[ OK ] Reached target Login Prompts. [ 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 '10.128.1.34' (ECDSA) to the list of known hosts. 2020/09/22 08:34:40 fuzzer started 2020/09/22 08:34:40 connecting to host at 10.128.0.105:32877 2020/09/22 08:34:40 checking machine... 2020/09/22 08:34:40 checking revisions... 2020/09/22 08:34:40 testing simple program... syzkaller login: [ 37.255477] audit: type=1400 audit(1600763680.391:8): avc: denied { execmem } for pid=6378 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 37.309776] IPVS: ftp: loaded support on port[0] = 21 2020/09/22 08:34:40 building call list... [ 37.893493] ================================================================================ [ 37.902227] UBSAN: Undefined behaviour in ./include/crypto/hash.h:686:9 [ 37.908974] member access within null pointer of type 'struct crypto_shash' [ 37.916070] CPU: 1 PID: 36 Comm: kworker/u4:3 Not tainted 4.14.198-syzkaller #0 [ 37.923509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.932874] Workqueue: netns cleanup_net [ 37.936938] Call Trace: [ 37.939534] dump_stack+0x21b/0x32e [ 37.943263] ? dma_virt_alloc+0x82/0x82 [ 37.947238] ? ubsan_prologue+0x29/0x50 [ 37.951237] ubsan_epilogue+0xe/0x3a [ 37.954951] handle_null_ptr_deref+0x78/0x80 [ 37.959359] __ubsan_handle_type_mismatch_v1+0x81/0xb0 [ 37.964663] sctp_destruct_sock+0x70/0x80 [ 37.968809] ? sctp_accept+0x730/0x730 [ 37.972688] __sk_destruct+0x93/0x8e0 [ 37.976484] ? proto_unregister+0x5e0/0x5e0 [ 37.980823] ? mark_held_locks+0xc4/0x120 [ 37.985230] __sk_free+0xf4/0x370 [ 37.988693] sk_free+0x30/0x50 [ 37.991886] sctp_close+0x667/0x940 [ 37.995511] ? sctp_init_sock+0x1430/0x1430 [ 37.999842] ? do_raw_spin_unlock+0x1e0/0x310 [ 38.004352] ? ip_mc_drop_socket+0x16/0x270 [ 38.008672] inet_release+0xfe/0x230 [ 38.012382] inet6_release+0x51/0x80 [ 38.016096] __sock_release+0x236/0x330 [ 38.020072] sctp_ctrlsock_exit+0x67/0x90 [ 38.024211] ops_exit_list+0x9a/0x190 [ 38.028020] cleanup_net+0x4a3/0xd30 [ 38.031728] ? net_drop_ns+0x90/0x90 [ 38.035450] process_one_work+0x7ac/0x1890 [ 38.039686] ? pwq_dec_nr_in_flight+0x360/0x360 [ 38.044356] ? lock_acquire+0x197/0x510 [ 38.048497] ? rwlock_bug.part.0+0xe0/0xe0 [ 38.052726] ? worker_thread+0x1e0/0x1330 [ 38.056871] worker_thread+0x6c1/0x1330 [ 38.060964] ? process_one_work+0x1890/0x1890 [ 38.065471] ? process_one_work+0x1890/0x1890 [ 38.069974] kthread+0x35e/0x530 [ 38.073334] ? kthread_create_on_node+0xd0/0xd0 [ 38.078016] ret_from_fork+0x24/0x30 [ 38.081819] ================================================================================ [ 38.409822] can: request_module (can-proto-0) failed. [ 38.423675] can: request_module (can-proto-0) failed. [ 38.435900] can: request_module (can-proto-0) failed. [ 38.486737] audit: type=1400 audit(1600763681.631:9): avc: denied { create } for pid=6362 comm="syz-fuzzer" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1