[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ 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 '10.128.0.14' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.901013][ T6804] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 56.913092][ T6804] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 56.921784][ T6804] CPU: 1 PID: 6804 Comm: syz-executor517 Not tainted 5.7.0-syzkaller #0 [ 56.930187][ T6804] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.940265][ T6804] RIP: 0010:qrtr_endpoint_post+0x92/0xfa0 [ 56.945978][ T6804] Code: 44 89 e6 e8 80 27 4e fe 48 85 c0 48 89 c5 0f 84 57 0e 00 00 e8 4f 7a 9e f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 48 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 f7 0c 00 00 [ 56.965649][ T6804] RSP: 0018:ffffc90001577c38 EFLAGS: 00010202 [ 56.971789][ T6804] RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff86237e4b [ 56.979750][ T6804] RDX: 0000000000000002 RSI: ffffffff87d55471 RDI: ffff88809d1d1e10 [ 56.987696][ T6804] RBP: ffff88809d1d1e00 R08: ffff888095a3c400 R09: ffffed101229fa1d [ 56.995643][ T6804] R10: ffff8880914fd0e3 R11: ffffed101229fa1c R12: 0000000000000000 [ 57.003606][ T6804] R13: ffff8880a84d6f00 R14: ffffc90001577ea0 R15: 0000000000000000 [ 57.011558][ T6804] FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000009707840 [ 57.020462][ T6804] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 57.027280][ T6804] CR2: 0000000020000000 CR3: 0000000094f12000 CR4: 00000000001406e0 [ 57.035750][ T6804] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.043703][ T6804] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.051647][ T6804] Call Trace: [ 57.054928][ T6804] ? find_held_lock+0x2d/0x110 [ 57.060373][ T6804] qrtr_tun_write_iter+0xf5/0x180 [ 57.065377][ T6804] new_sync_write+0x426/0x650 [ 57.070047][ T6804] ? new_sync_read+0x6d0/0x6d0 [ 57.074787][ T6804] ? apparmor_path_rmdir+0x30/0x30 [ 57.079875][ T6804] ? security_file_permission+0x8c/0x470 [ 57.086376][ T6804] ? file_open_root+0x400/0x400 [ 57.091198][ T6804] __vfs_write+0xc9/0x100 [ 57.095504][ T6804] vfs_write+0x268/0x5d0 [ 57.099721][ T6804] ksys_write+0x12d/0x250 [ 57.104024][ T6804] ? __ia32_sys_read+0xb0/0xb0 [ 57.108770][ T6804] ? do_fast_syscall_32+0xcc/0xe90 [ 57.113856][ T6804] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 57.119829][ T6804] do_fast_syscall_32+0x270/0xe90 [ 57.124855][ T6804] entry_SYSENTER_compat+0x70/0x7f [ 57.129939][ T6804] Modules linked in: [ 57.134136][ T6804] ---[ end trace 71f87235be4e0c3c ]--- [ 57.139697][ T6804] RIP: 0010:qrtr_endpoint_post+0x92/0xfa0 [ 57.145489][ T6804] Code: 44 89 e6 e8 80 27 4e fe 48 85 c0 48 89 c5 0f 84 57 0e 00 00 e8 4f 7a 9e f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 48 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 f7 0c 00 00 [ 57.165176][ T6804] RSP: 0018:ffffc90001577c38 EFLAGS: 00010202 [ 57.171243][ T6804] RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff86237e4b [ 57.179255][ T6804] RDX: 0000000000000002 RSI: ffffffff87d55471 RDI: ffff88809d1d1e10 [ 57.188257][ T6804] RBP: ffff88809d1d1e00 R08: ffff888095a3c400 R09: ffffed101229fa1d [ 57.196314][ T6804] R10: ffff8880914fd0e3 R11: ffffed101229fa1c R12: 0000000000000000 [ 57.204337][ T6804] R13: ffff8880a84d6f00 R14: ffffc90001577ea0 R15: 0000000000000000 [ 57.212295][ T6804] FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000009707840 [ 57.221261][ T6804] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 57.227914][ T6804] CR2: 0000000020000000 CR3: 0000000094f12000 CR4: 00000000001406e0 [ 57.235945][ T6804] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.244055][ T6804] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.252032][ T6804] Kernel panic - not syncing: Fatal exception [ 57.259541][ T6804] Kernel Offset: disabled [ 57.263965][ T6804] Rebooting in 86400 seconds..