# XFS로 인한 커널 오OPS / CPU 스톨
**URL:** https://meta.discourse.org/t/kernel-oops-cpu-stalls-due-to-xfs/272530
**Category:** Self-hosting
**Tags:** server-resources
**Created:** [7월 23, 2023, 12:55오전 UTC](https://meta.discourse.org/t/kernel-oops-cpu-stalls-due-to-xfs/272530 "2023-07-23T00:55:56Z")
**Posts on this page:** 1
**Showing post:** 4
### Author:  [@rahim123](https://meta.discourse.org/u/rahim123)
#### Post date: [7월 23, 2023, 2:05오전 UTC](https://meta.discourse.org/t/kernel-oops-cpu-stalls-due-to-xfs/272530/4 "2023-07-23T02:05:42Z")
> [@pfaffman](#):
>
> > [@rahim123](#):
> >
> > 메모리를 할당할 수 없습니다
>
> 제 생각에는 이것이 문제인 것 같습니다.
>
> Postgres에는 더 많은 메모리가 필요합니다. 메모리 설정을 조정하고 RAM을 추가할 수 있지만, Postgres의 메모리 할당량을 변경해야 할 것 같습니다.
음. 나는 동의하는 편인데, 처음에 발생했던 커널 오류를 제외하고는요. 이 VM은 오늘 아침까지 7월 6일부터 단 한 번의 커널 오OPS도 없이 실행되고 있었습니다. 해당 순간의 전체 출력입니다. `page_fault_oops`, `handle_mm_fault`, `xfs_filemap_map_pages` 관련 내용을 주목해 주세요:
```plaintext
Jul 22 05:00:22 myvm kernel: BUG: kernel NULL pointer dereference, address: 0000000000000002
Jul 22 05:00:22 myvm kernel: #PF: supervisor read access in kernel mode
Jul 22 05:00:22 myvm kernel: #PF: error_code(0x0000) - not-present page
Jul 22 05:00:22 myvm kernel: Oops: 0000 [#1] PREEMPT SMP NOPTI
Jul 22 05:00:22 myvm kernel: CPU: 3 PID: 3235204 Comm: postmaster Not tainted 6.1.0-10-amd64 #1 Debian 6.1.37-1
Jul 22 05:00:22 myvm kernel: Hardware name: Hetzner vServer/Standard PC (Q35 + ICH9, 2009), BIOS 20171111 11/11/2017
Jul 22 05:00:22 myvm kernel: RIP: 0010:next_uptodate_page+0x45/0x1f0
Jul 22 05:00:22 myvm kernel: Code: 0f 84 2f 01 00 00 48 81 ff 06 04 00 00 0f 84 a3 00 00 00 48 81 ff 02 04 00 00 0f 84 26 01 00 00 40 f6 c7 01 0f 85 8c 00 00 00 <48> 8b 07 a8 01 0f 85 81 00 00 00 8b 47 34 85 c0 74 7a 8d 50 01 4c
Jul 22 05:00:22 myvm kernel: RSP: 0000:ffffc1ae8274bcc0 EFLAGS: 00010246
Jul 22 05:00:22 myvm kernel: RAX: 0000000000000002 RBX: ffffc1ae8274bd18 RCX: 000000000000005e
Jul 22 05:00:22 myvm kernel: RDX: ffffc1ae8274bd18 RSI: ffffa0210863d2b0 RDI: 0000000000000002
Jul 22 05:00:22 myvm kernel: RBP: ffffa0210863d2b0 R08: 000000000000005e R09: 000055fb22bbdfff
Jul 22 05:00:22 myvm kernel: R10: 000000000000004f R11: 0000000000000000 R12: 000000000000005e
Jul 22 05:00:22 myvm kernel: R13: ffffa02194ad6980 R14: ffffa0210863d2b0 R15: ffffa02118538f60
Jul 22 05:00:22 myvm kernel: FS: 00007f423625fa40(0000) GS:ffffa0226bf80000(0000) knlGS:0000000000000000
Jul 22 05:00:22 myvm kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 22 05:00:22 myvm kernel: CR2: 0000000000000002 CR3: 000000010d87e000 CR4: 0000000000350ee0
Jul 22 05:00:22 myvm kernel: Call Trace:
Jul 22 05:00:22 myvm kernel:
Jul 22 05:00:22 myvm kernel: ? __die_body.cold+0x1a/0x1f
Jul 22 05:00:22 myvm kernel: ? page_fault_oops+0xd2/0x2b0
Jul 22 05:00:22 myvm kernel: ? finish_task_switch.isra.0+0x9b/0x300
Jul 22 05:00:22 myvm kernel: ? exc_page_fault+0x70/0x170
Jul 22 05:00:22 myvm kernel: ? asm_exc_page_fault+0x22/0x30
Jul 22 05:00:22 myvm kernel: ? next_uptodate_page+0x45/0x1f0
Jul 22 05:00:22 myvm kernel: filemap_map_pages+0xb0/0x6e0
Jul 22 05:00:22 myvm kernel: xfs_filemap_map_pages+0x41/0x60 [xfs]
Jul 22 05:00:22 myvm kernel: do_fault+0x1a7/0x410
Jul 22 05:00:22 myvm kernel: __handle_mm_fault+0x660/0xfa0
Jul 22 05:00:22 myvm kernel: handle_mm_fault+0xdb/0x2d0
Jul 22 05:00:22 myvm kernel: do_user_addr_fault+0x19c/0x570
Jul 22 05:00:22 myvm kernel: exc_page_fault+0x70/0x170
Jul 22 05:00:22 myvm kernel: asm_exc_page_fault+0x22/0x30
Jul 22 05:00:22 myvm kernel: RIP: 0033:0x7f42398b32a6
Jul 22 05:00:22 myvm kernel: Code: c7 5d 41 5c e9 3b 3d 00 00 5a 31 c0 5d 41 5c c3 0f 1f 40 00 89 f1 89 f8 48 83 e1 3f 48 83 e0 3f 83 f9 30 77 3f 83 f8 30 77 3a <66> 0f 12 0f 66 0f 12 16 66 0f 16 4f 08 66 0f 16 56 08 66 0f ef c0
Jul 22 05:00:22 myvm kernel: RSP: 002b:00007ffc8a9aae68 EFLAGS: 00010287
Jul 22 05:00:22 myvm kernel: RAX: 0000000000000001 RBX: 000055fb22b39750 RCX: 0000000000000010
Jul 22 05:00:22 myvm kernel: RDX: 0000000000000000 RSI: 00007f41b1534550 RDI: 000055fb22b59d01
Jul 22 05:00:22 myvm kernel: RBP: 0000000000000009 R08: 0000000000000000 R09: 000055fb22b39750
Jul 22 05:00:22 myvm kernel: R10: 00007f41b1534550 R11: 000000000000002c R12: 00007f42398c3180
Jul 22 05:00:22 myvm kernel: R13: 0000000000000000 R14: 0000000000000009 R15: 00007f42398c3180
Jul 22 05:00:22 myvm kernel:
Jul 22 05:00:22 myvm kernel: Modules linked in: ipt_REJECT nf_reject_ipv4 xt_multiport xt_nat xt_tcpudp veth xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge stp llc lz4 lz4_compress zram zsmalloc overlay binfmt_misc intel_rapl_msr intel_rapl_common ghash_clmulni_intel sha512_ssse3 sha512_generic iTCO_wdt intel_pmc_bxt iTCO_vendor_support virtio_rng aesni_intel crypto_simd watchdog cryptd pcspkr rng_core virtio_gpu virtio_console virtio_balloon virtio_dma_buf drm_shmem_helper drm_kms_helper button evdev joydev serio_raw sg fuse dm_mod drm loop efi_pstore configfs qemu_fw_cfg ip_tables x_tables autofs4 xfs libcrc32c crc32c_generic hid_generic usbhid hid sr_mod cdrom sd_mod t10_pi ahci crc64_rocksoft crc64 crc_t10dif libahci crct10dif_generic virtio_net net_failover virtio_scsi failover libata xhci_pci scsi_mod psmouse xhci_hcd crct10dif_pclmul crct10dif_common
Jul 22 05:00:22 myvm kernel: crc32_pclmul crc32c_intel i2c_i801 i2c_smbus lpc_ich scsi_common usbcore virtio_pci virtio_pci_legacy_dev virtio_pci_modern_dev virtio usb_common virtio_ring
Jul 22 05:00:22 myvm kernel: CR2: 0000000000000002
Jul 22 05:00:22 myvm kernel: ---[end trace 0000000000000000]---
Jul 22 05:00:22 myvm kernel: RIP: 0010:next_uptodate_page+0x45/0x1f0
Jul 22 05:00:22 myvm kernel: Code: 0f 84 2f 01 00 00 48 81 ff 06 04 00 00 0f 84 a3 00 00 00 48 81 ff 02 04 00 00 0f 84 26 01 00 00 40 f6 c7 01 0f 85 8c 00 00 00 <48> 8b 07 a8 01 0f 85 81 00 00 00 8b 47 34 85 c0 74 7a 8d 50 01 4c
Jul 22 05:00:22 myvm kernel: RSP: 0000:ffffc1ae8274bcc0 EFLAGS: 00010246
Jul 22 05:00:22 myvm kernel: RAX: 0000000000000002 RBX: ffffc1ae8274bd18 RCX: 000000000000005e
Jul 22 05:00:22 myvm kernel: RDX: ffffc1ae8274bd18 RSI: ffffa0210863d2b0 RDI: 0000000000000002
Jul 22 05:00:22 myvm kernel: RBP: ffffa0210863d2b0 R08: 000000000000005e R09: 000055fb22bbdfff
Jul 22 05:00:22 myvm kernel: R10: 000000000000004f R11: 0000000000000000 R12: 000000000000005e
Jul 22 05:00:22 myvm kernel: R13: ffffa02194ad6980 R14: ffffa0210863d2b0 R15: ffffa02118538f60
Jul 22 05:00:22 myvm kernel: FS: 00007f423625fa40(0000) GS:ffffa0226bf80000(0000) knlGS:0000000000000000
Jul 22 05:00:22 myvm kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 22 05:00:22 myvm kernel: CR2: 0000000000000002 CR3: 000000010d87e000 CR4: 0000000000350ee0
Jul 22 05:00:22 myvm kernel: ------------[cut here]------------
Jul 22 05:00:22 myvm kernel: Voluntary context switch within RCU read-side critical section!
Jul 22 05:00:22 myvm kernel: WARNING: CPU: 3 PID: 3235204 at kernel/rcu/tree_plugin.h:318 rcu_note_context_switch+0x4ee/0x690
Jul 22 05:00:22 myvm kernel: Modules linked in: ipt_REJECT nf_reject_ipv4 xt_multiport xt_nat xt_tcpudp veth xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge stp llc lz4 lz4_compress zram zsmalloc overlay binfmt_misc intel_rapl_msr intel_rapl_common ghash_clmulni_intel sha512_ssse3 sha512_generic iTCO_wdt intel_pmc_bxt iTCO_vendor_support virtio_rng aesni_intel crypto_simd watchdog cryptd pcspkr rng_core virtio_gpu virtio_console virtio_balloon virtio_dma_buf drm_shmem_helper drm_kms_helper button evdev joydev serio_raw sg fuse dm_mod drm loop efi_pstore configfs qemu_fw_cfg ip_tables x_tables autofs4 xfs libcrc32c crc32c_generic hid_generic usbhid hid sr_mod cdrom sd_mod t10_pi ahci crc64_rocksoft crc64 crc_t10dif libahci crct10dif_generic virtio_net net_failover virtio_scsi failover libata xhci_pci scsi_mod psmouse xhci_hcd crct10dif_pclmul crct10dif_common
Jul 22 05:00:22 myvm kernel: crc32_pclmul crc32c_intel i2c_i801 i2c_smbus lpc_ich scsi_common usbcore virtio_pci virtio_pci_legacy_dev virtio_pci_modern_dev virtio usb_common virtio_ring
Jul 22 05:00:22 myvm kernel: CPU: 3 PID: 3235204 Comm: postmaster Tainted: G D 6.1.0-10-amd64 #1 Debian 6.1.37-1
Jul 22 05:00:22 myvm kernel: Hardware name: Hetzner vServer/Standard PC (Q35 + ICH9, 2009), BIOS 20171111 11/11/2017
Jul 22 05:00:22 myvm kernel: RIP: 0010:rcu_note_context_switch+0x4ee/0x690
Jul 22 05:00:22 myvm kernel: Code: 49 89 3f 49 83 bc 24 98 00 00 00 00 0f 85 66 fe ff ff e9 58 fe ff ff 48 c7 c7 68 53 70 94 c6 05 d7 0e ad 01 01 e8 d2 8e f6 ff <0f> 0b e9 70 fb ff ff a9 ff ff ff 7f 0f 84 2c fc ff ff 65 48 8b 3c
Jul 22 05:00:22 myvm kernel: RSP: 0018:ffffc1ae8274bc60 EFLAGS: 00010086
Jul 22 05:00:22 myvm kernel: RAX: 0000000000000000 RBX: ffffa0226bfb1c00 RCX: 0000000000000000
Jul 22 05:00:22 myvm kernel: RDX: 0000000000000003 RSI: ffffffff9474105e RDI: 00000000ffffffff
Jul 22 05:00:22 myvm kernel: RBP: 0000000000000000 R08: 0000000000000000 R09: ffffc1ae8274bad0
Jul 22 05:00:22 myvm kernel: R10: 0000000000000003 R11: ffffffff94ed43a8 R12: 0000000000030e40
Jul 22 05:00:22 myvm kernel: R13: ffffa02175d09980 R14: ffffc1ae8274bd50 R15: 0000000000000000
Jul 22 05:00:22 myvm kernel: FS: 0000000000000000(0000) GS:ffffa0226bf80000(0000) knlGS:0000000000000000
Jul 22 05:00:22 myvm kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 22 05:00:22 myvm kernel: CR2: 00007f41ef6dd70e CR3: 00000000059f6000 CR4: 0000000000350ee0
Jul 22 05:00:22 myvm kernel: Call Trace:
Jul 22 05:00:22 myvm kernel:
Jul 22 05:00:22 myvm kernel: ? __warn+0x7d/0xc0
Jul 22 05:00:22 myvm kernel: ? rcu_note_context_switch+0x4ee/0x690
Jul 22 05:00:22 myvm kernel: ? report_bug+0xe6/0x170
Jul 22 05:00:22 myvm kernel: ? irq_work_queue+0xa/0x50
Jul 22 05:00:22 myvm kernel: ? handle_bug+0x41/0x70
Jul 22 05:00:22 myvm kernel: ? exc_invalid_op+0x13/0x60
Jul 22 05:00:22 myvm kernel: ? asm_exc_invalid_op+0x16/0x20
Jul 22 05:00:22 myvm kernel: ? rcu_note_context_switch+0x4ee/0x690
Jul 22 05:00:22 myvm kernel: __schedule+0xac/0xa20
Jul 22 05:00:22 myvm kernel: schedule+0x5d/0xe0
Jul 22 05:00:22 myvm kernel: rwsem_down_write_slowpath+0x34e/0x730
Jul 22 05:00:22 myvm kernel: exit_mmap+0xf6/0x2f0
Jul 22 05:00:22 myvm kernel: __mmput+0x3e/0x130
Jul 22 05:00:22 myvm kernel: do_exit+0x2fc/0xb10
Jul 22 05:00:22 myvm kernel: make_task_dead+0x8d/0x90
Jul 22 05:00:22 myvm kernel: rewind_stack_and_make_dead+0x17/0x20
Jul 22 05:00:22 myvm kernel: RIP: 0033:0x7f42398b32a6
Jul 22 05:00:22 myvm kernel: Code: Unable to access opcode bytes at 0x7f42398b327c.
Jul 22 05:00:22 myvm kernel: RSP: 002b:00007ffc8a9aae68 EFLAGS: 00010287
Jul 22 05:00:22 myvm kernel: RAX: 0000000000000001 RBX: 000055fb22b39750 RCX: 0000000000000010
Jul 22 05:00:22 myvm kernel: RDX: 0000000000000000 RSI: 00007f41b1534550 RDI: 000055fb22b59d01
Jul 22 05:00:22 myvm kernel: RBP: 0000000000000009 R08: 0000000000000000 R09: 000055fb22b39750
Jul 22 05:00:22 myvm kernel: R10: 00007f41b1534550 R11: 000000000000002c R12: 00007f42398c3180
Jul 22 05:00:22 myvm kernel: R13: 0000000000000000 R14: 0000000000000009 R15: 00007f42398c3180
Jul 22 05:00:22 myvm kernel:
Jul 22 05:00:22 myvm kernel: ---[end trace 0000000000000000]---
```
> [@supermathie](#):
>
> Hetzner 서버가 ECC RAM을 사용합니까?
>
> 여기서 제 첫 번째 직감은 하드웨어 문제입니다…
저도 어느 정도 같은 생각을 하고 있습니다. 다만 이 문제는 다소 반복되는 성격을 띠고 있어, 완전히 무작위라고 보기에는 약간 부족합니다. Hetzner가 아마 ECC RAM을 사용하지 않을 것이라고 추측합니다. 그것이 아마도 그렇게 저렴한 가격에 많은 것을 제공할 수 있는 이유일 것입니다. 심지어 그들의 전용 서버조차도 [보도에 따르면](https://news.ycombinator.com/item?id=4063929) ECC를 갖추지 않았거나 갖추지 않은 것으로 보입니다. 하지만 그렇다고 하더라도 Hetzner는 인프라 측면에서 일반적으로 매우 신뢰할 수 있다고 평가받고 있습니다.
> [@Hetzner experiences](https://meta.discourse.org/t/hetzner-experiences/54430):
>
> Time to test a new hosting company slight_smile .This time I opted for German Hetzner, and their 4.80€ VPS CX1. Note that this price is VAT inclusive, so it is one of the very cheapest on the market (many providers present VAT 0% prices) for a consumer. It’s a [solid package](https://www.hetzner.de/pt/hosting/produkte_vserver/cx10): 1GB RAM 1 Core CPU 25GB SSD 1 snapshot included in the price (paid extra option at OVH and many others) DDoS protection and the usual goodies I was going to benchmark this and move one instance there right away, but th…
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_[View the full topic](https://meta.discourse.org/t/kernel-oops-cpu-stalls-due-to-xfs/272530)._