[  OK  ] Started Getty on tty4.
[  OK  ] Started Getty on tty3.
[  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.
[   58.037301][  T635] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:5/635
[   58.046700][  T635] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   58.052637][  T635] CPU: 0 PID: 635 Comm: kworker/u4:5 Not tainted 5.8.0-rc1-syzkaller #0
[   58.061337][  T635] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   58.071412][  T635] Workqueue: writeback wb_workfn (flush-8:0)
[   58.077491][  T635] Call Trace:
[   58.080795][  T635]  dump_stack+0x18f/0x20d
[   58.085156][  T635]  check_preemption_disabled+0x20d/0x220
[   58.090815][  T635]  ext4_mb_new_blocks+0xa4d/0x3b70
[   58.095942][  T635]  ? ext4_find_extent+0x81a/0xad0
[   58.101686][  T635]  ? ext4_ext_search_right+0x2ca/0xb20
[   58.107192][  T635]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   58.112976][  T635]  ext4_ext_map_blocks+0x201b/0x33e0
[   58.118319][  T635]  ? ext4_ext_release+0x10/0x10
[   58.123208][  T635]  ? down_write_killable+0x170/0x170
[   58.128504][  T635]  ? ext4_es_lookup_extent+0x41d/0xd10
[   58.133983][  T635]  ext4_map_blocks+0x4cb/0x1640
[   58.138883][  T635]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   58.144197][  T635]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   58.149763][  T635]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   58.155771][  T635]  ? ext4_alloc_io_end_vec+0x145/0x1c0
[   58.161255][  T635]  ext4_writepages+0x1a7b/0x33c0
[   58.166231][  T635]  ? __ext4_mark_inode_dirty+0x940/0x940
[   58.171877][  T635]  ? __lock_acquire+0x2224/0x48b0
[   58.177638][  T635]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   58.183639][  T635]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   58.189660][  T635]  ? __ext4_mark_inode_dirty+0x940/0x940
[   58.195344][  T635]  ? do_writepages+0xfa/0x2a0
[   58.200031][  T635]  do_writepages+0xfa/0x2a0
[   58.204813][  T635]  ? page_writeback_cpu_online+0x10/0x10
[   58.210467][  T635]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   58.216055][  T635]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   58.222317][  T635]  ? lock_downgrade+0x840/0x840
[   58.227185][  T635]  __writeback_single_inode+0x12a/0x13d0
[   58.232964][  T635]  ? _raw_spin_unlock+0x24/0x40
[   58.237834][  T635]  ? wbc_attach_and_unlock_inode+0x60a/0x9c0
[   58.246009][  T635]  writeback_sb_inodes+0x515/0xdc0
[   58.251163][  T635]  ? __writeback_single_inode+0x13d0/0x13d0
[   58.257275][  T635]  __writeback_inodes_wb+0xc3/0x250
[   58.262513][  T635]  wb_writeback+0x8db/0xd50
[   58.267037][  T635]  ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0
[   58.278358][  T635]  ? _find_next_bit.constprop.0+0x1a3/0x200
[   58.284270][  T635]  ? cpumask_next+0x3c/0x40
[   58.288786][  T635]  ? get_nr_dirty_inodes+0xd6/0x130
[   58.294005][  T635]  wb_workfn+0xab3/0x1090
[   58.298358][  T635]  ? inode_wait_for_writeback+0x30/0x30
[   58.304196][  T635]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   58.309931][  T635]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   58.315934][  T635]  process_one_work+0x965/0x1690
[   58.320899][  T635]  ? lock_release+0x800/0x800
[   58.325593][  T635]  ? pwq_dec_nr_in_flight+0x310/0x310
[   58.330996][  T635]  ? rwlock_bug.part.0+0x90/0x90
[   58.335955][  T635]  worker_thread+0x96/0xe10
[   58.340485][  T635]  ? process_one_work+0x1690/0x1690
[   58.345683][  T635]  kthread+0x3b5/0x4a0
[   58.349739][  T635]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   58.355445][  T635]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   58.361238][  T635]  ret_from_fork+0x1f/0x30
         Starting Load/Save RF Kill Switch Status...
[   58.437935][ T6732] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6732
[   58.448055][ T6732] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   58.453950][ T6732] CPU: 1 PID: 6732 Comm: systemd-rfkill Not tainted 5.8.0-rc1-syzkaller #0
[   58.462521][ T6732] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   58.472917][ T6732] Call Trace:
[   58.476193][ T6732]  dump_stack+0x18f/0x20d
[   58.480529][ T6732]  check_preemption_disabled+0x20d/0x220
[   58.486161][ T6732]  ext4_mb_new_blocks+0xa4d/0x3b70
[   58.491284][ T6732]  ? ext4_ext_search_right+0x2ca/0xb20
[   58.496741][ T6732]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   58.502455][ T6732]  ext4_ext_map_blocks+0x201b/0x33e0
[   58.507744][ T6732]  ? ext4_ext_release+0x10/0x10
[   58.512584][ T6732]  ? down_write_killable+0x170/0x170
[   58.517955][ T6732]  ? ext4_es_lookup_extent+0x41d/0xd10
[   58.523406][ T6732]  ext4_map_blocks+0x4cb/0x1640
[   58.528252][ T6732]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   58.533571][ T6732]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   58.539120][ T6732]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   58.545166][ T6732]  ? prandom_u32_state+0xe/0x170
[   58.550113][ T6732]  ? __brelse+0x84/0xa0
[   58.554249][ T6732]  ? __ext4_new_inode+0x144/0x55e0
[   58.559352][ T6732]  ext4_getblk+0xad/0x520
[   58.563689][ T6732]  ? ext4_iomap_overwrite_begin+0xa0/0xa0
[   58.569455][ T6732]  ? ext4_free_inode+0x1700/0x1700
[   58.574590][ T6732]  ext4_bread+0x7c/0x380
[   58.578820][ T6732]  ? ext4_getblk+0x520/0x520
[   58.583414][ T6732]  ? dquot_get_next_dqblk+0x180/0x180
[   58.588789][ T6732]  ext4_append+0x153/0x360
[   58.593190][ T6732]  ext4_mkdir+0x5e0/0xdf0
[   58.597535][ T6732]  ? ext4_rmdir+0xde0/0xde0
[   58.602041][ T6732]  ? security_inode_permission+0xc4/0xf0
[   58.607681][ T6732]  vfs_mkdir+0x419/0x690
[   58.611906][ T6732]  do_mkdirat+0x21e/0x280
[   58.616213][ T6732]  ? __ia32_sys_mknod+0xb0/0xb0
[   58.621137][ T6732]  ? do_syscall_64+0x1c/0xe0
[   58.625723][ T6732]  ? lockdep_hardirqs_on_prepare+0x3a2/0x590
[   58.631788][ T6732]  do_syscall_64+0x60/0xe0
[   58.636187][ T6732]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   58.642071][ T6732] RIP: 0033:0x7fc8a85ac687
[   58.646480][ T6732] Code: Bad RIP value.
[   58.650828][ T6732] RSP: 002b:00007fff87829168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
[   58.650856][ T6732] RAX: ffffffffffffffda RBX: 000055ba1775f985 RCX: 00007fc8a85ac687
[   58.650866][ T6732] RDX: 00007fff87829030 RSI: 00000000000001ed RDI: 000055ba1775f985
[   58.650876][ T6732] RBP: 00007fc8a85ac680 R08: 0000000000000100 R09: 0000000000000000
[   58.650885][ T6732] R10: 000055ba1775f980 R11: 0000000000000246 R12: 00000000000001ed
[   58.650894][ T6732] R13: 00007fff878292f0 R14: 0000000000000000 R15: 0000000000000000


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts.
2020/06/15 17:38:10 fuzzer started
2020/06/15 17:38:11 connecting to host at 10.128.0.26:39593
2020/06/15 17:38:11 checking machine...
2020/06/15 17:38:11 checking revisions...
2020/06/15 17:38:11 testing simple program...
syzkaller login: [   63.405934][    T7] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:0/7
[   63.414997][    T7] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   63.422118][    T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0
[   63.430293][    T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   63.440468][    T7] Workqueue: writeback wb_workfn (flush-8:0)
[   63.446460][    T7] Call Trace:
[   63.449847][    T7]  dump_stack+0x18f/0x20d
[   63.454190][    T7]  check_preemption_disabled+0x20d/0x220
[   63.459835][    T7]  ext4_mb_new_blocks+0xa4d/0x3b70
[   63.464969][    T7]  ? ext4_find_extent+0x81a/0xad0
[   63.470015][    T7]  ? ext4_ext_search_right+0x2ca/0xb20
[   63.475504][    T7]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   63.481251][    T7]  ext4_ext_map_blocks+0x201b/0x33e0
[   63.486651][    T7]  ? ext4_ext_release+0x10/0x10
[   63.491549][    T7]  ? down_write_killable+0x170/0x170
[   63.496847][    T7]  ? ext4_es_lookup_extent+0x41d/0xd10
[   63.502359][    T7]  ext4_map_blocks+0x4cb/0x1640
[   63.507235][    T7]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   63.512459][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   63.518032][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   63.524116][    T7]  ? ext4_alloc_io_end_vec+0x145/0x1c0
[   63.529602][    T7]  ext4_writepages+0x1a7b/0x33c0
[   63.534628][    T7]  ? __ext4_mark_inode_dirty+0x940/0x940
[   63.540279][    T7]  ? __lock_acquire+0x2224/0x48b0
[   63.545343][    T7]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   63.551347][    T7]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   63.557353][    T7]  ? __ext4_mark_inode_dirty+0x940/0x940
[   63.563009][    T7]  ? do_writepages+0xfa/0x2a0
[   63.567699][    T7]  do_writepages+0xfa/0x2a0
[   63.572220][    T7]  ? page_writeback_cpu_online+0x10/0x10
[   63.579098][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   63.584655][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   63.590647][    T7]  ? lock_downgrade+0x840/0x840
[   63.595691][    T7]  __writeback_single_inode+0x12a/0x13d0
[   63.601342][    T7]  ? _raw_spin_unlock+0x24/0x40
[   63.606245][    T7]  ? wbc_attach_and_unlock_inode+0x60a/0x9c0
[   63.612514][    T7]  writeback_sb_inodes+0x515/0xdc0
[   63.617707][    T7]  ? __writeback_single_inode+0x13d0/0x13d0
[   63.623641][    T7]  __writeback_inodes_wb+0xc3/0x250
[   63.628868][    T7]  wb_writeback+0x8db/0xd50
[   63.633400][    T7]  ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0
[   63.639841][    T7]  ? cpumask_next+0x3c/0x40
[   63.644445][    T7]  ? get_nr_dirty_inodes+0xd6/0x130
[   63.649841][    T7]  wb_workfn+0x9bc/0x1090
[   63.654756][    T7]  ? inode_wait_for_writeback+0x30/0x30
[   63.660327][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   63.665892][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   63.671893][    T7]  process_one_work+0x965/0x1690
[   63.677924][    T7]  ? lock_release+0x800/0x800
[   63.682611][    T7]  ? pwq_dec_nr_in_flight+0x310/0x310
[   63.688174][    T7]  ? rwlock_bug.part.0+0x90/0x90
[   63.691675][ T6800] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6800
[   63.693127][    T7]  worker_thread+0x96/0xe10
[   63.702546][ T6800] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   63.707149][    T7]  ? process_one_work+0x1690/0x1690
[   63.707166][    T7]  kthread+0x3b5/0x4a0
[   63.707181][    T7]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   63.707196][    T7]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   63.707216][    T7]  ret_from_fork+0x1f/0x30
[   63.739615][ T6800] CPU: 1 PID: 6800 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0
[   63.747880][ T6800] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   63.758077][ T6800] Call Trace:
[   63.761401][ T6800]  dump_stack+0x18f/0x20d
[   63.765759][ T6800]  check_preemption_disabled+0x20d/0x220
[   63.771413][ T6800]  ext4_mb_new_blocks+0xa4d/0x3b70
[   63.776574][ T6800]  ? ext4_ext_search_right+0x2ca/0xb20
[   63.782051][ T6800]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   63.782349][    T7] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:0/7
[   63.787786][ T6800]  ext4_ext_map_blocks+0x201b/0x33e0
[   63.787811][ T6800]  ? ext4_ext_release+0x10/0x10
[   63.787845][ T6800]  ? down_write_killable+0x170/0x170
[   63.796785][    T7] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   63.802036][ T6800]  ? ext4_es_lookup_extent+0x41d/0xd10
[   63.823435][ T6800]  ext4_map_blocks+0x4cb/0x1640
[   63.828297][ T6800]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   63.833482][ T6800]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   63.839018][ T6800]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   63.844983][ T6800]  ? prandom_u32_state+0xe/0x170
[   63.849928][ T6800]  ? __brelse+0x84/0xa0
[   63.854081][ T6800]  ? __ext4_new_inode+0x144/0x55e0
[   63.859179][ T6800]  ext4_getblk+0xad/0x520
[   63.863587][ T6800]  ? ext4_iomap_overwrite_begin+0xa0/0xa0
[   63.869304][ T6800]  ? ext4_free_inode+0x1700/0x1700
[   63.874419][ T6800]  ext4_bread+0x7c/0x380
[   63.878648][ T6800]  ? ext4_getblk+0x520/0x520
[   63.883235][ T6800]  ? dquot_get_next_dqblk+0x180/0x180
[   63.889303][ T6800]  ext4_append+0x153/0x360
[   63.893712][ T6800]  ext4_mkdir+0x5e0/0xdf0
[   63.898047][ T6800]  ? ext4_rmdir+0xde0/0xde0
[   63.902544][ T6800]  ? security_inode_permission+0xc4/0xf0
[   63.908190][ T6800]  vfs_mkdir+0x419/0x690
[   63.912434][ T6800]  do_mkdirat+0x21e/0x280
[   63.916765][ T6800]  ? __ia32_sys_mknod+0xb0/0xb0
[   63.921605][ T6800]  ? do_syscall_64+0x1c/0xe0
[   63.926192][ T6800]  ? lockdep_hardirqs_on_prepare+0x3a2/0x590
[   63.932166][ T6800]  do_syscall_64+0x60/0xe0
[   63.936580][ T6800]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   63.942471][ T6800] RIP: 0033:0x4b02a0
[   63.946369][ T6800] Code: Bad RIP value.
[   63.950514][ T6800] RSP: 002b:000000c0000e34b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102
[   63.958909][ T6800] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0
[   63.966878][ T6800] RDX: 00000000000001c0 RSI: 000000c00009e6c0 RDI: ffffffffffffff9c
[   63.974950][ T6800] RBP: 000000c0000e3510 R08: 0000000000000000 R09: 0000000000000000
[   63.982937][ T6800] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff
[   63.990899][ T6800] R13: 0000000000000037 R14: 0000000000000036 R15: 0000000000000100
[   63.998883][    T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0
[   64.007059][    T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.017137][    T7] Workqueue: writeback wb_workfn (flush-8:0)
[   64.023127][    T7] Call Trace:
[   64.026431][    T7]  dump_stack+0x18f/0x20d
[   64.030781][    T7]  check_preemption_disabled+0x20d/0x220
[   64.036431][    T7]  ext4_mb_new_blocks+0xa4d/0x3b70
[   64.039168][ T6817] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6817
[   64.041552][    T7]  ? ext4_find_extent+0x81a/0xad0
[   64.051096][ T6817] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   64.056048][    T7]  ? ext4_ext_search_right+0x2ca/0xb20
[   64.056064][    T7]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   64.056090][    T7]  ext4_ext_map_blocks+0x201b/0x33e0
[   64.056119][    T7]  ? ext4_ext_release+0x10/0x10
[   64.056155][    T7]  ? down_write_killable+0x170/0x170
[   64.088538][    T7]  ? ext4_es_lookup_extent+0x41d/0xd10
[   64.094000][    T7]  ext4_map_blocks+0x4cb/0x1640
[   64.098845][    T7]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   64.104034][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.109565][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.115527][    T7]  ? ext4_alloc_io_end_vec+0x145/0x1c0
[   64.120973][    T7]  ext4_writepages+0x1a7b/0x33c0
[   64.125922][    T7]  ? __ext4_mark_inode_dirty+0x940/0x940
[   64.131539][    T7]  ? __lock_acquire+0x2224/0x48b0
[   64.136562][    T7]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   64.142557][    T7]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   64.148527][    T7]  ? __ext4_mark_inode_dirty+0x940/0x940
[   64.154143][    T7]  ? do_writepages+0xfa/0x2a0
[   64.158815][    T7]  do_writepages+0xfa/0x2a0
[   64.163658][    T7]  ? page_writeback_cpu_online+0x10/0x10
[   64.169283][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.174828][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.180790][    T7]  ? lock_downgrade+0x840/0x840
[   64.185821][    T7]  __writeback_single_inode+0x12a/0x13d0
[   64.192135][    T7]  ? _raw_spin_unlock+0x24/0x40
[   64.196970][    T7]  ? wbc_attach_and_unlock_inode+0x60a/0x9c0
[   64.203295][    T7]  writeback_sb_inodes+0x515/0xdc0
[   64.208401][    T7]  ? __writeback_single_inode+0x13d0/0x13d0
[   64.214307][    T7]  __writeback_inodes_wb+0xc3/0x250
[   64.219674][    T7]  wb_writeback+0x8db/0xd50
[   64.224176][    T7]  ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0
[   64.230589][    T7]  ? cpumask_next+0x3c/0x40
[   64.235087][    T7]  ? get_nr_dirty_inodes+0xd6/0x130
[   64.240309][    T7]  wb_workfn+0x9bc/0x1090
[   64.244647][    T7]  ? inode_wait_for_writeback+0x30/0x30
[   64.250190][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.255723][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.261693][    T7]  process_one_work+0x965/0x1690
[   64.266726][    T7]  ? lock_release+0x800/0x800
[   64.271569][    T7]  ? pwq_dec_nr_in_flight+0x310/0x310
[   64.277019][    T7]  ? rwlock_bug.part.0+0x90/0x90
[   64.281949][    T7]  worker_thread+0x96/0xe10
[   64.286970][    T7]  ? process_one_work+0x1690/0x1690
[   64.292418][    T7]  kthread+0x3b5/0x4a0
[   64.296473][    T7]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   64.302266][    T7]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   64.307973][    T7]  ret_from_fork+0x1f/0x30
[   64.312418][ T6817] CPU: 1 PID: 6817 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0
[   64.321536][ T6817] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.332031][ T6817] Call Trace:
[   64.335595][ T6817]  dump_stack+0x18f/0x20d
[   64.339955][ T6817]  check_preemption_disabled+0x20d/0x220
[   64.345600][ T6817]  ext4_mb_new_blocks+0xa4d/0x3b70
[   64.350735][ T6817]  ? ext4_ext_search_right+0x2ca/0xb20
[   64.356291][ T6817]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   64.362028][ T6817]  ext4_ext_map_blocks+0x201b/0x33e0
[   64.366398][    T7] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:0/7
[   64.367361][ T6817]  ? ext4_ext_release+0x10/0x10
[   64.376999][    T7] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   64.382752][ T6817]  ? down_write_killable+0x170/0x170
[   64.394025][ T6817]  ? ext4_es_lookup_extent+0x41d/0xd10
[   64.399498][ T6817]  ext4_map_blocks+0x4cb/0x1640
[   64.404363][ T6817]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   64.410595][ T6817]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.416138][ T6817]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.422101][ T6817]  ? prandom_u32_state+0xe/0x170
[   64.427198][ T6817]  ? __brelse+0x84/0xa0
[   64.431338][ T6817]  ? __ext4_new_inode+0x144/0x55e0
[   64.436979][ T6817]  ext4_getblk+0xad/0x520
[   64.441299][ T6817]  ? ext4_iomap_overwrite_begin+0xa0/0xa0
[   64.447009][ T6817]  ? ext4_free_inode+0x1700/0x1700
[   64.452286][ T6817]  ext4_bread+0x7c/0x380
[   64.456516][ T6817]  ? ext4_getblk+0x520/0x520
[   64.462351][ T6817]  ? dquot_get_next_dqblk+0x180/0x180
[   64.467721][ T6817]  ext4_append+0x153/0x360
[   64.472156][ T6817]  ext4_mkdir+0x5e0/0xdf0
[   64.476478][ T6817]  ? ext4_rmdir+0xde0/0xde0
[   64.481002][ T6817]  ? security_inode_permission+0xc4/0xf0
[   64.486927][ T6817]  vfs_mkdir+0x419/0x690
[   64.491159][ T6817]  do_mkdirat+0x21e/0x280
[   64.495493][ T6817]  ? __ia32_sys_mknod+0xb0/0xb0
[   64.500352][ T6817]  ? do_syscall_64+0x1c/0xe0
[   64.504945][ T6817]  ? lockdep_hardirqs_on_prepare+0x3a2/0x590
[   64.510914][ T6817]  do_syscall_64+0x60/0xe0
[   64.515322][ T6817]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   64.521223][ T6817] RIP: 0033:0x45bed7
[   64.525098][ T6817] Code: Bad RIP value.
[   64.529144][ T6817] RSP: 002b:00007ffe4ea260b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
[   64.537903][ T6817] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7
[   64.545871][ T6817] RDX: 0000000000000003 RSI: 00000000000001c0 RDI: 00007ffe4ea26290
[   64.553919][ T6817] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000003880
[   64.561884][ T6817] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2
[   64.570041][ T6817] R13: 00007ffe4ea26290 R14: 8421084210842109 R15: 00007ffe4ea2629c
[   64.578108][    T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0
[   64.586272][    T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.596382][    T7] Workqueue: writeback wb_workfn (flush-8:0)
[   64.602375][    T7] Call Trace:
[   64.605678][    T7]  dump_stack+0x18f/0x20d
[   64.610026][    T7]  check_preemption_disabled+0x20d/0x220
[   64.615680][    T7]  ext4_mb_new_blocks+0xa4d/0x3b70
[   64.620803][    T7]  ? ext4_find_extent+0x81a/0xad0
[   64.625855][    T7]  ? ext4_ext_search_right+0x2ca/0xb20
[   64.631334][    T7]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   64.637427][    T7]  ext4_ext_map_blocks+0x201b/0x33e0
[   64.642737][    T7]  ? ext4_ext_release+0x10/0x10
[   64.647624][    T7]  ? down_write_killable+0x170/0x170
[   64.652945][    T7]  ? ext4_es_lookup_extent+0x41d/0xd10
[   64.658452][    T7]  ext4_map_blocks+0x4cb/0x1640
[   64.663673][    T7]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   64.668893][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.674456][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.680452][    T7]  ? ext4_alloc_io_end_vec+0x145/0x1c0
[   64.687013][ T6818] IPVS: ftp: loaded support on port[0] = 21
[   64.687314][    T7]  ext4_writepages+0x1a7b/0x33c0
[   64.698415][    T7]  ? __ext4_mark_inode_dirty+0x940/0x940
[   64.704063][    T7]  ? __lock_acquire+0x2224/0x48b0
[   64.709206][    T7]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   64.715209][    T7]  ? lockdep_hardirqs_on_prepare+0x590/0x590
[   64.721209][    T7]  ? __ext4_mark_inode_dirty+0x940/0x940
[   64.726859][    T7]  ? do_writepages+0xfa/0x2a0
[   64.731553][    T7]  do_writepages+0xfa/0x2a0
[   64.734048][ T6818] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6818
[   64.736102][    T7]  ? page_writeback_cpu_online+0x10/0x10
[   64.736125][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.736142][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.736157][    T7]  ? lock_downgrade+0x840/0x840
[   64.736179][    T7]  __writeback_single_inode+0x12a/0x13d0
[   64.736198][    T7]  ? _raw_spin_unlock+0x24/0x40
[   64.736218][    T7]  ? wbc_attach_and_unlock_inode+0x60a/0x9c0
[   64.745618][ T6818] caller is ext4_mb_new_blocks+0xa4d/0x3b70
[   64.751367][    T7]  writeback_sb_inodes+0x515/0xdc0
[   64.795908][    T7]  ? __writeback_single_inode+0x13d0/0x13d0
[   64.801811][    T7]  __writeback_inodes_wb+0xc3/0x250
[   64.807193][    T7]  wb_writeback+0x8db/0xd50
[   64.811694][    T7]  ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0
[   64.818038][    T7]  ? cpumask_next+0x3c/0x40
[   64.822533][    T7]  ? get_nr_dirty_inodes+0xd6/0x130
[   64.827727][    T7]  wb_workfn+0x9bc/0x1090
[   64.832052][    T7]  ? inode_wait_for_writeback+0x30/0x30
[   64.837615][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.843148][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.849121][    T7]  process_one_work+0x965/0x1690
[   64.854054][    T7]  ? lock_release+0x800/0x800
[   64.858736][    T7]  ? pwq_dec_nr_in_flight+0x310/0x310
[   64.864121][    T7]  ? rwlock_bug.part.0+0x90/0x90
[   64.869063][    T7]  worker_thread+0x96/0xe10
[   64.873564][    T7]  ? process_one_work+0x1690/0x1690
[   64.878752][    T7]  kthread+0x3b5/0x4a0
[   64.882824][    T7]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   64.888546][    T7]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   64.894290][    T7]  ret_from_fork+0x1f/0x30
[   64.898728][ T6818] CPU: 1 PID: 6818 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0
[   64.907438][ T6818] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.917671][ T6818] Call Trace:
[   64.921097][ T6818]  dump_stack+0x18f/0x20d
[   64.925625][ T6818]  check_preemption_disabled+0x20d/0x220
[   64.931280][ T6818]  ext4_mb_new_blocks+0xa4d/0x3b70
[   64.936448][ T6818]  ? ext4_ext_search_right+0x2ca/0xb20
[   64.941926][ T6818]  ? ext4_inode_to_goal_block+0x2df/0x3f0
[   64.947680][ T6818]  ext4_ext_map_blocks+0x201b/0x33e0
[   64.953123][ T6818]  ? ext4_ext_release+0x10/0x10
[   64.957986][ T6818]  ? down_write_killable+0x170/0x170
[   64.963274][ T6818]  ? ext4_es_lookup_extent+0x41d/0xd10
[   64.968829][ T6818]  ext4_map_blocks+0x4cb/0x1640
[   64.973689][ T6818]  ? ext4_issue_zeroout+0x1e0/0x1e0
[   64.978883][ T6818]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   64.984563][ T6818]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.990533][ T6818]  ? prandom_u32_state+0xe/0x170
[   64.995596][ T6818]  ? __brelse+0x84/0xa0
[   64.999750][ T6818]  ? __ext4_new_inode+0x144/0x55e0
[   65.005027][ T6818]  ext4_getblk+0xad/0x520
[   65.009367][ T6818]  ? ext4_iomap_overwrite_begin+0xa0/0xa0
[   65.015223][ T6818]  ? ext4_free_inode+0x1700/0x1700
[   65.020428][ T6818]  ext4_bread+0x7c/0x380
[   65.024656][ T6818]  ? ext4_getblk+0x520/0x520
[   65.029234][ T6818]  ? dquot_get_next_dqblk+0x180/0x180
[   65.034963][ T6818]  ext4_append+0x153/0x360
[   65.039367][ T6818]  ext4_mkdir+0x5e0/0xdf0
[   65.043693][ T6818]  ? ext4_rmdir+0xde0/0xde0
[   65.048268][ T6818]  ? security_inode_permission+0xc4/0xf0
[   65.053883][ T6818]  vfs_mkdir+0x419/0x690
[   65.058150][ T6818]  do_mkdirat+0x21e/0x280
[   65.062468][ T6818]  ? __ia32_sys_mknod+0xb0/0xb0
[   65.067302][ T6818]  ? do_syscall_64+0x1c/0xe0
[   65.071886][ T6818]  ? lockdep_hardirqs_on_prepare+0x3a2/0x590
[   65.077933][ T6818]  do_syscall_64+0x60/0xe0
[   65.082334][ T6818]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   65.088214][ T6818] RIP: 0033:0x45bed7
[   65.092108][ T6818] Code: Bad RIP value.
[   65.096164][ T6818] RSP: 002b:0000000000c9ffa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
[   65.104595][ T6818] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bed7
[   65.112548][ T6818] RDX: 0000000000000006 RSI: 00000000000001ff RDI: 00000000004c26c2
[   65.120612][ T6818] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000006
[   65.128563][ T6818] R10: 0000000000000064 R11: 0000000000000246 R12: 00000000004185c0
[   65.136529][ T6818] R13: 00007ffe4ea26418 R14: 0000000000000000 R15: 0000000000000000
2020/06/15 17:38:12 building call list...
[   65.434313][  T635] tipc: TX() has been purged, node left!
[   65.966534][  T635] ==================================================================
[   65.974798][  T635] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770
[   65.982683][  T635] Write of size 1 at addr ffff8880949af9e4 by task kworker/u4:5/635
[   65.990657][  T635] 
[   65.992988][  T635] CPU: 1 PID: 635 Comm: kworker/u4:5 Not tainted 5.8.0-rc1-syzkaller #0
[   66.001301][  T635] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.011355][  T635] Workqueue: netns cleanup_net
[   66.016139][  T635] Call Trace:
[   66.019431][  T635]  dump_stack+0x18f/0x20d
[   66.023762][  T635]  ? afs_wake_up_async_call+0x6aa/0x770
[   66.029303][  T635]  ? afs_wake_up_async_call+0x6aa/0x770
[   66.034840][  T635]  ? afs_put_call+0xa40/0xa40
[   66.039517][  T635]  print_address_description.constprop.0.cold+0xd3/0x413
[   66.046543][  T635]  ? vprintk_func+0x97/0x1a6
[   66.051133][  T635]  ? afs_wake_up_async_call+0x6aa/0x770
[   66.056698][  T635]  kasan_report.cold+0x1f/0x37
[   66.061464][  T635]  ? rcu_read_lock_held_common+0x51/0xa0
[   66.067090][  T635]  ? afs_wake_up_async_call+0x6aa/0x770
[   66.072644][  T635]  afs_wake_up_async_call+0x6aa/0x770
[   66.078097][  T635]  ? afs_close_socket+0x320/0x320
[   66.083122][  T635]  ? afs_put_call+0xa40/0xa40
[   66.087794][  T635]  rxrpc_notify_socket+0x1db/0x5d0
[   66.092905][  T635]  ? afs_put_call+0xa40/0xa40
[   66.097585][  T635]  __rxrpc_set_call_completion.part.0+0x172/0x410
[   66.103998][  T635]  rxrpc_call_completed+0xca/0xf0
[   66.109029][  T635]  rxrpc_discard_prealloc+0x781/0xab0
[   66.114429][  T635]  ? lock_sock_nested+0x94/0x110
[   66.121452][  T635]  rxrpc_listen+0x147/0x360
[   66.125956][  T635]  afs_close_socket+0x95/0x320
[   66.131285][  T635]  ? afs_purge_servers+0x16d/0x300
[   66.136421][  T635]  ? afs_rx_discard_new_call+0x50/0x50
[   66.141882][  T635]  ? init_wait_var_entry+0x200/0x200
[   66.147170][  T635]  ? rcu_read_lock_held_common+0xa0/0xa0
[   66.153774][  T635]  ? check_preemption_disabled+0x38/0x220
[   66.159517][  T635]  afs_net_exit+0x1bc/0x310
[   66.164018][  T635]  ? afs_net_init+0xe30/0xe30
[   66.168691][  T635]  ops_exit_list.isra.0+0xa8/0x150
[   66.173802][  T635]  cleanup_net+0x511/0xa50
[   66.178228][  T635]  ? unregister_pernet_device+0x70/0x70
[   66.185351][  T635]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   66.191340][  T635]  process_one_work+0x965/0x1690
[   66.196289][  T635]  ? lock_release+0x800/0x800
[   66.202444][  T635]  ? pwq_dec_nr_in_flight+0x310/0x310
[   66.208086][  T635]  ? rwlock_bug.part.0+0x90/0x90
[   66.213120][  T635]  worker_thread+0x96/0xe10
[   66.217668][  T635]  ? process_one_work+0x1690/0x1690
[   66.222873][  T635]  kthread+0x3b5/0x4a0
[   66.226982][  T635]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   66.232717][  T635]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   66.238450][  T635]  ret_from_fork+0x1f/0x30
[   66.242901][  T635] 
[   66.245238][  T635] Allocated by task 6818:
[   66.249566][  T635]  save_stack+0x1b/0x40
[   66.253718][  T635]  __kasan_kmalloc.constprop.0+0xbf/0xd0
[   66.259457][  T635]  kmem_cache_alloc_trace+0x153/0x7d0
[   66.265045][  T635]  afs_alloc_call+0x55/0x630
[   66.269744][  T635]  afs_charge_preallocation+0xe9/0x2d0
[   66.275201][  T635]  afs_open_socket+0x292/0x360
[   66.279977][  T635]  afs_net_init+0xa6c/0xe30
[   66.284486][  T635]  ops_init+0xaf/0x420
[   66.288551][  T635]  setup_net+0x2de/0x860
[   66.292797][  T635]  copy_net_ns+0x293/0x590
[   66.297645][  T635]  create_new_namespaces+0x3fb/0xb30
[   66.302926][  T635]  unshare_nsproxy_namespaces+0xbd/0x1f0
[   66.308564][  T635]  ksys_unshare+0x43d/0x8e0
[   66.313064][  T635]  __x64_sys_unshare+0x2d/0x40
[   66.317822][  T635]  do_syscall_64+0x60/0xe0
[   66.322325][  T635]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   66.328310][  T635] 
[   66.330911][  T635] Freed by task 635:
[   66.334805][  T635]  save_stack+0x1b/0x40
[   66.338995][  T635]  __kasan_slab_free+0xf7/0x140
[   66.343849][  T635]  kfree+0x109/0x2b0
[   66.347746][  T635]  afs_put_call+0x585/0xa40
[   66.352262][  T635]  rxrpc_discard_prealloc+0x764/0xab0
[   66.357638][  T635]  rxrpc_listen+0x147/0x360
[   66.362141][  T635]  afs_close_socket+0x95/0x320
[   66.366901][  T635]  afs_net_exit+0x1bc/0x310
[   66.371397][  T635]  ops_exit_list.isra.0+0xa8/0x150
[   66.376503][  T635]  cleanup_net+0x511/0xa50
[   66.380918][  T635]  process_one_work+0x965/0x1690
[   66.386061][  T635]  worker_thread+0x96/0xe10
[   66.390602][  T635]  kthread+0x3b5/0x4a0
[   66.394699][  T635]  ret_from_fork+0x1f/0x30
[   66.399143][  T635] 
[   66.401489][  T635] The buggy address belongs to the object at ffff8880949af800
[   66.401489][  T635]  which belongs to the cache kmalloc-1k of size 1024
[   66.415653][  T635] The buggy address is located 484 bytes inside of
[   66.415653][  T635]  1024-byte region [ffff8880949af800, ffff8880949afc00)
[   66.429611][  T635] The buggy address belongs to the page:
[   66.435246][  T635] page:ffffea0002526bc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880949af000
[   66.445736][  T635] flags: 0xfffe0000000200(slab)
[   66.450587][  T635] raw: 00fffe0000000200 ffffea0002a39808 ffffea0002478308 ffff8880aa000c40
[   66.460388][  T635] raw: ffff8880949af000 ffff8880949af000 0000000100000001 0000000000000000
[   66.468962][  T635] page dumped because: kasan: bad access detected
[   66.475364][  T635] 
[   66.477772][  T635] Memory state around the buggy address:
[   66.483401][  T635]  ffff8880949af880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   66.491477][  T635]  ffff8880949af900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   66.499559][  T635] >ffff8880949af980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   66.507629][  T635]                                                        ^
[   66.514820][  T635]  ffff8880949afa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   66.522885][  T635]  ffff8880949afa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   66.530937][  T635] ==================================================================
[   66.538990][  T635] Disabling lock debugging due to kernel taint
[   66.545209][  T635] Kernel panic - not syncing: panic_on_warn set ...
[   66.551796][  T635] CPU: 1 PID: 635 Comm: kworker/u4:5 Tainted: G    B             5.8.0-rc1-syzkaller #0
[   66.561596][  T635] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.572034][  T635] Workqueue: netns cleanup_net
[   66.576800][  T635] Call Trace:
[   66.582878][  T635]  dump_stack+0x18f/0x20d
[   66.587396][  T635]  ? afs_wake_up_async_call+0x670/0x770
[   66.593119][  T635]  ? afs_put_call+0xa40/0xa40
[   66.597805][  T635]  panic+0x2e3/0x75c
[   66.601710][  T635]  ? __warn_printk+0xf3/0xf3
[   66.606312][  T635]  ? asm_sysvec_apic_timer_interrupt+0x12/0x20
[   66.612463][  T635]  ? trace_hardirqs_on+0x55/0x220
[   66.617630][  T635]  ? afs_wake_up_async_call+0x6aa/0x770
[   66.623669][  T635]  ? afs_wake_up_async_call+0x6aa/0x770
[   66.629203][  T635]  ? afs_put_call+0xa40/0xa40
[   66.633883][  T635]  end_report+0x4d/0x53
[   66.638427][  T635]  kasan_report.cold+0xd/0x37
[   66.643377][  T635]  ? rcu_read_lock_held_common+0x51/0xa0
[   66.648998][  T635]  ? afs_wake_up_async_call+0x6aa/0x770
[   66.654532][  T635]  afs_wake_up_async_call+0x6aa/0x770
[   66.659946][  T635]  ? afs_close_socket+0x320/0x320
[   66.664971][  T635]  ? afs_put_call+0xa40/0xa40
[   66.669656][  T635]  rxrpc_notify_socket+0x1db/0x5d0
[   66.675020][  T635]  ? afs_put_call+0xa40/0xa40
[   66.679689][  T635]  __rxrpc_set_call_completion.part.0+0x172/0x410
[   66.686178][  T635]  rxrpc_call_completed+0xca/0xf0
[   66.691192][  T635]  rxrpc_discard_prealloc+0x781/0xab0
[   66.696569][  T635]  ? lock_sock_nested+0x94/0x110
[   66.701648][  T635]  rxrpc_listen+0x147/0x360
[   66.706151][  T635]  afs_close_socket+0x95/0x320
[   66.710918][  T635]  ? afs_purge_servers+0x16d/0x300
[   66.716026][  T635]  ? afs_rx_discard_new_call+0x50/0x50
[   66.721473][  T635]  ? init_wait_var_entry+0x200/0x200
[   66.727283][  T635]  ? rcu_read_lock_held_common+0xa0/0xa0
[   66.732907][  T635]  ? check_preemption_disabled+0x38/0x220
[   66.738634][  T635]  afs_net_exit+0x1bc/0x310
[   66.743128][  T635]  ? afs_net_init+0xe30/0xe30
[   66.747816][  T635]  ops_exit_list.isra.0+0xa8/0x150
[   66.752918][  T635]  cleanup_net+0x511/0xa50
[   66.757536][  T635]  ? unregister_pernet_device+0x70/0x70
[   66.763102][  T635]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   66.769097][  T635]  process_one_work+0x965/0x1690
[   66.774021][  T635]  ? lock_release+0x800/0x800
[   66.778815][  T635]  ? pwq_dec_nr_in_flight+0x310/0x310
[   66.784191][  T635]  ? rwlock_bug.part.0+0x90/0x90
[   66.789262][  T635]  worker_thread+0x96/0xe10
[   66.793823][  T635]  ? process_one_work+0x1690/0x1690
[   66.799023][  T635]  kthread+0x3b5/0x4a0
[   66.803102][  T635]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   66.808822][  T635]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   66.814727][  T635]  ret_from_fork+0x1f/0x30
[   66.819846][  T635] Kernel Offset: disabled
[   66.824168][  T635] Rebooting in 86400 seconds..