Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 62.199943][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 62.209240][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.215570][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.223990][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.234046][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 62.240016][ T6746] Call Trace: [ 62.243288][ T6746] dump_stack+0x18f/0x20d [ 62.247617][ T6746] check_preemption_disabled+0x20d/0x220 [ 62.253230][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.258323][ T6746] ? ext4_find_extent+0x81a/0xad0 [ 62.263344][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 62.268805][ T6746] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 62.274510][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 62.279792][ T6746] ? ext4_ext_release+0x10/0x10 [ 62.284631][ T6746] ? down_write_killable+0x170/0x170 [ 62.289894][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 62.295345][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 62.300203][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 62.305387][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.310924][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.316893][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 62.322344][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 62.327296][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 62.332907][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 62.337917][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.343887][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.349845][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.355827][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 62.361451][ T6746] ? do_writepages+0xfa/0x2a0 [ 62.366119][ T6746] do_writepages+0xfa/0x2a0 [ 62.370615][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 62.376327][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.381865][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.387821][ T6746] ? lock_downgrade+0x840/0x840 [ 62.392653][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 62.398295][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 62.403136][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 62.409115][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 62.414214][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 62.420111][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 62.425293][ T6746] wb_writeback+0x8db/0xd50 [ 62.429793][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 62.436104][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 62.441980][ T6746] ? cpumask_next+0x3c/0x40 [ 62.446462][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 62.451643][ T6746] wb_workfn+0xab3/0x1090 [ 62.455956][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 62.461484][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.467018][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.472980][ T6746] process_one_work+0x965/0x1690 [ 62.477900][ T6746] ? lock_release+0x800/0x800 [ 62.482557][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.487908][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 62.492840][ T6746] worker_thread+0x96/0xe10 [ 62.497329][ T6746] ? process_one_work+0x1690/0x1690 [ 62.502508][ T6746] kthread+0x3b5/0x4a0 [ 62.506566][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.512268][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.517991][ T6746] ret_from_fork+0x1f/0x30 [ 62.524399][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 62.533726][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.539739][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.548147][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.558195][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 62.564150][ T6746] Call Trace: [ 62.567424][ T6746] dump_stack+0x18f/0x20d [ 62.571738][ T6746] check_preemption_disabled+0x20d/0x220 [ 62.577411][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.582547][ T6746] ? ext4_find_extent+0x81a/0xad0 [ 62.587556][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 62.593014][ T6746] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 62.598729][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 62.604013][ T6746] ? ext4_ext_release+0x10/0x10 [ 62.608892][ T6746] ? down_write_killable+0x170/0x170 [ 62.614166][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 62.619626][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 62.624549][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 62.629730][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.635253][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.641299][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 62.646747][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 62.651686][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 62.657296][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 62.662319][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.668296][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.674272][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 62.679910][ T6746] ? do_writepages+0xfa/0x2a0 [ 62.684629][ T6746] do_writepages+0xfa/0x2a0 [ 62.689234][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 62.694878][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.700411][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.706368][ T6746] ? lock_downgrade+0x840/0x840 [ 62.711205][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 62.716819][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 62.721662][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 62.727712][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 62.732849][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 62.738743][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 62.743939][ T6746] wb_writeback+0x8db/0xd50 [ 62.748440][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 62.754805][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 62.760729][ T6746] ? cpumask_next+0x3c/0x40 [ 62.765260][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 62.770484][ T6746] wb_workfn+0xab3/0x1090 [ 62.774838][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 62.780366][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.785909][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.791886][ T6746] process_one_work+0x965/0x1690 [ 62.796808][ T6746] ? lock_release+0x800/0x800 [ 62.801463][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.806815][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 62.811754][ T6746] worker_thread+0x96/0xe10 [ 62.816271][ T6746] ? process_one_work+0x1690/0x1690 [ 62.821462][ T6746] kthread+0x3b5/0x4a0 [ 62.825516][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.831317][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.837036][ T6746] ret_from_fork+0x1f/0x30 [ 62.849935][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 62.859184][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.865234][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.873653][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.883729][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 62.889716][ T6746] Call Trace: [ 62.893019][ T6746] dump_stack+0x18f/0x20d [ 62.897370][ T6746] check_preemption_disabled+0x20d/0x220 [ 62.903297][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.908426][ T6746] ? ext4_find_extent+0x81a/0xad0 [ 62.913473][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 62.918944][ T6746] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 62.924685][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 62.929996][ T6746] ? ext4_ext_release+0x10/0x10 [ 62.934878][ T6746] ? down_write_killable+0x170/0x170 [ 62.940184][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 62.945666][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 62.950526][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 62.955715][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.961504][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.967467][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 62.972911][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 62.977852][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 62.984076][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 62.989094][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.995058][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.001020][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 63.006631][ T6746] ? do_writepages+0xfa/0x2a0 [ 63.011289][ T6746] do_writepages+0xfa/0x2a0 [ 63.015786][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 63.021429][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.026977][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.032937][ T6746] ? lock_downgrade+0x840/0x840 [ 63.037787][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 63.043421][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 63.048268][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 63.054355][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 63.059456][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 63.065364][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 63.070552][ T6746] wb_writeback+0x8db/0xd50 [ 63.075042][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 63.081366][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 63.087243][ T6746] ? cpumask_next+0x3c/0x40 [ 63.091741][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 63.096922][ T6746] wb_workfn+0xab3/0x1090 [ 63.101240][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 63.106784][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.112326][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.118316][ T6746] process_one_work+0x965/0x1690 [ 63.123256][ T6746] ? lock_release+0x800/0x800 [ 63.127914][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.133282][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 63.138223][ T6746] worker_thread+0x96/0xe10 [ 63.142715][ T6746] ? process_one_work+0x1690/0x1690 [ 63.147915][ T6746] kthread+0x3b5/0x4a0 [ 63.151964][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.157667][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.163375][ T6746] ret_from_fork+0x1f/0x30 [ 63.170719][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 63.180508][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.186422][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 63.194914][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.204971][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 63.210941][ T6746] Call Trace: [ 63.214657][ T6746] dump_stack+0x18f/0x20d [ 63.218975][ T6746] check_preemption_disabled+0x20d/0x220 [ 63.224590][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.229687][ T6746] ? ext4_find_extent+0x81a/0xad0 [ 63.234714][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 63.240165][ T6746] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 63.245887][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 63.251172][ T6746] ? ext4_ext_release+0x10/0x10 [ 63.256017][ T6746] ? down_write_killable+0x170/0x170 [ 63.261285][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 63.266728][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 63.271568][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 63.276751][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.282290][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.288276][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 63.293822][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 63.298757][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 63.304370][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 63.309384][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.315347][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.321311][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 63.326924][ T6746] ? do_writepages+0xfa/0x2a0 [ 63.331588][ T6746] do_writepages+0xfa/0x2a0 [ 63.336094][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 63.341979][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.347507][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.353486][ T6746] ? lock_downgrade+0x840/0x840 [ 63.358325][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 63.363953][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 63.368792][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 63.374758][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 63.379908][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 63.385795][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 63.390980][ T6746] wb_writeback+0x8db/0xd50 [ 63.395489][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 63.401801][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 63.407675][ T6746] ? cpumask_next+0x3c/0x40 [ 63.412191][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 63.417373][ T6746] wb_workfn+0xab3/0x1090 [ 63.421696][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 63.427226][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.432780][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.438752][ T6746] process_one_work+0x965/0x1690 [ 63.443696][ T6746] ? lock_release+0x800/0x800 [ 63.448359][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.453736][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 63.458661][ T6746] worker_thread+0x96/0xe10 [ 63.463197][ T6746] ? process_one_work+0x1690/0x1690 [ 63.468397][ T6746] kthread+0x3b5/0x4a0 [ 63.472453][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.478158][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.483863][ T6746] ret_from_fork+0x1f/0x30 [ 63.490208][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 63.499651][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.505598][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 63.514015][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.524083][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 63.530043][ T6746] Call Trace: [ 63.533331][ T6746] dump_stack+0x18f/0x20d [ 63.537662][ T6746] check_preemption_disabled+0x20d/0x220 [ 63.543291][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.548390][ T6746] ? ext4_find_extent+0x81a/0xad0 [ 63.553424][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 63.561408][ T6746] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 63.567123][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 63.572660][ T6746] ? ext4_ext_release+0x10/0x10 [ 63.577507][ T6746] ? down_write_killable+0x170/0x170 [ 63.582782][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 63.588220][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 63.593056][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 63.598252][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.603776][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.609750][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 63.615198][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 63.620191][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 63.625811][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 63.630830][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.636824][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.642786][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 63.648399][ T6746] ? do_writepages+0xfa/0x2a0 [ 63.653066][ T6746] do_writepages+0xfa/0x2a0 [ 63.657564][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 63.663193][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.668747][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.674756][ T6746] ? lock_downgrade+0x840/0x840 [ 63.679610][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 63.685237][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 63.690068][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 63.696031][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 63.701134][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 63.707020][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 63.712204][ T6746] wb_writeback+0x8db/0xd50 [ 63.716703][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 63.723028][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 63.728918][ T6746] ? cpumask_next+0x3c/0x40 [ 63.733412][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 63.738603][ T6746] wb_workfn+0xab3/0x1090 [ 63.742919][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 63.748457][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.753983][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.759958][ T6746] process_one_work+0x965/0x1690 [ 63.764893][ T6746] ? lock_release+0x800/0x800 [ 63.769548][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.774910][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 63.779845][ T6746] worker_thread+0x96/0xe10 [ 63.784334][ T6746] ? process_one_work+0x1690/0x1690 [ 63.789513][ T6746] kthread+0x3b5/0x4a0 [ 63.793575][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.799283][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.804993][ T6746] ret_from_fork+0x1f/0x30 [ 63.817261][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 63.826610][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.832658][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 63.841066][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.851295][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 63.857268][ T6746] Call Trace: [ 63.860541][ T6746] dump_stack+0x18f/0x20d [ 63.864864][ T6746] check_preemption_disabled+0x20d/0x220 [ 63.870489][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.875625][ T6746] ? ext4_find_extent+0x81a/0xad0 [ 63.880652][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 63.886109][ T6746] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 63.891813][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 63.897084][ T6746] ? ext4_ext_release+0x10/0x10 [ 63.901936][ T6746] ? down_write_killable+0x170/0x170 [ 63.907196][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 63.912637][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 63.917482][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 63.922664][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.928205][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.934164][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 63.939603][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 63.944542][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 63.950155][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 63.955170][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.961138][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.967109][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 63.972721][ T6746] ? do_writepages+0xfa/0x2a0 [ 63.977376][ T6746] do_writepages+0xfa/0x2a0 [ 63.981878][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 63.987495][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.993036][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.998994][ T6746] ? lock_downgrade+0x840/0x840 [ 64.003830][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 64.009455][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 64.014283][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 64.020242][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 64.025352][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 64.031249][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 64.036455][ T6746] wb_writeback+0x8db/0xd50 [ 64.040942][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 64.047250][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 64.053127][ T6746] ? cpumask_next+0x3c/0x40 [ 64.057622][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 64.062817][ T6746] wb_workfn+0xab3/0x1090 [ 64.067145][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 64.072675][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.078210][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.084175][ T6746] process_one_work+0x965/0x1690 [ 64.089110][ T6746] ? lock_release+0x800/0x800 [ 64.093766][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.099127][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 64.104061][ T6746] worker_thread+0x96/0xe10 [ 64.108551][ T6746] ? process_one_work+0x1690/0x1690 [ 64.113830][ T6746] kthread+0x3b5/0x4a0 [ 64.117888][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.123614][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.129343][ T6746] ret_from_fork+0x1f/0x30 [ 64.166399][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 64.176176][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.182239][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.190660][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.200733][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 64.206724][ T6746] Call Trace: [ 64.210048][ T6746] dump_stack+0x18f/0x20d [ 64.214398][ T6746] check_preemption_disabled+0x20d/0x220 [ 64.220047][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.225192][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.230675][ T6746] ? ext4_ext_next_allocated_block+0x221/0x2d0 [ 64.236855][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.242165][ T6746] ? ext4_ext_release+0x10/0x10 [ 64.247034][ T6746] ? down_write_killable+0x170/0x170 [ 64.252318][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.257778][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 64.262637][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.267825][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.273358][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.279323][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 64.284769][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 64.289731][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.295357][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 64.300383][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.306354][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.311993][ T6746] ? do_writepages+0xfa/0x2a0 [ 64.316653][ T6746] do_writepages+0xfa/0x2a0 [ 64.321147][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 64.326770][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.332299][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.338262][ T6746] ? lock_downgrade+0x840/0x840 [ 64.343102][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 64.348734][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 64.353582][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 64.359550][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 64.364655][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 64.370548][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 64.375736][ T6746] wb_writeback+0x8db/0xd50 [ 64.380231][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 64.386547][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 64.392429][ T6746] ? cpumask_next+0x3c/0x40 [ 64.396918][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 64.402120][ T6746] wb_workfn+0xab3/0x1090 [ 64.406440][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 64.411977][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.417507][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.423479][ T6746] process_one_work+0x965/0x1690 [ 64.428498][ T6746] ? lock_release+0x800/0x800 [ 64.433167][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.438524][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 64.443473][ T6746] worker_thread+0x96/0xe10 [ 64.447997][ T6746] ? process_one_work+0x1690/0x1690 [ 64.453189][ T6746] kthread+0x3b5/0x4a0 [ 64.457246][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.462947][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.468656][ T6746] ret_from_fork+0x1f/0x30 Warning: Permanently added '10.128.0.168' (ECDSA) to the list of known hosts. [ 64.503353][ T6746] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6746 [ 64.513827][ T6746] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.519868][ T6746] CPU: 1 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.528553][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.538628][ T6746] Workqueue: writeback wb_workfn (flush-8:0) [ 64.544617][ T6746] Call Trace: [ 64.547936][ T6746] dump_stack+0x18f/0x20d [ 64.552290][ T6746] check_preemption_disabled+0x20d/0x220 [ 64.557949][ T6746] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.563092][ T6746] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.568572][ T6746] ? ext4_ext_next_allocated_block+0x221/0x2d0 [ 64.574745][ T6746] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.580054][ T6746] ? ext4_ext_release+0x10/0x10 [ 64.584934][ T6746] ? down_write_killable+0x170/0x170 [ 64.590230][ T6746] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.595712][ T6746] ext4_map_blocks+0x4cb/0x1640 [ 64.600619][ T6746] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.605862][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.611768][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.617765][ T6746] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 64.623240][ T6746] ext4_writepages+0x1a7b/0x33c0 [ 64.628220][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.633864][ T6746] ? __lock_acquire+0x2224/0x48b0 [ 64.638924][ T6746] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.644926][ T6746] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.650577][ T6746] ? do_writepages+0xfa/0x2a0 [ 64.655337][ T6746] do_writepages+0xfa/0x2a0 [ 64.659830][ T6746] ? page_writeback_cpu_online+0x10/0x10 [ 64.665494][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.671023][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.676982][ T6746] ? lock_downgrade+0x840/0x840 [ 64.681815][ T6746] __writeback_single_inode+0x12a/0x13d0 [ 64.687428][ T6746] ? _raw_spin_unlock+0x24/0x40 [ 64.692293][ T6746] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 64.698298][ T6746] writeback_sb_inodes+0x515/0xdc0 [ 64.703445][ T6746] ? __writeback_single_inode+0x13d0/0x13d0 [ 64.709376][ T6746] __writeback_inodes_wb+0xc3/0x250 [ 64.714594][ T6746] wb_writeback+0x8db/0xd50 [ 64.719120][ T6746] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 64.725459][ T6746] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 64.731366][ T6746] ? cpumask_next+0x3c/0x40 [ 64.735877][ T6746] ? get_nr_dirty_inodes+0xd6/0x130 [ 64.741088][ T6746] wb_workfn+0xab3/0x1090 [ 64.745428][ T6746] ? inode_wait_for_writeback+0x30/0x30 [ 64.750985][ T6746] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.756552][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.762546][ T6746] process_one_work+0x965/0x1690 [ 64.767505][ T6746] ? lock_release+0x800/0x800 [ 64.772189][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.777569][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 64.782538][ T6746] worker_thread+0x96/0xe10 [ 64.787058][ T6746] ? process_one_work+0x1690/0x1690 [ 64.792258][ T6746] kthread+0x3b5/0x4a0 [ 64.796332][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.802049][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.807776][ T6746] ret_from_fork+0x1f/0x30 2020/06/16 20:28:07 fuzzer started 2020/06/16 20:28:07 connecting to host at 10.128.0.26:34309 2020/06/16 20:28:07 checking machine... 2020/06/16 20:28:07 checking revisions... 2020/06/16 20:28:07 testing simple program... [ 65.324500][ T6797] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6797 [ 65.333657][ T6797] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.339626][ T6797] CPU: 0 PID: 6797 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 65.347950][ T6797] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.357991][ T6797] Call Trace: [ 65.361310][ T6797] dump_stack+0x18f/0x20d [ 65.365664][ T6797] check_preemption_disabled+0x20d/0x220 [ 65.371399][ T6797] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.376500][ T6797] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.381954][ T6797] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.387662][ T6797] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.392930][ T6797] ? ext4_ext_release+0x10/0x10 [ 65.397786][ T6797] ? down_write_killable+0x170/0x170 [ 65.403063][ T6797] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.408503][ T6797] ext4_map_blocks+0x4cb/0x1640 [ 65.413340][ T6797] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.418515][ T6797] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.424130][ T6797] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.430088][ T6797] ? prandom_u32_state+0xe/0x170 [ 65.435017][ T6797] ? __brelse+0x84/0xa0 [ 65.440105][ T6797] ? __ext4_new_inode+0x144/0x55e0 [ 65.445200][ T6797] ext4_getblk+0xad/0x520 [ 65.449526][ T6797] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 65.455239][ T6797] ? ext4_free_inode+0x1700/0x1700 [ 65.460345][ T6797] ext4_bread+0x7c/0x380 [ 65.464581][ T6797] ? ext4_getblk+0x520/0x520 [ 65.469162][ T6797] ? dquot_get_next_dqblk+0x180/0x180 [ 65.474535][ T6797] ext4_append+0x153/0x360 [ 65.478934][ T6797] ext4_mkdir+0x5e0/0xdf0 [ 65.483246][ T6797] ? ext4_rmdir+0xde0/0xde0 [ 65.487729][ T6797] ? security_inode_permission+0xc4/0xf0 [ 65.493362][ T6797] vfs_mkdir+0x419/0x690 [ 65.497596][ T6797] do_mkdirat+0x21e/0x280 [ 65.502291][ T6797] ? __ia32_sys_mknod+0xb0/0xb0 [ 65.507124][ T6797] ? do_syscall_64+0x1c/0xe0 [ 65.511708][ T6797] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 65.517668][ T6797] do_syscall_64+0x60/0xe0 [ 65.522114][ T6797] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.528027][ T6797] RIP: 0033:0x4b02a0 [ 65.531893][ T6797] Code: Bad RIP value. [ 65.535932][ T6797] RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 65.544332][ T6797] RAX: ffffffffffffffda RBX: 000000c00002e500 RCX: 00000000004b02a0 [ 65.552282][ T6797] RDX: 00000000000001c0 RSI: 000000c0000ce980 RDI: ffffffffffffff9c [ 65.560244][ T6797] RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000 [ 65.568208][ T6797] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 65.576158][ T6797] R13: 000000000000004d R14: 000000000000004c R15: 0000000000000100 [ 65.593834][ T6809] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6809 [ 65.603299][ T6809] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.609276][ T6809] CPU: 0 PID: 6809 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.617860][ T6809] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.627900][ T6809] Call Trace: [ 65.631186][ T6809] dump_stack+0x18f/0x20d [ 65.635511][ T6809] check_preemption_disabled+0x20d/0x220 [ 65.641126][ T6809] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.646292][ T6809] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.651761][ T6809] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.657469][ T6809] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.662754][ T6809] ? ext4_ext_release+0x10/0x10 [ 65.667594][ T6809] ? down_write_killable+0x170/0x170 [ 65.672857][ T6809] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.678316][ T6809] ext4_map_blocks+0x4cb/0x1640 [ 65.683165][ T6809] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.688343][ T6809] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.693867][ T6809] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.699838][ T6809] ? prandom_u32_state+0xe/0x170 [ 65.704844][ T6809] ? __brelse+0x84/0xa0 [ 65.708989][ T6809] ? __ext4_new_inode+0x144/0x55e0 [ 65.714100][ T6809] ext4_getblk+0xad/0x520 [ 65.718421][ T6809] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 65.724121][ T6809] ? ext4_free_inode+0x1700/0x1700 [ 65.729226][ T6809] ext4_bread+0x7c/0x380 [ 65.733448][ T6809] ? ext4_getblk+0x520/0x520 [ 65.738026][ T6809] ? dquot_get_next_dqblk+0x180/0x180 [ 65.743389][ T6809] ext4_append+0x153/0x360 [ 65.747809][ T6809] ext4_mkdir+0x5e0/0xdf0 [ 65.752120][ T6809] ? ext4_rmdir+0xde0/0xde0 [ 65.756616][ T6809] ? security_inode_permission+0xc4/0xf0 [ 65.762246][ T6809] vfs_mkdir+0x419/0x690 [ 65.766485][ T6809] do_mkdirat+0x21e/0x280 [ 65.770810][ T6809] ? __ia32_sys_mknod+0xb0/0xb0 [ 65.775640][ T6809] ? do_syscall_64+0x1c/0xe0 [ 65.780218][ T6809] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 65.786175][ T6809] do_syscall_64+0x60/0xe0 [ 65.790586][ T6809] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.796464][ T6809] RIP: 0033:0x45bed7 [ 65.800331][ T6809] Code: Bad RIP value. [ 65.804385][ T6809] RSP: 002b:00007fff0845cd38 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 65.812773][ T6809] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7 [ 65.820720][ T6809] RDX: 0000000000000002 RSI: 00000000000001c0 RDI: 00007fff0845cf10 [ 65.828667][ T6809] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000002c80 [ 65.836615][ T6809] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 65.844564][ T6809] R13: 00007fff0845cf10 R14: 8421084210842109 R15: 00007fff0845cf1c [ 65.931670][ T6810] IPVS: ftp: loaded support on port[0] = 21 2020/06/16 20:28:08 building call list... [ 66.259407][ T6746] tipc: TX() has been purged, node left! [ 66.771661][ T6746] ================================================================== [ 66.779895][ T6746] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 66.787783][ T6746] Write of size 1 at addr ffff88808e8691e4 by task kworker/u4:6/6746 [ 66.795839][ T6746] [ 66.798169][ T6746] CPU: 0 PID: 6746 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 66.806570][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.816640][ T6746] Workqueue: netns cleanup_net [ 66.821396][ T6746] Call Trace: [ 66.824707][ T6746] dump_stack+0x18f/0x20d [ 66.829038][ T6746] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.834577][ T6746] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.840118][ T6746] ? afs_put_call+0xa40/0xa40 [ 66.844795][ T6746] print_address_description.constprop.0.cold+0xd3/0x413 [ 66.851820][ T6746] ? vprintk_func+0x97/0x1a6 [ 66.856410][ T6746] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.861965][ T6746] kasan_report.cold+0x1f/0x37 [ 66.866747][ T6746] ? rcu_read_lock_held_common+0x51/0xa0 [ 66.872373][ T6746] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.877918][ T6746] afs_wake_up_async_call+0x6aa/0x770 [ 66.883285][ T6746] ? afs_close_socket+0x320/0x320 [ 66.888310][ T6746] ? afs_put_call+0xa40/0xa40 [ 66.892996][ T6746] rxrpc_notify_socket+0x1db/0x5d0 [ 66.898119][ T6746] ? afs_put_call+0xa40/0xa40 [ 66.902796][ T6746] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.909222][ T6746] rxrpc_call_completed+0xca/0xf0 [ 66.914265][ T6746] rxrpc_discard_prealloc+0x781/0xab0 [ 66.919640][ T6746] ? lock_sock_nested+0x94/0x110 [ 66.924581][ T6746] rxrpc_listen+0x147/0x360 [ 66.929088][ T6746] afs_close_socket+0x95/0x320 [ 66.933849][ T6746] ? afs_purge_servers+0x16d/0x300 [ 66.938955][ T6746] ? afs_rx_discard_new_call+0x50/0x50 [ 66.944417][ T6746] ? init_wait_var_entry+0x200/0x200 [ 66.949707][ T6746] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.955337][ T6746] ? check_preemption_disabled+0x38/0x220 [ 66.961058][ T6746] afs_net_exit+0x1bc/0x310 [ 66.965557][ T6746] ? afs_net_init+0xe30/0xe30 [ 66.970238][ T6746] ops_exit_list.isra.0+0xa8/0x150 [ 66.975356][ T6746] cleanup_net+0x511/0xa50 [ 66.979792][ T6746] ? unregister_pernet_device+0x70/0x70 [ 66.985340][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.991331][ T6746] process_one_work+0x965/0x1690 [ 66.996278][ T6746] ? lock_release+0x800/0x800 [ 67.000952][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 67.006335][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 67.011285][ T6746] worker_thread+0x96/0xe10 [ 67.015803][ T6746] ? process_one_work+0x1690/0x1690 [ 67.021002][ T6746] kthread+0x3b5/0x4a0 [ 67.025073][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.030789][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.036509][ T6746] ret_from_fork+0x1f/0x30 [ 67.040934][ T6746] [ 67.043256][ T6746] Allocated by task 6810: [ 67.047580][ T6746] save_stack+0x1b/0x40 [ 67.051736][ T6746] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 67.057361][ T6746] kmem_cache_alloc_trace+0x153/0x7d0 [ 67.062750][ T6746] afs_alloc_call+0x55/0x630 [ 67.067348][ T6746] afs_charge_preallocation+0xe9/0x2d0 [ 67.072813][ T6746] afs_open_socket+0x292/0x360 [ 67.077569][ T6746] afs_net_init+0xa6c/0xe30 [ 67.082068][ T6746] ops_init+0xaf/0x420 [ 67.086130][ T6746] setup_net+0x2de/0x860 [ 67.090364][ T6746] copy_net_ns+0x293/0x590 [ 67.094777][ T6746] create_new_namespaces+0x3fb/0xb30 [ 67.100068][ T6746] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 67.105699][ T6746] ksys_unshare+0x43d/0x8e0 [ 67.110213][ T6746] __x64_sys_unshare+0x2d/0x40 [ 67.114994][ T6746] do_syscall_64+0x60/0xe0 [ 67.119422][ T6746] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.125303][ T6746] [ 67.127621][ T6746] Freed by task 6746: [ 67.131599][ T6746] save_stack+0x1b/0x40 [ 67.135753][ T6746] __kasan_slab_free+0xf7/0x140 [ 67.140597][ T6746] kfree+0x109/0x2b0 [ 67.144485][ T6746] afs_put_call+0x585/0xa40 [ 67.148987][ T6746] rxrpc_discard_prealloc+0x764/0xab0 [ 67.154355][ T6746] rxrpc_listen+0x147/0x360 [ 67.158863][ T6746] afs_close_socket+0x95/0x320 [ 67.163620][ T6746] afs_net_exit+0x1bc/0x310 [ 67.168122][ T6746] ops_exit_list.isra.0+0xa8/0x150 [ 67.173226][ T6746] cleanup_net+0x511/0xa50 [ 67.177641][ T6746] process_one_work+0x965/0x1690 [ 67.182573][ T6746] worker_thread+0x96/0xe10 [ 67.187085][ T6746] kthread+0x3b5/0x4a0 [ 67.191164][ T6746] ret_from_fork+0x1f/0x30 [ 67.195565][ T6746] [ 67.197889][ T6746] The buggy address belongs to the object at ffff88808e869000 [ 67.197889][ T6746] which belongs to the cache kmalloc-1k of size 1024 [ 67.211952][ T6746] The buggy address is located 484 bytes inside of [ 67.211952][ T6746] 1024-byte region [ffff88808e869000, ffff88808e869400) [ 67.225312][ T6746] The buggy address belongs to the page: [ 67.230944][ T6746] page:ffffea00023a1a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 67.240043][ T6746] flags: 0xfffe0000000200(slab) [ 67.244916][ T6746] raw: 00fffe0000000200 ffffea00028ced08 ffffea000246ed88 ffff8880aa000c40 [ 67.253500][ T6746] raw: 0000000000000000 ffff88808e869000 0000000100000002 0000000000000000 [ 67.262097][ T6746] page dumped because: kasan: bad access detected [ 67.268583][ T6746] [ 67.270902][ T6746] Memory state around the buggy address: [ 67.276525][ T6746] ffff88808e869080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.284579][ T6746] ffff88808e869100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.292639][ T6746] >ffff88808e869180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.300710][ T6746] ^ [ 67.307916][ T6746] ffff88808e869200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.315983][ T6746] ffff88808e869280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.324048][ T6746] ================================================================== [ 67.332133][ T6746] Disabling lock debugging due to kernel taint [ 67.338439][ T6746] Kernel panic - not syncing: panic_on_warn set ... [ 67.345084][ T6746] CPU: 0 PID: 6746 Comm: kworker/u4:6 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 67.354878][ T6746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.364937][ T6746] Workqueue: netns cleanup_net [ 67.369691][ T6746] Call Trace: [ 67.372984][ T6746] dump_stack+0x18f/0x20d [ 67.377320][ T6746] ? afs_wake_up_async_call+0x670/0x770 [ 67.382873][ T6746] ? afs_put_call+0xa40/0xa40 [ 67.387544][ T6746] panic+0x2e3/0x75c [ 67.391442][ T6746] ? __warn_printk+0xf3/0xf3 [ 67.396027][ T6746] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 67.402184][ T6746] ? trace_hardirqs_on+0x55/0x220 [ 67.407201][ T6746] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.412739][ T6746] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.418271][ T6746] ? afs_put_call+0xa40/0xa40 [ 67.422941][ T6746] end_report+0x4d/0x53 [ 67.427088][ T6746] kasan_report.cold+0xd/0x37 [ 67.431768][ T6746] ? rcu_read_lock_held_common+0x51/0xa0 [ 67.437394][ T6746] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.442954][ T6746] afs_wake_up_async_call+0x6aa/0x770 [ 67.448314][ T6746] ? afs_close_socket+0x320/0x320 [ 67.453329][ T6746] ? afs_put_call+0xa40/0xa40 [ 67.457994][ T6746] rxrpc_notify_socket+0x1db/0x5d0 [ 67.463098][ T6746] ? afs_put_call+0xa40/0xa40 [ 67.467769][ T6746] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 67.474176][ T6746] rxrpc_call_completed+0xca/0xf0 [ 67.479195][ T6746] rxrpc_discard_prealloc+0x781/0xab0 [ 67.484560][ T6746] ? lock_sock_nested+0x94/0x110 [ 67.489489][ T6746] rxrpc_listen+0x147/0x360 [ 67.493985][ T6746] afs_close_socket+0x95/0x320 [ 67.498739][ T6746] ? afs_purge_servers+0x16d/0x300 [ 67.503841][ T6746] ? afs_rx_discard_new_call+0x50/0x50 [ 67.509292][ T6746] ? init_wait_var_entry+0x200/0x200 [ 67.514568][ T6746] ? rcu_read_lock_held_common+0xa0/0xa0 [ 67.520208][ T6746] ? check_preemption_disabled+0x38/0x220 [ 67.525931][ T6746] afs_net_exit+0x1bc/0x310 [ 67.530432][ T6746] ? afs_net_init+0xe30/0xe30 [ 67.535104][ T6746] ops_exit_list.isra.0+0xa8/0x150 [ 67.540206][ T6746] cleanup_net+0x511/0xa50 [ 67.544630][ T6746] ? unregister_pernet_device+0x70/0x70 [ 67.550173][ T6746] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 67.556145][ T6746] process_one_work+0x965/0x1690 [ 67.561085][ T6746] ? lock_release+0x800/0x800 [ 67.565755][ T6746] ? pwq_dec_nr_in_flight+0x310/0x310 [ 67.571143][ T6746] ? rwlock_bug.part.0+0x90/0x90 [ 67.576173][ T6746] worker_thread+0x96/0xe10 [ 67.580691][ T6746] ? process_one_work+0x1690/0x1690 [ 67.585886][ T6746] kthread+0x3b5/0x4a0 [ 67.589950][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.595678][ T6746] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.601391][ T6746] ret_from_fork+0x1f/0x30 [ 67.606940][ T6746] Kernel Offset: disabled [ 67.611253][ T6746] Rebooting in 86400 seconds..