[ 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 '10.128.0.161' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.833708][ T7039] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 62.858351][ T7039] ================================================================== [ 62.866958][ T7039] BUG: KASAN: null-ptr-deref in get_block+0x657/0x1380 [ 62.874362][ T7039] Write of size 8 at addr 0000000000000000 by task syz-executor801/7039 [ 62.883704][ T7039] [ 62.886476][ T7039] CPU: 0 PID: 7039 Comm: syz-executor801 Not tainted 5.7.0-rc1-next-20200414-syzkaller #0 [ 62.896945][ T7039] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.907768][ T7039] Call Trace: [ 62.911147][ T7039] dump_stack+0x188/0x20d [ 62.915878][ T7039] ? get_block+0x657/0x1380 [ 62.925645][ T7039] __kasan_report.cold+0x5/0x4d [ 62.930940][ T7039] ? get_block+0x657/0x1380 [ 62.935866][ T7039] ? get_block+0x657/0x1380 [ 62.941799][ T7039] kasan_report+0x33/0x50 [ 62.947023][ T7039] check_memory_region+0x141/0x190 [ 62.952876][ T7039] get_block+0x657/0x1380 [ 62.957732][ T7039] ? block_to_path.isra.0+0x300/0x300 [ 62.964426][ T7039] ? mark_buffer_write_io_error+0x180/0x180 [ 62.971126][ T7039] ? create_empty_buffers+0x590/0x8c0 [ 62.977139][ T7039] ? __alloc_pages_nodemask+0x5f4/0x810 [ 62.983166][ T7039] ? do_raw_spin_unlock+0x171/0x260 [ 62.988521][ T7039] minix_get_block+0xe5/0x110 [ 62.993916][ T7039] __block_write_begin_int+0x490/0x1b00 [ 62.999802][ T7039] ? minix_rename+0x8c0/0x8c0 [ 63.004528][ T7039] ? remove_inode_buffers+0x1c0/0x1c0 [ 63.009918][ T7039] ? pagecache_get_page+0x204/0xa10 [ 63.015138][ T7039] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 63.021548][ T7039] ? wait_for_stable_page+0x11c/0x1e0 [ 63.027038][ T7039] ? minix_rename+0x8c0/0x8c0 [ 63.031732][ T7039] block_write_begin+0x58/0x2e0 [ 63.036578][ T7039] minix_write_begin+0x35/0xe0 [ 63.041342][ T7039] generic_perform_write+0x20a/0x4e0 [ 63.046755][ T7039] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 63.054823][ T7039] ? update_time+0xc0/0xc0 [ 63.059239][ T7039] ? down_write+0xdb/0x150 [ 63.063678][ T7039] __generic_file_write_iter+0x24c/0x610 [ 63.069310][ T7039] generic_file_write_iter+0x3f3/0x630 [ 63.075044][ T7039] ? __generic_file_write_iter+0x610/0x610 [ 63.080970][ T7039] ? mark_held_locks+0xe0/0xe0 [ 63.085827][ T7039] ? trace_hardirqs_off+0x50/0x220 [ 63.090950][ T7039] new_sync_write+0x4a2/0x700 [ 63.095665][ T7039] ? new_sync_read+0x7a0/0x7a0 [ 63.100536][ T7039] ? rcu_read_lock_any_held+0xcd/0xf0 [ 63.105923][ T7039] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 63.111256][ T7039] __vfs_write+0xc9/0x100 [ 63.115580][ T7039] vfs_write+0x268/0x5d0 [ 63.119829][ T7039] ksys_write+0x12d/0x250 [ 63.124156][ T7039] ? __ia32_sys_read+0xb0/0xb0 [ 63.128908][ T7039] ? filp_close+0x12f/0x170 [ 63.133510][ T7039] ? trace_hardirqs_off_caller+0x55/0x230 [ 63.139233][ T7039] do_syscall_64+0xf6/0x7d0 [ 63.143736][ T7039] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 63.149988][ T7039] RIP: 0033:0x444c19 [ 63.153879][ T7039] 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 [ 63.173479][ T7039] RSP: 002b:00007fff24751328 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 63.181976][ T7039] RAX: ffffffffffffffda RBX: 00007fff24751330 RCX: 0000000000444c19 [ 63.189929][ T7039] RDX: 00000000ffffff2e RSI: 0000000020000040 RDI: 0000000000000004 [ 63.197901][ T7039] RBP: 0000000000000000 R08: 0000000000401000 R09: 0000000000401000 [ 63.205854][ T7039] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402880 [ 63.213819][ T7039] R13: 0000000000402910 R14: 0000000000000000 R15: 0000000000000000 [ 63.221789][ T7039] ================================================================== [ 63.229963][ T7039] Disabling lock debugging due to kernel taint [ 63.237728][ T7039] Kernel panic - not syncing: panic_on_warn set ... [ 63.244383][ T7039] CPU: 0 PID: 7039 Comm: syz-executor801 Tainted: G B 5.7.0-rc1-next-20200414-syzkaller #0 [ 63.255831][ T7039] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.265902][ T7039] Call Trace: [ 63.269193][ T7039] dump_stack+0x188/0x20d [ 63.273504][ T7039] panic+0x2e3/0x75c [ 63.277388][ T7039] ? add_taint.cold+0x16/0x16 [ 63.282045][ T7039] ? preempt_schedule_common+0x5e/0xc0 [ 63.287505][ T7039] ? get_block+0x657/0x1380 [ 63.291992][ T7039] ? preempt_schedule_thunk+0x16/0x18 [ 63.297376][ T7039] ? trace_hardirqs_on+0x55/0x220 [ 63.302395][ T7039] ? get_block+0x657/0x1380 [ 63.306892][ T7039] end_report+0x4d/0x53 [ 63.311128][ T7039] __kasan_report.cold+0xd/0x4d [ 63.316019][ T7039] ? get_block+0x657/0x1380 [ 63.320528][ T7039] ? get_block+0x657/0x1380 [ 63.325035][ T7039] kasan_report+0x33/0x50 [ 63.329367][ T7039] check_memory_region+0x141/0x190 [ 63.334484][ T7039] get_block+0x657/0x1380 [ 63.338806][ T7039] ? block_to_path.isra.0+0x300/0x300 [ 63.344171][ T7039] ? mark_buffer_write_io_error+0x180/0x180 [ 63.350067][ T7039] ? create_empty_buffers+0x590/0x8c0 [ 63.355417][ T7039] ? __alloc_pages_nodemask+0x5f4/0x810 [ 63.360943][ T7039] ? do_raw_spin_unlock+0x171/0x260 [ 63.366124][ T7039] minix_get_block+0xe5/0x110 [ 63.370835][ T7039] __block_write_begin_int+0x490/0x1b00 [ 63.376369][ T7039] ? minix_rename+0x8c0/0x8c0 [ 63.381031][ T7039] ? remove_inode_buffers+0x1c0/0x1c0 [ 63.386389][ T7039] ? pagecache_get_page+0x204/0xa10 [ 63.391578][ T7039] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 63.398007][ T7039] ? wait_for_stable_page+0x11c/0x1e0 [ 63.403384][ T7039] ? minix_rename+0x8c0/0x8c0 [ 63.408053][ T7039] block_write_begin+0x58/0x2e0 [ 63.412884][ T7039] minix_write_begin+0x35/0xe0 [ 63.417643][ T7039] generic_perform_write+0x20a/0x4e0 [ 63.423001][ T7039] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 63.431145][ T7039] ? update_time+0xc0/0xc0 [ 63.435645][ T7039] ? down_write+0xdb/0x150 [ 63.440174][ T7039] __generic_file_write_iter+0x24c/0x610 [ 63.445816][ T7039] generic_file_write_iter+0x3f3/0x630 [ 63.451284][ T7039] ? __generic_file_write_iter+0x610/0x610 [ 63.457069][ T7039] ? mark_held_locks+0xe0/0xe0 [ 63.461827][ T7039] ? trace_hardirqs_off+0x50/0x220 [ 63.466934][ T7039] new_sync_write+0x4a2/0x700 [ 63.471619][ T7039] ? new_sync_read+0x7a0/0x7a0 [ 63.476376][ T7039] ? rcu_read_lock_any_held+0xcd/0xf0 [ 63.481740][ T7039] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 63.487006][ T7039] __vfs_write+0xc9/0x100 [ 63.491330][ T7039] vfs_write+0x268/0x5d0 [ 63.495549][ T7039] ksys_write+0x12d/0x250 [ 63.499879][ T7039] ? __ia32_sys_read+0xb0/0xb0 [ 63.504627][ T7039] ? filp_close+0x12f/0x170 [ 63.509161][ T7039] ? trace_hardirqs_off_caller+0x55/0x230 [ 63.514930][ T7039] do_syscall_64+0xf6/0x7d0 [ 63.519442][ T7039] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 63.525400][ T7039] RIP: 0033:0x444c19 [ 63.529301][ T7039] 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 [ 63.548991][ T7039] RSP: 002b:00007fff24751328 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 63.557658][ T7039] RAX: ffffffffffffffda RBX: 00007fff24751330 RCX: 0000000000444c19 [ 63.565643][ T7039] RDX: 00000000ffffff2e RSI: 0000000020000040 RDI: 0000000000000004 [ 63.573607][ T7039] RBP: 0000000000000000 R08: 0000000000401000 R09: 0000000000401000 [ 63.581665][ T7039] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402880 [ 63.589748][ T7039] R13: 0000000000402910 R14: 0000000000000000 R15: 0000000000000000 [ 63.600792][ T7039] Kernel Offset: disabled [ 63.605122][ T7039] Rebooting in 86400 seconds..