[ 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 '10.128.1.32' (ECDSA) to the list of known hosts. 2020/09/21 20:10:48 fuzzer started 2020/09/21 20:10:49 connecting to host at 10.128.0.105:44469 2020/09/21 20:10:49 checking machine... 2020/09/21 20:10:49 checking revisions... 2020/09/21 20:10:49 testing simple program... syzkaller login: [ 39.579345] audit: type=1400 audit(1600719049.222:8): avc: denied { execmem } for pid=6372 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 39.642135] IPVS: ftp: loaded support on port[0] = 21 2020/09/21 20:10:49 building call list... [ 40.247275] ================================================================================ [ 40.256012] UBSAN: Undefined behaviour in ./include/crypto/hash.h:686:9 [ 40.262761] member access within null pointer of type 'struct crypto_shash' [ 40.269865] CPU: 0 PID: 2966 Comm: kworker/u4:5 Not tainted 4.14.198-syzkaller #0 [ 40.277492] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.286855] Workqueue: netns cleanup_net [ 40.290936] Call Trace: [ 40.294321] dump_stack+0x21b/0x32e [ 40.297951] ? dma_virt_alloc+0x82/0x82 [ 40.301917] ? ubsan_prologue+0x29/0x50 [ 40.305912] ubsan_epilogue+0xe/0x3a [ 40.309619] handle_null_ptr_deref+0x78/0x80 [ 40.314282] __ubsan_handle_type_mismatch_v1+0x81/0xb0 [ 40.319645] sctp_destruct_sock+0x70/0x80 [ 40.323789] ? sctp_accept+0x730/0x730 [ 40.327674] __sk_destruct+0x93/0x8e0 [ 40.331477] ? proto_unregister+0x5e0/0x5e0 [ 40.335800] ? mark_held_locks+0xc4/0x120 [ 40.339942] __sk_free+0xf4/0x370 [ 40.344257] sk_free+0x30/0x50 [ 40.347451] sctp_close+0x667/0x940 [ 40.351083] ? sctp_init_sock+0x1430/0x1430 [ 40.355416] ? do_raw_spin_unlock+0x1e0/0x310 [ 40.359931] ? ip_mc_drop_socket+0x16/0x270 [ 40.364249] inet_release+0xfe/0x230 [ 40.367978] inet6_release+0x51/0x80 [ 40.371688] __sock_release+0x236/0x330 [ 40.375660] sctp_ctrlsock_exit+0x67/0x90 [ 40.379802] ops_exit_list+0x9a/0x190 [ 40.383597] cleanup_net+0x4a3/0xd30 [ 40.387307] ? net_drop_ns+0x90/0x90 [ 40.391032] process_one_work+0x7ac/0x1890 [ 40.395359] ? pwq_dec_nr_in_flight+0x360/0x360 [ 40.400027] ? lock_acquire+0x197/0x510 [ 40.404084] ? rwlock_bug.part.0+0xe0/0xe0 [ 40.408333] ? worker_thread+0x1e0/0x1330 [ 40.412496] worker_thread+0x6c1/0x1330 [ 40.416484] ? process_one_work+0x1890/0x1890 [ 40.420989] ? process_one_work+0x1890/0x1890 [ 40.425487] kthread+0x35e/0x530 [ 40.428851] ? kthread_create_on_node+0xd0/0xd0 [ 40.433517] ret_from_fork+0x24/0x30 [ 40.437236] ================================================================================ [ 40.721453] can: request_module (can-proto-0) failed. [ 40.734997] can: request_module (can-proto-0) failed. [ 40.747353] can: request_module (can-proto-0) failed. [ 40.798112] audit: type=1400 audit(1600719050.442:9): avc: denied { create } for pid=6355 comm="syz-fuzzer" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1