Starting Permit User Sessions... [ OK ] Started Regular background program processing daemon. [ OK ] Started Daily apt download activities. [ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. Starting OpenBSD Secure Shell server... [ OK ] Started System Logging Service. [ OK ] Started Permit User Sessions. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ 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 ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.123' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.946865][ T7224] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 69.959596][ T7224] ================================================================== [ 69.967839][ T7224] BUG: KASAN: null-ptr-deref in get_block+0x657/0x1380 [ 69.974714][ T7224] Write of size 8 at addr 0000000000000000 by task syz-executor681/7224 [ 69.983125][ T7224] [ 69.985555][ T7224] CPU: 0 PID: 7224 Comm: syz-executor681 Not tainted 5.6.0-syzkaller #0 [ 69.993880][ T7224] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.003942][ T7224] Call Trace: [ 70.007248][ T7224] dump_stack+0x188/0x20d [ 70.011592][ T7224] ? get_block+0x657/0x1380 [ 70.016538][ T7224] __kasan_report.cold+0x5/0x4d [ 70.021399][ T7224] ? get_block+0x657/0x1380 [ 70.025913][ T7224] ? get_block+0x657/0x1380 [ 70.030421][ T7224] kasan_report+0x33/0x50 [ 70.034766][ T7224] check_memory_region+0x141/0x190 [ 70.039888][ T7224] get_block+0x657/0x1380 [ 70.044240][ T7224] ? block_to_path.isra.0+0x300/0x300 [ 70.049747][ T7224] ? mark_buffer_write_io_error+0x180/0x180 [ 70.055661][ T7224] ? create_empty_buffers+0x590/0x8c0 [ 70.061038][ T7224] ? __alloc_pages_nodemask+0x5f4/0x810 [ 70.066575][ T7224] ? do_raw_spin_unlock+0x171/0x260 [ 70.071764][ T7224] minix_get_block+0xe5/0x110 [ 70.076518][ T7224] __block_write_begin_int+0x490/0x1b00 [ 70.082046][ T7224] ? minix_rename+0x8c0/0x8c0 [ 70.086711][ T7224] ? remove_inode_buffers+0x1c0/0x1c0 [ 70.092067][ T7224] ? pagecache_get_page+0x204/0xa10 [ 70.097247][ T7224] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 70.103638][ T7224] ? wait_for_stable_page+0x11c/0x1e0 [ 70.108993][ T7224] ? minix_rename+0x8c0/0x8c0 [ 70.113650][ T7224] block_write_begin+0x58/0x2e0 [ 70.118485][ T7224] minix_write_begin+0x35/0xe0 [ 70.123229][ T7224] generic_perform_write+0x20a/0x4e0 [ 70.128513][ T7224] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 70.136648][ T7224] ? update_time+0xc0/0xc0 [ 70.141049][ T7224] ? down_write+0xdb/0x150 [ 70.145557][ T7224] __generic_file_write_iter+0x24c/0x610 [ 70.151236][ T7224] generic_file_write_iter+0x3f3/0x630 [ 70.156737][ T7224] ? __generic_file_write_iter+0x610/0x610 [ 70.162536][ T7224] ? mark_held_locks+0xe0/0xe0 [ 70.168265][ T7224] ? trace_hardirqs_off+0x50/0x220 [ 70.173382][ T7224] new_sync_write+0x4a2/0x700 [ 70.178053][ T7224] ? new_sync_read+0x7a0/0x7a0 [ 70.182836][ T7224] ? rcu_read_lock_any_held+0xcd/0xf0 [ 70.188193][ T7224] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 70.193463][ T7224] __vfs_write+0xc9/0x100 [ 70.197779][ T7224] vfs_write+0x268/0x5d0 [ 70.202003][ T7224] ksys_write+0x12d/0x250 [ 70.206312][ T7224] ? __ia32_sys_read+0xb0/0xb0 [ 70.211068][ T7224] ? filp_close+0x12f/0x170 [ 70.215569][ T7224] ? trace_hardirqs_off_caller+0x55/0x230 [ 70.221283][ T7224] do_syscall_64+0xf6/0x7d0 [ 70.225782][ T7224] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 70.231660][ T7224] RIP: 0033:0x444c19 [ 70.235548][ T7224] Code: 0d d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 70.255182][ T7224] RSP: 002b:00007ffd3ecb27e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 70.263676][ T7224] RAX: ffffffffffffffda RBX: 00007ffd3ecb27f0 RCX: 0000000000444c19 [ 70.271649][ T7224] RDX: 00000000ffffff2e RSI: 0000000020000040 RDI: 0000000000000004 [ 70.279654][ T7224] RBP: 0000000000000000 R08: 0000000000401000 R09: 0000000000401000 [ 70.288024][ T7224] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402880 [ 70.296097][ T7224] R13: 0000000000402910 R14: 0000000000000000 R15: 0000000000000000 [ 70.304085][ T7224] ================================================================== [ 70.312300][ T7224] Disabling lock debugging due to kernel taint [ 70.325939][ T7224] Kernel panic - not syncing: panic_on_warn set ... [ 70.332948][ T7224] CPU: 0 PID: 7224 Comm: syz-executor681 Tainted: G B 5.6.0-syzkaller #0 [ 70.342660][ T7224] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.353684][ T7224] Call Trace: [ 70.357364][ T7224] dump_stack+0x188/0x20d [ 70.361705][ T7224] panic+0x2e3/0x75c [ 70.365680][ T7224] ? add_taint.cold+0x16/0x16 [ 70.370362][ T7224] ? preempt_schedule_common+0x5e/0xc0 [ 70.376428][ T7224] ? get_block+0x657/0x1380 [ 70.381046][ T7224] ? preempt_schedule_thunk+0x16/0x18 [ 70.387141][ T7224] ? trace_hardirqs_on+0x55/0x220 [ 70.392582][ T7224] ? get_block+0x657/0x1380 [ 70.397181][ T7224] end_report+0x4d/0x53 [ 70.401320][ T7224] __kasan_report.cold+0xd/0x4d [ 70.406278][ T7224] ? get_block+0x657/0x1380 [ 70.410776][ T7224] ? get_block+0x657/0x1380 [ 70.415271][ T7224] kasan_report+0x33/0x50 [ 70.419587][ T7224] check_memory_region+0x141/0x190 [ 70.424703][ T7224] get_block+0x657/0x1380 [ 70.429117][ T7224] ? block_to_path.isra.0+0x300/0x300 [ 70.434476][ T7224] ? mark_buffer_write_io_error+0x180/0x180 [ 70.440492][ T7224] ? create_empty_buffers+0x590/0x8c0 [ 70.445853][ T7224] ? __alloc_pages_nodemask+0x5f4/0x810 [ 70.451498][ T7224] ? do_raw_spin_unlock+0x171/0x260 [ 70.456700][ T7224] minix_get_block+0xe5/0x110 [ 70.461374][ T7224] __block_write_begin_int+0x490/0x1b00 [ 70.466906][ T7224] ? minix_rename+0x8c0/0x8c0 [ 70.471570][ T7224] ? remove_inode_buffers+0x1c0/0x1c0 [ 70.476933][ T7224] ? pagecache_get_page+0x204/0xa10 [ 70.482345][ T7224] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 70.488742][ T7224] ? wait_for_stable_page+0x11c/0x1e0 [ 70.494199][ T7224] ? minix_rename+0x8c0/0x8c0 [ 70.498877][ T7224] block_write_begin+0x58/0x2e0 [ 70.503761][ T7224] minix_write_begin+0x35/0xe0 [ 70.508523][ T7224] generic_perform_write+0x20a/0x4e0 [ 70.513804][ T7224] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 70.521948][ T7224] ? update_time+0xc0/0xc0 [ 70.526400][ T7224] ? down_write+0xdb/0x150 [ 70.530824][ T7224] __generic_file_write_iter+0x24c/0x610 [ 70.536437][ T7224] generic_file_write_iter+0x3f3/0x630 [ 70.541879][ T7224] ? __generic_file_write_iter+0x610/0x610 [ 70.547662][ T7224] ? mark_held_locks+0xe0/0xe0 [ 70.552413][ T7224] ? trace_hardirqs_off+0x50/0x220 [ 70.557501][ T7224] new_sync_write+0x4a2/0x700 [ 70.562176][ T7224] ? new_sync_read+0x7a0/0x7a0 [ 70.566922][ T7224] ? rcu_read_lock_any_held+0xcd/0xf0 [ 70.572281][ T7224] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 70.577556][ T7224] __vfs_write+0xc9/0x100 [ 70.581861][ T7224] vfs_write+0x268/0x5d0 [ 70.586080][ T7224] ksys_write+0x12d/0x250 [ 70.590387][ T7224] ? __ia32_sys_read+0xb0/0xb0 [ 70.595122][ T7224] ? filp_close+0x12f/0x170 [ 70.599615][ T7224] ? trace_hardirqs_off_caller+0x55/0x230 [ 70.605312][ T7224] do_syscall_64+0xf6/0x7d0 [ 70.609803][ T7224] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 70.615684][ T7224] RIP: 0033:0x444c19 [ 70.619557][ T7224] Code: 0d d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 70.640017][ T7224] RSP: 002b:00007ffd3ecb27e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 70.648501][ T7224] RAX: ffffffffffffffda RBX: 00007ffd3ecb27f0 RCX: 0000000000444c19 [ 70.656464][ T7224] RDX: 00000000ffffff2e RSI: 0000000020000040 RDI: 0000000000000004 [ 70.664442][ T7224] RBP: 0000000000000000 R08: 0000000000401000 R09: 0000000000401000 [ 70.672489][ T7224] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402880 [ 70.680460][ T7224] R13: 0000000000402910 R14: 0000000000000000 R15: 0000000000000000 [ 70.690858][ T7224] Kernel Offset: disabled [ 70.695202][ T7224] Rebooting in 86400 seconds..