[ 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 '10.128.0.211' (ECDSA) to the list of known hosts. 2020/04/27 21:24:48 fuzzer started 2020/04/27 21:24:50 connecting to host at 10.128.0.26:42209 2020/04/27 21:24:50 checking machine... 2020/04/27 21:24:50 checking revisions... 2020/04/27 21:24:50 testing simple program... syzkaller login: [ 55.693127][ T7034] IPVS: ftp: loaded support on port[0] = 21 2020/04/27 21:24:50 building call list... [ 56.054050][ T169] tipc: TX() has been purged, node left! [ 57.205147][ T7015] can: request_module (can-proto-0) failed. executing program [ 59.216431][ T7015] can: request_module (can-proto-0) failed. [ 59.227932][ T7015] can: request_module (can-proto-0) failed. [ 59.662652][ T7015] ================================================================== [ 59.670848][ T7015] BUG: KASAN: null-ptr-deref in x25_disconnect+0x253/0x370 [ 59.678024][ T7015] Write of size 4 at addr 00000000000000d8 by task syz-fuzzer/7015 [ 59.685902][ T7015] [ 59.688214][ T7015] CPU: 1 PID: 7015 Comm: syz-fuzzer Not tainted 5.7.0-rc2-syzkaller #0 [ 59.696423][ T7015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.706452][ T7015] Call Trace: [ 59.709742][ T7015] dump_stack+0x188/0x20d [ 59.714063][ T7015] ? x25_disconnect+0x253/0x370 [ 59.718918][ T7015] ? __sock_release+0x280/0x280 [ 59.723745][ T7015] __kasan_report.cold+0x5/0x4d [ 59.728587][ T7015] ? rcu_read_lock_held+0x1/0xb0 [ 59.733501][ T7015] ? x25_disconnect+0x253/0x370 [ 59.738329][ T7015] ? x25_disconnect+0x253/0x370 [ 59.743161][ T7015] kasan_report+0x33/0x50 [ 59.747497][ T7015] check_memory_region+0x141/0x190 [ 59.752598][ T7015] x25_disconnect+0x253/0x370 [ 59.757253][ T7015] x25_release+0x345/0x420 [ 59.761663][ T7015] __sock_release+0xcd/0x280 [ 59.766249][ T7015] sock_close+0x18/0x20 [ 59.770382][ T7015] __fput+0x33e/0x880 [ 59.774343][ T7015] task_work_run+0xf4/0x1b0 [ 59.778826][ T7015] exit_to_usermode_loop+0x2fa/0x360 [ 59.784090][ T7015] do_syscall_64+0x6b1/0x7d0 [ 59.788676][ T7015] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.794605][ T7015] RIP: 0033:0x4afb40 [ 59.798489][ T7015] 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 [ 59.818176][ T7015] RSP: 002b:000000c0001b74f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000003 [ 59.826577][ T7015] RAX: 0000000000000000 RBX: 000000c00002e500 RCX: 00000000004afb40 [ 59.834540][ T7015] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 59.842487][ T7015] RBP: 000000c0001b7538 R08: 0000000000000000 R09: 0000000000000000 [ 59.850448][ T7015] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 59.858410][ T7015] R13: 0000000000000163 R14: 0000000000000162 R15: 0000000000000200 [ 59.866398][ T7015] ================================================================== [ 59.874431][ T7015] Disabling lock debugging due to kernel taint [ 59.880627][ T7015] Kernel panic - not syncing: panic_on_warn set ... [ 59.887211][ T7015] CPU: 1 PID: 7015 Comm: syz-fuzzer Tainted: G B 5.7.0-rc2-syzkaller #0 [ 59.896835][ T7015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.906864][ T7015] Call Trace: [ 59.910150][ T7015] dump_stack+0x188/0x20d [ 59.914474][ T7015] ? __sock_release+0x280/0x280 [ 59.919322][ T7015] panic+0x2e3/0x75c [ 59.923285][ T7015] ? add_taint.cold+0x16/0x16 [ 59.927934][ T7015] ? x25_disconnect+0x253/0x370 [ 59.932759][ T7015] ? trace_hardirqs_on+0x55/0x220 [ 59.937779][ T7015] ? x25_disconnect+0x253/0x370 [ 59.942602][ T7015] ? __sock_release+0x280/0x280 [ 59.947444][ T7015] end_report+0x4d/0x53 [ 59.951573][ T7015] __kasan_report.cold+0xd/0x4d [ 59.956416][ T7015] ? rcu_read_lock_held+0x1/0xb0 [ 59.961324][ T7015] ? x25_disconnect+0x253/0x370 [ 59.966149][ T7015] ? x25_disconnect+0x253/0x370 [ 59.970966][ T7015] kasan_report+0x33/0x50 [ 59.975269][ T7015] check_memory_region+0x141/0x190 [ 59.980368][ T7015] x25_disconnect+0x253/0x370 [ 59.985019][ T7015] x25_release+0x345/0x420 [ 59.989427][ T7015] __sock_release+0xcd/0x280 [ 59.994008][ T7015] sock_close+0x18/0x20 [ 59.998137][ T7015] __fput+0x33e/0x880 [ 60.002092][ T7015] task_work_run+0xf4/0x1b0 [ 60.006570][ T7015] exit_to_usermode_loop+0x2fa/0x360 [ 60.011825][ T7015] do_syscall_64+0x6b1/0x7d0 [ 60.016477][ T7015] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 60.022342][ T7015] RIP: 0033:0x4afb40 [ 60.026211][ T7015] 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 [ 60.045784][ T7015] RSP: 002b:000000c0001b74f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000003 [ 60.054175][ T7015] RAX: 0000000000000000 RBX: 000000c00002e500 RCX: 00000000004afb40 [ 60.062131][ T7015] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 60.070082][ T7015] RBP: 000000c0001b7538 R08: 0000000000000000 R09: 0000000000000000 [ 60.078071][ T7015] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 60.086029][ T7015] R13: 0000000000000163 R14: 0000000000000162 R15: 0000000000000200 [ 60.095288][ T7015] Kernel Offset: disabled [ 60.099605][ T7015] Rebooting in 86400 seconds..