Re: 【Bug】use-after-free in NVMe request double completion detected by kasan

[xiaohui li]

This bug only appears during concurrent stress testing, It has nothing
to do with what kinds of nvme disk to use.
Especially when conducting DDR stress testing, the consumption of DDR
bandwidth is high. Once the NVME driver is under pressure, the NVME IO
request times out，
and then this use-after-free bug appears with high probability.

and i find other pepole have also encountered this bug. such as below:
https://access.redhat.com/solutions/6993136   (System crash due to
use-after-free in NVMe request double completion)

i have no v6.6-rc1 kernel,
shall some one can give a bug-fix patch on 5.10.x linux kernel ?   many thanks.
or maybe give some advise on the reason why this bug has turn up.

Bagas Sanjaya <bagasdotme@xxxxxxxxx> 于2023年9月15日周五 16:10写道：
>
> On Fri, Sep 15, 2023 at 03:00:34PM +0800, xiaohui li wrote:
> > hello everyone:
> >
> > on my aarch64 board + linux kernel 5.10.4,  while doing nvme io test,
> > a use-after-free bug has been detected by kasan such as below,
> > as this bug has turned up frequently, with high probability.
> > in the end,  my nvme disk can't work right now.
> > hope some one can give me some advise on how to solve this problem, many thanks.
>
> Which nvme disk you have this issue?
>
> >
> > ------------------------------------------
> > nvme nvme0: I/O 75 QID 6 timeout, aborting
> > nvme nvme0: Abort status: 0x0
> > nvme nvme0: I/O 75 QID 6 timeout, reset controller
> > nvme nvme0: 15/0/0 default/read/poll queues
> >
> > [  163.462149][    C1] BUG: KASAN: use-after-free in
> > dma_direct_unmap_sg+0x78/0x298
> > [  163.469591][    C1] Read of size 8 at addr ffff0000462fa010 by task
> > kworker/u16:5/475
> > [  163.477457][    C1]
> > [  163.479679][    C1] CPU: 1 PID: 475 Comm: kworker/u16:5 Not tainted 5.10.4 #2
> > [  163.486847][    C1] Hardware name: Intellifusion Edge10 (DT)
> > [  163.492558][    C1] Workqueue: writeback wb_workfn (flush-259:0)
> > [  163.498618][    C1] Call trace:
> > [  163.501794][    C1]  dump_backtrace+0x0/0x2b8
> > [  163.506182][    C1]  show_stack+0x20/0x70
> > [  163.510230][    C1]  dump_stack+0xfc/0x168
> > [  163.514371][    C1]  print_address_description.constprop.0+0x70/0x4e4
> > [  163.520856][    C1]  kasan_report+0x138/0x208
> > [  163.525247][    C1]  __asan_load8+0x9c/0xd8
> > [  163.529466][    C1]  dma_direct_unmap_sg+0x78/0x298
> > [  163.534378][    C1]  dma_unmap_sg_attrs+0x64/0xb0
> > [  163.539126][    C1]  nvme_unmap_data+0xb0/0x298
> > [  163.543697][    C1]  nvme_pci_complete_rq+0x7c/0x140
> > [  163.548699][    C1]  nvme_irq+0x218/0x4a8
> > [  163.552749][    C1]  __handle_irq_event_percpu+0x8c/0x3c8
> > [  163.558188][    C1]  handle_irq_event_percpu+0x8c/0x108
> > [  163.563451][    C1]  handle_irq_event+0x6c/0x120
> > [  163.568105][    C1]  handle_simple_irq+0xe0/0x128
> > [  163.572846][    C1]  generic_handle_irq+0x54/0x70
> > [  163.577595][    C1]  edge_pcie_irq_domain_handler+0x128/0x1a8
> > [  163.583380][    C1]  generic_handle_irq+0x54/0x70
> > [  163.588121][    C1]  __handle_domain_irq+0x88/0xf0
> > [  163.592947][    C1]  gic_handle_irq+0xe4/0x128
> > [  163.597425][    C1]  el1_irq+0xc4/0x180
> > [  163.601296][    C1]  __asan_load8+0x70/0xd8
> > [  163.605518][    C1]  walk_stackframe+0x3c/0x78
> > [  163.609995][    C1]  arch_stack_walk+0xd4/0x168
> > [  163.614563][    C1]  stack_trace_save+0xa4/0xd8
> > [  163.619129][    C1]  kasan_save_stack+0x28/0x58
> > [  163.623695][    C1]  __kasan_kmalloc.isra.0+0xc8/0xe8
> > [  163.628783][    C1]  kasan_slab_alloc+0x18/0x28
> > [  163.633349][    C1]  kmem_cache_alloc+0x1a8/0x640
> > [  163.638089][    C1]  ext4_init_io_end+0x2c/0xb0
> > [  163.642657][    C1]  ext4_writepages+0x4bc/0x1288
> > [  163.647398][    C1]  do_writepages+0xc0/0x1a0
> > [  163.651796][    C1]  __writeback_single_inode+0x70/0x7e0
> > [  163.657148][    C1]  writeback_sb_inodes+0x324/0x708
> > [  163.662152][    C1]  __writeback_inodes_wb+0x70/0x158
> > [  163.667243][    C1]  wb_writeback+0x3ac/0x620
> > [  163.671636][    C1]  wb_workfn+0x3cc/0x900
> > [  163.675769][    C1]  process_one_work+0x3e8/0x888
> > [  163.680507][    C1]  worker_thread+0x7c/0x678
> > [  163.684901][    C1]  kthread+0x1e0/0x220
> > [  163.688858][    C1]  ret_from_fork+0x10/0x34
> > [  163.693154][    C1]
> > [  163.695365][    C1] Allocated by task 475:
> > [  163.699498][    C1]  stack_trace_save+0xa4/0xd8
> > [  163.704063][    C1]  kasan_save_stack+0x28/0x58
> > [  163.708628][    C1]  __kasan_kmalloc.isra.0+0xc8/0xe8
> > [  163.713715][    C1]  kasan_kmalloc+0x10/0x20
> > [  163.718017][    C1]  __kmalloc+0x3cc/0x690
> > [  163.722152][    C1]  mempool_kmalloc+0x24/0x30
> > [  163.726632][    C1]  mempool_alloc+0xe8/0x218
> > [  163.731027][    C1]  nvme_map_data+0xf0/0xda8
> > [  163.735419][    C1]  nvme_queue_rq+0x148/0x3b8
> > [  163.739903][    C1]  __blk_mq_try_issue_directly+0x214/0x2e8
> > [  163.745602][    C1]  blk_mq_request_issue_directly+0xbc/0x108
> > [  163.751388][    C1]  blk_mq_try_issue_list_directly+0xe8/0x1d8
> > [  163.757266][    C1]  blk_mq_sched_insert_requests+0x230/0x300
> > [  163.763052][    C1]  blk_mq_flush_plug_list+0x22c/0x3c8
> > [  163.768318][    C1]  blk_flush_plug_list+0x1e4/0x228
> > [  163.773319][    C1]  blk_mq_submit_bio+0x40c/0xa50
> > [  163.778147][    C1]  submit_bio_noacct+0x590/0x630
> > [  163.782965][    C1]  submit_bio+0xc8/0x360
> > [  163.787093][    C1]  ext4_io_submit+0xa8/0xd0
> > [  163.791485][    C1]  ext4_writepages+0x8f8/0x1288
> > [  163.796224][    C1]  do_writepages+0xc0/0x1a0
> > [  163.800621][    C1]  __writeback_single_inode+0x70/0x7e0
> > [  163.805974][    C1]  writeback_sb_inodes+0x324/0x708
> > [  163.810978][    C1]  __writeback_inodes_wb+0x70/0x158
> > [  163.816068][    C1]  wb_writeback+0x3ac/0x620
> > [  163.820461][    C1]  wb_workfn+0x3cc/0x900
> > [  163.824590][    C1]  process_one_work+0x3e8/0x888
> > [  163.829328][    C1]  worker_thread+0x7c/0x678
> > [  163.833721][    C1]  kthread+0x1e0/0x220
> > [  163.837677][    C1]  ret_from_fork+0x10/0x34
> > [  163.841972][    C1]
> > [  163.844181][    C1] Freed by task 475:
> > [  163.847967][    C1]  stack_trace_save+0xa4/0xd8
> > [  163.852533][    C1]  kasan_save_stack+0x28/0x58
> > [  163.857097][    C1]  kasan_set_track+0x28/0x40
> > [  163.861577][    C1]  kasan_set_free_info+0x24/0x48
> > [  163.866402][    C1]  __kasan_slab_free+0x100/0x180
> > [  163.871227][    C1]  kasan_slab_free+0x14/0x20
> > [  163.875703][    C1]  kfree+0xe0/0x400
> > [  163.879401][    C1]  mempool_kfree+0x18/0x28
> > [  163.883706][    C1]  mempool_free+0x7c/0x1e0
> > [  163.888013][    C1]  nvme_unmap_data+0x1ac/0x298
> > [  163.892668][    C1]  nvme_pci_complete_rq+0x7c/0x140
> > [  163.897670][    C1]  nvme_irq+0x218/0x4a8
> > [  163.901717][    C1]  __handle_irq_event_percpu+0x8c/0x3c8
> > [  163.907155][    C1]  handle_irq_event_percpu+0x8c/0x108
> > [  163.912419][    C1]  handle_irq_event+0x6c/0x120
> > [  163.917072][    C1]  handle_simple_irq+0xe0/0x128
> > [  163.921812][    C1]  generic_handle_irq+0x54/0x70
> > [  163.926560][    C1]  edge_pcie_irq_domain_handler+0x128/0x1a8
> > [  163.932345][    C1]  generic_handle_irq+0x54/0x70
> > [  163.937085][    C1]  __handle_domain_irq+0x88/0xf0
> > [  163.941909][    C1]  gic_handle_irq+0xe4/0x128
> > [  163.946378][    C1]
> > [  163.948594][    C1] The buggy address belongs to the object at
> > ffff0000462fa000
> > [  163.948594][    C1]  which belongs to the cache kmalloc-4k of size 4096
> > [  163.962561][    C1] The buggy address is located 16 bytes inside of
> > [  163.962561][    C1]  4096-byte region [ffff0000462fa000, ffff0000462fb000)
> > [  163.975734][    C1] The buggy address belongs to the page:
> > [  163.981262][    C1] page:00000000925a6593 refcount:1 mapcount:0
> > mapping:0000000000000000 index:0x0 pfn:0x2462f8
> > [  163.991397][    C1] head:00000000925a6593 order:3
> > compound_mapcount:0 compound_pincount:0
> > [  163.999622][    C1] flags: 0x4000000000010200(slab|head)
> > [  164.004983][    C1] raw: 4000000000010200 dead000000000100
> > dead000000000122 ffff000042003500
> > [  164.013469][    C1] raw: 0000000000000000 0000000000040004
> > 00000001ffffffff 0000000000000000
> > [  164.021946][    C1] page dumped because: kasan: bad access detected
> > [  164.028242][    C1]
> > [  164.030450][    C1] Memory state around the buggy address:
> > [  164.035973][    C1]  ffff0000462f9f00: fc fc fc fc fc fc fc fc fc
> > fc fc fc fc fc fc fc
> > [  164.043934][    C1]  ffff0000462f9f80: fc fc fc fc fc fc fc fc fc
> > fc fc fc fc fc fc fc
> > [  164.051894][    C1] >ffff0000462fa000: fa fb fb fb fb fb fb fb fb
> > fb fb fb fb fb fb fb
> > [  164.059848][    C1]                          ^
> > [  164.064326][    C1]  ffff0000462fa080: fb fb fb fb fb fb fb fb fb
> > fb fb fb fb fb fb fb
> > [  164.072287][    C1]  ffff0000462fa100: fb fb fb fb fb fb fb fb fb
> > fb fb fb fb fb fb fb
> >
> > ....
> >
> > [  164.102216][    C1] BUG: KASAN: double-free or invalid-free in
> > mempool_kfree+0x18/0x28
> > [  164.110169][    C1]
> > [  164.112390][    C1] CPU: 1 PID: 475 Comm: kworker/u16:5 Tainted: G
> >   B             5.10.4 #2
> > [  164.120955][    C1] Hardware name: Intellifusion Edge10 (DT)
> > [  164.126661][    C1] Workqueue: writeback wb_workfn (flush-259:0)
> > [  164.132720][    C1] Call trace:
> > [  164.135892][    C1]  dump_backtrace+0x0/0x2b8
> > [  164.140282][    C1]  show_stack+0x20/0x70
> > [  164.144328][    C1]  dump_stack+0xfc/0x168
> > [  164.148469][    C1]  print_address_description.constprop.0+0x70/0x4e4
> > [  164.154951][    C1]  kasan_report_invalid_free+0x64/0x90
> > [  164.160299][    C1]  __kasan_slab_free+0x154/0x180
> > [  164.165126][    C1]  kasan_slab_free+0x14/0x20
> > [  164.169601][    C1]  kfree+0xe0/0x400
> > [  164.173299][    C1]  mempool_kfree+0x18/0x28
> > [  164.177605][    C1]  mempool_free+0x7c/0x1e0
> > [  164.181914][    C1]  nvme_unmap_data+0x1ac/0x298
> > [  164.186569][    C1]  nvme_pci_complete_rq+0x7c/0x140
> > [  164.191570][    C1]  nvme_irq+0x218/0x4a8
> > [  164.195619][    C1]  __handle_irq_event_percpu+0x8c/0x3c8
> > [  164.201058][    C1]  handle_irq_event_percpu+0x8c/0x108
> > [  164.206322][    C1]  handle_irq_event+0x6c/0x120
> > [  164.210976][    C1]  handle_simple_irq+0xe0/0x128
> > [  164.215717][    C1]  generic_handle_irq+0x54/0x70
> > [  164.220464][    C1]  edge_pcie_irq_domain_handler+0x128/0x1a8
> > [  164.226250][    C1]  generic_handle_irq+0x54/0x70
> > [  164.230992][    C1]  __handle_domain_irq+0x88/0xf0
> > [  164.235817][    C1]  gic_handle_irq+0xe4/0x128
> > [  164.240292][    C1]  el1_irq+0xc4/0x180
> > [  164.244163][    C1]  __asan_load8+0x70/0xd8
> > [  164.248384][    C1]  walk_stackframe+0x3c/0x78
> > [  164.252860][    C1]  arch_stack_walk+0xd4/0x168
> > [  164.257429][    C1]  stack_trace_save+0xa4/0xd8
> > [  164.261995][    C1]  kasan_save_stack+0x28/0x58
> > [  164.266561][    C1]  __kasan_kmalloc.isra.0+0xc8/0xe8
> > [  164.271650][    C1]  kasan_slab_alloc+0x18/0x28
> > [  164.276213][    C1]  kmem_cache_alloc+0x1a8/0x640
> > [  164.280952][    C1]  ext4_init_io_end+0x2c/0xb0
> > [  164.285517][    C1]  ext4_writepages+0x4bc/0x1288
> > [  164.290257][    C1]  do_writepages+0xc0/0x1a0
> > [  164.294655][    C1]  __writeback_single_inode+0x70/0x7e0
> > [  164.300008][    C1]  writeback_sb_inodes+0x324/0x708
> > [  164.305012][    C1]  __writeback_inodes_wb+0x70/0x158
> > [  164.310102][    C1]  wb_writeback+0x3ac/0x620
> > [  164.314497][    C1]  wb_workfn+0x3cc/0x900
> > [  164.318628][    C1]  process_one_work+0x3e8/0x888
> > [  164.323365][    C1]  worker_thread+0x7c/0x678
> > [  164.327759][    C1]  kthread+0x1e0/0x220
> > [  164.331716][    C1]  ret_from_fork+0x10/0x34
> > [  164.336013][    C1]
> > [  164.338223][    C1] Allocated by task 475:
> > [  164.342356][    C1]  stack_trace_save+0xa4/0xd8
> > [  164.346921][    C1]  kasan_save_stack+0x28/0x58
> > [  164.351487][    C1]  __kasan_kmalloc.isra.0+0xc8/0xe8
> > [  164.356574][    C1]  kasan_kmalloc+0x10/0x20
> > [  164.360876][    C1]  __kmalloc+0x3cc/0x690
> > [  164.365009][    C1]  mempool_kmalloc+0x24/0x30
> > [  164.369488][    C1]  mempool_alloc+0xe8/0x218
> > [  164.373883][    C1]  nvme_map_data+0xf0/0xda8
> > [  164.378276][    C1]  nvme_queue_rq+0x148/0x3b8
> > [  164.382760][    C1]  __blk_mq_try_issue_directly+0x214/0x2e8
> > [  164.388460][    C1]  blk_mq_request_issue_directly+0xbc/0x108
> > [  164.394246][    C1]  blk_mq_try_issue_list_directly+0xe8/0x1d8
> > [  164.400125][    C1]  blk_mq_sched_insert_requests+0x230/0x300
> > [  164.405909][    C1]  blk_mq_flush_plug_list+0x22c/0x3c8
> > [  164.411175][    C1]  blk_flush_plug_list+0x1e4/0x228
> > [  164.416177][    C1]  blk_mq_submit_bio+0x40c/0xa50
> > [  164.421005][    C1]  submit_bio_noacct+0x590/0x630
> > [  164.425831][    C1]  submit_bio+0xc8/0x360
> > [  164.429960][    C1]  ext4_io_submit+0xa8/0xd0
> > [  164.434352][    C1]  ext4_writepages+0x8f8/0x1288
> > [  164.439090][    C1]  do_writepages+0xc0/0x1a0
> > [  164.443487][    C1]  __writeback_single_inode+0x70/0x7e0
> > [  164.448838][    C1]  writeback_sb_inodes+0x324/0x708
> > [  164.453842][    C1]  __writeback_inodes_wb+0x70/0x158
> > [  164.458931][    C1]  wb_writeback+0x3ac/0x620
> > [  164.463325][    C1]  wb_workfn+0x3cc/0x900
> > [  164.467456][    C1]  process_one_work+0x3e8/0x888
> > [  164.472193][    C1]  worker_thread+0x7c/0x678
> > [  164.476585][    C1]  kthread+0x1e0/0x220
> > [  164.480541][    C1]  ret_from_fork+0x10/0x34
> > [  164.484836][    C1]
> > [  164.487045][    C1] Freed by task 475:
> > [  164.490828][    C1]  stack_trace_save+0xa4/0xd8
> > [  164.495393][    C1]  kasan_save_stack+0x28/0x58
> > [  164.499958][    C1]  kasan_set_track+0x28/0x40
> > [  164.504438][    C1]  kasan_set_free_info+0x24/0x48
> > [  164.509264][    C1]  __kasan_slab_free+0x100/0x180
> > [  164.514089][    C1]  kasan_slab_free+0x14/0x20
> > [  164.518564][    C1]  kfree+0xe0/0x400
> > [  164.522261][    C1]  mempool_kfree+0x18/0x28
> > [  164.526567][    C1]  mempool_free+0x7c/0x1e0
> > [  164.530875][    C1]  nvme_unmap_data+0x1ac/0x298
> > [  164.535529][    C1]  nvme_pci_complete_rq+0x7c/0x140
> > [  164.540531][    C1]  nvme_irq+0x218/0x4a8
> > [  164.544577][    C1]  __handle_irq_event_percpu+0x8c/0x3c8
> > [  164.550016][    C1]  handle_irq_event_percpu+0x8c/0x108
> > [  164.555279][    C1]  handle_irq_event+0x6c/0x120
> > [  164.559931][    C1]  handle_simple_irq+0xe0/0x128
> > [  164.564672][    C1]  generic_handle_irq+0x54/0x70
> > [  164.569408][    C1]  edge_pcie_irq_domain_handler+0x128/0x1a8
> > [  164.575192][    C1]  generic_handle_irq+0x54/0x70
> > [  164.579932][    C1]  __handle_domain_irq+0x88/0xf0
> > [  164.584757][    C1]  gic_handle_irq+0xe4/0x128
> > [  164.589225][    C1]
> > [  164.591439][    C1] The buggy address belongs to the object at
> > ffff0000462fa000
> > [  164.591439][    C1]  which belongs to the cache kmalloc-4k of size 4096
> > [  164.605405][    C1] The buggy address is located 0 bytes inside of
> > [  164.605405][    C1]  4096-byte region [ffff0000462fa000, ffff0000462fb000)
> > [  164.618491][    C1] The buggy address belongs to the page:
> > [  164.624015][    C1] page:00000000925a6593 refcount:1 mapcount:0
> > mapping:0000000000000000 index:0x0 pfn:0x2462f8
> > [  164.634151][    C1] head:00000000925a6593 order:3
> > compound_mapcount:0 compound_pincount:0
> > [  164.642374][    C1] flags: 0x4000000000010200(slab|head)
> > [  164.647732][    C1] raw: 4000000000010200 dead000000000100
> > dead000000000122 ffff000042003500
> > [  164.656218][    C1] raw: 0000000000000000 0000000000040004
> > 00000001ffffffff 0000000000000000
> > [  164.664694][    C1] page dumped because: kasan: bad access detected
> > [  164.670990][    C1]
> > [  164.673199][    C1] Memory state around the buggy address:
> > [  164.678721][    C1]  ffff0000462f9f00: fc fc fc fc fc fc fc fc fc
> > fc fc fc fc fc fc fc
> > [  164.686682][    C1]  ffff0000462f9f80: fc fc fc fc fc fc fc fc fc
> > fc fc fc fc fc fc fc
> > [  164.694642][    C1] >ffff0000462fa000: fa fb fb fb fb fb fb fb fb
> > fb fb fb fb fb fb fb
> > [  164.702594][    C1]                    ^
> > [  164.706550][    C1]  ffff0000462fa080: fb fb fb fb fb fb fb fb fb
> > fb fb fb fb fb fb fb
> > [  164.714510][    C1]  ffff0000462fa100: fb fb fb fb fb fb fb fb fb
> > fb fb fb fb fb fb fb
> > [  164.722464][    C1]
> > ==================================================================
> > [  164.730436][    C1] ------------[ cut here ]------------
> > [  164.735781][    C1] refcount_t: underflow; use-after-free.
> > [  164.741420][    C1] WARNING: CPU: 1 PID: 475 at lib/refcount.c:28
> > refcount_warn_saturate+0x11c/0x178
> > [  164.750600][    C1] Modules linked in:
> > [  164.754402][    C1] CPU: 1 PID: 475 Comm: kworker/u16:5 Tainted: G
> >   B             5.10.4 #2
> > [  164.762967][    C1] Hardware name: Intellifusion Edge10 (DT)
> > [  164.768677][    C1] Workqueue: writeback wb_workfn (flush-259:0)
> > [  164.774741][    C1] pstate: 60400085 (nZCv daIf +PAN -UAO -TCO BTYPE=--)
> > [  164.781489][    C1] pc : refcount_warn_saturate+0x11c/0x178
> > [  164.787103][    C1] lr : refcount_warn_saturate+0x11c/0x178
> > [  164.792706][    C1] sp : ffff0000eb4a0fe0
> > [  164.796743][    C1] x29: ffff0000eb4a0fe0 x28: 0000000000000000
> > [  164.802800][    C1] x27: 00000000000001a2 x26: ffff0000453671f6
> > [  164.808856][    C1] x25: fffffdffbfeeaf00 x24: ffff0000457b751c
> > [  164.814913][    C1] x23: ffff0000457b7518 x22: 0000000000000000
> > [  164.820969][    C1] x21: ffff000045e70000 x20: ffff0000457b75d0
> > [  164.827024][    C1] x19: 0000000000000003 x18: 0000000000000000
> > [  164.833078][    C1] x17: 0000000000000000 x16: 0000000000000000
> > [  164.839133][    C1] x15: 0000000000000000 x14: 0720072007200720
> > [  164.845191][    C1] x13: 0720072007200720 x12: ffff80001d690d0c
> > [  164.851248][    C1] x11: 1fffe0001d690d0b x10: ffff80001d690d0b
> > [  164.857305][    C1] x9 : dfffa00000000000 x8 : ffff0000eb48685b
> > [  164.863360][    C1] x7 : 0000000000000001 x6 : ffff0000eb486858
> > [  164.869416][    C1] x5 : 00007fffe296f2f5 x4 : dfffa00000000000
> > [  164.875473][    C1] x3 : ffffa000100e359c x2 : ffff80001d6941c6
> > [  164.881529][    C1] x1 : 050c75be6612ca00 x0 : 0000000000000000
> > [  164.887584][    C1] Call trace:
> > [  164.890766][    C1]  refcount_warn_saturate+0x11c/0x178
> > [  164.896031][    C1]  blk_mq_free_request+0x254/0x2c0
> > [  164.901032][    C1]  blk_mq_end_request+0x1c4/0x1e8
> > [  164.905951][    C1]  nvme_complete_rq+0xa8/0x458
> > [  164.910608][    C1]  nvme_pci_complete_rq+0x84/0x140
> > [  164.915610][    C1]  nvme_irq+0x218/0x4a8
> > [  164.919660][    C1]  __handle_irq_event_percpu+0x8c/0x3c8
> > [  164.925098][    C1]  handle_irq_event_percpu+0x8c/0x108
> > [  164.930362][    C1]  handle_irq_event+0x6c/0x120
> > [  164.935016][    C1]  handle_simple_irq+0xe0/0x128
> > [  164.939756][    C1]  generic_handle_irq+0x54/0x70
> > [  164.944502][    C1]  edge_pcie_irq_domain_handler+0x128/0x1a8
> > [  164.950287][    C1]  generic_handle_irq+0x54/0x70
> > [  164.955028][    C1]  __handle_domain_irq+0x88/0xf0
> > [  164.959854][    C1]  gic_handle_irq+0xe4/0x128
> > [  164.964331][    C1]  el1_irq+0xc4/0x180
> > [  164.968202][    C1]  __asan_load8+0x70/0xd8
> > [  164.972425][    C1]  walk_stackframe+0x3c/0x78
> > [  164.976902][    C1]  arch_stack_walk+0xd4/0x168
> > [  164.981471][    C1]  stack_trace_save+0xa4/0xd8
> > [  164.986036][    C1]  kasan_save_stack+0x28/0x58
> > [  164.990603][    C1]  __kasan_kmalloc.isra.0+0xc8/0xe8
> > [  164.995690][    C1]  kasan_slab_alloc+0x18/0x28
> > [  165.000254][    C1]  kmem_cache_alloc+0x1a8/0x640
> > [  165.004992][    C1]  ext4_init_io_end+0x2c/0xb0
> > [  165.009559][    C1]  ext4_writepages+0x4bc/0x1288
> > [  165.014301][    C1]  do_writepages+0xc0/0x1a0
> > [  165.018699][    C1]  __writeback_single_inode+0x70/0x7e0
> > [  165.024051][    C1]  writeback_sb_inodes+0x324/0x708
> > [  165.029055][    C1]  __writeback_inodes_wb+0x70/0x158
> > [  165.034145][    C1]  wb_writeback+0x3ac/0x620
> > [  165.038539][    C1]  wb_workfn+0x3cc/0x900
> > [  165.042669][    C1]  process_one_work+0x3e8/0x888
> > [  165.047406][    C1]  worker_thread+0x7c/0x678
> > [  165.051800][    C1]  kthread+0x1e0/0x220
> > [  165.055757][    C1]  ret_from_fork+0x10/0x34
> > [  165.060058][    C1] ---[ end trace 39fad493b57b2c12 ]---
> > [  165.188702][    C4] nvme nvme0: invalid id 0 completed on queue 5
> > [  165.247987][    C4] nvme nvme0: invalid id 0 completed on queue 5
> > [  165.307319][    C4] nvme nvme0: invalid id 0 completed on queue 5
> > [  193.539269][  T154] nvme nvme0: I/O 392 QID 2 timeout, aborting
> > [  193.588563][    C6] nvme nvme0: Abort status: 0x0
> >
>
> Can you test latest mainline (currently v6.6-rc1)?
>
> --
> An old man doll... just what I always wanted! - Clara