[ OK ] Started System Logging Service. [ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.140' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 74.199039][ T7041] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.210974][ T7041] minix_free_inode: bit 1 already cleared [ 74.299506][ T7051] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.308850][ T7051] minix_free_inode: bit 1 already cleared [ 74.314071][ T7050] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.316755][ T7053] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.335470][ T7053] minix_free_inode: bit 1 already cleared [ 74.341876][ T7050] minix_free_inode: bit 1 already cleared [ 74.352677][ T7052] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.360321][ T7046] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.362916][ T7052] minix_free_inode: bit 1 already cleared [ 74.375654][ T7046] minix_free_inode: bit 1 already cleared [ 74.388703][ T7041] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.401214][ T7051] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 74.411754][ T7041] minix_free_inode: bit 1 already cleared [ 74.418133][ T7051] minix_free_inode: bit 1 already cleared executing program executing program executing program executing program executing program executing program [ 75.039964][ T7097] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 75.040764][ T7100] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 75.065485][ T7100] minix_free_inode: bit 1 already cleared [ 75.097955][ T7108] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 75.123623][ T7108] minix_free_inode: bit 1 already cleared [ 75.146741][ T7126] ================================================================== [ 75.155063][ T7126] BUG: KASAN: null-ptr-deref in get_block+0x657/0x1380 [ 75.161912][ T7126] Write of size 8 at addr 0000000000000000 by task syz-executor701/7126 [ 75.170224][ T7126] [ 75.172564][ T7126] CPU: 0 PID: 7126 Comm: syz-executor701 Not tainted 5.6.0-syzkaller #0 [ 75.180891][ T7126] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.190957][ T7126] Call Trace: [ 75.194262][ T7126] dump_stack+0x188/0x20d [ 75.198614][ T7126] ? get_block+0x657/0x1380 [ 75.203129][ T7126] __kasan_report.cold+0x5/0x4d [ 75.207996][ T7126] ? get_block+0x657/0x1380 [ 75.212515][ T7126] ? get_block+0x657/0x1380 [ 75.217024][ T7126] kasan_report+0x33/0x50 [ 75.221362][ T7126] check_memory_region+0x141/0x190 [ 75.226472][ T7126] get_block+0x657/0x1380 [ 75.230796][ T7126] ? block_to_path.isra.0+0x300/0x300 [ 75.236162][ T7126] ? mark_buffer_write_io_error+0x180/0x180 [ 75.242071][ T7126] ? create_empty_buffers+0x590/0x8c0 [ 75.247432][ T7126] ? __alloc_pages_nodemask+0x5f4/0x810 [ 75.252980][ T7126] ? do_raw_spin_unlock+0x171/0x260 [ 75.258173][ T7126] minix_get_block+0xe5/0x110 [ 75.262853][ T7126] __block_write_begin_int+0x490/0x1b00 [ 75.268388][ T7126] ? minix_rename+0x8c0/0x8c0 [ 75.273058][ T7126] ? remove_inode_buffers+0x1c0/0x1c0 [ 75.278413][ T7126] ? pagecache_get_page+0x204/0xa10 [ 75.283622][ T7126] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 75.290019][ T7126] ? wait_for_stable_page+0x11c/0x1e0 [ 75.295386][ T7126] ? minix_rename+0x8c0/0x8c0 [ 75.300067][ T7126] block_write_begin+0x58/0x2e0 [ 75.304941][ T7126] minix_write_begin+0x35/0xe0 [ 75.309745][ T7126] generic_perform_write+0x20a/0x4e0 [ 75.315037][ T7126] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 75.323202][ T7126] ? update_time+0xc0/0xc0 [ 75.327633][ T7126] ? down_write+0xdb/0x150 [ 75.332072][ T7126] __generic_file_write_iter+0x24c/0x610 [ 75.337733][ T7126] generic_file_write_iter+0x3f3/0x630 [ 75.343198][ T7126] ? __generic_file_write_iter+0x610/0x610 [ 75.349006][ T7126] ? mark_held_locks+0xe0/0xe0 [ 75.353784][ T7126] new_sync_write+0x4a2/0x700 [ 75.358462][ T7126] ? new_sync_read+0x7a0/0x7a0 [ 75.363218][ T7126] ? rcu_read_lock_any_held+0xcd/0xf0 [ 75.368589][ T7126] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 75.373877][ T7126] __vfs_write+0xc9/0x100 [ 75.378193][ T7126] vfs_write+0x268/0x5d0 [ 75.382418][ T7126] ksys_write+0x12d/0x250 [ 75.386751][ T7126] ? __ia32_sys_read+0xb0/0xb0 [ 75.391507][ T7126] ? fpregs_mark_activate+0x320/0x320 [ 75.396880][ T7126] ? trace_hardirqs_off_caller+0x55/0x230 [ 75.402632][ T7126] do_syscall_64+0xf6/0x7d0 [ 75.407154][ T7126] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 75.413051][ T7126] RIP: 0033:0x44b339 [ 75.416941][ T7126] Code: 5d ca 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 2b ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 75.436561][ T7126] RSP: 002b:00007fbdf34ebce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 75.444988][ T7126] RAX: ffffffffffffffda RBX: 00000000006ddc48 RCX: 000000000044b339 [ 75.452949][ T7126] RDX: 000000000000fdef RSI: 00000000200002c0 RDI: 0000000000000008 [ 75.460923][ T7126] RBP: 00000000006ddc40 R08: 0000000000000000 R09: 0000000000000000 [ 75.468899][ T7126] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc4c [ 75.476862][ T7126] R13: 00007ffceabc179f R14: 00007fbdf34ec9c0 R15: 0000000000000001 [ 75.484833][ T7126] ================================================================== [ 75.492883][ T7126] Disabling lock debugging due to kernel taint [ 75.501533][ T7126] Kernel panic - not syncing: panic_on_warn set ... [ 75.508142][ T7126] CPU: 0 PID: 7126 Comm: syz-executor701 Tainted: G B 5.6.0-syzkaller #0 [ 75.517857][ T7126] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.528011][ T7126] Call Trace: [ 75.531297][ T7126] dump_stack+0x188/0x20d [ 75.535646][ T7126] panic+0x2e3/0x75c [ 75.539523][ T7126] ? add_taint.cold+0x16/0x16 [ 75.544198][ T7126] ? preempt_schedule_common+0x5e/0xc0 [ 75.549761][ T7126] ? get_block+0x657/0x1380 [ 75.554272][ T7126] ? preempt_schedule_thunk+0x16/0x18 [ 75.559626][ T7126] ? trace_hardirqs_on+0x55/0x220 [ 75.564645][ T7126] ? get_block+0x657/0x1380 [ 75.569129][ T7126] end_report+0x4d/0x53 [ 75.573263][ T7126] __kasan_report.cold+0xd/0x4d [ 75.578100][ T7126] ? get_block+0x657/0x1380 [ 75.582628][ T7126] ? get_block+0x657/0x1380 [ 75.587559][ T7126] kasan_report+0x33/0x50 [ 75.591889][ T7126] check_memory_region+0x141/0x190 [ 75.597011][ T7126] get_block+0x657/0x1380 [ 75.601326][ T7126] ? block_to_path.isra.0+0x300/0x300 [ 75.606695][ T7126] ? mark_buffer_write_io_error+0x180/0x180 [ 75.610576][ T7115] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 75.612580][ T7126] ? create_empty_buffers+0x590/0x8c0 [ 75.612596][ T7126] ? __alloc_pages_nodemask+0x5f4/0x810 [ 75.612611][ T7126] ? do_raw_spin_unlock+0x171/0x260 [ 75.612630][ T7126] minix_get_block+0xe5/0x110 [ 75.621556][ T7115] minix_free_inode: bit 1 already cleared [ 75.626326][ T7126] __block_write_begin_int+0x490/0x1b00 [ 75.626341][ T7126] ? minix_rename+0x8c0/0x8c0 [ 75.626360][ T7126] ? remove_inode_buffers+0x1c0/0x1c0 [ 75.626374][ T7126] ? pagecache_get_page+0x204/0xa10 [ 75.626387][ T7126] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 75.626403][ T7126] ? wait_for_stable_page+0x11c/0x1e0 [ 75.680003][ T7126] ? minix_rename+0x8c0/0x8c0 [ 75.684689][ T7126] block_write_begin+0x58/0x2e0 [ 75.689555][ T7126] minix_write_begin+0x35/0xe0 [ 75.690244][ T7118] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 75.694321][ T7126] generic_perform_write+0x20a/0x4e0 [ 75.694342][ T7126] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 75.694354][ T7126] ? update_time+0xc0/0xc0 [ 75.694374][ T7126] ? down_write+0xdb/0x150 [ 75.724832][ T7126] __generic_file_write_iter+0x24c/0x610 [ 75.730488][ T7126] generic_file_write_iter+0x3f3/0x630 [ 75.735959][ T7126] ? __generic_file_write_iter+0x610/0x610 [ 75.741774][ T7126] ? mark_held_locks+0xe0/0xe0 [ 75.746548][ T7126] new_sync_write+0x4a2/0x700 [ 75.751232][ T7126] ? new_sync_read+0x7a0/0x7a0 [ 75.756007][ T7126] ? rcu_read_lock_any_held+0xcd/0xf0 [ 75.761384][ T7126] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 75.766674][ T7126] __vfs_write+0xc9/0x100 [ 75.771009][ T7126] vfs_write+0x268/0x5d0 [ 75.775255][ T7126] ksys_write+0x12d/0x250 [ 75.779591][ T7126] ? __ia32_sys_read+0xb0/0xb0 [ 75.784381][ T7126] ? fpregs_mark_activate+0x320/0x320 [ 75.789764][ T7126] ? trace_hardirqs_off_caller+0x55/0x230 [ 75.795564][ T7126] do_syscall_64+0xf6/0x7d0 [ 75.800086][ T7126] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 75.805981][ T7126] RIP: 0033:0x44b339 [ 75.809875][ T7126] Code: 5d ca 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 2b ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 75.829487][ T7126] RSP: 002b:00007fbdf34ebce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 75.837907][ T7126] RAX: ffffffffffffffda RBX: 00000000006ddc48 RCX: 000000000044b339 executing program [ 75.845886][ T7126] RDX: 000000000000fdef RSI: 00000000200002c0 RDI: 0000000000000008 [ 75.853856][ T7126] RBP: 00000000006ddc40 R08: 0000000000000000 R09: 0000000000000000 [ 75.861820][ T7126] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc4c [ 75.869810][ T7126] R13: 00007ffceabc179f R14: 00007fbdf34ec9c0 R15: 0000000000000001 [ 75.878893][ T7126] Kernel Offset: disabled [ 75.883259][ T7126] Rebooting in 86400 seconds..