[ OK ] Found device /dev/ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.75' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 33.079778] ------------[ cut here ]------------ [ 33.084903] WARNING: CPU: 1 PID: 8108 at fs/udf/truncate.c:226 udf_truncate_extents.cold+0x11/0x18 [ 33.094102] Kernel panic - not syncing: panic_on_warn set ... [ 33.094102] [ 33.101550] CPU: 1 PID: 8108 Comm: syz-executor309 Not tainted 4.19.211-syzkaller #0 [ 33.109420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 33.118844] Call Trace: [ 33.121421] dump_stack+0x1fc/0x2ef [ 33.125046] panic+0x26a/0x50e [ 33.128226] ? __warn_printk+0xf3/0xf3 [ 33.132101] ? udf_truncate_extents.cold+0x11/0x18 [ 33.137049] ? __probe_kernel_read+0x130/0x1b0 [ 33.141613] ? __warn.cold+0x5/0x5a [ 33.145224] ? __warn+0xe4/0x200 [ 33.148584] ? udf_truncate_extents.cold+0x11/0x18 [ 33.153499] __warn.cold+0x20/0x5a [ 33.157023] ? udf_truncate_extents.cold+0x11/0x18 [ 33.162000] report_bug+0x262/0x2b0 [ 33.165658] do_error_trap+0x1d7/0x310 [ 33.169556] ? math_error+0x310/0x310 [ 33.173359] ? __irq_work_queue_local+0x101/0x160 [ 33.178225] ? irq_work_queue+0x29/0x80 [ 33.182256] ? error_entry+0x72/0xd0 [ 33.185958] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.190978] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.195809] invalid_op+0x14/0x20 [ 33.199252] RIP: 0010:udf_truncate_extents.cold+0x11/0x18 [ 33.204788] Code: 89 df 48 c7 c6 40 a9 9a 88 e8 ac f9 ff ff 41 bc ea ff ff ff e9 96 57 78 fa e8 b0 a9 69 f9 48 c7 c7 60 b4 9a 88 e8 0f db fa ff <0f> 0b e9 81 78 78 fa e8 98 a9 69 f9 48 c7 c6 40 ba 9a 88 48 c7 c7 [ 33.223869] RSP: 0018:ffff888094f1f948 EFLAGS: 00010286 [ 33.229227] RAX: 0000000000000024 RBX: ffff88808cbe0670 RCX: 0000000000000000 [ 33.236488] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed10129e3f1b [ 33.243758] RBP: ffff888094f1fa30 R08: 0000000000000024 R09: 0000000000000000 [ 33.251012] R10: 0000000000000005 R11: 0000000000000000 R12: ffff888094f1f9f0 [ 33.258272] R13: 0000000000000200 R14: 00000000000000ff R15: ffff8880b25ba580 [ 33.265579] ? vprintk_func+0x81/0x180 [ 33.269462] ? udf_truncate_extents.cold+0x11/0x18 [ 33.274382] ? lock_downgrade+0x720/0x720 [ 33.278518] ? udf_discard_prealloc+0x690/0x690 [ 33.283175] ? udf_write_failed.isra.0+0x173/0x1d0 [ 33.288103] ? udf_write_failed.isra.0+0xd4/0x1d0 [ 33.292937] udf_write_failed.isra.0+0x17b/0x1d0 [ 33.297681] udf_write_begin+0x89/0xa0 [ 33.301559] generic_perform_write+0x1f8/0x4d0 [ 33.306152] ? filemap_page_mkwrite+0x2f0/0x2f0 [ 33.310803] ? current_time+0x1c0/0x1c0 [ 33.314762] ? lock_downgrade+0x720/0x720 [ 33.318894] ? lock_acquire+0x170/0x3c0 [ 33.322851] __generic_file_write_iter+0x24b/0x610 [ 33.327771] udf_file_write_iter+0x2d4/0x4e0 [ 33.332160] ? iov_iter_init+0xb8/0x1d0 [ 33.336117] __vfs_write+0x51b/0x770 [ 33.339816] ? kernel_read+0x110/0x110 [ 33.343725] ? check_preemption_disabled+0x41/0x280 [ 33.348734] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 33.353742] vfs_write+0x1f3/0x540 [ 33.357448] ksys_write+0x12b/0x2a0 [ 33.361064] ? __ia32_sys_read+0xb0/0xb0 [ 33.365116] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.370124] ? do_syscall_64+0x21/0x620 [ 33.374095] do_syscall_64+0xf9/0x620 [ 33.377916] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.383099] RIP: 0033:0x7f797db84909 [ 33.386885] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 [ 33.405772] RSP: 002b:00007ffcd6a714c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 33.413550] RAX: ffffffffffffffda RBX: 00000000200001c0 RCX: 00007f797db84909 [ 33.420804] RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000003 [ 33.428058] RBP: 0000000000000000 R08: 00007ffcd6a714f0 R09: 00007ffcd6a714f0 [ 33.435330] R10: 00007ffcd6a713a0 R11: 0000000000000246 R12: 00007ffcd6a714ec [ 33.442591] R13: 00007ffcd6a71520 R14: 00007ffcd6a71500 R15: 0000000000000002 [ 33.450140] Kernel Offset: disabled [ 33.453815] Rebooting in 86400 seconds..