linux-kernel - Re: Oops (probably) unmounting /oldroot/firmware/efi/efivars.

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Date:   Tue, 24 Nov 2020 15:23:43 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     linux-efi <linux-efi@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        "matthew.garrett@...ula.com" <matthew.garrett@...ula.com>,
        "jk@...abs.org" <jk@...abs.org>
Subject: Re: Oops (probably) unmounting /oldroot/firmware/efi/efivars.

On Tue, 24 Nov 2020 at 15:22, David Laight <David.Laight@...lab.com> wrote:
>
> I've just updated to the head of Linus's tree (5.10-rc5) and got the following
> 'splat' during shutdown.
>
> Userspace is Ubuntu 20.04.
>
> rc4 rebooted fine.
>
> I'll try to bisect - but it isn't quick.
>

Surely caused by

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/efivarfs?id=fe5186cf12e30facfe261e9be6c7904a170bd822



>
> [   49.612436] kernel BUG at mm/slub.c:304!
> [   49.616407] invalid opcode: 0000 [#1] SMP PTI
> [   49.620806] CPU: 4 PID: 2044 Comm: (sd-umount) Not tainted 5.10.0-rc5+ #104
> [   49.627816] Hardware name: Supermicro A1SAi/A1SRi, BIOS 1.1a 08/27/2015
> [   49.634484] RIP: 0010:__slab_free+0x1c9/0x380
> [   49.638874] Code: 41 5e 41 5f 5d c3 41 f7 46 08 00 0d 21 00 0f 85 f0 fe ff ff 4d 85 ed 0f 85 e7 fe ff ff 80 4c 24 5b 80 45 31 c0 e9 2a ff ff ff <0f> 0b 49 3b 5c 24 28 75 97 4c 89 c0 41 89 f0 44 89 fe 49 89 4c 24
> [   49.659081] RSP: 0018:ffffa69740d17ce0 EFLAGS: 00010246
> [   49.665694] RAX: ffff98444d492800 RBX: 0000000000080005 RCX: ffff98444d492000
> [   49.674227] RDX: ffff98444d492000 RSI: fffff4a184352400 RDI: ffff984440043300
> [   49.682735] RBP: ffffa69740d17d78 R08: 0000000000000001 R09: ffffffffb8a66024
> [   49.691253] R10: ffff98444d492000 R11: 0000000000000001 R12: fffff4a184352400
> [   49.699753] R13: ffff98444d492000 R14: ffff984440043300 R15: ffff98444d492000
> [   49.708230] FS:  00007f353813d980(0000) GS:ffff9847afd00000(0000) knlGS:0000000000000000
> [   49.717695] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   49.724823] CR2: 00007f3538f2f760 CR3: 000000010f6dc000 CR4: 00000000001006e0
> [   49.733369] Call Trace:
> [   49.737236]  ? xas_store+0x59/0x630
> [   49.742141]  kfree+0x3af/0x400
> [   49.746609]  ? up+0x37/0x70
> [   49.750817]  ? efivarfs_destroy+0x24/0x30
> [   49.756220]  efivarfs_destroy+0x24/0x30
> [   49.761435]  ? efivarfs_kill_sb+0x30/0x30
> [   49.766811]  __efivar_entry_iter+0xed/0x130
> [   49.772355]  efivarfs_kill_sb+0x25/0x30
> [   49.777540]  deactivate_locked_super+0x3b/0x80
> [   49.783360]  deactivate_super+0x3e/0x50
> [   49.788554]  cleanup_mnt+0x109/0x160
> [   49.793471]  __cleanup_mnt+0x12/0x20
> [   49.798388]  task_work_run+0x70/0xb0
> [   49.803298]  exit_to_user_mode_prepare+0x14b/0x170
> [   49.809450]  syscall_exit_to_user_mode+0x2d/0x150
> [   49.815522]  do_syscall_64+0x45/0x90
> [   49.820471]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [   49.826912] RIP: 0033:0x7f3538ff32cb
> [   49.831880] Code: 8b 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 95 8b 0c 00 f7 d8 64 89 01 48
> [   49.853650] RSP: 002b:00007ffffcd5efc8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
> [   49.862792] RAX: 0000000000000000 RBX: 0000557eb1ea4c00 RCX: 00007f3538ff32cb
> [   49.871520] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000557eb1ea4c40
> [   49.880260] RBP: 0000000000000000 R08: 0000000000008000 R09: 00007ffffcd5e3c0
> [   49.889013] R10: 00007f353813d900 R11: 0000000000000206 R12: 0000000000000000
> [   49.897778] R13: 0000000000000000 R14: 0000000000000001 R15: 0000557eb1e9fb60
> [   49.906560] Modules linked in: nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua ipmi_ssif intel_powerclamp coretemp kvm_intel kvm joydev input_leds ipmi_si intel_cstate ipmi_devintf ipmi_msghandler mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 btrfs blake2b_generic zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx libcrc32c xor raid6_pq raid1 raid0 multipath linear ast drm_vram_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec drm_ttm_helper ttm drm gpio_ich ahci igb crct10dif_pclmul hid_generic crc32_pclmul i2c_i801 ghash_clmulni_intel aesni_intel libahci glue_helper crypto_simd i2c_ismt cryptd lpc_ich dca i2c_smbus usbhid i2c_algo_bit hid
> [   49.983763] ---[ end trace b39f2c043c8d157b ]---
>
> -
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