[ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. 2020/05/03 14:33:51 fuzzer started 2020/05/03 14:33:51 connecting to host at 10.128.0.26:35663 2020/05/03 14:33:51 checking machine... 2020/05/03 14:33:51 checking revisions... 2020/05/03 14:33:51 testing simple program... syzkaller login: [ 55.466013][ T7052] IPVS: ftp: loaded support on port[0] = 21 2020/05/03 14:33:52 building call list... [ 55.852042][ T55] tipc: TX() has been purged, node left! [ 57.090766][ T7035] can: request_module (can-proto-0) failed. executing program [ 59.108298][ T7035] can: request_module (can-proto-0) failed. [ 59.120140][ T7035] can: request_module (can-proto-0) failed. [ 59.601822][ T7035] ================================================================== [ 59.609998][ T7035] BUG: KASAN: null-ptr-deref in x25_disconnect+0x253/0x370 [ 59.617705][ T7035] Write of size 4 at addr 00000000000000d8 by task syz-fuzzer/7035 [ 59.626225][ T7035] [ 59.628639][ T7035] CPU: 0 PID: 7035 Comm: syz-fuzzer Not tainted 5.7.0-rc2-syzkaller #0 [ 59.637125][ T7035] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.647172][ T7035] Call Trace: [ 59.650516][ T7035] dump_stack+0x188/0x20d [ 59.654827][ T7035] ? x25_disconnect+0x253/0x370 [ 59.659655][ T7035] ? __sock_release+0x280/0x280 [ 59.664493][ T7035] __kasan_report.cold+0x5/0x4d [ 59.669340][ T7035] ? rcu_read_lock_held+0x1/0xb0 [ 59.674261][ T7035] ? x25_disconnect+0x253/0x370 [ 59.679140][ T7035] ? x25_disconnect+0x253/0x370 [ 59.683979][ T7035] kasan_report+0x33/0x50 [ 59.688477][ T7035] check_memory_region+0x141/0x190 [ 59.693792][ T7035] x25_disconnect+0x253/0x370 [ 59.698983][ T7035] x25_release+0x345/0x420 [ 59.705209][ T7035] __sock_release+0xcd/0x280 [ 59.710132][ T7035] sock_close+0x18/0x20 [ 59.714288][ T7035] __fput+0x33e/0x880 [ 59.718703][ T7035] task_work_run+0xf4/0x1b0 [ 59.723201][ T7035] exit_to_usermode_loop+0x2fa/0x360 [ 59.728470][ T7035] do_syscall_64+0x6b1/0x7d0 [ 59.733047][ T7035] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.738929][ T7035] RIP: 0033:0x4afb40 [ 59.742803][ T7035] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 59.762497][ T7035] RSP: 002b:000000c0001f14f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000003 [ 59.771428][ T7035] RAX: 0000000000000000 RBX: 000000c00002e500 RCX: 00000000004afb40 [ 59.779378][ T7035] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 59.787419][ T7035] RBP: 000000c0001f1538 R08: 0000000000000000 R09: 0000000000000000 [ 59.795375][ T7035] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 59.803332][ T7035] R13: 0000000000000161 R14: 0000000000000160 R15: 0000000000000200 [ 59.811384][ T7035] ================================================================== [ 59.820302][ T7035] Disabling lock debugging due to kernel taint [ 59.826504][ T7035] Kernel panic - not syncing: panic_on_warn set ... [ 59.833176][ T7035] CPU: 0 PID: 7035 Comm: syz-fuzzer Tainted: G B 5.7.0-rc2-syzkaller #0 [ 59.842786][ T7035] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.852824][ T7035] Call Trace: [ 59.856497][ T7035] dump_stack+0x188/0x20d [ 59.861108][ T7035] ? __sock_release+0x280/0x280 [ 59.865952][ T7035] panic+0x2e3/0x75c [ 59.869908][ T7035] ? add_taint.cold+0x16/0x16 [ 59.874593][ T7035] ? x25_disconnect+0x253/0x370 [ 59.879438][ T7035] ? trace_hardirqs_on+0x55/0x220 [ 59.885155][ T7035] ? x25_disconnect+0x253/0x370 [ 59.890019][ T7035] ? __sock_release+0x280/0x280 [ 59.894981][ T7035] end_report+0x4d/0x53 [ 59.899246][ T7035] __kasan_report.cold+0xd/0x4d [ 59.904532][ T7035] ? rcu_read_lock_held+0x1/0xb0 [ 59.911240][ T7035] ? x25_disconnect+0x253/0x370 [ 59.916305][ T7035] ? x25_disconnect+0x253/0x370 [ 59.921145][ T7035] kasan_report+0x33/0x50 [ 59.925569][ T7035] check_memory_region+0x141/0x190 [ 59.930669][ T7035] x25_disconnect+0x253/0x370 [ 59.935504][ T7035] x25_release+0x345/0x420 [ 59.939917][ T7035] __sock_release+0xcd/0x280 [ 59.944499][ T7035] sock_close+0x18/0x20 [ 59.948663][ T7035] __fput+0x33e/0x880 [ 59.952647][ T7035] task_work_run+0xf4/0x1b0 [ 59.957134][ T7035] exit_to_usermode_loop+0x2fa/0x360 [ 59.962403][ T7035] do_syscall_64+0x6b1/0x7d0 [ 59.967230][ T7035] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.973220][ T7035] RIP: 0033:0x4afb40 [ 59.977200][ T7035] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 59.998640][ T7035] RSP: 002b:000000c0001f14f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000003 [ 60.008138][ T7035] RAX: 0000000000000000 RBX: 000000c00002e500 RCX: 00000000004afb40 [ 60.016721][ T7035] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 60.024691][ T7035] RBP: 000000c0001f1538 R08: 0000000000000000 R09: 0000000000000000 [ 60.032755][ T7035] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 60.041035][ T7035] R13: 0000000000000161 R14: 0000000000000160 R15: 0000000000000200 [ 60.050490][ T7035] Kernel Offset: disabled [ 60.054840][ T7035] Rebooting in 86400 seconds..