[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.196' (ECDSA) to the list of known hosts. 2020/05/11 08:38:59 fuzzer started 2020/05/11 08:38:59 connecting to host at 10.128.0.26:42671 2020/05/11 08:38:59 checking machine... 2020/05/11 08:38:59 checking revisions... 2020/05/11 08:38:59 testing simple program... syzkaller login: [ 54.062905][ T7035] IPVS: ftp: loaded support on port[0] = 21 2020/05/11 08:38:59 building call list... [ 54.498722][ T6977] tipc: TX() has been purged, node left! [ 55.711694][ T7019] can: request_module (can-proto-0) failed. executing program [ 57.603072][ T7019] can: request_module (can-proto-0) failed. [ 57.614469][ T7019] can: request_module (can-proto-0) failed. [ 58.057463][ T7019] ================================================================== [ 58.065652][ T7019] BUG: KASAN: null-ptr-deref in x25_disconnect+0x253/0x370 [ 58.072867][ T7019] Write of size 4 at addr 00000000000000d8 by task syz-fuzzer/7019 [ 58.080773][ T7019] [ 58.083091][ T7019] CPU: 1 PID: 7019 Comm: syz-fuzzer Not tainted 5.7.0-rc2-syzkaller #0 [ 58.091297][ T7019] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.101368][ T7019] Call Trace: [ 58.104636][ T7019] dump_stack+0x188/0x20d [ 58.108954][ T7019] ? x25_disconnect+0x253/0x370 [ 58.113792][ T7019] ? __sock_release+0x280/0x280 [ 58.118615][ T7019] __kasan_report.cold+0x5/0x4d [ 58.123443][ T7019] ? rcu_read_lock_held+0x1/0xb0 [ 58.128358][ T7019] ? x25_disconnect+0x253/0x370 [ 58.133189][ T7019] ? x25_disconnect+0x253/0x370 [ 58.138014][ T7019] kasan_report+0x33/0x50 [ 58.142328][ T7019] check_memory_region+0x141/0x190 [ 58.147439][ T7019] x25_disconnect+0x253/0x370 [ 58.152098][ T7019] x25_release+0x345/0x420 [ 58.156499][ T7019] __sock_release+0xcd/0x280 [ 58.161090][ T7019] sock_close+0x18/0x20 [ 58.165235][ T7019] __fput+0x33e/0x880 [ 58.169210][ T7019] task_work_run+0xf4/0x1b0 [ 58.173705][ T7019] exit_to_usermode_loop+0x2fa/0x360 [ 58.178972][ T7019] do_syscall_64+0x6b1/0x7d0 [ 58.183541][ T7019] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 58.189406][ T7019] RIP: 0033:0x4afb40 [ 58.193276][ T7019] 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 [ 58.212854][ T7019] RSP: 002b:000000c0001e9478 EFLAGS: 00000212 ORIG_RAX: 0000000000000003 [ 58.221241][ T7019] RAX: 0000000000000000 RBX: 000000c00002c000 RCX: 00000000004afb40 [ 58.229189][ T7019] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 58.237134][ T7019] RBP: 000000c0001e94b8 R08: 0000000000000000 R09: 0000000000000000 [ 58.245090][ T7019] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 58.253035][ T7019] R13: 0000000000000160 R14: 000000000000015f R15: 0000000000000200 [ 58.260992][ T7019] ================================================================== [ 58.269022][ T7019] Disabling lock debugging due to kernel taint [ 58.275201][ T7019] Kernel panic - not syncing: panic_on_warn set ... [ 58.281782][ T7019] CPU: 1 PID: 7019 Comm: syz-fuzzer Tainted: G B 5.7.0-rc2-syzkaller #0 [ 58.291392][ T7019] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.301504][ T7019] Call Trace: [ 58.304867][ T7019] dump_stack+0x188/0x20d [ 58.309171][ T7019] ? __sock_release+0x280/0x280 [ 58.314002][ T7019] panic+0x2e3/0x75c [ 58.317868][ T7019] ? add_taint.cold+0x16/0x16 [ 58.322529][ T7019] ? x25_disconnect+0x253/0x370 [ 58.327360][ T7019] ? trace_hardirqs_on+0x55/0x220 [ 58.332369][ T7019] ? x25_disconnect+0x253/0x370 [ 58.337190][ T7019] ? __sock_release+0x280/0x280 [ 58.342025][ T7019] end_report+0x4d/0x53 [ 58.346158][ T7019] __kasan_report.cold+0xd/0x4d [ 58.350980][ T7019] ? rcu_read_lock_held+0x1/0xb0 [ 58.355905][ T7019] ? x25_disconnect+0x253/0x370 [ 58.360736][ T7019] ? x25_disconnect+0x253/0x370 [ 58.365555][ T7019] kasan_report+0x33/0x50 [ 58.369863][ T7019] check_memory_region+0x141/0x190 [ 58.374945][ T7019] x25_disconnect+0x253/0x370 [ 58.379593][ T7019] x25_release+0x345/0x420 [ 58.383981][ T7019] __sock_release+0xcd/0x280 [ 58.388542][ T7019] sock_close+0x18/0x20 [ 58.392679][ T7019] __fput+0x33e/0x880 [ 58.396633][ T7019] task_work_run+0xf4/0x1b0 [ 58.401113][ T7019] exit_to_usermode_loop+0x2fa/0x360 [ 58.406373][ T7019] do_syscall_64+0x6b1/0x7d0 [ 58.410936][ T7019] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 58.416795][ T7019] RIP: 0033:0x4afb40 [ 58.420672][ T7019] 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 [ 58.440258][ T7019] RSP: 002b:000000c0001e9478 EFLAGS: 00000212 ORIG_RAX: 0000000000000003 [ 58.448637][ T7019] RAX: 0000000000000000 RBX: 000000c00002c000 RCX: 00000000004afb40 [ 58.456581][ T7019] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 58.464522][ T7019] RBP: 000000c0001e94b8 R08: 0000000000000000 R09: 0000000000000000 [ 58.472477][ T7019] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 58.480419][ T7019] R13: 0000000000000160 R14: 000000000000015f R15: 0000000000000200 [ 58.489782][ T7019] Kernel Offset: disabled [ 58.494095][ T7019] Rebooting in 86400 seconds..