[ OK ] Started Getty on tty1. [ OK ] Found device /dev/ttyS0. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.182' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.790744][ T8435] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 48.802615][ T8435] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 48.811016][ T8435] CPU: 0 PID: 8435 Comm: syz-executor272 Not tainted 5.14.0-rc7-syzkaller #0 [ 48.819764][ T8435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.829911][ T8435] RIP: 0010:memchr+0x2f/0x70 [ 48.834646][ T8435] Code: 41 54 53 48 89 d3 41 89 f7 45 31 f6 49 bc 00 00 00 00 00 fc ff df 0f 1f 44 00 00 48 85 db 74 3b 48 89 fd 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 0f 48 ff cb 48 8d 7d 01 44 38 7d 00 75 db [ 48.854252][ T8435] RSP: 0018:ffffc9000d9f7d08 EFLAGS: 00010246 [ 48.860320][ T8435] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88801c1f3880 [ 48.868627][ T8435] RDX: 0000000000000001 RSI: 000000000000002c RDI: 0000000000000000 [ 48.876590][ T8435] RBP: 0000000000000000 R08: ffffffff81e3db46 R09: ffffffff81e3d8e2 [ 48.884560][ T8435] R10: 0000000000000002 R11: ffff88801c1f3880 R12: dffffc0000000000 [ 48.892524][ T8435] R13: 1ffff92001b3efcc R14: 0000000000000000 R15: 000000000000002c [ 48.900484][ T8435] FS: 0000000000deb300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 48.909398][ T8435] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.915969][ T8435] CR2: 0000000020000044 CR3: 0000000037173000 CR4: 00000000001506f0 [ 48.923938][ T8435] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.931912][ T8435] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.939958][ T8435] Call Trace: [ 48.943226][ T8435] legacy_parse_param+0x49b/0x810 [ 48.948243][ T8435] vfs_parse_fs_param+0x1df/0x460 [ 48.953250][ T8435] __se_sys_fsconfig+0xba9/0xff0 [ 48.958170][ T8435] ? __x64_sys_fsconfig+0xc0/0xc0 [ 48.963175][ T8435] ? syscall_enter_from_user_mode+0x2e/0x1b0 [ 48.969148][ T8435] ? lockdep_hardirqs_on+0x8d/0x130 [ 48.974326][ T8435] ? __x64_sys_fsconfig+0x1c/0xc0 [ 48.979331][ T8435] do_syscall_64+0x3d/0xb0 [ 48.983736][ T8435] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 48.989634][ T8435] RIP: 0033:0x43ee69 [ 48.993521][ T8435] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 49.013381][ T8435] RSP: 002b:00007ffc5e9e0b98 EFLAGS: 00000246 ORIG_RAX: 00000000000001af [ 49.021802][ T8435] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ee69 [ 49.029796][ T8435] RDX: 0000000020000080 RSI: 0000000000000001 RDI: 0000000000000003 [ 49.037871][ T8435] RBP: 0000000000402e50 R08: 0000000000000000 R09: 0000000000400488 [ 49.045844][ T8435] R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000402ee0 [ 49.053986][ T8435] R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 [ 49.061959][ T8435] Modules linked in: [ 49.066559][ T8435] ---[ end trace 74baf661f3b47b0a ]--- [ 49.072027][ T8435] RIP: 0010:memchr+0x2f/0x70 [ 49.076725][ T8435] Code: 41 54 53 48 89 d3 41 89 f7 45 31 f6 49 bc 00 00 00 00 00 fc ff df 0f 1f 44 00 00 48 85 db 74 3b 48 89 fd 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 0f 48 ff cb 48 8d 7d 01 44 38 7d 00 75 db [ 49.096773][ T8435] RSP: 0018:ffffc9000d9f7d08 EFLAGS: 00010246 [ 49.102859][ T8435] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88801c1f3880 [ 49.111164][ T8435] RDX: 0000000000000001 RSI: 000000000000002c RDI: 0000000000000000 [ 49.119219][ T8435] RBP: 0000000000000000 R08: ffffffff81e3db46 R09: ffffffff81e3d8e2 [ 49.127322][ T8435] R10: 0000000000000002 R11: ffff88801c1f3880 R12: dffffc0000000000 [ 49.135362][ T8435] R13: 1ffff92001b3efcc R14: 0000000000000000 R15: 000000000000002c [ 49.143509][ T8435] FS: 0000000000deb300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 49.152791][ T8435] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.159667][ T8435] CR2: 00007fed5f8146c0 CR3: 0000000037173000 CR4: 00000000001506e0 [ 49.167719][ T8435] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.177058][ T8435] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.186996][ T8435] Kernel panic - not syncing: Fatal exception [ 49.194559][ T8435] Kernel Offset: disabled [ 49.198983][ T8435] Rebooting in 86400 seconds..