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Subjectnext-20220616 - repeated crashes in zap_pmd_range
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I've had multiple crashes with the same kernel stack trace on my x86_64
laptop.. There doesn't seem to be any matching reports in my linux-kernel mail
folder or where Google can find them.

[142037.910871][T92126] ------------[ cut here ]------------
[142037.990897][T92126] kernel BUG at include/linux/swapops.h:378!
[142038.070921][T92126] invalid opcode: 0000 [#1] PREEMPT SMP
[142038.150973][T92126] CPU: 0 PID: 92126 Comm: gnome-mahjongg Tainted: G W T 5.19.0-rc2-next-20220616-dirt
y #41 cda14773dff3831fc10ae1073ec183115d31a4be
[142038.230998][T92126] Hardware name: TOSHIBA Satellite C55-B/ZBWAA, BIOS 5.00 07/23/2015
[142038.311018][T92126] RIP: 0010:zap_pte_range+0xb71/0xba0
[142038.391046][T92126] Code: ff e9 74 fb ff ff 48 8d 49 ff e9 4c fb ff ff 49 8b 56 10 49 8b 76 08 e8 ad dc 04 00 e9 6d
fc ff ff 4c 8d 41 ff e9 6c fb ff ff <0f> 0b 48 8d 49 ff e9 f3 fa ff ff e8 af 37 d4 00 48 83 e2 f7 e9 20
[142038.471068][T92126] RSP: 0018:ffffaeca836d3a70 EFLAGS: 00010246
[142038.631101][T92126] RAX: 0000000000000000 RBX: 0000563818dc4000 RCX: 0000000000000000
[142038.711121][T92126] RDX: efffffffdca33600 RSI: efffffffdca33600 RDI: ffffe37b046b9900
[142038.791142][T92126] RBP: ffffaeca836d3b00 R08: ffffe37b046b9900 R09: 000000003b13b0a2
[142038.871162][T92126] R10: 000000009127bdcc R11: 0000000000000000 R12: ffffaeca836d3c18
[142038.951182][T92126] R13: ffff88914584be18 R14: eff0000000000600 R15: ffffaeca836d3ce0
[142039.031202][T92126] FS: 00007f2b5492b200(0000) GS:ffff889276a00000(0000) knlGS:0000000000000000
[142039.111223][T92126] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[142039.191243][T92126] CR2: 0000563818de0000 CR3: 0000000110dfa000 CR4: 00000000001006f0
[142039.271263][T92126] Call Trace:
[142039.351283][T92126] <TASK>
[142039.431309][T92126] zap_pmd_range.isra.0+0x136/0x320
[142039.511337][T92126] unmap_page_range+0x18a/0x2f0
[142039.591362][T92126] ? debug_smp_processor_id+0x1b/0x20
[142039.671389][T92126] unmap_single_vma+0x5c/0x100
[142039.751499][T92126] ? __this_cpu_preempt_check+0x17/0x20
[142039.831525][T92126] unmap_vmas+0x147/0x1e0
[142039.911548][T92126] ? unmap_vmas+0x4/0x1e0
[142039.991579][T92126] unmap_region+0x10e/0x170
[142040.071610][T92126] do_brk_munmap+0x2b8/0x370
[142040.151641][T92126] __do_sys_brk+0x2ec/0x3a0
[142040.231670][T92126] __x64_sys_brk+0x11/0x20
[142040.311693][T92126] do_syscall_64+0x3e/0x90
[142040.391718][T92126] entry_SYSCALL_64_after_hwframe+0x46/0xb0
[142040.471740][T92126] RIP: 0033:0x7f2b5592450b
[142040.551764][T92126] Code: ff ff 0f 1f 44 00 00 64 83 3b 0d 75 07 64 c7 03 01 00 00 00 5b b8 ff ff ff ff 5d 41 5c c3
90 f3 0f 1e fa b8 0c 00 00 00 0f 05 <48> 8b 15 3e 19 0d 00 48 89 02 48 39 f8 72 06 31 c0 c3 0f 1f 00 48
[142040.631785][T92126] RSP: 002b:00007ffe9ae558a8 EFLAGS: 00000206 ORIG_RAX: 000000000000000c
[142040.791817][T92126] RAX: ffffffffffffffda RBX: fffffffffffbb000 RCX: 00007f2b5592450b
[142040.871837][T92126] RDX: fffffffffffff000 RSI: 00007f2b559f6ce0 RDI: 0000563818dbd000
[142040.951856][T92126] RBP: 0000563818e02000 R08: 00007f2b559f74a0 R09: 00007f2b559f74a0
[142041.031876][T92126] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f2b559fe358
[142041.111895][T92126] R13: 0000000000000000 R14: 0000563818de1f50 R15: 00000000000200b0
[142041.191922][T92126] </TASK>
[142041.271941][T92126] Modules linked in: snd_hrtimer tls bnep ts_bm nft_limit xt_string xt_LOG nf_log_syslog nft_compa
t nf_tables sunrpc binfmt_misc ath3k btusb btrtl btbcm btintel bluetooth vfat fat ecdh_generic ecc intel_rapl_msr rtsx_p
ci_sdmmc intel_rapl_common intel_soc_dts_thermal intel_soc_dts_iosf intel_powerclamp crct10dif_pclmul crc32_pclmul crc32
c_intel polyval_generic ghash_clmulni_intel uas joydev cryptd ath9k serio_raw ath9k_common ath9k_hw rtsx_pci ath snd_hda
_codec_realtek snd_hda_codec_hdmi mei_txe toshiba_acpi fan industrialio toshiba_bluetooth rfkill_gpio pwm_lpss_platform
pwm_lpss bfq fuse
[142045.672581][T92126] Unloaded tainted modules: polyval_clmulni():1 polyval_clmulni():1 pcc_cpufreq():1 pcc_cpufreq():
1 pcc_cpufreq():1 pcc_cpufreq():1

I've hit it with different processes running:

[15382.259484][ T8349] CPU: 0 PID: 8349 Comm: dump Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be
[43146.815168][T36124] CPU: 1 PID: 36124 Comm: dump Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be
[32328.505512][T42933] CPU: 0 PID: 42933 Comm: dump Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be
[127563.538386][T23585] CPU: 1 PID: 23585 Comm: skypeforlinux Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be
[142038.150973][T92126] CPU: 0 PID: 92126 Comm: gnome-mahjongg Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be
[ 1407.334003][ T1539] CPU: 1 PID: 1539 Comm: festival Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be
[15800.570510][T19449] CPU: 0 PID: 19449 Comm: gcr-prompter Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be
[394327.263409][ T29] CPU: 0 PID: 29 Comm: khungtaskd Tainted: G W T 5.19.0-rc2-next-20220616-dirty #41 cda14773dff3831fc10ae1073ec183115d31a4be

(On the bright side, it did motivate me to fix my system backup script to be
restartable so if it died on the last filesystem, it wouldn't re-backup all the
others :)

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