[ 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 '10.128.1.111' (ECDSA) to the list of known hosts. 2021/09/04 19:09:20 fuzzer started 2021/09/04 19:09:20 connecting to host at 10.128.0.163:37683 2021/09/04 19:09:20 checking machine... 2021/09/04 19:09:20 checking revisions... 2021/09/04 19:09:20 testing simple program... syzkaller login: [ 21.679311][ T25] audit: type=1400 audit(1630782560.258:8): avc: denied { execmem } for pid=1765 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 21.715533][ T1766] cgroup: Unknown subsys name 'perf_event' [ 21.723082][ T1766] cgroup: Unknown subsys name 'net_cls' [ 21.816933][ T1793] ================================================================== [ 21.825462][ T1793] BUG: KCSAN: data-race in cgroup_rstat_flush_locked / cgroup_rstat_updated [ 21.834526][ T1793] [ 21.836838][ T1793] write to 0xffffe8ffffc19460 of 8 bytes by task 306 on cpu 1: [ 21.844653][ T1793] cgroup_rstat_flush_locked+0x282/0x7f0 [ 21.850652][ T1793] cgroup_rstat_flush_irqsafe+0x24/0x40 [ 21.856268][ T1793] flush_memcg_stats_work+0x34/0x60 [ 21.861792][ T1793] process_one_work+0x402/0x910 [ 21.867452][ T1793] worker_thread+0x636/0xae0 [ 21.872145][ T1793] kthread+0x262/0x280 [ 21.876375][ T1793] ret_from_fork+0x1f/0x30 [ 21.880803][ T1793] [ 21.883138][ T1793] read to 0xffffe8ffffc19460 of 8 bytes by task 1793 on cpu 0: [ 21.891185][ T1793] cgroup_rstat_updated+0x53/0x1c0 [ 21.896859][ T1793] __mod_lruvec_state+0x7c/0xe0 [ 21.901916][ T1793] __mod_lruvec_page_state+0xd2/0x120 [ 21.907282][ T1793] page_add_file_rmap+0x4a/0x60 [ 21.912114][ T1793] do_set_pte+0x268/0x410 [ 21.916670][ T1793] filemap_map_pages+0x51d/0x870 [ 21.921897][ T1793] handle_mm_fault+0xae0/0x1530 [ 21.926736][ T1793] do_user_addr_fault+0x609/0xbe0 [ 21.931830][ T1793] exc_page_fault+0x91/0x220 [ 21.937002][ T1793] asm_exc_page_fault+0x1e/0x30 [ 21.942114][ T1793] [ 21.944583][ T1793] value changed: 0xffff888100aca010 -> 0x0000000000000000 [ 21.952281][ T1793] [ 21.954679][ T1793] Reported by Kernel Concurrency Sanitizer on: [ 21.961202][ T1793] CPU: 0 PID: 1793 Comm: modprobe Not tainted 5.14.0-syzkaller #0 [ 21.969421][ T1793] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.980274][ T1793] ================================================================== 2021/09/04 19:09:21 building call list... [ 24.175430][ T25] audit: type=1400 audit(1630782562.759:9): avc: denied { create } for pid=1755 comm="syz-fuzzer" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1