[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 84.983902][ T27] audit: type=1800 audit(1584441063.990:25): pid=9293 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 85.004555][ T27] audit: type=1800 audit(1584441063.990:26): pid=9293 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 85.025281][ T27] audit: type=1800 audit(1584441063.990:27): pid=9293 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. syzkaller login: [ 109.305442][ T9456] IPVS: ftp: loaded support on port[0] = 21 [ 109.313356][ T9455] IPVS: ftp: loaded support on port[0] = 21 [ 109.328092][ T9454] IPVS: ftp: loaded support on port[0] = 21 [ 109.328112][ T9457] IPVS: ftp: loaded support on port[0] = 21 [ 109.336549][ T9459] IPVS: ftp: loaded support on port[0] = 21 [ 109.342511][ T9458] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program [ 109.526553][ T9463] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.528603][ T9464] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.565884][ T9463] minix_free_inode: bit 1 already cleared [ 109.579836][ T9464] minix_free_inode: bit 1 already cleared [ 109.598801][ T9472] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.628160][ T9472] minix_free_inode: bit 1 already cleared [ 109.647071][ T9473] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.671582][ T9473] minix_free_inode: bit 1 already cleared [ 109.702176][ T9474] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.711761][ T9478] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.733640][ T9478] minix_free_inode: bit 1 already cleared [ 109.740662][ T9474] minix_free_inode: bit 1 already cleared [ 109.802856][ T9472] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.812622][ T9472] minix_free_inode: bit 1 already cleared executing program executing program [ 109.887225][ T9463] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.897208][ T9463] minix_free_inode: bit 1 already cleared executing program executing program [ 109.965249][ T9505] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 109.977967][ T9505] minix_free_inode: bit 1 already cleared [ 110.003646][ T9504] MINIX-fs: mounting unchecked file system, running fsck is recommended executing program [ 110.032295][ T9505] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 110.041651][ T9513] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 110.045929][ T9505] minix_free_inode: bit 1 already cleared [ 110.075799][ T9513] minix_free_inode: bit 1 already cleared [ 110.081734][ T9504] minix_free_inode: bit 1 already cleared [ 110.095275][ T9514] MINIX-fs: mounting unchecked file system, running fsck is recommended executing program [ 110.136039][ T9514] minix_free_inode: bit 1 already cleared executing program executing program executing program [ 110.376848][ T9520] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 110.389100][ T9535] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 110.397663][ T9535] minix_free_inode: bit 1 already cleared [ 110.408880][ T9543] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 110.418234][ T9543] minix_free_inode: bit 1 already cleared [ 110.427630][ T9529] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 110.433761][ T9548] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 110.438911][ T9520] minix_free_inode: bit 1 already cleared [ 110.451187][ T9537] ================================================================== [ 110.459384][ T9537] BUG: KASAN: null-ptr-deref in get_block+0x657/0x1380 [ 110.466226][ T9537] Write of size 8 at addr 0000000000000000 by task syz-executor110/9537 [ 110.474522][ T9537] executing program [ 110.476867][ T9537] CPU: 0 PID: 9537 Comm: syz-executor110 Not tainted 5.6.0-rc6-syzkaller #0 [ 110.485666][ T9537] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 110.495709][ T9537] Call Trace: [ 110.498991][ T9537] dump_stack+0x188/0x20d [ 110.503322][ T9537] ? get_block+0x657/0x1380 [ 110.507837][ T9537] ? get_block+0x657/0x1380 [ 110.512368][ T9537] __kasan_report.cold+0x5/0x32 [ 110.517671][ T9537] ? get_block+0x657/0x1380 [ 110.522190][ T9537] kasan_report+0xe/0x20 [ 110.526447][ T9537] check_memory_region+0x128/0x190 [ 110.531573][ T9537] get_block+0x657/0x1380 [ 110.535945][ T9537] ? block_to_path.isra.0+0x300/0x300 [ 110.541331][ T9537] ? mark_buffer_write_io_error+0x180/0x180 [ 110.547243][ T9537] ? __x64_sys_fspick+0x2e7/0x420 [ 110.552286][ T9537] ? create_empty_buffers+0x590/0x8c0 [ 110.557783][ T9537] ? __alloc_pages_nodemask+0x5fc/0x820 [ 110.563352][ T9537] ? do_raw_spin_unlock+0x171/0x260 [ 110.568569][ T9537] minix_get_block+0xe5/0x110 [ 110.573302][ T9537] __block_write_begin_int+0x490/0x1b00 [ 110.578849][ T9537] ? minix_rename+0x8c0/0x8c0 [ 110.583552][ T9537] ? __breadahead+0xf0/0xf0 [ 110.588061][ T9537] ? pagecache_get_page+0x204/0xa10 [ 110.593276][ T9537] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 110.599698][ T9537] ? wait_for_stable_page+0x11c/0x1e0 [ 110.605164][ T9537] ? minix_rename+0x8c0/0x8c0 [ 110.609837][ T9537] block_write_begin+0x58/0x2e0 [ 110.614691][ T9537] minix_write_begin+0x35/0xe0 [ 110.619452][ T9537] generic_perform_write+0x20a/0x4e0 [ 110.624759][ T9537] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 110.632842][ T9537] ? update_time+0xc0/0xc0 [ 110.637278][ T9537] ? down_write+0xdb/0x150 [ 110.641701][ T9537] __generic_file_write_iter+0x24c/0x610 [ 110.647336][ T9537] generic_file_write_iter+0x3f0/0x62d [ 110.652820][ T9537] ? __generic_file_write_iter+0x610/0x610 [ 110.658644][ T9537] ? __lock_acquire+0x2413/0x3ca0 [ 110.663718][ T9537] new_sync_write+0x49c/0x700 [ 110.668430][ T9537] ? new_sync_read+0x790/0x790 [ 110.673206][ T9537] ? mark_held_locks+0xe0/0xe0 [ 110.677965][ T9537] ? rcu_read_lock_any_held+0xcd/0xf0 [ 110.683336][ T9537] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 110.688731][ T9537] __vfs_write+0xc9/0x100 [ 110.693083][ T9537] vfs_write+0x262/0x5c0 [ 110.697326][ T9537] ksys_write+0x127/0x250 [ 110.701653][ T9537] ? __ia32_sys_read+0xb0/0xb0 [ 110.706410][ T9537] ? fpregs_mark_activate+0x320/0x320 [ 110.711774][ T9537] ? trace_hardirqs_off_caller+0x55/0x230 [ 110.717492][ T9537] do_syscall_64+0xf6/0x7d0 [ 110.722003][ T9537] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 110.727888][ T9537] RIP: 0033:0x44b389 [ 110.731772][ T9537] Code: fd 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 cb ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 110.751370][ T9537] RSP: 002b:00007f4e9f99ace8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 110.759768][ T9537] RAX: ffffffffffffffda RBX: 00000000006ddc38 RCX: 000000000044b389 [ 110.767738][ T9537] RDX: 000000000000fdef RSI: 00000000200004c0 RDI: 0000000000000005 [ 110.775704][ T9537] RBP: 00000000006ddc30 R08: 0000000000000012 R09: 0000000000000000 [ 110.783661][ T9537] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc3c [ 110.791791][ T9537] R13: 00007ffcd0e441ef R14: 00007f4e9f99b9c0 R15: 0000000000000001 [ 110.799764][ T9537] ================================================================== [ 110.807804][ T9537] Disabling lock debugging due to kernel taint [ 110.815525][ T9548] minix_free_inode: bit 1 already cleared [ 110.821907][ T9537] Kernel panic - not syncing: panic_on_warn set ... [ 110.828510][ T9537] CPU: 0 PID: 9537 Comm: syz-executor110 Tainted: G B 5.6.0-rc6-syzkaller #0 [ 110.838660][ T9537] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 110.848723][ T9537] Call Trace: [ 110.852083][ T9537] dump_stack+0x188/0x20d [ 110.856417][ T9537] panic+0x2e3/0x75c [ 110.860304][ T9537] ? add_taint.cold+0x16/0x16 [ 110.864982][ T9537] ? preempt_schedule_common+0x5e/0xc0 [ 110.870425][ T9537] ? get_block+0x657/0x1380 [ 110.874923][ T9537] ? ___preempt_schedule+0x16/0x18 [ 110.880016][ T9537] ? trace_hardirqs_on+0x55/0x220 [ 110.885018][ T9537] ? get_block+0x657/0x1380 [ 110.889498][ T9537] end_report+0x43/0x49 [ 110.893632][ T9537] ? get_block+0x657/0x1380 [ 110.898122][ T9537] __kasan_report.cold+0xd/0x32 [ 110.902952][ T9537] ? get_block+0x657/0x1380 [ 110.907444][ T9537] kasan_report+0xe/0x20 [ 110.911674][ T9537] check_memory_region+0x128/0x190 [ 110.916771][ T9537] get_block+0x657/0x1380 [ 110.921091][ T9537] ? block_to_path.isra.0+0x300/0x300 [ 110.926454][ T9537] ? mark_buffer_write_io_error+0x180/0x180 [ 110.932553][ T9537] ? __x64_sys_fspick+0x2e7/0x420 [ 110.937581][ T9537] ? create_empty_buffers+0x590/0x8c0 [ 110.942976][ T9537] ? __alloc_pages_nodemask+0x5fc/0x820 [ 110.948516][ T9537] ? do_raw_spin_unlock+0x171/0x260 [ 110.953736][ T9537] minix_get_block+0xe5/0x110 [ 110.958419][ T9537] __block_write_begin_int+0x490/0x1b00 [ 110.963949][ T9537] ? minix_rename+0x8c0/0x8c0 [ 110.968621][ T9537] ? __breadahead+0xf0/0xf0 [ 110.973104][ T9537] ? pagecache_get_page+0x204/0xa10 [ 110.978283][ T9537] ? balance_dirty_pages_ratelimited+0x160/0x1d50 [ 110.984703][ T9537] ? wait_for_stable_page+0x11c/0x1e0 [ 110.990060][ T9537] ? minix_rename+0x8c0/0x8c0 [ 110.994720][ T9537] block_write_begin+0x58/0x2e0 [ 110.999563][ T9537] minix_write_begin+0x35/0xe0 [ 111.004327][ T9537] generic_perform_write+0x20a/0x4e0 [ 111.009861][ T9537] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4a0/0x4a0 [ 111.017914][ T9537] ? update_time+0xc0/0xc0 [ 111.022329][ T9537] ? down_write+0xdb/0x150 [ 111.026733][ T9537] __generic_file_write_iter+0x24c/0x610 [ 111.032525][ T9537] generic_file_write_iter+0x3f0/0x62d [ 111.037970][ T9537] ? __generic_file_write_iter+0x610/0x610 [ 111.043809][ T9537] ? __lock_acquire+0x2413/0x3ca0 [ 111.048818][ T9537] new_sync_write+0x49c/0x700 [ 111.053519][ T9537] ? new_sync_read+0x790/0x790 [ 111.058287][ T9537] ? mark_held_locks+0xe0/0xe0 [ 111.063151][ T9537] ? rcu_read_lock_any_held+0xcd/0xf0 [ 111.068555][ T9537] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 111.073846][ T9537] __vfs_write+0xc9/0x100 [ 111.078172][ T9537] vfs_write+0x262/0x5c0 [ 111.082398][ T9537] ksys_write+0x127/0x250 [ 111.086714][ T9537] ? __ia32_sys_read+0xb0/0xb0 [ 111.091486][ T9537] ? fpregs_mark_activate+0x320/0x320 [ 111.096872][ T9537] ? trace_hardirqs_off_caller+0x55/0x230 [ 111.104043][ T9537] do_syscall_64+0xf6/0x7d0 [ 111.109794][ T9537] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 111.116075][ T9537] RIP: 0033:0x44b389 [ 111.120386][ T9537] Code: fd 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 cb ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 111.141827][ T9537] RSP: 002b:00007f4e9f99ace8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 111.150791][ T9537] RAX: ffffffffffffffda RBX: 00000000006ddc38 RCX: 000000000044b389 [ 111.158861][ T9537] RDX: 000000000000fdef RSI: 00000000200004c0 RDI: 0000000000000005 [ 111.166818][ T9537] RBP: 00000000006ddc30 R08: 0000000000000012 R09: 0000000000000000 [ 111.174865][ T9537] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc3c [ 111.182906][ T9537] R13: 00007ffcd0e441ef R14: 00007f4e9f99b9c0 R15: 0000000000000001 [ 111.192500][ T9537] Kernel Offset: disabled [ 111.196924][ T9537] Rebooting in 86400 seconds..