[  OK  ] Started Getty on tty4.
[  OK  ] Started Getty on tty3.
[  OK  ] Started Getty on tty2.
[  OK  ] Started Getty on tty1.
[  OK  ] Started Serial Getty on ttyS0.
[  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 '10.128.0.164' (ECDSA) to the list of known hosts.
2020/05/08 11:22:19 fuzzer started
2020/05/08 11:22:19 connecting to host at 10.128.0.26:38857
2020/05/08 11:22:19 checking machine...
2020/05/08 11:22:19 checking revisions...
2020/05/08 11:22:19 testing simple program...
syzkaller login: [   54.640321][ T7062] IPVS: ftp: loaded support on port[0] = 21
2020/05/08 11:22:20 building call list...
[   55.066512][  T155] tipc: TX() has been purged, node left!
[   56.170302][ T7043] can: request_module (can-proto-0) failed.
executing program
[   58.102096][ T7043] can: request_module (can-proto-0) failed.
[   58.114257][ T7043] can: request_module (can-proto-0) failed.
[   58.545557][ T7043] ==================================================================
[   58.555280][ T7043] BUG: KASAN: null-ptr-deref in x25_disconnect+0x253/0x370
[   58.563159][ T7043] Write of size 4 at addr 00000000000000d8 by task syz-fuzzer/7043
[   58.576320][ T7043] 
[   58.579434][ T7043] CPU: 0 PID: 7043 Comm: syz-fuzzer Not tainted 5.7.0-rc2-syzkaller #0
[   58.588008][ T7043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   58.599360][ T7043] Call Trace:
[   58.602916][ T7043]  dump_stack+0x188/0x20d
[   58.607424][ T7043]  ? x25_disconnect+0x253/0x370
[   58.612786][ T7043]  ? __sock_release+0x280/0x280
[   58.617722][ T7043]  __kasan_report.cold+0x5/0x4d
[   58.622727][ T7043]  ? rcu_read_lock_held+0x1/0xb0
[   58.627915][ T7043]  ? x25_disconnect+0x253/0x370
[   58.633109][ T7043]  ? x25_disconnect+0x253/0x370
[   58.637987][ T7043]  kasan_report+0x33/0x50
[   58.642297][ T7043]  check_memory_region+0x141/0x190
[   58.647393][ T7043]  x25_disconnect+0x253/0x370
[   58.652497][ T7043]  x25_release+0x345/0x420
[   58.656996][ T7043]  __sock_release+0xcd/0x280
[   58.661562][ T7043]  sock_close+0x18/0x20
[   58.665699][ T7043]  __fput+0x33e/0x880
[   58.669663][ T7043]  task_work_run+0xf4/0x1b0
[   58.674240][ T7043]  exit_to_usermode_loop+0x2fa/0x360
[   58.679551][ T7043]  do_syscall_64+0x6b1/0x7d0
[   58.684231][ T7043]  entry_SYSCALL_64_after_hwframe+0x49/0xb3
[   58.690106][ T7043] RIP: 0033:0x4afb40
[   58.693998][ T7043] 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
[   58.713596][ T7043] RSP: 002b:000000c00016f478 EFLAGS: 00000212 ORIG_RAX: 0000000000000003
[   58.721999][ T7043] RAX: 0000000000000000 RBX: 000000c00002c000 RCX: 00000000004afb40
[   58.729949][ T7043] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[   58.737948][ T7043] RBP: 000000c00016f4b8 R08: 0000000000000000 R09: 0000000000000000
[   58.745915][ T7043] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff
[   58.753957][ T7043] R13: 0000000000000160 R14: 000000000000015f R15: 0000000000000200
[   58.761954][ T7043] ==================================================================
[   58.770006][ T7043] Disabling lock debugging due to kernel taint
[   58.776274][ T7043] Kernel panic - not syncing: panic_on_warn set ...
[   58.782896][ T7043] CPU: 0 PID: 7043 Comm: syz-fuzzer Tainted: G    B             5.7.0-rc2-syzkaller #0
[   58.792509][ T7043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   58.802540][ T7043] Call Trace:
[   58.805934][ T7043]  dump_stack+0x188/0x20d
[   58.810295][ T7043]  ? __sock_release+0x280/0x280
[   58.815120][ T7043]  panic+0x2e3/0x75c
[   58.818994][ T7043]  ? add_taint.cold+0x16/0x16
[   58.823647][ T7043]  ? x25_disconnect+0x253/0x370
[   58.828472][ T7043]  ? trace_hardirqs_on+0x55/0x220
[   58.833470][ T7043]  ? x25_disconnect+0x253/0x370
[   58.838295][ T7043]  ? __sock_release+0x280/0x280
[   58.843135][ T7043]  end_report+0x4d/0x53
[   58.847263][ T7043]  __kasan_report.cold+0xd/0x4d
[   58.855127][ T7043]  ? rcu_read_lock_held+0x1/0xb0
[   58.860074][ T7043]  ? x25_disconnect+0x253/0x370
[   58.864905][ T7043]  ? x25_disconnect+0x253/0x370
[   58.869732][ T7043]  kasan_report+0x33/0x50
[   58.874066][ T7043]  check_memory_region+0x141/0x190
[   58.879180][ T7043]  x25_disconnect+0x253/0x370
[   58.883834][ T7043]  x25_release+0x345/0x420
[   58.888333][ T7043]  __sock_release+0xcd/0x280
[   58.892919][ T7043]  sock_close+0x18/0x20
[   58.897069][ T7043]  __fput+0x33e/0x880
[   58.901029][ T7043]  task_work_run+0xf4/0x1b0
[   58.905508][ T7043]  exit_to_usermode_loop+0x2fa/0x360
[   58.910786][ T7043]  do_syscall_64+0x6b1/0x7d0
[   58.915389][ T7043]  entry_SYSCALL_64_after_hwframe+0x49/0xb3
[   58.921263][ T7043] RIP: 0033:0x4afb40
[   58.925136][ T7043] 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
[   58.944719][ T7043] RSP: 002b:000000c00016f478 EFLAGS: 00000212 ORIG_RAX: 0000000000000003
[   58.953131][ T7043] RAX: 0000000000000000 RBX: 000000c00002c000 RCX: 00000000004afb40
[   58.961083][ T7043] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[   58.969030][ T7043] RBP: 000000c00016f4b8 R08: 0000000000000000 R09: 0000000000000000
[   58.977063][ T7043] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff
[   58.985008][ T7043] R13: 0000000000000160 R14: 000000000000015f R15: 0000000000000200
[   58.994558][ T7043] Kernel Offset: disabled
[   58.998888][ T7043] Rebooting in 86400 seconds..