[ OK ] Found device /dev/ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty6. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.162799] REISERFS (device loop0): found reiserfs format "3.5" with non-standard journal [ 34.171788] REISERFS (device loop0): using ordered data mode [ 34.177895] reiserfs: using flush barriers [ 34.183297] REISERFS (device loop0): journal params: device loop0, size 8192, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 [ 34.202025] REISERFS (device loop0): checking transaction log (loop0) [ 34.917352] REISERFS (device loop0): Using rupasov hash to sort names [ 34.925109] REISERFS (device loop0): using 3.5.x disk format [ 34.931545] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 34.939503] PGD aa363067 P4D aa363067 PUD 983c6067 PMD 0 [ 34.945034] Oops: 0010 [#1] PREEMPT SMP KASAN [ 34.949511] CPU: 0 PID: 8123 Comm: syz-executor964 Not tainted 4.19.152-syzkaller #0 [ 34.957369] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.966729] RIP: 0010: (null) [ 34.970624] Code: Bad RIP value. [ 34.973968] RSP: 0018:ffff888094c078a8 EFLAGS: 00010246 [ 34.979435] RAX: dffffc0000000000 RBX: 1ffff11012980f18 RCX: ffffffff81a7de9b [ 34.986683] RDX: 0000000000000000 RSI: ffff88808e22a5c0 RDI: ffff88808ace7740 [ 34.993948] RBP: ffffffff8878ce00 R08: 0000000000000000 R09: 0000000000000000 [ 35.001206] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808e22a5c0 [ 35.008457] R13: ffff88808ace7740 R14: ffff888094c07a38 R15: ffff888094c078e0 [ 35.015709] FS: 0000000000fbe880(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 35.023916] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.029778] CR2: ffffffffffffffd6 CR3: 00000000a9c44000 CR4: 00000000001406f0 [ 35.037029] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.044277] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.051522] Call Trace: [ 35.054095] __lookup_slow+0x246/0x4a0 [ 35.057990] ? follow_dotdot_rcu+0x1040/0x1040 [ 35.062554] ? __d_lookup+0x411/0x710 [ 35.066338] ? d_lookup+0x18e/0x250 [ 35.069946] lookup_one_len+0x163/0x190 [ 35.073900] ? try_lookup_one_len+0x180/0x180 [ 35.078407] reiserfs_lookup_privroot+0x92/0x280 [ 35.083145] reiserfs_fill_super+0x202c/0x2ce4 [ 35.087720] ? reiserfs_remount+0x1540/0x1540 [ 35.092207] ? lock_downgrade+0x720/0x720 [ 35.096357] ? snprintf+0xbb/0xf0 [ 35.100054] ? wait_for_completion_io+0x10/0x10 [ 35.104726] mount_bdev+0x2fc/0x3b0 [ 35.108334] ? reiserfs_remount+0x1540/0x1540 [ 35.112810] mount_fs+0xa3/0x30c [ 35.116173] vfs_kern_mount.part.0+0x68/0x470 [ 35.120656] do_mount+0x113c/0x2f10 [ 35.124264] ? do_raw_spin_unlock+0x171/0x230 [ 35.128749] ? check_preemption_disabled+0x41/0x280 [ 35.133748] ? copy_mount_string+0x40/0x40 [ 35.137964] ? copy_mount_options+0x59/0x380 [ 35.142371] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 35.147368] ? kmem_cache_alloc_trace+0x323/0x380 [ 35.152191] ? copy_mount_options+0x26f/0x380 [ 35.156688] ksys_mount+0xcf/0x130 [ 35.160229] __x64_sys_mount+0xba/0x150 [ 35.164184] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 35.168747] do_syscall_64+0xf9/0x620 [ 35.172530] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.177697] RIP: 0033:0x447d9a [ 35.180888] Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d a3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5a a3 fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 35.199766] RSP: 002b:00007ffd75de9b18 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 35.207451] RAX: ffffffffffffffda RBX: 00007ffd75de9b70 RCX: 0000000000447d9a [ 35.214699] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd75de9b30 [ 35.221948] RBP: 00007ffd75de9b30 R08: 00007ffd75de9b70 R09: 0000000000000000 [ 35.229194] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000006 [ 35.236443] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 35.243709] Modules linked in: [ 35.246881] CR2: 0000000000000000 [ 35.259161] ---[ end trace 5619fcbd191dfb9f ]--- [ 35.263940] RIP: 0010: (null) [ 35.267819] Code: Bad RIP value. [ 35.271202] RSP: 0018:ffff888094c078a8 EFLAGS: 00010246 [ 35.276598] RAX: dffffc0000000000 RBX: 1ffff11012980f18 RCX: ffffffff81a7de9b [ 35.283912] RDX: 0000000000000000 RSI: ffff88808e22a5c0 RDI: ffff88808ace7740 [ 35.291306] RBP: ffffffff8878ce00 R08: 0000000000000000 R09: 0000000000000000 [ 35.298627] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808e22a5c0 [ 35.305891] R13: ffff88808ace7740 R14: ffff888094c07a38 R15: ffff888094c078e0 [ 35.313185] FS: 0000000000fbe880(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 35.321485] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.327356] CR2: ffffffffffffffd6 CR3: 00000000a9c44000 CR4: 00000000001406e0 [ 35.334665] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.342048] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.349363] Kernel panic - not syncing: Fatal exception [ 35.355381] Kernel Offset: disabled [ 35.359018] Rebooting in 86400 seconds..