[ 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 '10.128.0.92' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 498.117041][ T7071] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.127641][ T7071] minix_free_inode: bit 1 already cleared [ 498.145950][ T7070] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.146069][ T7076] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.163089][ T7070] minix_free_inode: bit 1 already cleared [ 498.181586][ T7080] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.190834][ T7077] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.200875][ T7080] minix_free_inode: bit 1 already cleared [ 498.207104][ T7077] minix_free_inode: bit 1 already cleared [ 498.214837][ T7076] minix_free_inode: bit 1 already cleared [ 498.227659][ T7074] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.238033][ T7074] minix_free_inode: bit 1 already cleared executing program executing program [ 498.464519][ T7100] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.474928][ T7094] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.477298][ T7095] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.491058][ T7096] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.501432][ T7096] minix_free_inode: bit 1 already cleared [ 498.511371][ T7100] minix_free_inode: bit 1 already cleared [ 498.517141][ T7095] minix_free_inode: bit 1 already cleared [ 498.523031][ T7094] minix_free_inode: bit 1 already cleared executing program [ 498.596334][ T7123] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.606494][ T7123] minix_free_inode: bit 1 already cleared [ 498.614798][ T7124] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.624904][ T7124] minix_free_inode: bit 1 already cleared [ 498.643771][ T7131] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.652785][ T7131] minix_free_inode: bit 1 already cleared executing program executing program executing program executing program executing program [ 498.962449][ T7146] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.976157][ T7142] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.992812][ T7146] minix_free_inode: bit 1 already cleared [ 498.993071][ T7149] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 498.999172][ T7142] minix_free_inode: bit 1 already cleared [ 499.018930][ T7159] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.022169][ T7149] minix_free_inode: bit 1 already cleared [ 499.039449][ T7159] minix_free_inode: bit 1 already cleared executing program [ 499.108352][ T7166] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.117451][ T7166] minix_free_inode: bit 1 already cleared [ 499.153626][ T7165] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.168487][ T7165] minix_free_inode: bit 1 already cleared [ 499.348886][ T7167] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.360002][ T7167] minix_free_inode: bit 1 already cleared [ 499.373831][ T7179] MINIX-fs: mounting unchecked file system, running fsck is recommended executing program [ 499.415188][ T7181] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.424656][ T7180] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.445859][ T7182] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.463796][ T7179] ================================================================== [ 499.472333][ T7179] BUG: KASAN: null-ptr-deref in get_block+0x657/0x1380 [ 499.479302][ T7179] Write of size 8 at addr 0000000000000000 by task syz-executor785/7179 [ 499.487629][ T7179] [ 499.489974][ T7179] CPU: 1 PID: 7179 Comm: syz-executor785 Not tainted 5.7.0-rc1-next-20200414-syzkaller #0 [ 499.499865][ T7179] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 499.509941][ T7179] Call Trace: [ 499.513342][ T7179] dump_stack+0x188/0x20d [ 499.517780][ T7179] ? get_block+0x657/0x1380 [ 499.522433][ T7179] __kasan_report.cold+0x5/0x4d [ 499.527478][ T7179] ? get_block+0x657/0x1380 [ 499.532040][ T7179] ? get_block+0x657/0x1380 [ 499.536561][ T7179] kasan_report+0x33/0x50 [ 499.540914][ T7179] check_memory_region+0x141/0x190 [ 499.546133][ T7179] get_block+0x657/0x1380 [ 499.550497][ T7179] ? block_to_path.isra.0+0x300/0x300 [ 499.556166][ T7179] ? mark_buffer_write_io_error+0x180/0x180 [ 499.562125][ T7179] ? create_empty_buffers+0x590/0x8c0 [ 499.567541][ T7179] ? __alloc_pages_nodemask+0x5f4/0x810 [ 499.573202][ T7179] ? do_raw_spin_unlock+0x171/0x260 [ 499.578873][ T7179] minix_get_block+0xe5/0x110 [ 499.583909][ T7179] __block_write_begin_int+0x490/0x1b00 [ 499.589482][ T7179] ? minix_rename+0x8c0/0x8c0 [ 499.594192][ T7179] ? remove_inode_buffers+0x1c0/0x1c0 [ 499.599676][ T7179] ? pagecache_get_page+0x204/0xa10 [ 499.604910][ T7179] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 499.611789][ T7179] ? wait_for_stable_page+0x11c/0x1e0 [ 499.617302][ T7179] ? minix_rename+0x8c0/0x8c0 [ 499.622211][ T7179] block_write_begin+0x58/0x2e0 [ 499.627089][ T7179] minix_write_begin+0x35/0xe0 [ 499.631899][ T7179] generic_perform_write+0x20a/0x4e0 [ 499.637497][ T7179] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 499.645773][ T7179] ? update_time+0xc0/0xc0 [ 499.650448][ T7179] ? down_write+0xdb/0x150 [ 499.654895][ T7179] __generic_file_write_iter+0x24c/0x610 [ 499.660655][ T7179] generic_file_write_iter+0x3f3/0x630 [ 499.666163][ T7179] ? __generic_file_write_iter+0x610/0x610 [ 499.671982][ T7179] ? mark_held_locks+0xe0/0xe0 [ 499.676865][ T7179] new_sync_write+0x4a2/0x700 [ 499.681567][ T7179] ? new_sync_read+0x7a0/0x7a0 [ 499.686477][ T7179] ? rcu_read_lock_any_held+0xcd/0xf0 [ 499.691867][ T7179] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 499.697179][ T7179] __vfs_write+0xc9/0x100 [ 499.701527][ T7179] vfs_write+0x268/0x5d0 [ 499.706307][ T7179] ksys_write+0x12d/0x250 [ 499.710659][ T7179] ? __ia32_sys_read+0xb0/0xb0 [ 499.715433][ T7179] ? filp_close+0x12f/0x170 [ 499.720044][ T7179] ? trace_hardirqs_off_caller+0x55/0x230 [ 499.727297][ T7179] do_syscall_64+0xf6/0x7d0 [ 499.731887][ T7179] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 499.737793][ T7179] RIP: 0033:0x44b209 [ 499.741701][ T7179] 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 [ 499.761403][ T7179] RSP: 002b:00007fa46e707ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 499.770020][ T7179] RAX: ffffffffffffffda RBX: 00000000006ddc28 RCX: 000000000044b209 [ 499.778001][ T7179] RDX: 000000000000fdef RSI: 00000000200004c0 RDI: 0000000000000003 [ 499.789808][ T7179] RBP: 00000000006ddc20 R08: 0000000000000012 R09: 0000000000000000 [ 499.797815][ T7179] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc2c [ 499.805982][ T7179] R13: 00007ffce43e9d4f R14: 00007fa46e7089c0 R15: 0000000000000000 executing program [ 499.814240][ T7179] ================================================================== [ 499.822393][ T7179] Disabling lock debugging due to kernel taint [ 499.854443][ T7180] minix_free_inode: bit 1 already cleared [ 499.860530][ T7181] minix_free_inode: bit 1 already cleared [ 499.868366][ T7182] minix_free_inode: bit 1 already cleared [ 499.877437][ T7209] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 499.919146][ T7179] Kernel panic - not syncing: panic_on_warn set ... [ 499.926490][ T7179] CPU: 0 PID: 7179 Comm: syz-executor785 Tainted: G B 5.7.0-rc1-next-20200414-syzkaller #0 [ 499.938183][ T7179] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 499.949706][ T7179] Call Trace: [ 499.953010][ T7179] dump_stack+0x188/0x20d [ 499.957489][ T7179] panic+0x2e3/0x75c [ 499.961494][ T7179] ? add_taint.cold+0x16/0x16 [ 499.966174][ T7179] ? preempt_schedule_common+0x5e/0xc0 [ 499.971715][ T7179] ? get_block+0x657/0x1380 [ 499.977057][ T7179] ? preempt_schedule_thunk+0x16/0x18 [ 499.982528][ T7179] ? trace_hardirqs_on+0x55/0x220 [ 499.987546][ T7179] ? get_block+0x657/0x1380 [ 499.992057][ T7179] end_report+0x4d/0x53 [ 499.996220][ T7179] __kasan_report.cold+0xd/0x4d [ 499.997357][ T7218] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 500.001065][ T7179] ? get_block+0x657/0x1380 [ 500.008935][ T7218] #PF: supervisor write access in kernel mode [ 500.013433][ T7179] ? get_block+0x657/0x1380 [ 500.019475][ T7218] #PF: error_code(0x0002) - not-present page [ 500.023959][ T7179] kasan_report+0x33/0x50 [ 500.030103][ T7218] PGD 9c9da067 P4D 9c9da067 PUD 9e055067 PMD 0 [ 500.034492][ T7179] check_memory_region+0x141/0x190 [ 500.040840][ T7218] Oops: 0002 [#1] PREEMPT SMP KASAN [ 500.046073][ T7179] get_block+0x657/0x1380 [ 500.051252][ T7218] CPU: 1 PID: 7218 Comm: syz-executor785 Tainted: G B 5.7.0-rc1-next-20200414-syzkaller #0 [ 500.055665][ T7179] ? block_to_path.isra.0+0x300/0x300 [ 500.067818][ T7218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 500.073288][ T7179] ? mark_buffer_write_io_error+0x180/0x180 [ 500.083327][ T7218] RIP: 0010:get_block+0x657/0x1380 [ 500.089286][ T7179] ? create_empty_buffers+0x590/0x8c0 [ 500.094370][ T7218] Code: 00 00 e8 1c 04 b5 ff 31 d2 be 6c 01 00 00 48 c7 c7 20 df 3e 88 49 89 c4 e8 76 68 38 ff be 08 00 00 00 4c 89 e7 e8 f9 7a 9a ff 49 0f ba 2c 24 02 40 0f 92 c6 31 ff 40 88 74 24 78 e8 42 87 5c [ 500.099720][ T7179] ? __alloc_pages_nodemask+0x5f4/0x810 [ 500.119305][ T7218] RSP: 0018:ffffc900056776f8 EFLAGS: 00010202 [ 500.124831][ T7179] ? do_raw_spin_unlock+0x171/0x260 [ 500.130974][ T7218] RAX: 0000000000000001 RBX: ffffc900056777f8 RCX: ffffffff8216ae97 [ 500.130987][ T7218] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 500.136172][ T7179] minix_get_block+0xe5/0x110 [ 500.144126][ T7218] RBP: ffffc90005677890 R08: ffff8880a7be4440 R09: fffff940004510df [ 500.152100][ T7179] __block_write_begin_int+0x490/0x1b00 [ 500.156750][ T7218] R10: 0000000000000008 R11: fffff940004510de R12: 0000000000000000 [ 500.165491][ T7179] ? minix_rename+0x8c0/0x8c0 [ 500.171438][ T7218] R13: dffffc0000000000 R14: ffffc900056777bc R15: 0000000000000c98 [ 500.179426][ T7179] ? remove_inode_buffers+0x1c0/0x1c0 [ 500.184072][ T7218] FS: 00007fa46e6c6700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 500.192226][ T7179] ? pagecache_get_page+0x204/0xa10 [ 500.197594][ T7218] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 500.207211][ T7179] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 500.212394][ T7218] CR2: 0000000000000000 CR3: 00000000910d6000 CR4: 00000000001406e0 [ 500.218975][ T7179] ? wait_for_stable_page+0x11c/0x1e0 [ 500.225375][ T7218] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 500.233526][ T7179] ? minix_rename+0x8c0/0x8c0 [ 500.238876][ T7218] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 500.246926][ T7179] block_write_begin+0x58/0x2e0 [ 500.251666][ T7218] Call Trace: [ 500.259725][ T7179] minix_write_begin+0x35/0xe0 [ 500.264562][ T7218] ? block_to_path.isra.0+0x300/0x300 [ 500.267915][ T7179] generic_perform_write+0x20a/0x4e0 [ 500.273012][ T7218] ? mark_buffer_write_io_error+0x180/0x180 [ 500.273033][ T7218] ? create_empty_buffers+0x590/0x8c0 [ 500.278499][ T7179] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 500.283767][ T7218] ? __alloc_pages_nodemask+0x533/0x810 [ 500.289801][ T7179] ? update_time+0xc0/0xc0 [ 500.295164][ T7218] ? do_raw_spin_unlock+0x171/0x260 [ 500.303303][ T7179] ? down_write+0xdb/0x150 [ 500.308823][ T7218] minix_get_block+0xe5/0x110 [ 500.313258][ T7179] __generic_file_write_iter+0x24c/0x610 [ 500.318504][ T7218] __block_write_begin_int+0x490/0x1b00 [ 500.322913][ T7179] generic_file_write_iter+0x3f3/0x630 [ 500.327580][ T7218] ? minix_rename+0x8c0/0x8c0 [ 500.333189][ T7179] ? __generic_file_write_iter+0x610/0x610 [ 500.338714][ T7218] ? remove_inode_buffers+0x1c0/0x1c0 [ 500.344413][ T7179] ? mark_held_locks+0xe0/0xe0 [ 500.349084][ T7218] ? pagecache_get_page+0x204/0xa10 [ 500.355034][ T7179] new_sync_write+0x4a2/0x700 [ 500.360409][ T7218] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 500.365149][ T7179] ? new_sync_read+0x7a0/0x7a0 [ 500.370416][ T7218] ? wait_for_stable_page+0x11c/0x1e0 [ 500.375083][ T7179] ? rcu_read_lock_any_held+0xcd/0xf0 [ 500.381470][ T7218] ? minix_rename+0x8c0/0x8c0 [ 500.386209][ T7179] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 500.391567][ T7218] block_write_begin+0x58/0x2e0 [ 500.396917][ T7179] __vfs_write+0xc9/0x100 [ 500.401580][ T7218] minix_write_begin+0x35/0xe0 [ 500.406842][ T7179] vfs_write+0x268/0x5d0 [ 500.411673][ T7218] generic_perform_write+0x20a/0x4e0 [ 500.415978][ T7179] ksys_write+0x12d/0x250 [ 500.420720][ T7218] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 500.425027][ T7179] ? __ia32_sys_read+0xb0/0xb0 [ 500.430287][ T7218] ? update_time+0xc0/0xc0 [ 500.434588][ T7179] ? filp_close+0x12f/0x170 [ 500.442628][ T7218] ? down_write+0xdb/0x150 [ 500.447365][ T7179] ? trace_hardirqs_off_caller+0x55/0x230 [ 500.451845][ T7218] __generic_file_write_iter+0x24c/0x610 [ 500.456323][ T7179] do_syscall_64+0xf6/0x7d0 [ 500.460898][ T7218] generic_file_write_iter+0x3f3/0x630 [ 500.466591][ T7179] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 500.472197][ T7218] ? __generic_file_write_iter+0x610/0x610 [ 500.476670][ T7179] RIP: 0033:0x44b209 [ 500.482110][ T7218] ? mark_held_locks+0xe0/0xe0 [ 500.488353][ T7179] 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 [ 500.494179][ T7218] ? do_dup2+0x520/0x520 [ 500.498154][ T7179] RSP: 002b:00007fa46e707ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 500.502909][ T7218] new_sync_write+0x4a2/0x700 [ 500.522497][ T7179] RAX: ffffffffffffffda RBX: 00000000006ddc28 RCX: 000000000044b209 [ 500.526731][ T7218] ? new_sync_read+0x7a0/0x7a0 [ 500.535214][ T7179] RDX: 000000000000fdef RSI: 00000000200004c0 RDI: 0000000000000003 [ 500.539888][ T7218] ? lock_release+0x800/0x800 [ 500.547952][ T7179] RBP: 00000000006ddc20 R08: 0000000000000012 R09: 0000000000000000 [ 500.552723][ T7218] ? mutex_trylock+0x2c0/0x2c0 [ 500.560780][ T7179] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc2c [ 500.565542][ T7218] ? security_file_permission+0x8c/0x470 [ 500.573401][ T7179] R13: 00007ffce43e9d4f R14: 00007fa46e7089c0 R15: 0000000000000000 [ 500.578174][ T7218] __vfs_write+0xc9/0x100 [ 500.604702][ T7218] vfs_write+0x268/0x5d0 [ 500.609032][ T7218] ksys_write+0x12d/0x250 [ 500.613532][ T7218] ? __ia32_sys_read+0xb0/0xb0 [ 500.618372][ T7218] ? fpregs_mark_activate+0x320/0x320 [ 500.623831][ T7218] ? trace_hardirqs_off_caller+0x55/0x230 [ 500.629634][ T7218] do_syscall_64+0xf6/0x7d0 [ 500.634140][ T7218] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 500.640036][ T7218] RIP: 0033:0x44b209 [ 500.643929][ T7218] 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 [ 500.663618][ T7218] RSP: 002b:00007fa46e6c5ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 500.672025][ T7218] RAX: ffffffffffffffda RBX: 00000000006ddc48 RCX: 000000000044b209 [ 500.680080][ T7218] RDX: 000000000000fdef RSI: 00000000200004c0 RDI: 0000000000000007 [ 500.688055][ T7218] RBP: 00000000006ddc40 R08: 0000000000000012 R09: 0000000000000000 [ 500.696012][ T7218] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc4c [ 500.704164][ T7218] R13: 00007ffce43e9d4f R14: 00007fa46e6c69c0 R15: 0000000000000001 [ 500.712420][ T7218] Modules linked in: [ 500.716464][ T7218] CR2: 0000000000000000 [ 500.722395][ T7179] Kernel Offset: disabled [ 500.726827][ T7179] Rebooting in 86400 seconds..