[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 '10.128.1.67' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.645872] kasan: CONFIG_KASAN_INLINE enabled [ 33.650580] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.658441] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.664672] CPU: 0 PID: 8101 Comm: syz-executor328 Not tainted 4.19.211-syzkaller #0 [ 33.672551] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.681914] RIP: 0010:chrdev_open+0xb8/0x770 [ 33.686340] Code: 8b ac 24 88 03 00 00 48 85 ed 0f 84 7f 02 00 00 e8 0d d1 be ff 48 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9e 05 00 00 4c 8b 7d 40 4d 85 ff 74 22 e8 e0 d0 [ 33.705244] RSP: 0018:ffff8880994e79e8 EFLAGS: 00010202 [ 33.710594] RAX: dffffc0000000000 RBX: 1ffff1101329cf3f RCX: ffffffff814bdebb [ 33.717845] RDX: 0000000000000008 RSI: ffffffff81a3b463 RDI: 0000000000000042 [ 33.725095] RBP: 0000000000000002 R08: 0000000000000001 R09: fffffbfff1407a30 [ 33.732345] R10: ffffffff8a03d183 R11: 0000000000000000 R12: ffff88808cbad6c0 [ 33.739609] R13: ffff8880af2782c0 R14: ffff88808cbada48 R15: ffff8880af2782e8 [ 33.746872] FS: 0000555556ea73c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 33.757088] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.762960] CR2: 00007ffd673039c0 CR3: 00000000a5a56000 CR4: 00000000003406f0 [ 33.770819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.778070] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.785420] Call Trace: [ 33.787993] ? lock_downgrade+0x720/0x720 [ 33.792121] ? lockref_get+0x11/0x50 [ 33.795816] ? __register_chrdev+0x400/0x400 [ 33.800466] do_dentry_open+0x4aa/0x1160 [ 33.804551] ? __register_chrdev+0x400/0x400 [ 33.808963] ? inode_permission.part.0+0x10c/0x450 [ 33.813877] ? chown_common+0x550/0x550 [ 33.817831] ? inode_permission+0x3d/0x140 [ 33.822060] path_openat+0x793/0x2df0 [ 33.825862] ? path_lookupat+0x8d0/0x8d0 [ 33.829927] ? mark_held_locks+0xf0/0xf0 [ 33.833987] ? __lock_acquire+0x6de/0x3ff0 [ 33.838222] do_filp_open+0x18c/0x3f0 [ 33.842005] ? may_open_dev+0xf0/0xf0 [ 33.845806] ? lock_downgrade+0x720/0x720 [ 33.849935] ? lock_acquire+0x170/0x3c0 [ 33.853904] ? __alloc_fd+0x34/0x570 [ 33.857604] ? do_raw_spin_unlock+0x171/0x230 [ 33.862099] ? _raw_spin_unlock+0x29/0x40 [ 33.866245] ? __alloc_fd+0x28d/0x570 [ 33.870037] do_sys_open+0x3b3/0x520 [ 33.873753] ? filp_open+0x70/0x70 [ 33.877285] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 33.882647] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.888024] ? do_syscall_64+0x21/0x620 [ 33.892010] do_syscall_64+0xf9/0x620 [ 33.895820] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.901081] RIP: 0033:0x7f954eaab929 [ 33.904807] Code: 28 c3 e8 5a 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 [ 33.923697] RSP: 002b:00007ffd78ce7aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 33.931384] RAX: ffffffffffffffda RBX: 00007ffd78ce7ab8 RCX: 00007f954eaab929 [ 33.938646] RDX: 0000000000000034 RSI: 0000000000080082 RDI: 0000000020000040 [ 33.945905] RBP: 00007ffd78ce7ab0 R08: 00007f954ea69bf0 R09: 00007f954ea69bf0 [ 33.953158] R10: 00007f954ea69bf0 R11: 0000000000000246 R12: 0000000000000000 [ 33.960418] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.967682] Modules linked in: [ 33.971114] ---[ end trace 120c0d5105b0a03b ]--- [ 33.975882] RIP: 0010:chrdev_open+0xb8/0x770 [ 33.980315] Code: 8b ac 24 88 03 00 00 48 85 ed 0f 84 7f 02 00 00 e8 0d d1 be ff 48 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9e 05 00 00 4c 8b 7d 40 4d 85 ff 74 22 e8 e0 d0 [ 33.999370] RSP: 0018:ffff8880994e79e8 EFLAGS: 00010202 [ 34.004771] RAX: dffffc0000000000 RBX: 1ffff1101329cf3f RCX: ffffffff814bdebb [ 34.012067] RDX: 0000000000000008 RSI: ffffffff81a3b463 RDI: 0000000000000042 [ 34.019330] RBP: 0000000000000002 R08: 0000000000000001 R09: fffffbfff1407a30 [ 34.026633] R10: ffffffff8a03d183 R11: 0000000000000000 R12: ffff88808cbad6c0 [ 34.033933] R13: ffff8880af2782c0 R14: ffff88808cbada48 R15: ffff8880af2782e8 [ 34.041320] FS: 0000555556ea73c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 34.049735] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.055637] CR2: 00007ffd673039c0 CR3: 00000000a5a56000 CR4: 00000000003406f0 [ 34.062963] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.070244] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.077549] Kernel panic - not syncing: Fatal exception [ 34.083153] Kernel Offset: disabled [ 34.086769] Rebooting in 86400 seconds..