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SubjectRe: [PATCH FIXES/IMPROVEMENTS 0/7] block, bfq: preserve control, boost throughput, fix bugs
Date
Hello.

On úterý 22. června 2021 18:29:48 CEST Jan Kara wrote:
> On Tue 22-06-21 09:35:05, Oleksandr Natalenko wrote:
> > On úterý 22. června 2021 9:08:43 CEST Paolo Valente wrote:
> > > CCing also Jan and Khazhy, because in your commit log I see also the
> > > commit on bfq_requests_merged().
> > >
> > > Is this OOPS reproducible for you?
> >
> > No, I haven't found a reproducer, at least yet. It took half a day of
> > uptime to hit this, so might not be that easy.
>
> Hum, if you can acquire a crash dump it would be the easiest I guess. We'd
> need to find out more about the request we crash on - whether it's
> otherwise valid, in what state it is etc...

Still have no reliable reproducer and no vmcore, however I'm running v5.13
with the following patches applied on top of it:

```
blk: Fix lock inversion between ioc lock and bfqd lock
bfq: Remove merged request already in bfq_requests_merged()
block: Remove unnecessary elevator operation checks
block: Do not pull requests from the scheduler when we cannot dispatch them
block, bfq: reset waker pointer with shared queues
block, bfq: check waker only for queues with no in-flight I/O
block, bfq: avoid delayed merge of async queues
block, bfq: boost throughput by extending queue-merging times
block, bfq: consider also creation time in delayed stable merge
block, bfq: fix delayed stable merge check
block, bfq: let also stably merged queues enjoy weight raising
```

and just got the following crash:

```
[60313.522570] ------------[ cut here ]------------
[60313.522579] WARNING: CPU: 20 PID: 388 at arch/x86/include/asm/kfence.h:44
kfence_protect_page+0x39/0xc0
[60313.522586] Modules linked in: sctp ip6_udp_tunnel udp_tunnel uinput
netconsole blocklayoutdriver rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver
nfs lockd grace sunrpc fscache netfs rfcomm nft_ct nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 cmac algif_hash algif_skcipher nf_tables af_alg bnep tun
nfnetlink nls_iso8859_1 intel_rapl_msr vfat intel_rapl_common iwlmvm fat
mac80211 edac_mce_amd libarc4 btusb eeepc_wmi btrtl asus_wmi iwlwifi btbcm
snd_usb_audio sparse_keymap kvm_amd video wmi_bmof mxm_wmi btintel uvcvideo
snd_hda_codec_realtek videobuf2_vmalloc videobuf2_memops snd_usbmidi_lib kvm
snd_hda_codec_generic bluetooth videobuf2_v4l2 ledtrig_audio
snd_hda_codec_hdmi joydev snd_rawmidi ecdh_generic irqbypass ecc snd_hda_intel
mousedev pl2303 cfg80211 snd_seq_device videobuf2_common crc16 rapl k10temp
snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec igb r8169 sp5100_tco
snd_hda_core realtek i2c_piix4 ipmi_devintf dca snd_hwdep mdio_devres rfkill
snd_pcm libphy ipmi_msghandler wmi
[60313.522630] pinctrl_amd mac_hid acpi_cpufreq tcp_bbr2 vhost_vsock
vmw_vsock_virtio_transport_common vhost vhost_iotlb vsock v4l2loopback
videodev mc snd_hrtimer snd_timer snd soundcore nct6775 hwmon_vid crypto_user
fuse ip_tables x_tables xfs dm_thin_pool dm_persistent_data dm_bio_prison
dm_bufio libcrc32c crc32c_generic dm_crypt cbc encrypted_keys trusted
asn1_encoder tee hid_logitech_hidpp hid_logitech_dj usbhid dm_mod
crct10dif_pclmul crc32_pclmul crc32c_intel raid10 ghash_clmulni_intel
aesni_intel md_mod crypto_simd cryptd amdgpu ccp xhci_pci xhci_pci_renesas
tpm_crb tpm_tis tpm_tis_core tpm rng_core drm_ttm_helper ttm gpu_sched
i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec
drm agpgart
[60313.522665] CPU: 20 PID: 388 Comm: kworker/20:1H Tainted: G W
5.13.0-pf2 #1
[60313.522668] Hardware name: ASUS System Product Name/Pro WS X570-ACE, BIOS
3601 05/26/2021
[60313.522671] Workqueue: kblockd blk_mq_run_work_fn
[60313.522675] RIP: 0010:kfence_protect_page+0x39/0xc0
[60313.522679] Code: 04 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 c7 44
24 04 00 00 00 00 e8 83 20 d5 ff 48 85 c0 74 07 83 7c 24 04 01 74 06 <0f> 0b 31
c0 eb 4c 48 8b 38 48 89 c2 84 db 75 59 48 89 f8 0f 1f 40
[60313.522682] RSP: 0018:ffffb559c0affb28 EFLAGS: 00010046
[60313.522684] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffb559c0affb2c
[60313.522687] RDX: ffffb559c0affb2c RSI: 0000000000000000 RDI: 0000000000000000
[60313.522690] RBP: 0000000000000000 R08: 0000000000000000 R09:
0000000000000000
[60313.522692] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000002
[60313.522694] R13: ffffb559c0affc28 R14: 00000000c0affc01 R15: 0000000000000000
[60313.522696] FS: 0000000000000000(0000) GS:ffff8cf44ef00000(0000) knlGS:
0000000000000000
[60313.522698] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[60313.522700] CR2: 0000000000000120 CR3: 000000013ebce000 CR4:
0000000000350ee0
[60313.522702] Call Trace:
[60313.522707] kfence_handle_page_fault+0xa6/0x280
[60313.522710] page_fault_oops+0x9d/0x2d0
[60313.522714] exc_page_fault+0x78/0x180
[60313.522718] asm_exc_page_fault+0x1e/0x30
[60313.522721] RIP: 0010:bfq_dispatch_request+0x4c3/0x1280
[60313.522725] Code: 4c 89 e7 e8 ef da ff ff 4c 89 ff 89 c6 e8 75 64 00 00 4c 39
bb a0 00 00 00 0f 84 86 04 00 00 49 8b 84 24 90 00 00 00 48 8b 33 <ff> 80 20 01
00 00 48 89 34 24 48 8b 46 08 4c 8b 58 08 4c 89 5c 24
[60313.522727] RSP: 0018:ffffb559c0affcd0 EFLAGS: 00010046
[60313.522729] RAX: 0000000000000000 RBX: ffff8ced4d6a1000 RCX: 0000000000000000
[60313.522731] RDX: 0000000000000000 RSI: ffff8ced4ad90000 RDI: ffff8ced52fc9f40
[60313.522733] RBP: 0000000000000000 R08: 0000000000000001 R09:
0000000000000000
[60313.522735] R10: 000000000000003f R11: 0000000000000000 R12: ffff8cf20e5a5400
[60313.522737] R13: ffff8cf0e7e91c70 R14: ffff8ced4d6a1420 R15: ffff8cf0e7e91c70
[60313.522741] ? mod_delayed_work_on+0x71/0xe0
[60313.522745] ? __sbitmap_get_word+0x30/0x80
[60313.522748] __blk_mq_do_dispatch_sched+0x218/0x320
[60313.522752] __blk_mq_sched_dispatch_requests+0x107/0x150
[60313.522755] blk_mq_sched_dispatch_requests+0x2f/0x60
[60313.522758] blk_mq_run_work_fn+0x43/0xc0
[60313.522761] process_one_work+0x24e/0x430
[60313.522765] worker_thread+0x54/0x4d0
[60313.522767] ? process_one_work+0x430/0x430
[60313.522770] kthread+0x182/0x1b0
[60313.522773] ? __kthread_init_worker+0x50/0x50
[60313.522776] ret_from_fork+0x22/0x30
[60313.522781] ---[ end trace 55ef262e614b59af ]---
[60313.522786] ------------[ cut here ]------------
[60313.522787] WARNING: CPU: 20 PID: 388 at mm/kfence/core.c:135
kfence_handle_page_fault+0xaa/0x280
[60313.522791] Modules linked in: sctp ip6_udp_tunnel udp_tunnel uinput
netconsole blocklayoutdriver rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver
nfs lockd grace sunrpc fscache netfs rfcomm nft_ct nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 cmac algif_hash algif_skcipher nf_tables af_alg bnep tun
nfnetlink nls_iso8859_1 intel_rapl_msr vfat intel_rapl_common iwlmvm fat
mac80211 edac_mce_amd libarc4 btusb eeepc_wmi btrtl asus_wmi iwlwifi btbcm
snd_usb_audio sparse_keymap kvm_amd video wmi_bmof mxm_wmi btintel uvcvideo
snd_hda_codec_realtek videobuf2_vmalloc videobuf2_memops snd_usbmidi_lib kvm
snd_hda_codec_generic bluetooth videobuf2_v4l2 ledtrig_audio
snd_hda_codec_hdmi joydev snd_rawmidi ecdh_generic irqbypass ecc snd_hda_intel
mousedev pl2303 cfg80211 snd_seq_device videobuf2_common crc16 rapl k10temp
snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec igb r8169 sp5100_tco
snd_hda_core realtek i2c_piix4 ipmi_devintf dca snd_hwdep mdio_devres rfkill
snd_pcm libphy ipmi_msghandler wmi
[60313.522817] pinctrl_amd mac_hid acpi_cpufreq tcp_bbr2 vhost_vsock
vmw_vsock_virtio_transport_common vhost vhost_iotlb vsock v4l2loopback
videodev mc snd_hrtimer snd_timer snd soundcore nct6775 hwmon_vid crypto_user
fuse ip_tables x_tables xfs dm_thin_pool dm_persistent_data dm_bio_prison
dm_bufio libcrc32c crc32c_generic dm_crypt cbc encrypted_keys trusted
asn1_encoder tee hid_logitech_hidpp hid_logitech_dj usbhid dm_mod
crct10dif_pclmul crc32_pclmul crc32c_intel raid10 ghash_clmulni_intel
aesni_intel md_mod crypto_simd cryptd amdgpu ccp xhci_pci xhci_pci_renesas
tpm_crb tpm_tis tpm_tis_core tpm rng_core drm_ttm_helper ttm gpu_sched
i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec
drm agpgart
[60313.522840] CPU: 20 PID: 388 Comm: kworker/20:1H Tainted: G W
5.13.0-pf2 #1
[60313.522843] Hardware name: ASUS System Product Name/Pro WS X570-ACE, BIOS
3601 05/26/2021
[60313.522845] Workqueue: kblockd blk_mq_run_work_fn
[60313.522848] RIP: 0010:kfence_handle_page_fault+0xaa/0x280
[60313.522851] Code: 0f 86 d4 00 00 00 0f b6 f3 41 b8 03 00 00 00 31 c9 4c 89
ea 48 89 ef e8 e4 05 00 00 31 f6 4c 89 ff e8 6a f5 ff ff 84 c0 75 8d <0f> 0b c6
05 7d fd 6b 01 00 45 31 f6 e9 7c ff ff ff 48 8b 0d 36 a0
[60313.522853] RSP: 0018:ffffb559c0affb50 EFLAGS: 00010046
[60313.522855] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffb559c0affb2c
[60313.522857] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[60313.522859] RBP: 0000000000000120 R08: 0000000000000000 R09:
0000000000000000
[60313.522860] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000002
[60313.522862] R13: ffffb559c0affc28 R14: 00000000c0affc01 R15: 0000000000000000
[60313.522864] FS: 0000000000000000(0000) GS:ffff8cf44ef00000(0000) knlGS:
0000000000000000
[60313.522866] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[60313.522868] CR2: 0000000000000120 CR3: 000000013ebce000 CR4:
0000000000350ee0
[60313.522870] Call Trace:
[60313.522872] page_fault_oops+0x9d/0x2d0
[60313.522875] exc_page_fault+0x78/0x180
[60313.522878] asm_exc_page_fault+0x1e/0x30
[60313.522880] RIP: 0010:bfq_dispatch_request+0x4c3/0x1280
[60313.522883] Code: 4c 89 e7 e8 ef da ff ff 4c 89 ff 89 c6 e8 75 64 00 00 4c 39
bb a0 00 00 00 0f 84 86 04 00 00 49 8b 84 24 90 00 00 00 48 8b 33 <ff> 80 20 01
00 00 48 89 34 24 48 8b 46 08 4c 8b 58 08 4c 89 5c 24
[60313.522885] RSP: 0018:ffffb559c0affcd0 EFLAGS: 00010046
[60313.522887] RAX: 0000000000000000 RBX: ffff8ced4d6a1000 RCX: 0000000000000000
[60313.522889] RDX: 0000000000000000 RSI: ffff8ced4ad90000 RDI: ffff8ced52fc9f40
[60313.522890] RBP: 0000000000000000 R08: 0000000000000001 R09:
0000000000000000
[60313.522892] R10: 000000000000003f R11: 0000000000000000 R12: ffff8cf20e5a5400
[60313.523148] R13: ffff8cf0e7e91c70 R14: ffff8ced4d6a1420 R15: ffff8cf0e7e91c70
[60313.523150] ? mod_delayed_work_on+0x71/0xe0
[60313.523153] ? __sbitmap_get_word+0x30/0x80
[60313.523157] __blk_mq_do_dispatch_sched+0x218/0x320
[60313.523161] __blk_mq_sched_dispatch_requests+0x107/0x150
[60313.523165] blk_mq_sched_dispatch_requests+0x2f/0x60
[60313.523167] blk_mq_run_work_fn+0x43/0xc0
[60313.523170] process_one_work+0x24e/0x430
[60313.523173] worker_thread+0x54/0x4d0
[60313.523176] ? process_one_work+0x430/0x430
[60313.523178] kthread+0x182/0x1b0
[60313.523181] ? __kthread_init_worker+0x50/0x50
[60313.523183] ret_from_fork+0x22/0x30
[60313.523187] ---[ end trace 55ef262e614b59b0 ]---
[60313.523189] BUG: kernel NULL pointer dereference, address: 0000000000000120
[60313.523191] #PF: supervisor write access in kernel mode
[60313.523193] #PF: error_code(0x0002) - not-present page
[60313.523195] PGD 0 P4D 0
[60313.523197] Oops: 0002 [#1] PREEMPT SMP NOPTI
[60313.523200] CPU: 20 PID: 388 Comm: kworker/20:1H Tainted: G W
5.13.0-pf2 #1
[60313.523202] Hardware name: ASUS System Product Name/Pro WS X570-ACE, BIOS
3601 05/26/2021
[60313.523204] Workqueue: kblockd blk_mq_run_work_fn
[60313.523207] RIP: 0010:bfq_dispatch_request+0x4c3/0x1280
[60313.523210] Code: 4c 89 e7 e8 ef da ff ff 4c 89 ff 89 c6 e8 75 64 00 00 4c 39
bb a0 00 00 00 0f 84 86 04 00 00 49 8b 84 24 90 00 00 00 48 8b 33 <ff> 80 20 01
00 00 48 89 34 24 48 8b 46 08 4c 8b 58 08 4c 89 5c 24
[60313.523213] RSP: 0018:ffffb559c0affcd0 EFLAGS: 00010046
[60313.523215] RAX: 0000000000000000 RBX: ffff8ced4d6a1000 RCX: 0000000000000000
[60313.523216] RDX: 0000000000000000 RSI: ffff8ced4ad90000 RDI: ffff8ced52fc9f40
[60313.523218] RBP: 0000000000000000 R08: 0000000000000001 R09:
0000000000000000
[60313.523220] R10: 000000000000003f R11: 0000000000000000 R12: ffff8cf20e5a5400
[60313.523221] R13: ffff8cf0e7e91c70 R14: ffff8ced4d6a1420 R15: ffff8cf0e7e91c70
[60313.523223] FS: 0000000000000000(0000) GS:ffff8cf44ef00000(0000) knlGS:
0000000000000000
[60313.523225] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[60313.523227] CR2: 0000000000000120 CR3: 000000013ebce000 CR4:
0000000000350ee0
[60313.523229] Call Trace:
[60313.523231] ? mod_delayed_work_on+0x71/0xe0
[60313.523233] ? __sbitmap_get_word+0x30/0x80
[60313.523237] __blk_mq_do_dispatch_sched+0x218/0x320
[60313.523240] __blk_mq_sched_dispatch_requests+0x107/0x150
[60313.523243] blk_mq_sched_dispatch_requests+0x2f/0x60
[60313.523246] blk_mq_run_work_fn+0x43/0xc0
[60313.523249] process_one_work+0x24e/0x430
[60313.523251] worker_thread+0x54/0x4d0
[60313.523254] ? process_one_work+0x430/0x430
[60313.523257] kthread+0x182/0x1b0
[60313.523259] ? __kthread_init_worker+0x50/0x50
[60313.523261] ret_from_fork+0x22/0x30
[60313.523265] Modules linked in: sctp ip6_udp_tunnel udp_tunnel uinput
netconsole blocklayoutdriver rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver
nfs lockd grace sunrpc fscache netfs rfcomm nft_ct nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 cmac algif_hash algif_skcipher nf_tables af_alg bnep tun
nfnetlink nls_iso8859_1 intel_rapl_msr vfat intel_rapl_common iwlmvm fat
mac80211 edac_mce_amd libarc4 btusb eeepc_wmi btrtl asus_wmi iwlwifi btbcm
snd_usb_audio sparse_keymap kvm_amd video wmi_bmof mxm_wmi btintel uvcvideo
snd_hda_codec_realtek videobuf2_vmalloc videobuf2_memops snd_usbmidi_lib kvm
snd_hda_codec_generic bluetooth videobuf2_v4l2 ledtrig_audio
snd_hda_codec_hdmi joydev snd_rawmidi ecdh_generic irqbypass ecc snd_hda_intel
mousedev pl2303 cfg80211 snd_seq_device videobuf2_common crc16 rapl k10temp
snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec igb r8169 sp5100_tco
snd_hda_core realtek i2c_piix4 ipmi_devintf dca snd_hwdep mdio_devres rfkill
snd_pcm libphy ipmi_msghandler wmi
[60313.523290] pinctrl_amd mac_hid acpi_cpufreq tcp_bbr2 vhost_vsock
vmw_vsock_virtio_transport_common vhost vhost_iotlb vsock v4l2loopback
videodev mc snd_hrtimer snd_timer snd soundcore nct6775 hwmon_vid crypto_user
fuse ip_tables x_tables xfs dm_thin_pool dm_persistent_data dm_bio_prison
dm_bufio libcrc32c crc32c_generic dm_crypt cbc encrypted_keys trusted
asn1_encoder tee hid_logitech_hidpp hid_logitech_dj usbhid dm_mod
crct10dif_pclmul crc32_pclmul crc32c_intel raid10 ghash_clmulni_intel
aesni_intel md_mod crypto_simd cryptd amdgpu ccp xhci_pci xhci_pci_renesas
tpm_crb tpm_tis tpm_tis_core tpm rng_core drm_ttm_helper ttm gpu_sched
i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec
drm agpgart
[60313.523314] CR2: 0000000000000120
[60313.523316] ---[ end trace 55ef262e614b59b1 ]---
[60313.523318] RIP: 0010:bfq_dispatch_request+0x4c3/0x1280
[60313.523321] Code: 4c 89 e7 e8 ef da ff ff 4c 89 ff 89 c6 e8 75 64 00 00 4c 39
bb a0 00 00 00 0f 84 86 04 00 00 49 8b 84 24 90 00 00 00 48 8b 33 <ff> 80 20 01
00 00 48 89 34 24 48 8b 46 08 4c 8b 58 08 4c 89 5c 24
[60313.523323] RSP: 0018:ffffb559c0affcd0 EFLAGS: 00010046
[60313.523325] RAX: 0000000000000000 RBX: ffff8ced4d6a1000 RCX: 0000000000000000
[60313.523326] RDX: 0000000000000000 RSI: ffff8ced4ad90000 RDI: ffff8ced52fc9f40
[60313.523328] RBP: 0000000000000000 R08: 0000000000000001 R09:
0000000000000000
[60313.523330] R10: 000000000000003f R11: 0000000000000000 R12: ffff8cf20e5a5400
[60313.523332] R13: ffff8cf0e7e91c70 R14: ffff8ced4d6a1420 R15: ffff8cf0e7e91c70
[60313.523334] FS: 0000000000000000(0000) GS:ffff8cf44ef00000(0000) knlGS:
0000000000000000
[60313.523336] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[60313.523338] CR2: 0000000000000120 CR3: 000000013ebce000 CR4:
0000000000350ee0
[60313.523339] note: kworker/20:1H[388] exited with preempt_count 1
```

--
Oleksandr Natalenko (post-factum)


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