Re: BUG: kernel NULL pointer dereference, address: 0000000000000042

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[cc willy, linux-mm, as it crashed walking the page cache in the
generic fault code]

On Thu, Feb 09, 2023 at 10:43:10AM +0200, Avi Kivity wrote:
> Workload: compilation and running unit tests. The task that crashed is
> a unit test.
> 
> Kernel: 6.1.8-200.fc37.x86_64
> 
> Previously known stable on 5.8.9-200.fc32.x86_64. Two crashes seen so
> far.
> 
> 
> Feb  7 17:19:33 localhost kernel: BUG: kernel NULL pointer dereference,
> address: 0000000000000042
> Feb  7 17:19:33 localhost kernel: #PF: supervisor read access in kernel
> mode
> Feb  7 17:19:33 localhost kernel: #PF: error_code(0x0000) - not-present
> page
> Feb  7 17:19:33 localhost kernel: PGD 80000001cbb1f067 P4D
> 80000001cbb1f067 PUD 9cbb75067 PMD 0 
> Feb  7 17:19:33 localhost kernel: Oops: 0000 [#1] PREEMPT SMP PTI
> Feb  7 17:19:33 localhost kernel: CPU: 24 PID: 3718328 Comm:
> transport_test Tainted: G S                 6.1.8-200.fc37.x86_64 #1
> Feb  7 17:19:33 localhost kernel: Hardware name: Dell Inc. PowerEdge
> R730/0599V5, BIOS 2.9.1 12/04/2018
> Feb  7 17:19:33 localhost kernel: RIP:
> 0010:next_uptodate_page+0x46/0x200
> Feb  7 17:19:33 localhost kernel: Code: 0f 84 3f 01 00 00 48 81 ff 06
> 04 00 00 0f 84 b3 00 00 00 48 81 ff 02 04 00 00 0f 84 37 01 00 00 40 f6
> c7 01 0f 85 9c 00 00 00 <48> 8b 07 a8 01 0f 85 91 00 00 00 8b 47 34 85
> c0 0f 84 86 00 00 00
> Feb  7 17:19:33 localhost kernel: RSP: 0000:ffffa83e4ed67cc8 EFLAGS:
> 00010246
> Feb  7 17:19:33 localhost kernel: RAX: 0000000000000042 RBX:
> ffffa83e4ed67e00 RCX: 000000000000146e
> Feb  7 17:19:33 localhost kernel: RDX: ffffa83e4ed67d20 RSI:
> ffff94a9046316b0 RDI: 0000000000000042
> Feb  7 17:19:33 localhost kernel: RBP: ffffa83e4ed67d20 R08:
> 000000000000146e R09: 0000000000dfd000
> Feb  7 17:19:33 localhost kernel: R10: 000000000000145f R11:
> ffff94978b85960c R12: ffff94a9046316b0
> Feb  7 17:19:33 localhost kernel: R13: 000000000000146e R14:
> ffff94a9046316b0 R15: ffff948f8bb1f000
> Feb  7 17:19:33 localhost kernel: FS:  00007fd68fcb9d40(0000)
> GS:ffff949dffd00000(0000) knlGS:0000000000000000
> Feb  7 17:19:33 localhost kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
> 0000000080050033
> Feb  7 17:19:33 localhost kernel: CR2: 0000000000000042 CR3:
> 00000001dc1be005 CR4: 00000000001706e0
> Feb  7 17:19:33 localhost kernel: Call Trace:
> Feb  7 17:19:33 localhost kernel: <TASK>
> Feb  7 17:19:33 localhost kernel: filemap_map_pages+0x9f/0x7b0
> Feb  7 17:19:33 localhost kernel: xfs_filemap_map_pages+0x41/0x60 [xfs]
> Feb  7 17:19:33 localhost kernel: do_fault+0x1bf/0x430
> Feb  7 17:19:33 localhost kernel: __handle_mm_fault+0x63d/0xe40
> Feb  7 17:19:33 localhost kernel: ? do_sigaction+0x11a/0x240
> Feb  7 17:19:33 localhost kernel: handle_mm_fault+0xdb/0x2d0
> Feb  7 17:19:33 localhost kernel: do_user_addr_fault+0x1cd/0x690
> Feb  7 17:19:33 localhost kernel: exc_page_fault+0x70/0x170
> Feb  7 17:19:33 localhost kernel: asm_exc_page_fault+0x22/0x30
> Feb  7 17:19:33 localhost kernel: RIP: 0033:0x1666350
> Feb  7 17:19:33 localhost kernel: Code: Unable to access opcode bytes
> at 0x1666326.
> Feb  7 17:19:33 localhost kernel: RSP: 002b:00007ffde7fa86d8 EFLAGS:
> 00010212
> Feb  7 17:19:33 localhost kernel: RAX: 0000000000000000 RBX:
> 00007ffde7fa8748 RCX: 0000000002ed4468
> Feb  7 17:19:33 localhost kernel: RDX: 00006000000c4f50 RSI:
> 00007ffde7fa8748 RDI: 0000000000000012
> Feb  7 17:19:33 localhost kernel: RBP: 0000000000000012 R08:
> 0000000000000001 R09: 0000000002f46860
> Feb  7 17:19:33 localhost kernel: R10: 00007fd69219cac0 R11:
> 00007fd69224e670 R12: 0000000000000000
> Feb  7 17:19:33 localhost kernel: R13: 00006000000c4f50 R14:
> 0000000002ed4470 R15: 00007fd693be0000
> Feb  7 17:19:33 localhost kernel: </TASK>
> Feb  7 17:19:33 localhost kernel: Modules linked in: xsk_diag veth tls
> xt_conntrack xt_MASQUERADE nf_conntrack_netlink xt_addrtype nft_compat
> br_netfilter bridge stp llc intel_rapl_msr dell_wmi iTCO_wdt
> dell_smbios intel_pmc_bxt iTCO_vendor_support dell_wmi_descriptor
> ledtrig_audio sparse_keymap video dcdbas intel_rapl_common sb_edac
> x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ipmi_ssif
> irqbypass rapl intel_cstate intel_uncore ipmi_si ipmi_devintf
> ipmi_msghandler nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
> nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
> nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 rfkill
> overlay ip_set nf_tables nfnetlink qrtr acpi_power_meter mxm_wmi mei_me
> mei lpc_ich auth_rpcgss ip6_tables ip_tables sunrpc zram xfs
> crct10dif_pclmul crc32_pclmul nvme crc32c_intel polyval_clmulni
> polyval_generic ixgbe ghash_clmulni_intel nvme_core sha512_ssse3
> megaraid_sas tg3 mgag200 mdio nvme_common dca wmi scsi_dh_rdac
> scsi_dh_emc scsi_dh_alua
> Feb  7 17:19:33 localhost kernel: dm_multipath fuse
> Feb  7 17:19:33 localhost kernel: CR2: 0000000000000042
> Feb  7 17:19:33 localhost kernel: ---[ end trace 0000000000000000 ]---
> Feb  7 17:19:33 localhost kernel: RIP:
> 0010:next_uptodate_page+0x46/0x200
> Feb  7 17:19:33 localhost kernel: Code: 0f 84 3f 01 00 00 48 81 ff 06
> 04 00 00 0f 84 b3 00 00 00 48 81 ff 02 04 00 00 0f 84 37 01 00 00 40 f6
> c7 01 0f 85 9c 00 00 00 <48> 8b 07 a8 01 0f 85 91 00 00 00 8b 47 34 85
> c0 0f 84 86 00 00 00
> Feb  7 17:19:33 localhost kernel: RSP: 0000:ffffa83e4ed67cc8 EFLAGS:
> 00010246
> Feb  7 17:19:33 localhost kernel: RAX: 0000000000000042 RBX:
> ffffa83e4ed67e00 RCX: 000000000000146e
> Feb  7 17:19:33 localhost kernel: RDX: ffffa83e4ed67d20 RSI:
> ffff94a9046316b0 RDI: 0000000000000042
> Feb  7 17:19:33 localhost kernel: RBP: ffffa83e4ed67d20 R08:
> 000000000000146e R09: 0000000000dfd000
> Feb  7 17:19:33 localhost kernel: R10: 000000000000145f R11:
> ffff94978b85960c R12: ffff94a9046316b0
> Feb  7 17:19:33 localhost kernel: R13: 000000000000146e R14:
> ffff94a9046316b0 R15: ffff948f8bb1f000
> Feb  7 17:19:33 localhost kernel: FS:  00007fd68fcb9d40(0000)
> GS:ffff949dffd00000(0000) knlGS:0000000000000000
> 

-- 
Dave Chinner
david@xxxxxxxxxxxxx




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