[Bug 214917] New: 5.15: kernel BUG at fs/ext4/inode.c:1721!

[Bug 214917] New: 5.15: kernel BUG at fs/ext4/inode.c:1721!

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=214917

            Bug ID: 214917
           Summary: 5.15: kernel BUG at fs/ext4/inode.c:1721!
           Product: File System
           Version: 2.5
    Kernel Version: 5.15.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@kernel-bugs.osdl.org
          Reporter: gerbilsoft@gerbilsoft.com
        Regression: No

Since upgrading from 5.14.12 to 5.15, I've been getting a number of kernel BUGs
at fs/ext4/inode.c:1721!. I'm using inline_data on my ext4 file systems, and
this code path seems to be hit most often when using Google Chrome.

The BUG_ON() being hit was introduced by this commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=948ca5f30e1df0c11eb5b0f410b9ceb97fa77ad9

[  131.934142] ------------[ cut here ]------------
[  131.934148] kernel BUG at fs/ext4/inode.c:1721!
[  131.934155] invalid opcode: 0000 [#1] PREEMPT SMP PTI
[  131.934162] CPU: 2 PID: 6307 Comm: ThreadPoolForeg Tainted: G           O   
T 5.15.0-DEK-X230 #1
[  131.934167] Hardware name: LENOVO 2320HQU/2320HQU, BIOS G2ETB7WW (2.77 )
09/24/2019
[  131.934170] RIP: 0010:ext4_da_get_block_prep+0x422/0x460
[  131.934178] Code: ff f0 80 4b 01 01 e9 21 ff ff ff f0 80 0b 20 e9 0c ff ff
ff f0 80 0b 10 e9 de fe ff ff e8 36 89 fe ff 41 89 c4 e9 23 fe ff ff <0f> 0b 0f
0b 48 8b 7d 10 50 45 89 e1 48 c7 c1 30 10 d3 98 4c 8b 85
[  131.934182] RSP: 0018:ffffa9058ffafbb8 EFLAGS: 00010206
[  131.934185] RAX: 27ffffffffffffff RBX: ffffa0b6d40d3c98 RCX:
0000000000000000
[  131.934188] RDX: 0000000000000004 RSI: 0000000000000000 RDI:
0000000000000000
[  131.934191] RBP: ffffa0b6535fab00 R08: 0000000000000000 R09:
0000000000000000
[  131.934194] R10: 0000000000000000 R11: 0000000000001000 R12:
ffffa9058ffafc80
[  131.934197] R13: 0000000000000001 R14: ffffffffffff0000 R15:
ffffd265c7add0c0
[  131.934200] FS:  00007efc4ff3a640(0000) GS:ffffa0b8ce280000(0000)
knlGS:0000000000000000
[  131.934204] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  131.934207] CR2: 0000156a01674000 CR3: 000000016da9e003 CR4:
00000000001706e0
[  131.934210] Call Trace:
[  131.934215]  __block_write_begin_int+0x14e/0x590
[  131.934223]  ? ext4_da_release_space+0x100/0x100
[  131.934228]  ext4_da_write_begin+0x11d/0x2c0
[  131.934232]  ? generic_write_end+0xe3/0x150
[  131.934237]  generic_perform_write+0xc4/0x220
[  131.934258]  ext4_buffered_write_iter+0xa2/0x180
[  131.934266]  new_sync_write+0x156/0x200
[  131.934273]  vfs_write+0x216/0x2b0
[  131.934278]  __x64_sys_pwrite64+0x94/0xc0
[  131.934284]  do_syscall_64+0x66/0xa0
[  131.934291]  ? do_syscall_64+0xe/0xa0
[  131.934295]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[  131.934300] RIP: 0033:0x7efc57997217
[  131.934305] Code: 08 89 3c 24 48 89 4c 24 18 e8 05 bc f8 ff 4c 8b 54 24 18
41 89 c0 48 8b 54 24 10 b8 12 00 00 00 48 8b 74 24 08 8b 3c 24 0f 05 <48> 3d 00
f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 35 bc f8 ff 48 8b
[  131.934309] RSP: 002b:00007efc4ff38ff0 EFLAGS: 00000293 ORIG_RAX:
0000000000000012
[  131.934315] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00007efc57997217
[  131.934318] RDX: 0000000000001b20 RSI: 000026fc07ab5c00 RDI:
000000000000012e
[  131.934321] RBP: 00007efc4ff39100 R08: 0000000000000000 R09:
0000000000000000
[  131.934324] R10: 000000000000006f R11: 0000000000000293 R12:
0000000000001b20
[  131.934327] R13: 000000000000006f R14: 000026fc07ab5c00 R15:
000026fc0e84dac0
[  131.934332] Modules linked in: fuse snd_seq_dummy snd_hrtimer snd_seq
snd_seq_device bnep bluetooth ecdh_generic ecc lz4 lz4_compress zram zsmalloc
squashfs lz4_decompress algif_skcipher vhost_net tun vhost vhost_iotlb tap
vboxnetadp(O) vboxnetflt(O) vboxdrv(O) vhba(O) drivetemp iwlmvm
snd_hda_codec_hdmi mac80211 x86_pkg_temp_thermal coretemp libarc4 snd_ctl_led
kvm_intel iwlwifi snd_hda_codec_realtek at24 sdhci_pci kvm regmap_i2c uvcvideo
cqhci snd_hda_codec_generic cfg80211 irqbypass joydev videobuf2_vmalloc
ghash_clmulni_intel videobuf2_memops videobuf2_v4l2 sdhci i2c_i801
snd_hda_intel i2c_smbus videobuf2_common snd_intel_dspcfg lpc_ich mousedev
snd_hda_codec mmc_core videodev snd_hwdep snd_hda_core mc snd_pcm e1000e
snd_timer thinkpad_acpi tpm_tis ledtrig_audio platform_profile tpm_tis_core snd
tpm soundcore
[  131.934455] ---[ end trace 07f79dcd9bd2996e ]---

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[Bug 214917] 5.15: kernel BUG at fs/ext4/inode.c:1721!

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=214917

Eric Whitney (enwlinux@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |enwlinux@gmail.com

--- Comment #1 from Eric Whitney (enwlinux@gmail.com) ---
Thanks for your bug report.  A revert didn't make it into the upstream kernel,
so 5.15 contains code causing the OOPS you have observed.  You should be able
to
avoid this by reverting commit 948ca5f30e1df0c11eb5b0f410b9ceb97fa77ad9. 
Please
let us know if that doesn't work for you.  We'll be applying this revert as a
bug fix to 5.15 as soon as possible.

Thanks,
Eric

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