Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.76' (ECDSA) to the list of known hosts. 2020/04/28 12:13:00 fuzzer started 2020/04/28 12:13:01 connecting to host at 10.128.0.26:43349 2020/04/28 12:13:01 checking machine... 2020/04/28 12:13:01 checking revisions... 2020/04/28 12:13:01 testing simple program... syzkaller login: [ 61.895244][ T7056] IPVS: ftp: loaded support on port[0] = 21 2020/04/28 12:13:02 building call list... [ 62.268702][ T7] tipc: TX() has been purged, node left! [ 63.757080][ T7042] can: request_module (can-proto-0) failed. executing program [ 65.444204][ T7042] can: request_module (can-proto-0) failed. [ 65.457125][ T7042] can: request_module (can-proto-0) failed. [ 65.967911][ T7042] ================================================================== [ 65.976220][ T7042] BUG: KASAN: null-ptr-deref in x25_disconnect+0x253/0x370 [ 65.984324][ T7042] Write of size 4 at addr 00000000000000d8 by task syz-fuzzer/7042 [ 65.992476][ T7042] [ 65.994824][ T7042] CPU: 0 PID: 7042 Comm: syz-fuzzer Not tainted 5.7.0-rc2-syzkaller #0 [ 66.003265][ T7042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.013691][ T7042] Call Trace: [ 66.017600][ T7042] dump_stack+0x188/0x20d [ 66.022249][ T7042] ? x25_disconnect+0x253/0x370 [ 66.027205][ T7042] ? __sock_release+0x280/0x280 [ 66.032306][ T7042] __kasan_report.cold+0x5/0x4d [ 66.037317][ T7042] ? rcu_read_lock_held+0x1/0xb0 [ 66.042638][ T7042] ? x25_disconnect+0x253/0x370 [ 66.047742][ T7042] ? x25_disconnect+0x253/0x370 [ 66.052586][ T7042] kasan_report+0x33/0x50 [ 66.057012][ T7042] check_memory_region+0x141/0x190 [ 66.062759][ T7042] x25_disconnect+0x253/0x370 [ 66.067968][ T7042] x25_release+0x345/0x420 [ 66.072487][ T7042] __sock_release+0xcd/0x280 [ 66.077228][ T7042] sock_close+0x18/0x20 [ 66.081399][ T7042] __fput+0x33e/0x880 [ 66.085733][ T7042] task_work_run+0xf4/0x1b0 [ 66.090221][ T7042] exit_to_usermode_loop+0x2fa/0x360 [ 66.095703][ T7042] do_syscall_64+0x6b1/0x7d0 [ 66.100377][ T7042] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 66.106564][ T7042] RIP: 0033:0x4afb40 [ 66.110538][ T7042] 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 [ 66.130947][ T7042] RSP: 002b:000000c0000754f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000003 [ 66.140191][ T7042] RAX: 0000000000000000 RBX: 000000c00002c000 RCX: 00000000004afb40 [ 66.149340][ T7042] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 66.158765][ T7042] RBP: 000000c000075538 R08: 0000000000000000 R09: 0000000000000000 [ 66.167176][ T7042] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 66.175225][ T7042] R13: 0000000000000162 R14: 0000000000000161 R15: 0000000000000200 [ 66.183861][ T7042] ================================================================== [ 66.192273][ T7042] Disabling lock debugging due to kernel taint [ 66.198761][ T7042] Kernel panic - not syncing: panic_on_warn set ... [ 66.205381][ T7042] CPU: 0 PID: 7042 Comm: syz-fuzzer Tainted: G B 5.7.0-rc2-syzkaller #0 [ 66.215189][ T7042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.225758][ T7042] Call Trace: [ 66.229231][ T7042] dump_stack+0x188/0x20d [ 66.233554][ T7042] ? __sock_release+0x280/0x280 [ 66.238422][ T7042] panic+0x2e3/0x75c [ 66.242550][ T7042] ? add_taint.cold+0x16/0x16 [ 66.247395][ T7042] ? x25_disconnect+0x253/0x370 [ 66.252351][ T7042] ? trace_hardirqs_on+0x55/0x220 [ 66.257966][ T7042] ? x25_disconnect+0x253/0x370 [ 66.262798][ T7042] ? __sock_release+0x280/0x280 [ 66.268157][ T7042] end_report+0x4d/0x53 [ 66.272382][ T7042] __kasan_report.cold+0xd/0x4d [ 66.277589][ T7042] ? rcu_read_lock_held+0x1/0xb0 [ 66.282603][ T7042] ? x25_disconnect+0x253/0x370 [ 66.287448][ T7042] ? x25_disconnect+0x253/0x370 [ 66.292273][ T7042] kasan_report+0x33/0x50 [ 66.296579][ T7042] check_memory_region+0x141/0x190 [ 66.301674][ T7042] x25_disconnect+0x253/0x370 [ 66.306423][ T7042] x25_release+0x345/0x420 [ 66.311018][ T7042] __sock_release+0xcd/0x280 [ 66.315835][ T7042] sock_close+0x18/0x20 [ 66.320158][ T7042] __fput+0x33e/0x880 [ 66.324212][ T7042] task_work_run+0xf4/0x1b0 [ 66.328790][ T7042] exit_to_usermode_loop+0x2fa/0x360 [ 66.334400][ T7042] do_syscall_64+0x6b1/0x7d0 [ 66.339726][ T7042] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 66.346106][ T7042] RIP: 0033:0x4afb40 [ 66.350370][ T7042] 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 [ 66.370956][ T7042] RSP: 002b:000000c0000754f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000003 [ 66.379637][ T7042] RAX: 0000000000000000 RBX: 000000c00002c000 RCX: 00000000004afb40 [ 66.389251][ T7042] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 66.397573][ T7042] RBP: 000000c000075538 R08: 0000000000000000 R09: 0000000000000000 [ 66.405535][ T7042] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 66.413501][ T7042] R13: 0000000000000162 R14: 0000000000000161 R15: 0000000000000200 [ 66.422972][ T7042] Kernel Offset: disabled [ 66.427446][ T7042] Rebooting in 86400 seconds..