [ 18.706333][ T1824] page_add_file_rmap+0x4a/0x60 [ 18.711269][ T1824] do_set_pte+0x268/0x410 [ 18.715602][ T1824] filemap_map_pages+0x51d/0x870 [ 18.720529][ T1824] handle_mm_fault+0xae0/0x1530 [ 18.725505][ T1824] do_user_addr_fault+0x609/0xbe0 [ 18.730663][ T1824] exc_page_fault+0x91/0x220 [ 18.735243][ T1824] asm_exc_page_fault+0x1e/0x30 [ 18.740117][ T1824] [ 18.742418][ T1824] value changed: 0xffff88810115c010 -> 0x0000000000000000 [ 18.749503][ T1824] [ 18.751948][ T1824] Reported by Kernel Concurrency Sanitizer on: [ 18.758072][ T1824] CPU: 0 PID: 1824 Comm: modprobe Not tainted 5.14.0-syzkaller #0 [ 18.766219][ T1824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.776522][ T1824] ================================================================== 2021/09/05 19:30:24 building call list... [ 20.835282][ T25] audit: type=1400 audit(1630870225.876:9): avc: denied { create } for pid=1753 comm="syz-fuzzer" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1