[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.228' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 42.004434] kasan: CONFIG_KASAN_INLINE enabled [ 42.004453] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.004468] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.004482] CPU: 0 PID: 6443 Comm: syz-executor800 Not tainted 4.19.114-syzkaller #0 [ 42.004488] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.004508] RIP: 0010:do_con_write.part.0+0x9c3/0x1db0 [ 42.004521] Code: 24 b6 00 00 00 45 01 ef e8 aa dd c7 fd 48 8b 44 24 78 80 38 00 0f 85 4c 12 00 00 49 8b 9c 24 a0 03 00 00 48 89 d8 48 c1 e8 03 <0f> b6 14 28 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 c8 [ 42.004527] RSP: 0000:ffff888089fff930 EFLAGS: 00010202 [ 42.004537] RAX: 000000001fffffe9 RBX: 00000000ffffff48 RCX: ffffffff839fc676 [ 42.004544] RDX: 0000000000000000 RSI: ffffffff839fc6c6 RDI: 0000000000000003 [ 42.004550] RBP: dffffc0000000000 R08: ffff888089a32680 R09: 0000000000000005 [ 42.004558] R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: ffff8880a4d23500 [ 42.004564] R13: 0000000000000000 R14: ffff8880a4d2388c R15: 0000000000000778 [ 42.004575] FS: 0000000001da2880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 42.004583] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.004590] CR2: 00007f86de4f4150 CR3: 00000000a8c01000 CR4: 00000000001406f0 [ 42.004600] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.004607] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.004610] Call Trace: [ 42.004634] ? do_con_trol+0x5c00/0x5c00 [ 42.004652] ? mark_held_locks+0xa6/0xf0 [ 42.004667] con_write+0x41/0xe0 [ 42.004681] n_tty_write+0x3ee/0x1080 [ 42.004699] ? process_echoes+0x160/0x160 [ 42.004714] ? do_wait_intr_irq+0x270/0x270 [ 42.004731] ? __might_fault+0x192/0x1d0 [ 42.004745] tty_write+0x452/0x790 [ 42.004758] ? process_echoes+0x160/0x160 [ 42.004774] __vfs_write+0xf7/0x760 [ 42.004786] ? tty_read+0x290/0x290 [ 42.004799] ? kernel_read+0x110/0x110 [ 42.004815] ? __inode_security_revalidate+0xd3/0x120 [ 42.004826] ? avc_policy_seqno+0x9/0x70 [ 42.004841] ? selinux_file_permission+0x87/0x520 [ 42.004858] ? security_file_permission+0x84/0x220 [ 42.004873] vfs_write+0x206/0x550 [ 42.004888] ksys_write+0x12b/0x2a0 [ 42.004901] ? __ia32_sys_read+0xb0/0xb0 [ 42.004917] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.004930] ? trace_hardirqs_off_caller+0x55/0x210 [ 42.004944] ? do_syscall_64+0x21/0x620 [ 42.004959] do_syscall_64+0xf9/0x620 [ 42.004975] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.004984] RIP: 0033:0x441639 [ 42.004996] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 42.005002] RSP: 002b:00007ffc7319bde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 42.005013] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441639 [ 42.005019] RDX: 0000000000000320 RSI: 00000000200001c0 RDI: 0000000000000003 [ 42.005026] RBP: 00000000006cc018 R08: 000000000000000e R09: 00000000004002c8 [ 42.005033] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004023b0 [ 42.005039] R13: 0000000000402440 R14: 0000000000000000 R15: 0000000000000000 [ 42.005050] Modules linked in: [ 42.005065] ---[ end trace c50d52df6e3c7bb6 ]--- [ 42.005079] RIP: 0010:do_con_write.part.0+0x9c3/0x1db0 [ 42.005090] Code: 24 b6 00 00 00 45 01 ef e8 aa dd c7 fd 48 8b 44 24 78 80 38 00 0f 85 4c 12 00 00 49 8b 9c 24 a0 03 00 00 48 89 d8 48 c1 e8 03 <0f> b6 14 28 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 c8 [ 42.005096] RSP: 0000:ffff888089fff930 EFLAGS: 00010202 [ 42.005105] RAX: 000000001fffffe9 RBX: 00000000ffffff48 RCX: ffffffff839fc676 [ 42.005112] RDX: 0000000000000000 RSI: ffffffff839fc6c6 RDI: 0000000000000003 [ 42.005120] RBP: dffffc0000000000 R08: ffff888089a32680 R09: 0000000000000005 [ 42.005128] R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: ffff8880a4d23500 [ 42.005135] R13: 0000000000000000 R14: ffff8880a4d2388c R15: 0000000000000778 [ 42.005146] FS: 0000000001da2880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 42.005154] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.005161] CR2: 00007f86de4f4150 CR3: 00000000a8c01000 CR4: 00000000001406f0 [ 42.005168] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.005175] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.005180] Kernel panic - not syncing: Fatal exception [ 42.006686] Kernel Offset: disabled