Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '[localhost]:4486' (ECDSA) to the list of known hosts. syzkaller login: [ 125.514088][ T1172] BUG: using smp_processor_id() in preemptible [00000000] code: khugepaged/1172 [ 125.530998][ T1172] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 125.545478][ T1172] CPU: 3 PID: 1172 Comm: khugepaged Not tainted 5.7.0-syzkaller #0 [ 125.565332][ T1172] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 125.605252][ T1172] Call Trace: [ 125.615437][ T1172] dump_stack+0x18f/0x20d [ 125.635271][ T1172] debug_smp_processor_id.cold+0x88/0x9b [ 125.665298][ T1172] ext4_mb_new_blocks+0xa4d/0x3b70 [ 125.685347][ T1172] ? ext4_find_extent+0x81a/0xad0 [ 125.705489][ T1172] ? ext4_ext_search_right+0x2ca/0xb20 [ 125.725225][ T1172] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 125.765278][ T1172] ext4_ext_map_blocks+0x201b/0x33e0 [ 125.785914][ T1172] ? ext4_ext_release+0x10/0x10 [ 125.815465][ T1172] ? down_write_killable+0x170/0x170 [ 125.835327][ T1172] ? ext4_es_lookup_extent+0x41d/0xd10 [ 125.855792][ T1172] ext4_map_blocks+0x4cb/0x1640 [ 125.875294][ T1172] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 125.895164][ T1172] ? debug_smp_processor_id+0x2f/0x185 [ 125.915237][ T1172] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 125.935143][ T1172] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 125.955211][ T1172] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 125.985704][ T1172] ext4_writepages+0x1a7b/0x33c0 [ 126.005409][ T1172] ? mark_lock+0x70/0xdd0 [ 126.015140][ T1172] ? __ext4_mark_inode_dirty+0x940/0x940 [ 126.045294][ T1172] ? __ext4_mark_inode_dirty+0x940/0x940 [ 126.065521][ T1172] ? do_writepages+0xfa/0x2a0 [ 126.075335][ T1172] do_writepages+0xfa/0x2a0 [ 126.105385][ T1172] ? page_writeback_cpu_online+0x10/0x10 [ 126.135273][ T1172] ? do_raw_spin_unlock+0x171/0x260 [ 126.155325][ T1172] ? _raw_spin_unlock+0x24/0x40 [ 126.175211][ T1172] __filemap_fdatawrite_range+0x2aa/0x390 [ 126.205743][ T1172] ? collapse_file+0x35a2/0x4330 [ 126.235289][ T1172] ? delete_from_page_cache_batch+0xeb0/0xeb0 [ 126.255220][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 126.285530][ T1172] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 126.305694][ T1172] collapse_file+0x35ac/0x4330 [ 126.325354][ T1172] ? collapse_huge_page+0x4350/0x4350 [ 126.345254][ T1172] ? khugepaged+0x2506/0x3fc0 [ 126.365261][ T1172] ? xas_find+0x31a/0x880 [ 126.375225][ T1172] khugepaged+0x3041/0x3fc0 [ 126.385563][ T1172] ? __kthread_parkme+0xae/0x1e0 [ 126.405378][ T1172] ? collapse_pte_mapped_thp+0xbf0/0xbf0 [ 126.415294][ T1172] ? lock_downgrade+0x840/0x840 [ 126.425324][ T1172] ? finish_wait+0x260/0x260 [ 126.435070][ T1172] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 126.455099][ T1172] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 126.465319][ T1172] ? __kthread_parkme+0x13f/0x1e0 [ 126.475052][ T1172] ? collapse_pte_mapped_thp+0xbf0/0xbf0 [ 126.495124][ T1172] kthread+0x3b5/0x4a0 [ 126.506026][ T1172] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 126.525200][ T1172] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 126.535213][ T1172] ret_from_fork+0x24/0x30 [ 127.085309][ T1172] BUG: using smp_processor_id() in preemptible [00000000] code: khugepaged/1172 [ 127.162397][ T1172] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 127.212421][ T1172] CPU: 2 PID: 1172 Comm: khugepaged Not tainted 5.7.0-syzkaller #0 [ 127.217913][ T1172] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 127.217913][ T1172] Call Trace: [ 127.217913][ T1172] dump_stack+0x18f/0x20d [ 127.217913][ T1172] debug_smp_processor_id.cold+0x88/0x9b [ 127.217913][ T1172] ext4_mb_new_blocks+0xa4d/0x3b70 [ 127.217913][ T1172] ? ext4_ext_search_right+0x2ca/0xb20 [ 127.217913][ T1172] ? ext4_ext_next_allocated_block+0x221/0x2d0 [ 127.217913][ T1172] ext4_ext_map_blocks+0x201b/0x33e0 [ 127.217913][ T1172] ? ext4_ext_release+0x10/0x10 [ 127.217913][ T1172] ? down_write_killable+0x170/0x170 [ 127.217913][ T1172] ? ext4_es_lookup_extent+0x41d/0xd10 [ 127.217913][ T1172] ext4_map_blocks+0x4cb/0x1640 [ 127.217913][ T1172] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 127.217913][ T1172] ? debug_smp_processor_id+0x2f/0x185 [ 127.217913][ T1172] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 127.217913][ T1172] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 127.828527][ T1172] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 127.828527][ T1172] ext4_writepages+0x1a7b/0x33c0 [ 127.828527][ T1172] ? mark_lock+0x70/0xdd0 [ 127.828527][ T1172] ? __ext4_mark_inode_dirty+0x940/0x940 [ 127.828527][ T1172] ? __ext4_mark_inode_dirty+0x940/0x940 [ 127.828527][ T1172] ? do_writepages+0xfa/0x2a0 [ 127.828527][ T1172] do_writepages+0xfa/0x2a0 [ 127.828527][ T1172] ? page_writeback_cpu_online+0x10/0x10 [ 127.828527][ T1172] ? do_raw_spin_unlock+0x171/0x260 [ 127.828527][ T1172] ? _raw_spin_unlock+0x24/0x40 [ 127.828527][ T1172] __filemap_fdatawrite_range+0x2aa/0x390 [ 127.828527][ T1172] ? collapse_file+0x35a2/0x4330 [ 127.828527][ T1172] ? delete_from_page_cache_batch+0xeb0/0xeb0 [ 127.828527][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 127.828527][ T1172] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 127.828527][ T1172] collapse_file+0x35ac/0x4330 [ 127.828527][ T1172] ? collapse_huge_page+0x4350/0x4350 [ 127.828527][ T1172] ? khugepaged+0x2506/0x3fc0 [ 127.828527][ T1172] ? xas_find+0x31a/0x880 [ 127.828527][ T1172] khugepaged+0x3041/0x3fc0 [ 127.828527][ T1172] ? __kthread_parkme+0xae/0x1e0 [ 127.828527][ T1172] ? collapse_pte_mapped_thp+0xbf0/0xbf0 [ 127.828527][ T1172] ? lock_downgrade+0x840/0x840 [ 127.828527][ T1172] ? finish_wait+0x260/0x260 [ 127.828527][ T1172] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 127.828527][ T1172] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 127.828527][ T1172] ? __kthread_parkme+0x13f/0x1e0 [ 127.828527][ T1172] ? collapse_pte_mapped_thp+0xbf0/0xbf0 [ 127.828527][ T1172] kthread+0x3b5/0x4a0 [ 127.828527][ T1172] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 127.828527][ T1172] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 127.828527][ T1172] ret_from_fork+0x24/0x30 [ 129.174602][ T1172] BUG: using smp_processor_id() in preemptible [00000000] code: khugepaged/1172 [ 129.222780][ T1172] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 129.251166][ T1172] CPU: 3 PID: 1172 Comm: khugepaged Not tainted 5.7.0-syzkaller #0 [ 129.295354][ T1172] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 129.343970][ T1172] Call Trace: [ 129.355390][ T1172] dump_stack+0x18f/0x20d [ 129.365510][ T1172] debug_smp_processor_id.cold+0x88/0x9b [ 129.386871][ T1172] ext4_mb_new_blocks+0xa4d/0x3b70 [ 129.397339][ T1172] ? ext4_ext_search_right+0x2ca/0xb20 [ 129.419316][ T1172] ? ext4_ext_next_allocated_block+0x221/0x2d0 [ 129.435220][ T1172] ext4_ext_map_blocks+0x201b/0x33e0 [ 129.455137][ T1172] ? ext4_ext_release+0x10/0x10 [ 129.475226][ T1172] ? down_write_killable+0x170/0x170 [ 129.495220][ T1172] ? ext4_es_lookup_extent+0x41d/0xd10 [ 129.516790][ T1172] ext4_map_blocks+0x4cb/0x1640 [ 129.538358][ T1172] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 129.560060][ T1172] ? debug_smp_processor_id+0x2f/0x185 [ 129.581492][ T1172] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 129.603002][ T1172] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 129.624352][ T1172] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 129.635492][ T1172] ext4_writepages+0x1a7b/0x33c0 [ 129.656960][ T1172] ? mark_lock+0x70/0xdd0 [ 129.675296][ T1172] ? __ext4_mark_inode_dirty+0x940/0x940 [ 129.689230][ T1172] ? __ext4_mark_inode_dirty+0x940/0x940 [ 129.699744][ T1172] ? do_writepages+0xfa/0x2a0 [ 129.715103][ T1172] do_writepages+0xfa/0x2a0 [ 129.720657][ T1172] ? page_writeback_cpu_online+0x10/0x10 [ 129.735051][ T1172] ? do_raw_spin_unlock+0x171/0x260 [ 129.741319][ T1172] ? _raw_spin_unlock+0x24/0x40 [ 129.755358][ T1172] __filemap_fdatawrite_range+0x2aa/0x390 [ 129.765115][ T1172] ? collapse_file+0x35a2/0x4330 [ 129.775022][ T1172] ? delete_from_page_cache_batch+0xeb0/0xeb0 [ 129.783509][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 129.795187][ T1172] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 129.804364][ T1172] collapse_file+0x35ac/0x4330 [ 129.815178][ T1172] ? collapse_huge_page+0x4350/0x4350 [ 129.825195][ T1172] ? khugepaged+0x2506/0x3fc0 [ 129.835543][ T1172] ? xas_find+0x31a/0x880 [ 129.845972][ T1172] khugepaged+0x3041/0x3fc0 [ 129.856261][ T1172] ? __kthread_parkme+0xae/0x1e0 [ 129.866761][ T1172] ? collapse_pte_mapped_thp+0xbf0/0xbf0 [ 129.877234][ T1172] ? lock_downgrade+0x840/0x840 [ 129.887613][ T1172] ? finish_wait+0x260/0x260 [ 129.897995][ T1172] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 129.908428][ T1172] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 129.918779][ T1172] ? __kthread_parkme+0x13f/0x1e0 [ 129.935171][ T1172] ? collapse_pte_mapped_thp+0xbf0/0xbf0 [ 129.950129][ T1172] kthread+0x3b5/0x4a0 [ 129.960749][ T1172] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 129.981712][ T1172] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 129.995281][ T1172] ret_from_fork+0x24/0x30