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Message-Id: <D4LNG4ZHZM5X.1STBTSTM9LN6E@mbosch.me>
Date: Wed, 02 Oct 2024 23:48:13 +0200
From: "Maximilian Bosch" <maximilian@...sch.me>
To: "Linux regressions mailing list" <regressions@...ts.linux.dev>, "David
 Howells" <dhowells@...hat.com>
Cc: "LKML" <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
 "Christian Brauner" <brauner@...nel.org>
Subject: Re: [REGRESSION] 9pfs issues on 6.12-rc1

Good evening,

thanks a lot for the quick reply!

> A fix for it is already pending in the vfs.fixes branch and -next:
> https://lore.kernel.org/all/cbaf141ba6c0e2e209717d02746584072844841a.1727722269.git.osandov@fb.com/

I applied the patch on top of Linux 6.12-rc1 locally and I can confirm
that this resolves the issue, thanks!

With best regards

Maximilian


On Wed Oct 2, 2024 at 7:31 PM CEST, Linux regression tracking (Thorsten Leemhuis) wrote:
> Hi, Thorsten here, the Linux kernel's regression tracker. Top-posting
> for once, to make this easily accessible to everyone.
>
> Thx for the report. Not my area of expertise (so everyone: corrent me if
> I'm wrong), but I suspect your problem might be a duplicate of the
> following report, which was bisected to the same commit from dhowells
> (ee4cdf7ba857a8 ("netfs: Speed up buffered reading") [v6.12-rc1]):
> https://lore.kernel.org/all/20240923183432.1876750-1-chantr4@gmail.com/
>
> A fix for it is already pending in the vfs.fixes branch and -next:
> https://lore.kernel.org/all/cbaf141ba6c0e2e209717d02746584072844841a.1727722269.git.osandov@fb.com/
>
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> --
> Everything you wanna know about Linux kernel regression tracking:
> https://linux-regtracking.leemhuis.info/about/#tldr
> If I did something stupid, please tell me, as explained on that page.
>
> On 02.10.24 19:08, Maximilian Bosch wrote:
> > 
> > Starting with Linux 6.12-rc1 the automatic VM tests of NixOS don't boot
> > anymore and fail like this:
> > >     mounting nix-store on /nix/.ro-store...
> >     [    1.604781] 9p: Installing v9fs 9p2000 file system support
> >     mounting tmpfs on /nix/.rw-store...
> >     mounting overlay on /nix/store...
> >     mounting shared on /tmp/shared...
> >     mounting xchg on /tmp/xchg...
> >     switch_root: can't execute '/nix/store/zv87gw0yxfsslq0mcc35a99k54da9a4z-nixos-system-machine-test/init': Exec format error
> >     [    1.734997] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100
> >     [    1.736002] CPU: 0 UID: 0 PID: 1 Comm: switch_root Not tainted 6.12.0-rc1 #1-NixOS
> >     [    1.736965] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> >     [    1.738309] Call Trace:
> >     [    1.738698]  <TASK>
> >     [    1.739034]  panic+0x324/0x340
> >     [    1.739458]  do_exit+0x92e/0xa90
> >     [    1.739919]  ? count_memcg_events.constprop.0+0x1a/0x40
> >     [    1.740568]  ? srso_return_thunk+0x5/0x5f
> >     [    1.741095]  ? handle_mm_fault+0xb0/0x2e0
> >     [    1.741709]  do_group_exit+0x30/0x80
> >     [    1.742229]  __x64_sys_exit_group+0x18/0x20
> >     [    1.742800]  x64_sys_call+0x17f3/0x1800
> >     [    1.743326]  do_syscall_64+0xb7/0x210
> >     [    1.743895]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >     [    1.744530] RIP: 0033:0x7f8e1a7b9d1d
> >     [    1.745061] Code: 45 31 c0 45 31 d2 45 31 db c3 0f 1f 00 f3 0f 1e fa 48 8b 35 e5 e0 10 00 ba e7 00 00 00 eb 07 66 0f 1f 44 00 00 f4 89 d0 0f 05 <48> 3d 00 f0 ff ff 76 f3 f7 d8 64 89 06 eb ec 0f 1f 40 00 f3 0f 1e
> >     [    1.747263] RSP: 002b:00007ffcb56d63b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
> >     [    1.748250] RAX: ffffffffffffffda RBX: 00007f8e1a8c9fa8 RCX: 00007f8e1a7b9d1d
> >     [    1.749187] RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
> >     [    1.750050] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
> >     [    1.750891] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> >     [    1.751706] R13: 0000000000000001 R14: 00007f8e1a8c8680 R15: 00007f8e1a8c9fc0
> >     [    1.752583]  </TASK>
> >     [    1.753010] Kernel Offset: 0xb800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> > 
> > The failing script here is the initrd's /init when it tries to perform a
> > switch_root to `/sysroot`:
> > 
> >     exec env -i $(type -P switch_root) "$targetRoot" "$stage2Init"
> > 
> > Said "$stage2Init" file consistently gets a different hash when doing
> > `sha256sum` on it in the initrd script, but looks & behaves correct
> > on the host. I reproduced the test failures on 4 different build
> > machines and two architectures (x86_64-linux, aarch64-linux) now.
> > 
> > The "$stage2Init" script is a shell-script itself. When trying to
> > start the interpreter from its shebang inside the initrd (via
> > `$targetRoot/nix/store/...-bash-5.2p32/bin/bash`) and do the
> > switch_root I get a different error:
> > 
> >     + exec env -i /nix/store/akm69s5sngxyvqrzys326dss9rsrvbpy-extra-utils/bin/switch_root /mnt-root /nix/store/k3pm4iv44y7x7p74kky6cwxiswmr6kpi-nixos-system-machine-test/init
> >     [    1.912859] list_del corruption. prev->next should be ffffc5cf80be0248, but was ffffc5cf80bd9208. (prev=ffffc5cf80bb4d48)
> >     [    1.914237] ------------[ cut here ]------------
> >     [    1.915059] kernel BUG at lib/list_debug.c:62!
> >     [    1.915854] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
> >     [    1.916739] CPU: 0 UID: 0 PID: 17 Comm: ksoftirqd/0 Not tainted 6.12.0-rc1 #1-NixOS
> >     [    1.917837] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> >     [    1.919354] RIP: 0010:__list_del_entry_valid_or_report+0xb4/0xd0
> >     [    1.920180] Code: 0f 0b 48 89 fe 48 89 ca 48 c7 c7 38 52 41 9f e8 42 91 ac ff 90 0f 0b 48 89 fe 48 89 c2 48 c7 c7 70 52 41 9f e8 2d 91 ac ff 90 <0f> 0b 48 89 d1 48 c7 c7 c0 52 41 9f 48 89 f2 48 89 c6 e8 15 91 ac
> >     [    1.922636] RSP: 0018:ffff96f800093c00 EFLAGS: 00010046
> >     [    1.923563] RAX: 000000000000006d RBX: 0000000000000001 RCX: 0000000000000000
> >     [    1.924692] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> >     [    1.925664] RBP: 0000000000000341 R08: 0000000000000000 R09: 0000000000000000
> >     [    1.926646] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8fbebd83dc90
> >     [    1.927584] R13: ffffc5cf80be0240 R14: ffff8fbebd83dc80 R15: 000000000002f809
> >     [    1.928533] FS:  0000000000000000(0000) GS:ffff8fbebd800000(0000) knlGS:0000000000000000
> >     [    1.929647] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >     [    1.930431] CR2: 00007fed6f09b000 CR3: 0000000001e02000 CR4: 0000000000350ef0
> >     [    1.931333] Call Trace:
> >     [    1.931727]  <TASK>
> >     [    1.932088]  ? die+0x36/0x90
> >     [    1.932595]  ? do_trap+0xed/0x110
> >     [    1.933047]  ? __list_del_entry_valid_or_report+0xb4/0xd0
> >     [    1.933757]  ? do_error_trap+0x6a/0xa0
> >     [    1.934390]  ? __list_del_entry_valid_or_report+0xb4/0xd0
> >     [    1.935073]  ? exc_invalid_op+0x51/0x80
> >     [    1.935627]  ? __list_del_entry_valid_or_report+0xb4/0xd0
> >     [    1.936326]  ? asm_exc_invalid_op+0x1a/0x20
> >     [    1.936904]  ? __list_del_entry_valid_or_report+0xb4/0xd0
> >     [    1.937622]  free_pcppages_bulk+0x130/0x280
> >     [    1.938151]  free_unref_page_commit+0x21c/0x380
> >     [    1.938753]  free_unref_page+0x472/0x4f0
> >     [    1.939343]  __put_partials+0xee/0x130
> >     [    1.939921]  ? rcu_do_batch+0x1f2/0x800
> >     [    1.940471]  kmem_cache_free+0x2c3/0x370
> >     [    1.940990]  rcu_do_batch+0x1f2/0x800
> >     [    1.941508]  ? rcu_do_batch+0x180/0x800
> >     [    1.942031]  rcu_core+0x182/0x340
> >     [    1.942500]  handle_softirqs+0xe4/0x2f0
> >     [    1.943034]  run_ksoftirqd+0x33/0x40
> >     [    1.943522]  smpboot_thread_fn+0xdd/0x1d0
> >     [    1.944056]  ? __pfx_smpboot_thread_fn+0x10/0x10
> >     [    1.944679]  kthread+0xd0/0x100
> >     [    1.945126]  ? __pfx_kthread+0x10/0x10
> >     [    1.945656]  ret_from_fork+0x34/0x50
> >     [    1.946151]  ? __pfx_kthread+0x10/0x10
> >     [    1.946680]  ret_from_fork_asm+0x1a/0x30
> >     [    1.947269]  </TASK>
> >     [    1.947622] Modules linked in: overlay 9p ext4 crc32c_generic crc16 mbcache jbd2 hid_generic usbhid hid 9pnet_virtio 9pnet netfs sr_mod virtio_net cdrom virtio_blk net_failover atkbd failover libps2 vivaldi_fmap crc32c_intel ata_piix libata uhci_hcd scsi_mod ehci_hcd virtio_pci virtio_pci_legacy_dev virtio_pci_modern_dev scsi_common i8042 serio rtc_cmos dm_mod dax virtio_gpu virtio_dma_buf virtio_rng rng_core virtio_console virtio_balloon virtio virtio_ring
> >     [    1.952291] ---[ end trace 0000000000000000 ]---
> >     [    1.952893] RIP: 0010:__list_del_entry_valid_or_report+0xb4/0xd0
> >     [    1.953678] Code: 0f 0b 48 89 fe 48 89 ca 48 c7 c7 38 52 41 9f e8 42 91 ac ff 90 0f 0b 48 89 fe 48 89 c2 48 c7 c7 70 52 41 9f e8 2d 91 ac ff 90 <0f> 0b 48 89 d1 48 c7 c7 c0 52 41 9f 48 89 f2 48 89 c6 e8 15 91 ac
> >     [    1.955888] RSP: 0018:ffff96f800093c00 EFLAGS: 00010046
> >     [    1.956548] RAX: 000000000000006d RBX: 0000000000000001 RCX: 0000000000000000
> >     [    1.957436] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> >     [    1.958328] RBP: 0000000000000341 R08: 0000000000000000 R09: 0000000000000000
> >     [    1.959166] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8fbebd83dc90
> >     [    1.960044] R13: ffffc5cf80be0240 R14: ffff8fbebd83dc80 R15: 000000000002f809
> >     [    1.960905] FS:  0000000000000000(0000) GS:ffff8fbebd800000(0000) knlGS:0000000000000000
> >     [    1.961926] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >     [    1.962693] CR2: 00007fed6f09b000 CR3: 0000000001e02000 CR4: 0000000000350ef0
> >     [    1.963548] Kernel panic - not syncing: Fatal exception in interrupt
> >     [    1.964417] Kernel Offset: 0x1ce00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> > 
> > On a subsequent run to verify this, it failed earlier while reading
> > $targetRoot/.../bash like this:
> > 
> > 
> >     [    1.871810] BUG: Bad page state in process cat  pfn:2e74a
> >     [    1.872481] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x1e5 pfn:0x2e74a
> >     [    1.873499] flags: 0xffffc000000000(node=0|zone=1|lastcpupid=0x1ffff)
> >     [    1.874260] raw: 00ffffc000000000 dead000000000100 dead000000000122 0000000000000000
> >     [    1.875250] raw: 00000000000001e5 0000000000000000 00000001ffffffff 0000000000000000
> >     [    1.876295] page dumped because: nonzero _refcount
> >     [    1.876910] Modules linked in: overlay 9p ext4 crc32c_generic crc16 mbcache jbd2 hid_generic usbhid hid 9pnet_virtio 9pnet netfs sr_mod virtio_net cdrom virtio_blk net_failover atkbd failover libps2 vivaldi_fmap crc32c_intel ata_piix libata scsi_mod uhci_hcd ehci_hcd virtio_pci virtio_pci_legacy_dev virtio_pci_modern_dev scsi_common i8042 serio rtc_cmos dm_mod dax virtio_gpu virtio_dma_buf virtio_rng rng_core virtio_console virtio_balloon virtio virtio_ring
> >     [    1.881465] CPU: 0 UID: 0 PID: 315 Comm: cat Not tainted 6.12.0-rc1 #1-NixOS
> >     [    1.882326] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> >     [    1.883684] Call Trace:
> >     [    1.884103]  <TASK>
> >     [    1.884440]  dump_stack_lvl+0x64/0x90
> >     [    1.884954]  bad_page+0x70/0x110
> >     [    1.885468]  __rmqueue_pcplist+0x209/0xd00
> >     [    1.886029]  ? srso_return_thunk+0x5/0x5f
> >     [    1.886572]  ? pdu_read+0x36/0x50 [9pnet]
> >     [    1.887177]  get_page_from_freelist+0x2df/0x1910
> >     [    1.887788]  ? srso_return_thunk+0x5/0x5f
> >     [    1.888324]  ? enqueue_entity+0xce/0x510
> >     [    1.888881]  ? srso_return_thunk+0x5/0x5f
> >     [    1.889415]  ? pick_eevdf+0x76/0x1a0
> >     [    1.889970]  ? update_curr+0x35/0x270
> >     [    1.890476]  __alloc_pages_noprof+0x1a3/0x1150
> >     [    1.891158]  ? srso_return_thunk+0x5/0x5f
> >     [    1.891712]  ? __mod_memcg_lruvec_state+0xa9/0x160
> >     [    1.892346]  ? srso_return_thunk+0x5/0x5f
> >     [    1.892919]  ? __lruvec_stat_mod_folio+0x83/0xd0
> >     [    1.893521]  alloc_pages_mpol_noprof+0x8f/0x1f0
> >     [    1.894148]  folio_alloc_noprof+0x5b/0xb0
> >     [    1.894671]  page_cache_ra_unbounded+0x11f/0x200
> >     [    1.895270]  filemap_get_pages+0x538/0x6d0
> >     [    1.895813]  ? srso_return_thunk+0x5/0x5f
> >     [    1.896361]  filemap_splice_read+0x136/0x320
> >     [    1.896948]  backing_file_splice_read+0x52/0xa0
> >     [    1.897522]  ovl_splice_read+0xd2/0xf0 [overlay]
> >     [    1.898160]  ? __pfx_ovl_file_accessed+0x10/0x10 [overlay]
> >     [    1.898817]  splice_direct_to_actor+0xb4/0x270
> >     [    1.899404]  ? __pfx_direct_splice_actor+0x10/0x10
> >     [    1.900103]  do_splice_direct+0x77/0xd0
> >     [    1.900627]  ? __pfx_direct_file_splice_eof+0x10/0x10
> >     [    1.901308]  do_sendfile+0x359/0x410
> >     [    1.901788]  __x64_sys_sendfile64+0xb9/0xd0
> >     [    1.902370]  do_syscall_64+0xb7/0x210
> >     [    1.902904]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >     [    1.903604] RIP: 0033:0x7fa9f3a7289e
> >     [    1.904214] Code: 75 0e 00 f7 d8 64 89 02 b8 ff ff ff ff 31 d2 31 c9 31 ff 45 31 db c3 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 28 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 12 31 d2 31 c9 31 f6 31 ff 45 31 d2 45 31 db
> >     [    1.906436] RSP: 002b:00007ffe6a82bde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
> >     [    1.907400] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa9f3a7289e
> >     [    1.908241] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000001
> >     [    1.909184] RBP: 00007ffe6a82be50 R08: 0000000000000000 R09: 0000000000000000
> >     [    1.910212] R10: 0000000001000000 R11: 0000000000000246 R12: 0000000000000001
> >     [    1.911117] R13: 0000000001000000 R14: 0000000000000001 R15: 0000000000000000
> >     [    1.911998]  </TASK>
> >     [    1.912376] Disabling lock debugging due to kernel taint
> >     [    1.913479] list_del corruption. next->prev should be ffffc80e40b9d948, but was ffffc80e40b9d0c8. (next=ffffc80e40b9c7c8)
> >     [    1.914823] ------------[ cut here ]------------
> >     [    1.915408] kernel BUG at lib/list_debug.c:65!
> >     [    1.916050] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
> >     [    1.916785] CPU: 0 UID: 0 PID: 315 Comm: cat Tainted: G    B              6.12.0-rc1 #1-NixOS
> >     [    1.917877] Tainted: [B]=BAD_PAGE
> >     [    1.918350] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> >     [    1.919996] RIP: 0010:__list_del_entry_valid_or_report+0xcc/0xd0
> >     [    1.920903] Code: 89 fe 48 89 c2 48 c7 c7 70 52 41 ba e8 2d 91 ac ff 90 0f 0b 48 89 d1 48 c7 c7 c0 52 41 ba 48 89 f2 48 89 c6 e8 15 91 ac ff 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f
> >     [    1.923423] RSP: 0018:ffff9ed880187748 EFLAGS: 00010246
> >     [    1.924210] RAX: 000000000000006d RBX: ffff94db3d83dc80 RCX: 0000000000000000
> >     [    1.925147] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> >     [    1.926051] RBP: ffffc80e40b9d940 R08: 0000000000000000 R09: 0000000000000000
> >     [    1.926940] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
> >     [    1.927809] R13: ffff94db3d83dc80 R14: ffffc80e40b9d948 R15: ffff94db3ffd6180
> >     [    1.928695] FS:  00007fa9f396eb80(0000) GS:ffff94db3d800000(0000) knlGS:0000000000000000
> >     [    1.929728] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >     [    1.930540] CR2: 00000000004d1829 CR3: 0000000001dd2000 CR4: 0000000000350ef0
> >     [    1.931444] Call Trace:
> >     [    1.931916]  <TASK>
> >     [    1.932357]  ? die+0x36/0x90
> >     [    1.932831]  ? do_trap+0xed/0x110
> >     [    1.933385]  ? __list_del_entry_valid_or_report+0xcc/0xd0
> >     [    1.934073]  ? do_error_trap+0x6a/0xa0
> >     [    1.934583]  ? __list_del_entry_valid_or_report+0xcc/0xd0
> >     [    1.935242]  ? exc_invalid_op+0x51/0x80
> >     [    1.935781]  ? __list_del_entry_valid_or_report+0xcc/0xd0
> >     [    1.936484]  ? asm_exc_invalid_op+0x1a/0x20
> >     [    1.937174]  ? __list_del_entry_valid_or_report+0xcc/0xd0
> >     [    1.937926]  ? __list_del_entry_valid_or_report+0xcb/0xd0
> >     [    1.938685]  __rmqueue_pcplist+0xa5/0xd00
> >     [    1.939292]  ? srso_return_thunk+0x5/0x5f
> >     [    1.940004]  ? __mod_memcg_lruvec_state+0xa9/0x160
> >     [    1.940758]  ? srso_return_thunk+0x5/0x5f
> >     [    1.941417]  ? update_load_avg+0x7e/0x7f0
> >     [    1.942133]  ? srso_return_thunk+0x5/0x5f
> >     [    1.942838]  ? srso_return_thunk+0x5/0x5f
> >     [    1.943508]  get_page_from_freelist+0x2df/0x1910
> >     [    1.944143]  ? srso_return_thunk+0x5/0x5f
> >     [    1.944696]  ? check_preempt_wakeup_fair+0x1ee/0x240
> >     [    1.945335]  ? srso_return_thunk+0x5/0x5f
> >     [    1.945905]  __alloc_pages_noprof+0x1a3/0x1150
> >     [    1.946489]  ? __blk_flush_plug+0xf5/0x150
> >     [    1.947105]  ? srso_return_thunk+0x5/0x5f
> >     [    1.947629]  ? __dquot_alloc_space+0x2a8/0x3a0
> >     [    1.948404]  ? srso_return_thunk+0x5/0x5f
> >     [    1.949116]  ? __mod_memcg_lruvec_state+0xa9/0x160
> >     [    1.949888]  alloc_pages_mpol_noprof+0x8f/0x1f0
> >     [    1.950514]  folio_alloc_mpol_noprof+0x14/0x40
> >     [    1.951153]  shmem_alloc_folio+0xa7/0xd0
> >     [    1.951692]  ? shmem_recalc_inode+0x20/0x90
> >     [    1.952272]  shmem_alloc_and_add_folio+0x109/0x490
> >     [    1.952940]  ? filemap_get_entry+0x10f/0x1a0
> >     [    1.953570]  ? srso_return_thunk+0x5/0x5f
> >     [    1.954185]  shmem_get_folio_gfp+0x248/0x610
> >     [    1.954791]  shmem_write_begin+0x64/0x110
> >     [    1.955484]  generic_perform_write+0xdf/0x2a0
> >     [    1.956239]  shmem_file_write_iter+0x8a/0x90
> >     [    1.956882]  iter_file_splice_write+0x33f/0x580
> >     [    1.957577]  direct_splice_actor+0x54/0x140
> >     [    1.958178]  splice_direct_to_actor+0xec/0x270
> >     [    1.958813]  ? __pfx_direct_splice_actor+0x10/0x10
> >     [    1.959442]  do_splice_direct+0x77/0xd0
> >     [    1.960018]  ? __pfx_direct_file_splice_eof+0x10/0x10
> >     [    1.960726]  do_sendfile+0x359/0x410
> >     [    1.961248]  __x64_sys_sendfile64+0xb9/0xd0
> >     [    1.961905]  do_syscall_64+0xb7/0x210
> >     [    1.962467]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >     [    1.963211] RIP: 0033:0x7fa9f3a7289e
> >     [    1.963711] Code: 75 0e 00 f7 d8 64 89 02 b8 ff ff ff ff 31 d2 31 c9 31 ff 45 31 db c3 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 28 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 12 31 d2 31 c9 31 f6 31 ff 45 31 d2 45 31 db
> >     [    1.965846] RSP: 002b:00007ffe6a82bde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
> >     [    1.966788] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa9f3a7289e
> >     [    1.967644] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000001
> >     [    1.968480] RBP: 00007ffe6a82be50 R08: 0000000000000000 R09: 0000000000000000
> >     [    1.969396] R10: 0000000001000000 R11: 0000000000000246 R12: 0000000000000001
> >     [    1.970315] R13: 0000000001000000 R14: 0000000000000001 R15: 0000000000000000
> >     [    1.971214]  </TASK>
> >     [    1.971572] Modules linked in: overlay 9p ext4 crc32c_generic crc16 mbcache jbd2 hid_generic usbhid hid 9pnet_virtio 9pnet netfs sr_mod virtio_net cdrom virtio_blk net_failover atkbd failover libps2 vivaldi_fmap crc32c_intel ata_piix libata scsi_mod uhci_hcd ehci_hcd virtio_pci virtio_pci_legacy_dev virtio_pci_modern_dev scsi_common i8042 serio rtc_cmos dm_mod dax virtio_gpu virtio_dma_buf virtio_rng rng_core virtio_console virtio_balloon virtio virtio_ring
> >     [    1.976558] ---[ end trace 0000000000000000 ]---
> >     [    1.977219] RIP: 0010:__list_del_entry_valid_or_report+0xcc/0xd0
> >     [    1.978033] Code: 89 fe 48 89 c2 48 c7 c7 70 52 41 ba e8 2d 91 ac ff 90 0f 0b 48 89 d1 48 c7 c7 c0 52 41 ba 48 89 f2 48 89 c6 e8 15 91 ac ff 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f
> >     [    1.980179] RSP: 0018:ffff9ed880187748 EFLAGS: 00010246
> >     [    1.980847] RAX: 000000000000006d RBX: ffff94db3d83dc80 RCX: 0000000000000000
> >     [    1.981705] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> >     [    1.982584] RBP: ffffc80e40b9d940 R08: 0000000000000000 R09: 0000000000000000
> >     [    1.983464] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
> >     [    1.984358] R13: ffff94db3d83dc80 R14: ffffc80e40b9d948 R15: ffff94db3ffd6180
> >     [    1.987765] FS:  00007fa9f396eb80(0000) GS:ffff94db3d800000(0000) knlGS:0000000000000000
> >     [    1.988805] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >     [    1.989497] CR2: 00000000004d1829 CR3: 0000000001dd2000 CR4: 0000000000350ef0
> >     [    1.990418] note: cat[315] exited with preempt_count 2
> > 
> > I bisected it back to ee4cdf7ba857a894ad1650d6ab77669cbbfa329e which
> > also seems to touch part of the 9p VFS code.
> > 
> > Unfortunately the revert didn't apply cleanly on 6.12-rc1, so I couldn't
> > meaningfully test whether a simple revert solves the problem.
> > 
> > The VMs get the Nix store mounted via 9p. In the store are basically all
> > build artifacts including the stage-2 init script of the system that is
> > booted into in the VM test.
> > 
> > The invocation basically looks like this:
> > 
> >     qemu-system-x86_64 -cpu max \
> >         -name machine \
> >         -m 1024 \
> >         -smp 1 \
> >         -device virtio-rng-pci \
> >         -net nic,netdev=user.0,model=virtio -netdev user,id=user.0,"$QEMU_NET_OPTS" \
> >         -virtfs local,path=/nix/store,security_model=none,mount_tag=nix-store \
> >         -virtfs local,path="${SHARED_DIR:-$TMPDIR/xchg}",security_model=none,mount_tag=shared \
> >         -virtfs local,path="$TMPDIR"/xchg,security_model=none,mount_tag=xchg \
> >         -drive cache=writeback,file="$NIX_DISK_IMAGE",id=drive1,if=none,index=1,werror=report -device virtio-blk-pci,bootindex=1,drive=drive1,serial=root \
> >         -device virtio-net-pci,netdev=vlan1,mac=52:54:00:12:01:01 \
> >         -netdev vde,id=vlan1,sock="$QEMU_VDE_SOCKET_1" \
> >         -device virtio-keyboard \
> >         -usb \
> >         -device usb-tablet,bus=usb-bus.0 \
> >         -kernel ${NIXPKGS_QEMU_KERNEL_machine:-/nix/store/zv87gw0yxfsslq0mcc35a99k54da9a4z-nixos-system-machine-test/kernel} \
> >         -initrd /nix/store/qqalw1iq1wbgq3ndx0cvqn3bfypn56w2-initrd-linux-6.12-rc1/initrd \
> >         -append "$(cat /nix/store/zv87gw0yxfsslq0mcc35a99k54da9a4z-nixos-system-machine-test/kernel-params) init=/nix/store/zv87gw0yxfsslq0mcc35a99k54da9a4z-nixos-system-machine-test/init regInfo=/nix/store/5izvfal6xm2rk51v0r1h2cxcng33paby-closure-info/registration console=ttyS0 $QEMU_KERNEL_PARAMS" \
> >         $QEMU_OPTS
> > 
> > If you're using Nix, you can also reproduce this by running
> > 
> >     nix-build nixos/tests/kernel-generic.nix -A linux_testing
> > 
> > on 5c19646b81db43dd7f4b6954f17d71a523009706 from https://github.com/nixos/nixpkgs.
> > 
> > To me, this seems like a regression in rc1.
> > 
> > Is there anything else I can do to help troubleshooting this?
> > 
> > With best regards
> > 
> > Maximilian
> > 
> > 


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