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SubjectRe: General protection fault with use_blk_mq=1.
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> Il giorno 29 mar 2018, alle ore 03:02, Jens Axboe <axboe@kernel.dk> ha scritto:
>
> On 3/28/18 5:03 PM, Zephaniah E. Loss-Cutler-Hull wrote:
>> I am not subscribed to any of the lists on the To list here, please CC
>> me on any replies.
>>
>> I am encountering a fairly consistent crash anywhere from 15 minutes to
>> 12 hours after boot with scsi_mod.use_blk_mq=1 dm_mod.use_blk_mq=1>
>> The crash looks like:
>>
>> [ 5466.075993] general protection fault: 0000 [#1] PREEMPT SMP PTI
>> [ 5466.075997] Modules linked in: esp4 xfrm4_mode_tunnel fuse usblp
>> uvcvideo pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O)
>> ip6table_filter ip6_tables xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4
>> xt_conntrack nf_conntrack iptable_filter ip_tables x_tables intel_rapl
>> joydev serio_raw wmi_bmof iwldvm iwlwifi shpchp kvm_intel kvm irqbypass
>> autofs4 algif_skcipher nls_iso8859_1 nls_cp437 crc32_pclmul
>> ghash_clmulni_intel
>> [ 5466.076022] CPU: 3 PID: 10573 Comm: pool Tainted: G O
>> 4.15.13-f1-dirty #148
>> [ 5466.076024] Hardware name: Hewlett-Packard HP EliteBook Folio
>> 9470m/18DF, BIOS 68IBD Ver. F.44 05/22/2013
>> [ 5466.076029] RIP: 0010:percpu_counter_add_batch+0x2b/0xb0
>> [ 5466.076031] RSP: 0018:ffffa556c47afb58 EFLAGS: 00010002
>> [ 5466.076033] RAX: ffff95cda87ce018 RBX: ffff95cda87cdb68 RCX:
>> 0000000000000000
>> [ 5466.076034] RDX: 000000003fffffff RSI: ffffffff896495c4 RDI:
>> ffffffff895b2bed
>> [ 5466.076036] RBP: 000000003fffffff R08: 0000000000000000 R09:
>> ffff95cb7d5f8148
>> [ 5466.076037] R10: 0000000000000200 R11: 0000000000000000 R12:
>> 0000000000000001
>> [ 5466.076038] R13: ffff95cda87ce088 R14: ffff95cda6ebd100 R15:
>> ffffa556c47afc58
>> [ 5466.076040] FS: 00007f25f5305700(0000) GS:ffff95cdbeac0000(0000)
>> knlGS:0000000000000000
>> [ 5466.076042] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 5466.076043] CR2: 00007f25e807e0a8 CR3: 00000003ed5a6001 CR4:
>> 00000000001606e0
>> [ 5466.076044] Call Trace:
>> [ 5466.076050] bfqg_stats_update_io_add+0x58/0x100
>> [ 5466.076055] bfq_insert_requests+0xec/0xd80
>> [ 5466.076059] ? blk_rq_append_bio+0x8f/0xa0
>> [ 5466.076061] ? blk_rq_map_user_iov+0xc3/0x1d0
>> [ 5466.076065] blk_mq_sched_insert_request+0xa3/0x130
>> [ 5466.076068] blk_execute_rq+0x3a/0x50
>> [ 5466.076070] sg_io+0x197/0x3e0
>> [ 5466.076073] ? dput+0xca/0x210
>> [ 5466.076077] ? mntput_no_expire+0x11/0x1a0
>> [ 5466.076079] scsi_cmd_ioctl+0x289/0x400
>> [ 5466.076082] ? filename_lookup+0xe1/0x170
>> [ 5466.076085] sd_ioctl+0xc7/0x1a0
>> [ 5466.076088] blkdev_ioctl+0x4d4/0x8c0
>> [ 5466.076091] block_ioctl+0x39/0x40
>> [ 5466.076094] do_vfs_ioctl+0x92/0x5e0
>> [ 5466.076097] ? __fget+0x73/0xc0
>> [ 5466.076099] SyS_ioctl+0x74/0x80
>> [ 5466.076102] do_syscall_64+0x60/0x110
>> [ 5466.076106] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>> [ 5466.076109] RIP: 0033:0x7f25f75fef47
>> [ 5466.076110] RSP: 002b:00007f25f53049a8 EFLAGS: 00000246 ORIG_RAX:
>> 0000000000000010
>> [ 5466.076112] RAX: ffffffffffffffda RBX: 000000000000000c RCX:
>> 00007f25f75fef47
>> [ 5466.076114] RDX: 00007f25f53049b0 RSI: 0000000000002285 RDI:
>> 000000000000000c
>> [ 5466.076115] RBP: 0000000000000010 R08: 00007f25e8007818 R09:
>> 0000000000000200
>> [ 5466.076116] R10: 0000000000000001 R11: 0000000000000246 R12:
>> 0000000000000000
>> [ 5466.076118] R13: 0000000000000000 R14: 00007f25f8a6b5e0 R15:
>> 00007f25e80173e0
>> [ 5466.076120] Code: 41 55 49 89 fd bf 01 00 00 00 41 54 49 89 f4 55 89
>> d5 53 e8 18 e1 bb ff 48 c7 c7 c4 95 64 89 e8 dc e9 fb ff 49 8b 45 20 48
>> 63 d5 <65> 8b 18 48 63 db 4c 01 e3 48 39 d3 7d 0a f7 dd 48 63 ed 48 39
>> [ 5466.076147] RIP: percpu_counter_add_batch+0x2b/0xb0 RSP: ffffa556c47afb58
>> [ 5466.076149] ---[ end trace 8d7eb80aafef4494 ]---
>> [ 5466.670153] note: pool[10573] exited with preempt_count 2
>>
>> (I only have the one instance right this minute as a result of not
>> having remote syslog setup before now.)
>>
>> This is clearly deep in the blk_mq code, and it goes away when I remove
>> the use_blk_mq kernel command line parameters.
>>
>> My next obvious step is to try and disable the load of the vbox modules.
>>
>> I can include the full dmesg output if it would be helpful.
>>
>> The system is an older HP Ultrabook, and the root partition is, sda1 (a
>> SSD) -> a LUKS encrypted partition -> LVM -> BTRFS.
>>
>> The kernel is a stock 4.15.11, however I only recently added the blk_mq
>> options, so while I can state that I have seen this on multiple kernels
>> in the 4.15.x series, I have not tested earlier kernels in this
>> configuration.
>>
>> Looking through the code, I'd guess that this is dying inside
>> blkg_rwstat_add, which calls percpu_counter_add_batch, which is what RIP
>> is pointing at.
>
> Leaving the whole thing here for Paolo - it's crashing off insertion of
> a request coming out of SG_IO. Don't think we've seen this BFQ failure
> case before.
>

Actually, we have. Found and reported by Ming about two months and a
half ago:
https://www.spinics.net/lists/linux-block/msg21422.html

Then it just disappeared with 4.16, and Ming moved on. This forced me
to abandon the problem, as I never succeeded in reproducing it.

Thanks,
Paolo

> You can mitigate this by switching the scsi-mq devices to mq-deadline
> instead.
>
> --
> Jens Axboe

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