[ 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 '10.128.0.24' (ECDSA) to the list of known hosts. 2020/09/26 23:16:19 fuzzer started 2020/09/26 23:16:19 connecting to host at 10.128.0.105:40335 2020/09/26 23:16:19 checking machine... 2020/09/26 23:16:19 checking revisions... 2020/09/26 23:16:19 testing simple program... syzkaller login: [ 39.901437] audit: type=1400 audit(1601162179.487:8): avc: denied { execmem } for pid=6386 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 39.955496] IPVS: ftp: loaded support on port[0] = 21 2020/09/26 23:16:19 building call list... [ 40.517950] ================================================================================ [ 40.526675] UBSAN: Undefined behaviour in ./include/crypto/hash.h:686:9 [ 40.533418] member access within null pointer of type 'struct crypto_shash' [ 40.540511] CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.199-syzkaller #0 [ 40.547860] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.557211] Workqueue: netns cleanup_net [ 40.561259] Call Trace: [ 40.563925] dump_stack+0x21b/0x32e [ 40.567548] ? dma_virt_alloc+0x82/0x82 [ 40.571514] ? ubsan_prologue+0x29/0x50 [ 40.575486] ubsan_epilogue+0xe/0x3a [ 40.579193] handle_null_ptr_deref+0x78/0x80 [ 40.583594] __ubsan_handle_type_mismatch_v1+0x81/0xb0 [ 40.588868] sctp_destruct_sock+0x70/0x80 [ 40.593008] ? sctp_accept+0x730/0x730 [ 40.596887] __sk_destruct+0x93/0x8e0 [ 40.600679] ? proto_unregister+0x5e0/0x5e0 [ 40.604993] ? mark_held_locks+0xc4/0x120 [ 40.609149] __sk_free+0xf4/0x370 [ 40.612594] sk_free+0x30/0x50 [ 40.615782] sctp_close+0x667/0x940 [ 40.619415] ? sctp_init_sock+0x1430/0x1430 [ 40.623730] ? do_raw_spin_unlock+0x1e0/0x310 [ 40.628225] ? ip_mc_drop_socket+0x16/0x270 [ 40.632538] inet_release+0xfe/0x230 [ 40.636249] inet6_release+0x51/0x80 [ 40.639955] __sock_release+0x236/0x330 [ 40.643923] sctp_ctrlsock_exit+0x67/0x90 [ 40.648088] ops_exit_list+0x9a/0x190 [ 40.651883] cleanup_net+0x4a3/0xd30 [ 40.655593] ? net_drop_ns+0x90/0x90 [ 40.659310] process_one_work+0x7ac/0x1890 [ 40.663544] ? pwq_dec_nr_in_flight+0x360/0x360 [ 40.668211] ? lock_acquire+0x197/0x510 [ 40.672176] ? rwlock_bug.part.0+0xe0/0xe0 [ 40.676406] ? worker_thread+0x1e0/0x1330 [ 40.680551] worker_thread+0x6c1/0x1330 [ 40.684533] ? process_one_work+0x1890/0x1890 [ 40.689023] ? process_one_work+0x1890/0x1890 [ 40.693685] kthread+0x35e/0x530 [ 40.697104] ? kthread_create_on_node+0xd0/0xd0 [ 40.701769] ret_from_fork+0x24/0x30 [ 40.705484] ================================================================================ [ 41.054165] can: request_module (can-proto-0) failed. [ 41.067733] can: request_module (can-proto-0) failed. [ 41.081175] can: request_module (can-proto-0) failed. [ 41.132897] audit: type=1400 audit(1601162180.718:9): avc: denied { create } for pid=6370 comm="syz-fuzzer" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1