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From: Thorsten Leemhuis <regressions@leemhuis.info>
Subject: Bug 215605 - [5.14 regression] BUG: unable to handle page fault while
 running badblocks (fsck.ext4 -c) on a raid5 md array
To: Song Liu <song@kernel.org>, linux-raid@vger.kernel.org
Cc: Dominik Mierzejewski <dominik@greysector.net>,
 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
 "regressions@lists.linux.dev" <regressions@lists.linux.dev>
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Hi, this is your Linux kernel regression tracker.

I noticed a regression report in bugzilla.kernel.org that afaics nobody
acted upon since it was reported about a week ago, that's why I decided
to forward it to the lists and add a few relevant people to the CC. To
quote from https://bugzilla.kernel.org/show_bug.cgi?id=3D215605

>  Dominik Mierzejewski 2022-02-14 10:36:36 UTC
>=20
> Created attachment 300450 [details]
> kernel-5.16.8 dmesg with crash
>=20
> I'm experiencing kernel crash when running badblocks (fsck.ext4 -c) on =
a raid5 md array in my Intel Atom-based NAS box (Thecus N5550):
> [  720.911993] kernel: BUG: unable to handle page fault for address: ff=
ffdbc681023bc8
> [  720.912073] kernel: #PF: supervisor read access in kernel mode
> [  720.912120] kernel: #PF: error_code(0x0000) - not-present page
> [  720.912166] kernel: PGD 11ffc6067 P4D 11ffc6067 PUD 0=20
> [  720.912213] kernel: Oops: 0000 [#1] PREEMPT SMP NOPTI
> [  720.912256] kernel: CPU: 1 PID: 1406 Comm: badblocks Not tainted 5.1=
6.8-200.fc35.x86_64 #1
> [  720.912321] kernel: Hardware name: Intel Corporation Milstead Platfo=
rm/Granite Well, BIOS CDV W Series 05 08/27/2015
> [  720.912400] kernel: RIP: 0010:kfree+0x58/0x3e0
> [  720.912449] kernel: Code: 80 4c 01 e5 0f 82 84 03 00 00 48 c7 c0 00 =
00 00 80 48 2b 05 4a 96 3b 01 48 01 c5 48 c1 ed 0c 48 c1 e5 06 48 03 2d 2=
8 96 3b 01 <48> 8b 45 08 48 8d 50 ff a8 01 48 0f 45 ea 4
> 8 8b 55 08 48 8d 42 ff
> [  720.912598] kernel: RSP: 0018:ffff9db4008efaf8 EFLAGS: 00010286
> [  720.912648] kernel: RAX: 00006d7bc0000000 RBX: ffff9284c5214800 RCX:=
 ffff9284c3758ff8
> [  720.912708] kernel: RDX: ffff9283c1102740 RSI: ffffffffc07af091 RDI:=
 ffff9db4008efd58
> [  720.912767] kernel: RBP: ffffdbc681023bc0 R08: ffff9db4008efb88 R09:=
 ffff9284c3759000
> [  720.912826] kernel: R10: 0000000000000028 R11: ffff9284c213db48 R12:=
 ffff9db4008efd58
> [  720.912885] kernel: R13: ffff9284c213da00 R14: ffff9284c375f000 R15:=
 ffff9db4008efd58
> [  720.912945] kernel: FS:  00007f73e6669740(0000) GS:ffff9284dbc80000(=
0000) knlGS:0000000000000000
> [  720.913012] kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003=
3
> [  720.913062] kernel: CR2: ffffdbc681023bc8 CR3: 000000005c2cc000 CR4:=
 00000000000006e0
> [  720.913122] kernel: Call Trace:
> [  720.913150] kernel:  <TASK>
> [  720.913179] kernel:  raid5_make_request+0xb31/0xb90 [raid456]
> [  720.913247] kernel:  ? do_wait_intr_irq+0xa0/0xa0
> [  720.913292] kernel:  ? __blk_queue_split+0x30a/0x470
> [  720.913339] kernel:  md_handle_request+0x119/0x180
> [  720.913386] kernel:  md_submit_bio+0x67/0xa0
> [  720.913425] kernel:  __submit_bio_fops+0x91/0x160
> [  720.913468] kernel:  submit_bio_noacct+0xd7/0x2c0
> [  720.913510] kernel:  __blkdev_direct_IO_simple+0x198/0x290
> [  720.913576] kernel:  ? __fpu_restore_sig+0x193/0x570
> [  720.913623] kernel:  ? sysvec_apic_timer_interrupt+0xaf/0xd0
> [  720.913676] kernel:  ? __blkdev_direct_IO_simple+0x290/0x290
> [  720.913728] kernel:  generic_file_read_iter+0x9b/0x160
> [  720.913775] kernel:  new_sync_read+0x105/0x180
> [  720.913820] kernel:  vfs_read+0xf1/0x190
> [  720.913858] kernel:  ksys_read+0x4f/0xc0
> [  720.913896] kernel:  do_syscall_64+0x38/0x90
> [  720.913936] kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xae
> [  720.913985] kernel: RIP: 0033:0x7f73e676d772
> [  720.914024] kernel: Code: c0 e9 b2 fe ff ff 50 48 8d 3d da 2e 0c 00 =
e8 b5 f9 01 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 7=
5 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 =
54 24
> [  720.914166] kernel: RSP: 002b:00007fff1b8fcbb8 EFLAGS: 00000246 ORIG=
_RAX: 0000000000000000
> [  720.914231] kernel: RAX: ffffffffffffffda RBX: 0000000000000040 RCX:=
 00007f73e676d772
> [  720.917149] kernel: RDX: 0000000000040000 RSI: 00007f73e65d3000 RDI:=
 0000000000000004
> [  720.920078] kernel: RBP: 0000000000001000 R08: 00000000015105c0 R09:=
 0000000000000080
> [  720.922980] kernel: R10: 00007fff1b8fca00 R11: 0000000000000246 R12:=
 00000015105c0000
> [  720.925875] kernel: R13: 0000000000000004 R14: 00007f73e65d3000 R15:=
 0000000000040000
> [  720.928795] kernel:  </TASK>
> [  720.931704] kernel: Modules linked in: sctp ip6_udp_tunnel udp_tunne=
l rpcrdma rdma_cm iw_cm ib_cm ib_core sit tunnel4 ip_tunnel rfkill ipt_RE=
JECT nf_reject_ipv4 iptable_filter xt_nat iptable_nat nf_nat iptable_mang=
le nf_conntrack_pptp xt_CT iptable_raw xt_multiport xt_set ip6t_REJECT nf=
_reject_ipv6 xt_LOG nf_log_syslog xt_limit xt_state xt_conntrack nf_connt=
rack nf_defrag_ipv6 nf_defrag_ipv4 ip6table_filter ip6_tables ip_set_hash=
_netport ip_set_hash_net ip_set drivetemp it87 nfnetlink hwmon_vid vfat f=
at iTCO_wdt intel_pmc_bxt iTCO_vendor_support at24 raid456 async_raid6_re=
cov async_memcpy async_pq async_xor async_tx intel_powerclamp raid1 coret=
emp snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_cod=
ec_hdmi snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec s=
nd_hda_core snd_usb_audio i2c_i801 gma500_gfx i2c_smbus snd_usbmidi_lib j=
oydev snd_hwdep snd_rawmidi snd_seq_device mc snd_pcm lpc_ich i2c_algo_bi=
t snd_timer drm_kms_helper snd cec soundcore nfsd auth_rpcgss
> [  720.931885] kernel:  nfs_acl lockd grace drm fuse sunrpc zram ip_tab=
les hid_logitech_hidpp serio_raw r8152 sata_sil24 video mii hid_jabra e10=
00e hid_logitech_dj
> [  720.952122] kernel: CR2: ffffdbc681023bc8
> [  720.955651] kernel: ---[ end trace de2c3d5b971ae71d ]---
> [  720.959186] kernel: RIP: 0010:kfree+0x58/0x3e0
> [  720.962723] kernel: Code: 80 4c 01 e5 0f 82 84 03 00 00 48 c7 c0 00 =
00 00 80 48 2b 05 4a 96 3b 01 48 01 c5 48 c1 ed 0c 48 c1 e5 06 48 03 2d 2=
8 96 3b 01 <48> 8b 45 08 48 8d 50 ff a8 01 48 0f 45 ea 48 8b 55 08 48 8d =
42 ff
> [  720.966472] kernel: RSP: 0018:ffff9db4008efaf8 EFLAGS: 00010286
> [  720.970238] kernel: RAX: 00006d7bc0000000 RBX: ffff9284c5214800 RCX:=
 ffff9284c3758ff8
> [  720.973993] kernel: RDX: ffff9283c1102740 RSI: ffffffffc07af091 RDI:=
 ffff9db4008efd58
> [  720.977723] kernel: RBP: ffffdbc681023bc0 R08: ffff9db4008efb88 R09:=
 ffff9284c3759000
> [  720.981464] kernel: R10: 0000000000000028 R11: ffff9284c213db48 R12:=
 ffff9db4008efd58
> [  720.985228] kernel: R13: ffff9284c213da00 R14: ffff9284c375f000 R15:=
 ffff9db4008efd58
> [  720.988995] kernel: FS:  00007f73e6669740(0000) GS:ffff9284dbc80000(=
0000) knlGS:0000000000000000
> [  720.992774] kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003=
3
> [  720.996535] kernel: CR2: ffffdbc681023bc8 CR3: 000000005c2cc000 CR4:=
 00000000000006e0
>=20
> There was a crash earlier which caused the array to become degraded, bu=
t I wasn't able to capture the backtrace due to journal corruption. After=
 resyncing the array I tried running fsck on the filesystem and it's caus=
ing a kernel crash each time.
>=20
> I've reproduced the crash with the following kernels:
> 5.16.8-200.fc35.x86_64
> 5.15.18-200.fc35.x86_64
> 5.14.10-300.fc35.x86_64
>=20
> It doesn't happen with 5.13 kernels. I've been running fsck.ext4 -c on =
the array for the last 10 hours without a crash. It found 27 read errors =
which it corrected.
>=20
> Steps to reproduce:
> 1. fsck.ext4 -c -v /dev/md126
> 2. crash
>=20
> The array was degraded as a result of a previous crash, but it recovere=
d itself with no errors reported. Obviously, there remained some read err=
ors which badblocks found and which the kernel tripped over.
>=20
> Crash with 5.14.10 looks different:
> Feb 13 17:55:06 kernel: general protection fault, probably for non-cano=
nical address 0xef6dfcf53c7d6fc3: 0000 [#1] SMP NOPTI
> Feb 13 17:55:06 kernel: CPU: 2 PID: 831 Comm: md126_raid5 Not tainted 5=
=2E14.10-300.fc35.x86_64 #1
> Feb 13 17:55:06 kernel: Hardware name: Intel Corporation Milstead Platf=
orm/Granite Well, BIOS CDV W Series 05 08/27/2015
> Feb 13 17:55:06 kernel: RIP: 0010:bio_endio+0x87/0x130
> Feb 13 17:55:06 kernel: Code: 02 00 48 8b 45 08 48 85 c0 74 09 0f b7 55=
 14 f6 c6 01 75 2f 48 81 7d 38 50 48 5e bb 75 38 0f b6 45 1a 48 8b 5d 40 =
84 c0 74 09 <80> 7b 1a 00 75 03 88 43 1a 48 89 ef 48 89 dd e8 d5 fe ff ff=
 e9 6a
> Feb 13 17:55:06 kernel: RSP: 0000:ffffa5bb80597b48 EFLAGS: 00010206
> Feb 13 17:55:06 kernel: RAX: 000000000000000a RBX: ef6dfcf53c7d6fa9 RCX=
: ffff92b840865b50
> Feb 13 17:55:06 kernel: RDX: 0000000000000082 RSI: ffff92b8497f46c0 RDI=
: ffff92b84881f180
> Feb 13 17:55:06 kernel: RBP: ffff92b8497f46c0 R08: 0000000000000001 R09=
: 0000000000000000
> Feb 13 17:55:06 kernel: R10: ffff92b74a722c01 R11: 0000000000000001 R12=
: 0000000000000000
> Feb 13 17:55:06 kernel: R13: 0000000000000000 R14: ffff92b74a722cd0 R15=
: ffff92b844748860
> Feb 13 17:55:06 kernel: FS:  0000000000000000(0000) GS:ffff92b85bd00000=
(0000) knlGS:0000000000000000
> Feb 13 17:55:06 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 00000000800500=
33
> Feb 13 17:55:06 kernel: CR2: 0000557d787a2028 CR3: 000000003c194000 CR4=
: 00000000000006e0
> Feb 13 17:55:06 kernel: Call Trace:
> Feb 13 17:55:06 kernel:  ops_complete_biofill+0x98/0xe0 [raid456]
> Feb 13 17:55:06 kernel:  async_trigger_callback+0x7d/0xc1 [async_tx]
> Feb 13 17:55:06 kernel:  raid_run_ops+0x98c/0x15b0 [raid456]
> Feb 13 17:55:06 kernel:  ? handle_stripe_clean_event+0x400/0x400 [raid4=
56]
> Feb 13 17:55:06 kernel:  handle_stripe+0xe91/0x1dc0 [raid456]
> Feb 13 17:55:06 kernel:  handle_active_stripes.constprop.0+0x390/0x560 =
[raid456]
> Feb 13 17:55:06 kernel:  raid5d+0x39d/0x5d0 [raid456]
> Feb 13 17:55:06 kernel:  ? prepare_to_wait_event+0x5d/0x170
> Feb 13 17:55:06 kernel:  md_thread+0x98/0x140
> Feb 13 17:55:06 kernel:  ? finish_wait+0x80/0x80
> Feb 13 17:55:06 kernel:  ? md_write_inc+0x50/0x50
> Feb 13 17:55:06 kernel:  kthread+0x124/0x150
> Feb 13 17:55:06 kernel:  ? set_kthread_struct+0x40/0x40
> Feb 13 17:55:06 kernel:  ret_from_fork+0x1f/0x30
> Feb 13 17:55:06 kernel: Modules linked in: rpcrdma rdma_cm iw_cm ib_cm =
ib_core rfkill ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables xt_s=
et ipt_REJECT nf_reject_ipv4 xt_LOG nf_log_syslog xt_limit xt_multiport x=
t_state xt_conntrack iptable_filter xt_nat iptable_nat nf_nat iptable_man=
gle nf_conntrack_pptp xt_CT nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip=
table_raw ip_set_hash_netport ip_set_hash_net ip_set drivetemp it87 nfnet=
link hwmon_vid vfat fat snd_hda_codec_realtek snd_hda_codec_generic ledtr=
ig_audio snd_hda_codec_hdmi iTCO_wdt snd_hda_intel intel_pmc_bxt snd_inte=
l_dspcfg iTCO_vendor_support raid456 snd_intel_sdw_acpi snd_hda_codec asy=
nc_raid6_recov at24 async_memcpy async_pq async_xor async_tx snd_hda_core=
 gma500_gfx snd_hwdep i2c_algo_bit drm_kms_helper snd_pcm intel_powerclam=
p i2c_i801 snd_timer coretemp i2c_smbus snd cec soundcore lpc_ich nfsd au=
th_rpcgss nfs_acl lockd drm grace fuse sunrpc ip_tables raid1 serio_raw v=
ideo sata_sil24 e1000e
> Feb 13 17:55:06 kernel: ---[ end trace 97447bed31e596e0 ]---
> Feb 13 17:55:06 kernel: RIP: 0010:bio_endio+0x87/0x130
> Feb 13 17:55:06 kernel: Code: 02 00 48 8b 45 08 48 85 c0 74 09 0f b7 55=
 14 f6 c6 01 75 2f 48 81 7d 38 50 48 5e bb 75 38 0f b6 45 1a 48 8b 5d 40 =
84 c0 74 09 <80> 7b 1a 00 75 03 88 43 1a 48 89 ef 48 89 dd e8 d5 fe ff ff=
 e9 6a
> Feb 13 17:55:06 kernel: RSP: 0000:ffffa5bb80597b48 EFLAGS: 00010206
> Feb 13 17:55:06 kernel: RAX: 000000000000000a RBX: ef6dfcf53c7d6fa9 RCX=
: ffff92b840865b50
> Feb 13 17:55:06 kernel: RDX: 0000000000000082 RSI: ffff92b8497f46c0 RDI=
: ffff92b84881f180
> Feb 13 17:55:06 kernel: RBP: ffff92b8497f46c0 R08: 0000000000000001 R09=
: 0000000000000000
> Feb 13 17:55:06 kernel: R10: ffff92b74a722c01 R11: 0000000000000001 R12=
: 0000000000000000
> Feb 13 17:55:06 kernel: R13: 0000000000000000 R14: ffff92b74a722cd0 R15=
: ffff92b844748860
> Feb 13 17:55:06 kernel: FS:  0000000000000000(0000) GS:ffff92b85bd00000=
(0000) knlGS:0000000000000000
> Feb 13 17:55:06 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 00000000800500=
33
> Feb 13 17:55:06 kernel: CR2: 0000557d787a2028 CR3: 000000003c194000 CR4=
: 00000000000006e0
> Feb 13 17:55:06 kernel: ------------[ cut here ]------------
> Feb 13 17:55:06 kernel: WARNING: CPU: 2 PID: 831 at kernel/exit.c:739 d=
o_exit+0x37/0xa90
> Feb 13 17:55:06 kernel: Modules linked in: rpcrdma rdma_cm iw_cm ib_cm =
ib_core rfkill ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables xt_s=
et ipt_REJECT nf_reject_ipv4 xt_LOG nf_log_syslog xt_limit xt_multiport x=
t_state xt_conntrack iptable_filter xt_nat iptable_nat nf_nat iptable_man=
gle nf_conntrack_pptp xt_CT nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip=
table_raw ip_set_hash_netport ip_set_hash_net ip_set drivetemp it87 nfnet=
link hwmon_vid vfat fat snd_hda_codec_realtek snd_hda_codec_generic ledtr=
ig_audio snd_hda_codec_hdmi iTCO_wdt snd_hda_intel intel_pmc_bxt snd_inte=
l_dspcfg iTCO_vendor_support raid456 snd_intel_sdw_acpi snd_hda_codec asy=
nc_raid6_recov at24 async_memcpy async_pq async_xor async_tx snd_hda_core=
 gma500_gfx snd_hwdep i2c_algo_bit drm_kms_helper snd_pcm intel_powerclam=
p i2c_i801 snd_timer coretemp i2c_smbus snd cec soundcore lpc_ich nfsd au=
th_rpcgss nfs_acl lockd drm grace fuse sunrpc ip_tables raid1 serio_raw v=
ideo sata_sil24 e1000e
> Feb 13 17:55:06 kernel: CPU: 2 PID: 831 Comm: md126_raid5 Tainted: G   =
   D           5.14.10-300.fc35.x86_64 #1
> Feb 13 17:55:06 kernel: Hardware name: Intel Corporation Milstead Platf=
orm/Granite Well, BIOS CDV W Series 05 08/27/2015
> Feb 13 17:55:06 kernel: RIP: 0010:do_exit+0x37/0xa90
> Feb 13 17:55:06 kernel: Code: 55 48 89 fd 53 65 48 8b 1c 25 c0 7b 01 00=
 48 83 ec 28 48 8b 83 a8 0c 00 00 48 85 c0 74 0e 48 8b 10 48 39 d0 0f 84 =
56 04 00 00 <0f> 0b 65 8b 0d a0 2c f3 44 89 c8 25 00 ff ff 00 89 44 24 0c=
 0f 85
> Feb 13 17:55:06 kernel: RSP: 0000:ffffa5bb80597ef8 EFLAGS: 00010212
> Feb 13 17:55:06 kernel: RAX: ffffa5bb80597e50 RBX: ffff92b8437d8000 RCX=
: 0000000000000000
> Feb 13 17:55:06 kernel: RDX: ffff92b844217548 RSI: ffff92b85bd18a00 RDI=
: 000000000000000b
> Feb 13 17:55:06 kernel: RBP: 000000000000000b R08: 0000000000000000 R09=
: ffffa5bb805977a0
> Feb 13 17:55:06 kernel: R10: ffffa5bb80597798 R11: ffffffffbcf47468 R12=
: 000000000000000b
> Feb 13 17:55:06 kernel: R13: 0000000000000000 R14: ffff92b8437d8000 R15=
: 0000000000000000
> Feb 13 17:55:06 kernel: FS:  0000000000000000(0000) GS:ffff92b85bd00000=
(0000) knlGS:0000000000000000
> Feb 13 17:55:06 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 00000000800500=
33
> Feb 13 17:55:06 kernel: CR2: 0000557d787a2028 CR3: 000000003c194000 CR4=
: 00000000000006e0
> Feb 13 17:55:06 kernel: Call Trace:
> Feb 13 17:55:06 kernel:  ? kthread+0x124/0x150
> Feb 13 17:55:06 kernel:  rewind_stack_do_exit+0x17/0x20
> Feb 13 17:55:06 kernel: RIP: 0000:0x0
> Feb 13 17:55:06 kernel: Code: Unable to access opcode bytes at RIP 0xff=
ffffffffffffd6.
> Feb 13 17:55:06 kernel: RSP: 0000:0000000000000000 EFLAGS: 00000000 ORI=
G_RAX: 0000000000000000
> Feb 13 17:55:06 kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX=
: 0000000000000000
> Feb 13 17:55:06 kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI=
: 0000000000000000
> Feb 13 17:55:06 kernel: RBP: 0000000000000000 R08: 0000000000000000 R09=
: 0000000000000000
> Feb 13 17:55:06 kernel: R10: 0000000000000000 R11: 0000000000000000 R12=
: 0000000000000000
> Feb 13 17:55:06 kernel: R13: 0000000000000000 R14: 0000000000000000 R15=
: 0000000000000000
> Feb 13 17:55:06 kernel: ---[ end trace 97447bed31e596e1 ]---
>=20
> Downstream bug report: https://bugzilla.redhat.com/show_bug.cgi?id=3D20=
53936 .

Could somebody take a look into this? Or was this discussed somewhere
else already? Or even fixed?

FWIW, I searched the list and wondered if these might be related, but I
was unable to tell for sure:

https://lore.kernel.org/all/164244747275.86917.2623783912687807916@richar=
div.omgwallhack.org/
https://lore.kernel.org/all/20211216145222.15370-4-mariusz.tkaczyk@linux.=
intel.com/

Anyway, to get this tracked:

#regzbot introduced: v5.13..v5.14.10
#regzbot from: Dominik Mierzejewski <dominik@greysector.net>
#regzbot title: md: unable to handle page fault while running badblocks
(fsck.ext4 -c) on a raid5 md array
#regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=3D215605

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I'm getting a lot of
reports on my table. I can only look briefly into most of them and lack
knowledge about most of the areas they concern. I thus unfortunately
will sometimes get things wrong or miss something important. I hope
that's not the case here; if you think it is, don't hesitate to tell me
in a public reply, it's in everyone's interest to set the public record
straight.

--=20
Additional information about regzbot:

If you want to know more about regzbot, check out its web-interface, the
getting start guide, and the references documentation:

https://linux-regtracking.leemhuis.info/regzbot/
https://gitlab.com/knurd42/regzbot/-/blob/main/docs/getting_started.md
https://gitlab.com/knurd42/regzbot/-/blob/main/docs/reference.md

The last two documents will explain how you can interact with regzbot
yourself if your want to.

Hint for reporters: when reporting a regression it's in your interest to
CC the regression list and tell regzbot about the issue, as that ensures
the regression makes it onto the radar of the Linux kernel's regression
tracker -- that's in your interest, as it ensures your report won't fall
through the cracks unnoticed.

Hint for developers: you normally don't need to care about regzbot once
it's involved. Fix the issue as you normally would, just remember to
include 'Link:' tag in the patch descriptions pointing to all reports
about the issue. This has been expected from developers even before
regzbot showed up for reasons explained in
'Documentation/process/submitting-patches.rst' and
'Documentation/process/5.Posting.rst'.