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Groups > linux.debian.kernel > #68805

Bug#977048: linux-image-4.19.0-13-amd64: Kernel oops in unmount ...chroot.../sys/firmware/efi/efivar

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Hi,

On Thu, Dec 10, 2020 at 05:04:22PM +0100, Klaus Singvogel wrote:
> Package: src:linux
> Version: 4.19.160-2
> Severity: important
> 
> Dear Maintainer,
> 
> *** Reporter, please consider answering these questions, where appropriate ***
> 
>    * What led up to the situation?
> 
>      sudo mount -rbind /sys /${CHROOT}/sys
> 
>    * What exactly did you do (or not do) that was effective (or ineffective)?
> 
>      sudo umount /${CHROOT}/sys/firmware/efi/efivar
> 
>    * What was the outcome of this action?
> 
>      Segmentation fault and Kernel oops
> 
>    * What outcome did you expect instead?
> 
>      No segmentation fault, no Kernel oops
> 
> Note:
> This bug can be reproduced on further machines with this kernel version.
> 
> Here is the output of the oops:
> 
> [133082.213609] ------------[ cut here ]------------
> [133082.213610] kernel BUG at mm/slub.c:3950!
> [133082.213615] invalid opcode: 0000 [#1] SMP PTI
> [133082.213617] CPU: 5 PID: 11559 Comm: umount Tainted: G     U            4.19.0-13-amd64 #1 Debian 4.19.160-2
> [133082.213618] Hardware name: Micro-Star International Co., Ltd. MS-7B45/Z370 GAMING PRO CARBON (MS-7B45), BIOS A.B0 06/05/2020
> [133082.213621] RIP: 0010:kfree+0x168/0x180
> [133082.213622] Code: 5d 41 5c e9 fa 11 f9 ff 48 89 d9 48 89 da 41 b8 01 00 00 00 5b 4c 89 d6 5d 41 5c e9 02 f6 ff ff 0f 0b 49 8b 42 08 a8 01 75 c3 <0f> 0b 48 8b 3d ff 48 dd 00 e9 c7 fe ff ff 66 2e 0f 1f 84 00 00 00
> [133082.213623] RSP: 0018:ffffb71549543e58 EFLAGS: 00010246
> [133082.213624] RAX: 0000000000000000 RBX: ffff941ddae5c000 RCX: ffffffffa4ada018
> [133082.213625] RDX: 0000000000000000 RSI: 0000000000000296 RDI: 00006be600000000
> [133082.213626] RBP: ffffffffc08c1040 R08: ffffe66b51437208 R09: 0000000000000001
> [133082.213626] R10: ffffe66b516b9700 R11: ffffe66b51707008 R12: ffffffffc08bf742
> [133082.213627] R13: 0000000000000000 R14: 0000000000000000 R15: ffff941ddae5c000
> [133082.213628] FS:  00007f6337c2c080(0000) GS:ffff941ddeb40000(0000) knlGS:0000000000000000
> [133082.213629] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [133082.213630] CR2: 00007ffd34ee8cf8 CR3: 000000042a628006 CR4: 00000000003606e0
> [133082.213631] Call Trace:
> [133082.213635]  ? efivarfs_kill_sb+0x30/0x30 [efivarfs]
> [133082.213637]  efivarfs_destroy+0x22/0x30 [efivarfs]
> [133082.213639]  __efivar_entry_iter+0xd8/0x110
> [133082.213642]  deactivate_locked_super+0x2f/0x70
> [133082.213644]  cleanup_mnt+0x3f/0x70
> [133082.213646]  task_work_run+0x8a/0xb0
> [133082.213648]  exit_to_usermode_loop+0xeb/0xf0
> [133082.213650]  do_syscall_64+0x10d/0x110
> [133082.213652]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [133082.213653] RIP: 0033:0x7f6338052507
> [133082.213655] Code: 19 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 59 19 0c 00 f7 d8 64 89 01 48
> [133082.213655] RSP: 002b:00007ffd34eea528 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> [133082.213657] RAX: 0000000000000000 RBX: 0000563e3ae26ac0 RCX: 00007f6338052507
> [133082.213657] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000563e3ae26cd0
> [133082.213658] RBP: 0000000000000000 R08: 0000563e3ae27b40 R09: 00007f63380d3e80
> [133082.213659] R10: 0000000000000000 R11: 0000000000000246 R12: 0000563e3ae26cd0
> [133082.213659] R13: 00007f63381781c4 R14: 0000563e3ae26bb8 R15: 0000000000000000
> [133082.213661] Modules linked in: tcp_diag udp_diag raw_diag inet_diag unix_diag fuse rfkill uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common snd_usb_audio nls_ascii videodev nls_cp437 snd_usbmidi_lib vfat snd_rawmidi intel_rapl media snd_seq_device fat snd_hda_codec_hdmi x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_realtek kvm_intel snd_hda_codec_generic kvm irqbypass crct10dif_pclmul crc32_pclmul snd_hda_intel snd_hda_codec ghash_clmulni_intel intel_cstate efi_pstore snd_hda_core joydev sg intel_uncore snd_hwdep intel_rapl_perf snd_pcm iTCO_wdt snd_timer iTCO_vendor_support efivars snd pcspkr soundcore mei_me pcc_cpufreq mei acpi_pad acpi_tad evdev i2c_dev parport_pc sunrpc ppdev lp parport efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto
> [133082.213677]  ecb btrfs zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod hid_logitech_hidpp hid_logitech_dj hid_generic usbhid hid sr_mod cdrom sd_mod uas usb_storage crc32c_intel i915 ahci libahci i2c_algo_bit libata drm_kms_helper mxm_wmi scsi_mod xhci_pci xhci_hcd aesni_intel drm e1000e usbcore aes_x86_64 crypto_simd cryptd glue_helper i2c_i801 usb_common thermal fan wmi video button
> [133082.213691] ---[ end trace fdc6cf3f029628a7 ]---
> [133082.303757] RIP: 0010:kfree+0x168/0x180
> [133082.303775] Code: 5d 41 5c e9 fa 11 f9 ff 48 89 d9 48 89 da 41 b8 01 00 00 00 5b 4c 89 d6 5d 41 5c e9 02 f6 ff ff 0f 0b 49 8b 42 08 a8 01 75 c3 <0f> 0b 48 8b 3d ff 48 dd 00 e9 c7 fe ff ff 66 2e 0f 1f 84 00 00 00
> [133082.303776] RSP: 0018:ffffb71549543e58 EFLAGS: 00010246
> [133082.303776] RAX: 0000000000000000 RBX: ffff941ddae5c000 RCX: ffffffffa4ada018
> [133082.303777] RDX: 0000000000000000 RSI: 0000000000000296 RDI: 00006be600000000
> [133082.303778] RBP: ffffffffc08c1040 R08: ffffe66b51437208 R09: 0000000000000001
> [133082.303778] R10: ffffe66b516b9700 R11: ffffe66b51707008 R12: ffffffffc08bf742
> [133082.303779] R13: 0000000000000000 R14: 0000000000000000 R15: ffff941ddae5c000
> [133082.303780] FS:  00007f6337c2c080(0000) GS:ffff941ddeb40000(0000) knlGS:0000000000000000
> [133082.303781] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [133082.303781] CR2: 00007ffd34ee8cf8 CR3: 000000042a628006 CR4: 00000000003606e0

This should be
https://lore.kernel.org/lkml/5f31cde519b941308412b3849197ee7c@AcuMS.aculab.com/
and the commit was reverted in 4.19.161.

Can you check if applying the revert commit fixes the issue?

Regards,
Salvatore

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Bug#977048: linux-image-4.19.0-13-amd64: Kernel oops in unmount ...chroot.../sys/firmware/efi/efivar Klaus Singvogel <klaus@singvogel.net> - 2020-12-10 17:10 +0100
  Bug#977048: linux-image-4.19.0-13-amd64: Kernel oops in unmount ...chroot.../sys/firmware/efi/efivar Salvatore Bonaccorso <carnil@debian.org> - 2020-12-10 23:10 +0100
    Bug#977048: linux-image-4.19.0-13-amd64: Kernel oops in unmount ...chroot.../sys/firmware/efi/efivar Salvatore Bonaccorso <carnil@debian.org> - 2020-12-10 23:40 +0100

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