[ 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... [ 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 '10.128.0.37' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 67.079805][ T7181] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.090906][ T7181] minix_free_inode: bit 1 already cleared [ 67.111784][ T7188] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.122077][ T7188] minix_free_inode: bit 1 already cleared [ 67.130671][ T7185] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.140780][ T7185] minix_free_inode: bit 1 already cleared [ 67.186472][ T7180] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.186588][ T7187] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.195458][ T7180] minix_free_inode: bit 1 already cleared [ 67.209416][ T7187] minix_free_inode: bit 1 already cleared [ 67.219698][ T7190] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.229444][ T7190] minix_free_inode: bit 1 already cleared [ 67.292102][ T7181] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.307958][ T7181] minix_free_inode: bit 1 already cleared executing program executing program executing program [ 67.412508][ T7223] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.428507][ T7210] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.431074][ T7207] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.440087][ T7204] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.463216][ T7223] minix_free_inode: bit 1 already cleared [ 67.473993][ T7210] minix_free_inode: bit 1 already cleared [ 67.492494][ T7207] minix_free_inode: bit 1 already cleared [ 67.498844][ T7204] minix_free_inode: bit 1 already cleared executing program executing program executing program [ 67.792723][ T7244] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 67.863701][ T7260] ================================================================== [ 67.871916][ T7260] BUG: KASAN: null-ptr-deref in get_block+0x657/0x1380 [ 67.878918][ T7260] Write of size 8 at addr 0000000000000000 by task syz-executor733/7260 [ 67.887506][ T7260] [ 67.889854][ T7260] CPU: 0 PID: 7260 Comm: syz-executor733 Not tainted 5.7.0-rc1-next-20200414-syzkaller #0 [ 67.899755][ T7260] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.909812][ T7260] Call Trace: [ 67.913111][ T7260] dump_stack+0x188/0x20d [ 67.917446][ T7260] ? get_block+0x657/0x1380 [ 67.922006][ T7260] __kasan_report.cold+0x5/0x4d [ 67.926859][ T7260] ? get_block+0x657/0x1380 [ 67.931352][ T7260] ? get_block+0x657/0x1380 [ 67.935839][ T7260] kasan_report+0x33/0x50 [ 67.940345][ T7260] check_memory_region+0x141/0x190 [ 67.945447][ T7260] get_block+0x657/0x1380 [ 67.949786][ T7260] ? block_to_path.isra.0+0x300/0x300 [ 67.955150][ T7260] ? mark_buffer_write_io_error+0x180/0x180 [ 67.961177][ T7260] ? create_empty_buffers+0x590/0x8c0 [ 67.966548][ T7260] ? __alloc_pages_nodemask+0x5f4/0x810 [ 67.972194][ T7260] ? do_raw_spin_unlock+0x171/0x260 [ 67.977512][ T7260] minix_get_block+0xe5/0x110 [ 67.982334][ T7260] __block_write_begin_int+0x490/0x1b00 [ 67.987957][ T7260] ? minix_rename+0x8c0/0x8c0 [ 67.992641][ T7260] ? remove_inode_buffers+0x1c0/0x1c0 [ 67.998216][ T7260] ? pagecache_get_page+0x204/0xa10 [ 68.003566][ T7260] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 68.010157][ T7260] ? wait_for_stable_page+0x11c/0x1e0 [ 68.015645][ T7260] ? minix_rename+0x8c0/0x8c0 [ 68.020326][ T7260] block_write_begin+0x58/0x2e0 [ 68.025187][ T7260] minix_write_begin+0x35/0xe0 [ 68.029950][ T7260] generic_perform_write+0x20a/0x4e0 [ 68.035237][ T7260] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 68.043302][ T7260] ? update_time+0xc0/0xc0 [ 68.047736][ T7260] ? down_write+0xdb/0x150 [ 68.052150][ T7260] __generic_file_write_iter+0x24c/0x610 [ 68.057778][ T7260] generic_file_write_iter+0x3f3/0x630 [ 68.063229][ T7260] ? __generic_file_write_iter+0x610/0x610 [ 68.069040][ T7260] ? mark_held_locks+0xe0/0xe0 [ 68.073823][ T7260] new_sync_write+0x4a2/0x700 [ 68.078557][ T7260] ? new_sync_read+0x7a0/0x7a0 [ 68.083445][ T7260] ? rcu_read_lock_any_held+0xcd/0xf0 [ 68.088842][ T7260] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 68.094141][ T7260] __vfs_write+0xc9/0x100 [ 68.098477][ T7260] vfs_write+0x268/0x5d0 [ 68.103158][ T7260] ksys_write+0x12d/0x250 [ 68.107527][ T7260] ? __ia32_sys_read+0xb0/0xb0 [ 68.112290][ T7260] ? fpregs_mark_activate+0x320/0x320 [ 68.117681][ T7260] ? trace_hardirqs_off_caller+0x55/0x230 [ 68.123587][ T7260] do_syscall_64+0xf6/0x7d0 [ 68.128111][ T7260] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 68.134002][ T7260] RIP: 0033:0x44b339 [ 68.138073][ T7260] 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 [ 68.157889][ T7260] RSP: 002b:00007f1e0e153ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 68.166312][ T7260] RAX: ffffffffffffffda RBX: 00000000006ddc48 RCX: 000000000044b339 [ 68.174656][ T7260] RDX: 000000000000fdef RSI: 00000000200002c0 RDI: 0000000000000008 [ 68.182782][ T7260] RBP: 00000000006ddc40 R08: 0000000000000000 R09: 0000000000000000 [ 68.190761][ T7260] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc4c [ 68.198734][ T7260] R13: 00007fff20eeffdf R14: 00007f1e0e1549c0 R15: 0000000000000001 [ 68.206720][ T7260] ================================================================== [ 68.214882][ T7260] Disabling lock debugging due to kernel taint [ 68.234450][ T7260] Kernel panic - not syncing: panic_on_warn set ... [ 68.241265][ T7260] CPU: 0 PID: 7260 Comm: syz-executor733 Tainted: G B 5.7.0-rc1-next-20200414-syzkaller #0 [ 68.252529][ T7260] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.262677][ T7260] Call Trace: [ 68.265962][ T7260] dump_stack+0x188/0x20d [ 68.270339][ T7260] panic+0x2e3/0x75c [ 68.274294][ T7260] ? add_taint.cold+0x16/0x16 [ 68.278977][ T7260] ? preempt_schedule_common+0x5e/0xc0 [ 68.284601][ T7260] ? get_block+0x657/0x1380 [ 68.289242][ T7260] ? preempt_schedule_thunk+0x16/0x18 [ 68.294620][ T7260] ? trace_hardirqs_on+0x55/0x220 [ 68.299632][ T7260] ? get_block+0x657/0x1380 [ 68.304121][ T7260] end_report+0x4d/0x53 [ 68.308263][ T7260] __kasan_report.cold+0xd/0x4d [ 68.313097][ T7260] ? get_block+0x657/0x1380 [ 68.317584][ T7260] ? get_block+0x657/0x1380 [ 68.322071][ T7260] kasan_report+0x33/0x50 [ 68.326402][ T7260] check_memory_region+0x141/0x190 [ 68.331525][ T7260] get_block+0x657/0x1380 [ 68.335874][ T7260] ? block_to_path.isra.0+0x300/0x300 [ 68.341317][ T7260] ? mark_buffer_write_io_error+0x180/0x180 [ 68.347226][ T7260] ? create_empty_buffers+0x590/0x8c0 [ 68.352643][ T7260] ? __alloc_pages_nodemask+0x5f4/0x810 [ 68.358469][ T7260] ? do_raw_spin_unlock+0x171/0x260 [ 68.363844][ T7260] minix_get_block+0xe5/0x110 [ 68.368515][ T7260] __block_write_begin_int+0x490/0x1b00 [ 68.374048][ T7260] ? minix_rename+0x8c0/0x8c0 [ 68.378942][ T7260] ? remove_inode_buffers+0x1c0/0x1c0 [ 68.384302][ T7260] ? pagecache_get_page+0x204/0xa10 [ 68.389552][ T7260] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 68.396012][ T7260] ? wait_for_stable_page+0x11c/0x1e0 [ 68.401390][ T7260] ? minix_rename+0x8c0/0x8c0 [ 68.406082][ T7260] block_write_begin+0x58/0x2e0 [ 68.411055][ T7260] minix_write_begin+0x35/0xe0 [ 68.415817][ T7260] generic_perform_write+0x20a/0x4e0 [ 68.421298][ T7260] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 68.429371][ T7260] ? update_time+0xc0/0xc0 [ 68.433810][ T7260] ? down_write+0xdb/0x150 [ 68.438334][ T7260] __generic_file_write_iter+0x24c/0x610 [ 68.443972][ T7260] generic_file_write_iter+0x3f3/0x630 [ 68.449425][ T7260] ? __generic_file_write_iter+0x610/0x610 [ 68.455229][ T7260] ? mark_held_locks+0xe0/0xe0 [ 68.459996][ T7260] new_sync_write+0x4a2/0x700 [ 68.464661][ T7260] ? new_sync_read+0x7a0/0x7a0 [ 68.469412][ T7260] ? rcu_read_lock_any_held+0xcd/0xf0 [ 68.474765][ T7260] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 68.480047][ T7260] __vfs_write+0xc9/0x100 [ 68.484379][ T7260] vfs_write+0x268/0x5d0 [ 68.488608][ T7260] ksys_write+0x12d/0x250 [ 68.492923][ T7260] ? __ia32_sys_read+0xb0/0xb0 [ 68.497678][ T7260] ? fpregs_mark_activate+0x320/0x320 [ 68.503129][ T7260] ? trace_hardirqs_off_caller+0x55/0x230 [ 68.508977][ T7260] do_syscall_64+0xf6/0x7d0 [ 68.513507][ T7260] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 68.519411][ T7260] RIP: 0033:0x44b339 [ 68.523292][ T7260] 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 [ 68.542928][ T7260] RSP: 002b:00007f1e0e153ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 68.551346][ T7260] RAX: ffffffffffffffda RBX: 00000000006ddc48 RCX: 000000000044b339 [ 68.559425][ T7260] RDX: 000000000000fdef RSI: 00000000200002c0 RDI: 0000000000000008 [ 68.567401][ T7260] RBP: 00000000006ddc40 R08: 0000000000000000 R09: 0000000000000000 [ 68.575373][ T7260] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc4c [ 68.583481][ T7260] R13: 00007fff20eeffdf R14: 00007f1e0e1549c0 R15: 0000000000000001 [ 68.592968][ T7260] Kernel Offset: disabled [ 68.597321][ T7260] Rebooting in 86400 seconds..