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To: Greg Kroah-Hartman , linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org, Roman Shaposhnik , Thomas Gleixner , Juergen Gross References: <20200901150920.697676718@linuxfoundation.org> <20200901150923.247002384@linuxfoundation.org> From: Stefan Bader Autocrypt: addr=stefan.bader@canonical.com; prefer-encrypt=mutual; keydata= mQINBE5mmXEBEADoM0yd6ERIuH2sQjbCGtrt0SFCbpAuOgNy7LSDJw2vZHkZ1bLPtpojdQId 258o/4V+qLWaWLjbQdadzodnVUsvb+LUKJhFRB1kmzVYNxiu7AtxOnNmUn9dl1oS90IACo1B BpaMIunnKu1pp7s3sfzWapsNMwHbYVHXyJeaPFtMqOxd1V7bNEAC9uNjqJ3IG15f5/50+N+w LGkd5QJmp6Hs9RgCXQMDn989+qFnJga390C9JPWYye0sLjQeZTuUgdhebP0nvciOlKwaOC8v K3UwEIbjt+eL18kBq4VBgrqQiMupmTP9oQNYEgk2FiW3iAQ9BXE8VGiglUOF8KIe/2okVjdO nl3VgOHumV+emrE8XFOB2pgVmoklYNvOjaIV7UBesO5/16jbhGVDXskpZkrP/Ip+n9XD/EJM ismF8UcvcL4aPwZf9J03fZT4HARXuig/GXdK7nMgCRChKwsAARjw5f8lUx5iR1wZwSa7HhHP rAclUzjFNK2819/Ke5kM1UuT1X9aqL+uLYQEDB3QfJmdzVv5vHON3O7GOfaxBICo4Z5OdXSQ SRetiJ8YeUhKpWSqP59PSsbJg+nCKvWfkl/XUu5cFO4V/+NfivTttnoFwNhi/4lrBKZDhGVm 6Oo/VytPpGHXt29npHb8x0NsQOsfZeam9Z5ysmePwH/53Np8NQARAQABtDVTdGVmYW4gQmFk ZXIgKENhbm9uaWNhbCkgPHN0ZWZhbi5iYWRlckBjYW5vbmljYWwuY29tPokCVwQTAQoAQQIb AwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgAIZARYhBNtdfMrzmU4zldpNPuhnXe7L7s6jBQJd 7mXwBQkRwqX/AAoJEOhnXe7L7s6jwpgQALEz54XvgIhYi8qCwqkopEZXq2fYttMFMEMkW3dA 7Y/m5fnmPs/QYsfpn7LtQcmDGBz4W9YDL/KD+1YF1W1+vzo8NQTeR02DJksaTx2riyzI+zS9 YY/c0EvyauOWa8s9YvI9lzN+gWgOKyEK415nybXjU5FEMAF6jAjJ70T+DPeZjGBgkoDPKBRK O3DBgOV23rrAiMx9UXqAbcSUU4i1me6PTZaAbSeIiOPOdJfPgJP8ki3QuGF3ct23dLLlPame cCCgH4ZBMGb8ZQLhRfLNYao0dbDXcqQ+OSFl2pGToiC19MJj1im1Ca8Dc97JRuzkxOFKRfXA 9rYsVy7AV//pfVy3x5tT0fJQtz4UFU4Qzhi/08U2wgl9tsJxP2LCtcoXa7D+3ehe92cQNsrQ Xo6XKNzvOFoXzDBzoVU9SYTv12Y97zECJG11F+QmDiogudy+ioq+R9aKgMUIugnCh45LuZuR yj9quASYn5vf/YywML5vSVKNQ1+0jcO/vkwja4bMU0intA0se8ujjVMV/XXJb80PtghZVVL/ +xqnApGilIda5+QEbjdPO8XjNlFO8cIhez81+8m68ybnq5svfee/PJOEZ6jlxG5XIyb3B/ky gZY6kimPLeLcjxK4FVH5teiSB0IfpEMnQNLrjDzXWgmA/Bk7VNycPYOKvZnYuBNgA7wEuQIN BE5mmXEBEADCkRfuS1cAx02yTsk9gyAapcQnpb6EBay40Ch/IPrMF2iG4F0CX6puKubjjVbq L6jEKyksqPb57Vu9WAufy4Rlv3OwzaymmWk00CROCVSuEV+3bikBTnF/l+VVCvccNlpHsADM LncaATvSOj1iCXeikxNAk2LA3g9H8uz7lQUhjni05ixBZGDGbaxB6Odmh58q8k/iooREHyqf leSg1zpuBxYGKVug2daXLSvQI7w59eYO/L1YpLtu1sMzqRyYdSUyCiNcXDO/Ko221o2NfdqQ 9KET1az8QTsBnZeTsjsk4VnYwjc9ZEYN7LATWrhz8vgI2eP80lXxXm9kx81NubnOPxna5vg9 DhxZEjo8A+zE4c5bQuSCJ3GTnOalXsAz0Lwk1H1nFwizUqvmPI8eAqZGeZoJ409uDcNi2BrR +W7MjXxPM5k4M2zMiNfIvNBjclBLE/m7nrcxNLOk1z/KQiFVZQhtHXoOTUWmINZ+E3GIJT2D ToFxUoaEW2GdX0rjqEerbUaoo6SBX7HxmjAzseND9IatGTxgN+EhJUiIWK4UOH343erB7Hga 98WeEzZTq7W2NvwnqOVAq2ElnPhHrD98nWIBZPOEu6xgiyvVFfXJGmRBMRBR+8hBjfX0643n Lq3wYOrZbNfP8dJVQZ4GxI6OLTcwYNgifqp/SIJzE1tgkwARAQABiQI8BBgBCgAmAhsMFiEE 2118yvOZTjOV2k0+6Gdd7svuzqMFAl3uZkUFCRGHUtQACgkQ6Gdd7svuzqMZ8A/+OOxzg8PT 7B9o/YvbBuKfnc3WK2xFpYPsiqlRk+7NnV1BXOMpCe9jrKGy1erJg0WBD7BXg7mbQj6KH58o MslCZCkb4N1igwD2JiJo/Lf98DFdw6hUR8Ja/DOVhjpNjfbhF5EIIzkkV8K/pIrkRPOL6uld i2IPowtMky2yoIJ1cQdtREEUL/WcpRoLrW6ZqITx4RxL2nnUSp0kpr3sdsYmUoGKWAfBSO/W TCsypW4Ymd4tWST4NVFYOW2/pkROX8saRdznaCRFnn8QeTSb2WgDmXLLjGKancYmZPNRcdr9 OsFcWN2R3ljo6+frW58GoR1To4E7Jr2MucDK8wmvkf08NlnhqOzfaRvgdLLK5l5tv6LZOGCH 17imKDu6cH0qf0EVCCd3Oq8SIosKzcvYJRqwc6CJGJSaz9CNUHCnDUzMZq1Pi+C4FuK2i2jz X+xJRAvEX6xZ0BhfuKnum7KtZmBYACeL4V27Bes6r2YGEf4ZQq9kyNVZ6r+pmcyRS495Y+8r Vgixzb39xyLAzwOFCBpCcsT6MsdsqIx9ir+Dx3aVpU9kxzFLXmj1JnlqCvDx4g8q1kEU9ffD 6bmoRYuE45/feIEQGr1QueKac1rpRHhfohCTZNG2Jx1c6VwZCYvBKkOJMWpQwRtyEcShcX1j quuXTQgSgLXYhq37J+O42GU0Amw= Message-ID: Date: Tue, 29 Sep 2020 15:13:13 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200901150923.247002384@linuxfoundation.org> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="EaQfBhALU5eiihRQL8lwWXuWhT5C7Uww8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --EaQfBhALU5eiihRQL8lwWXuWhT5C7Uww8 Content-Type: multipart/mixed; boundary="MTRHGu7wJ6vOL5Sik8bdAe5dJQbbAdFby" --MTRHGu7wJ6vOL5Sik8bdAe5dJQbbAdFby Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 01.09.20 17:10, Greg Kroah-Hartman wrote: > From: Thomas Gleixner >=20 > commit c330fb1ddc0a922f044989492b7fcca77ee1db46 upstream. >=20 > handler data is meant for interrupt handlers and not for storing irq ch= ip > specific information as some devices require handler data to store inte= rnal > per interrupt information, e.g. pinctrl/GPIO chained interrupt handlers= =2E >=20 > This obviously creates a conflict of interests and crashes the machine > because the XEN pointer is overwritten by the driver pointer. I cannot say whether this applies the same for the vanilla 4.4 stable ker= nels but once this had been applied to our 4.4 based kernels, we observed Xen = HVM guests crashing on boot with: [ 0.927538] ACPI: bus type PCI registered [ 0.936008] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 0.948739] PCI: Using configuration type 1 for base access [ 0.960007] PCI: Using configuration type 1 for extended access [ 0.984340] ACPI: Added _OSI(Module Device) [ 0.988010] ACPI: Added _OSI(Processor Device) [ 0.992007] ACPI: Added _OSI(3.0 _SCP Extensions) [ 0.996013] ACPI: Added _OSI(Processor Aggregator Device) [ 1.002103] BUG: unable to handle kernel paging request at ffffffffff5= f3000 [ 1.004000] IP: [] mp_irqdomain_activate+0x5f/0xa0 [ 1.004000] PGD 1e0f067 PUD 1e11067 PMD 1e12067 PTE 0 [ 1.004000] Oops: 0002 [#1] SMP [ 1.004000] Modules linked in: [ 1.004000] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.4.0-191-generi= c #221-Ubuntu [ 1.004000] Hardware name: Xen HVM domU, BIOS 4.6.5 04/18/2018 [ 1.004000] task: ffff880107db0000 ti: ffff880107dac000 task.ti: ffff8= 80107dac000 [ 1.004000] RIP: 0010:[] [] mp_irqdomain_activate+0x5f/0xa0 [ 1.004000] RSP: 0018:ffff880107dafc48 EFLAGS: 00010086 [ 1.004000] RAX: 0000000000000086 RBX: ffff8800eb852140 RCX: 000000000= 0000000 [ 1.004000] RDX: ffffffffff5f3000 RSI: 0000000000000001 RDI: 000000000= 020c000 [ 1.004000] RBP: ffff880107dafc50 R08: ffffffff81ebdfd0 R09: 00000000f= fffffff [ 1.004000] R10: 0000000000000011 R11: 0000000000000009 R12: ffff88010= 880d400 [ 1.004000] R13: 0000000000000001 R14: 0000000000000009 R15: ffff8800e= b880080 [ 1.004000] FS: 0000000000000000(0000) GS:ffff880108ec0000(0000) knlGS:0000000000000000 [ 1.004000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.004000] CR2: ffffffffff5f3000 CR3: 0000000001e0a000 CR4: 000000000= 00006f0 [ 1.004000] Stack: [ 1.004000] ffff88010880bc58 ffff880107dafc70 ffffffff810ea644 ffff88= 010880bc00 [ 1.004000] ffff88010880bc58 ffff880107dafca0 ffffffff810e6d88 ffffff= ff810e1009 [ 1.004000] ffff88010880bc00 ffff88010880bca0 ffff8800eb880080 ffff88= 0107dafd38 [ 1.004000] Call Trace: [ 1.004000] [] irq_domain_activate_irq+0x44/0x50 [ 1.004000] [] irq_startup+0x38/0x90 [ 1.004000] [] ? vprintk_default+0x29/0x40 [ 1.004000] [] __setup_irq+0x5a2/0x650 [ 1.004000] [] ? kmem_cache_alloc_trace+0x1d4/0x1f0= [ 1.004000] [] ? acpi_osi_handler+0xb0/0xb0 [ 1.004000] [] request_threaded_irq+0xfb/0x1a0 [ 1.004000] [] ? acpi_osi_handler+0xb0/0xb0 [ 1.004000] [] ? acpi_ev_sci_dispatch+0x64/0x64 [ 1.004000] [] acpi_os_install_interrupt_handler+0x= aa/0x100 [ 1.004000] [] ? acpi_sleep_proc_init+0x28/0x28 [ 1.004000] [] acpi_ev_install_sci_handler+0x23/0x2= 5 [ 1.004000] [] acpi_ev_install_xrupt_handlers+0x1c/= 0x6c [ 1.004000] [] acpi_enable_subsystem+0x8f/0x93 [ 1.004000] [] acpi_init+0x8b/0x2c4 [ 1.004000] [] ? kasprintf+0x4e/0x70 [ 1.004000] [] ? acpi_sleep_proc_init+0x28/0x28 [ 1.004000] [] do_one_initcall+0xb5/0x200 [ 1.004000] [] ? parse_args+0x29a/0x4a0 [ 1.004000] [] kernel_init_freeable+0x177/0x218 [ 1.004000] [] ? rest_init+0x80/0x80 [ 1.004000] [] kernel_init+0xe/0xe0 [ 1.004000] [] ret_from_fork+0x42/0x80 [ 1.004000] [] ? rest_init+0x80/0x80 [ 1.004000] Code: 8d 1c d2 8d ba 0b 02 00 00 44 8d 51 11 42 8b 14 dd 7= 4 ec 10 82 c1 e7 0c 48 63 ff 81 e2 ff 0f 00 00 48 81 ea 00 10 80 00 48 29 fa <44>= 89 12 89 72 10 42 8b 14 dd 74 ec 10 82 83 c1 10 81 e2 ff 0f [ 1.004000] RIP [] mp_irqdomain_activate+0x5f/0xa0 [ 1.004000] RSP [ 1.004000] CR2: ffffffffff5f3000 [ 1.004000] ---[ end trace 3201cae5b6bd7be1 ]--- [ 1.592027] Kernel panic - not syncing: Attempted to kill init! exitcode=3D0x00000009 [ 1.592027] This is from a local server but same stack-trace happens on AWS instances= while initializing ACPI SCI. mp_irqdomain_activate is accessing chip_data expec= ting ioapic data there. Oddly enough more recent kernels seem to do the same b= ut not crashing as HVM guest (neither seen for our 4.15 nor the 5.4). Maybe someone could make sure the 4.4.y stable series is not also broken.= -Stefan >=20 > As the XEN data is not handler specific it should be stored in > irqdesc::irq_data::chip_data instead. >=20 > A simple sed s/irq_[sg]et_handler_data/irq_[sg]et_chip_data/ cures that= =2E >=20 > Cc: stable@vger.kernel.org > Reported-by: Roman Shaposhnik > Signed-off-by: Thomas Gleixner > Tested-by: Roman Shaposhnik > Reviewed-by: Juergen Gross > Link: https://lore.kernel.org/r/87lfi2yckt.fsf@nanos.tec.linutronix.de > Signed-off-by: Juergen Gross > Signed-off-by: Greg Kroah-Hartman >=20 > --- > drivers/xen/events/events_base.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) >=20 > --- a/drivers/xen/events/events_base.c > +++ b/drivers/xen/events/events_base.c > @@ -155,7 +155,7 @@ int get_evtchn_to_irq(unsigned evtchn) > /* Get info for IRQ */ > struct irq_info *info_for_irq(unsigned irq) > { > - return irq_get_handler_data(irq); > + return irq_get_chip_data(irq); > } > =20 > /* Constructors for packed IRQ information. */ > @@ -384,7 +384,7 @@ static void xen_irq_init(unsigned irq) > info->type =3D IRQT_UNBOUND; > info->refcnt =3D -1; > =20 > - irq_set_handler_data(irq, info); > + irq_set_chip_data(irq, info); > =20 > list_add_tail(&info->list, &xen_irq_list_head); > } > @@ -433,14 +433,14 @@ static int __must_check xen_allocate_irq > =20 > static void xen_free_irq(unsigned irq) > { > - struct irq_info *info =3D irq_get_handler_data(irq); > + struct irq_info *info =3D irq_get_chip_data(irq); > =20 > if (WARN_ON(!info)) > return; > =20 > list_del(&info->list); > =20 > - irq_set_handler_data(irq, NULL); > + irq_set_chip_data(irq, NULL); > =20 > WARN_ON(info->refcnt > 0); > =20 > @@ -610,7 +610,7 @@ EXPORT_SYMBOL_GPL(xen_irq_from_gsi); > static void __unbind_from_irq(unsigned int irq) > { > int evtchn =3D evtchn_from_irq(irq); > - struct irq_info *info =3D irq_get_handler_data(irq); > + struct irq_info *info =3D irq_get_chip_data(irq); > =20 > if (info->refcnt > 0) { > info->refcnt--; > @@ -1114,7 +1114,7 @@ int bind_ipi_to_irqhandler(enum ipi_vect > =20 > void unbind_from_irqhandler(unsigned int irq, void *dev_id) > { > - struct irq_info *info =3D irq_get_handler_data(irq); > + struct irq_info *info =3D irq_get_chip_data(irq); > =20 > if (WARN_ON(!info)) > return; > @@ -1148,7 +1148,7 @@ int evtchn_make_refcounted(unsigned int > if (irq =3D=3D -1) > return -ENOENT; > =20 > - info =3D irq_get_handler_data(irq); > + info =3D irq_get_chip_data(irq); > =20 > if (!info) > return -ENOENT; > @@ -1176,7 +1176,7 @@ int evtchn_get(unsigned int evtchn) > if (irq =3D=3D -1) > goto done; > =20 > - info =3D irq_get_handler_data(irq); > + info =3D irq_get_chip_data(irq); > =20 > if (!info) > goto done; >=20 >=20 --MTRHGu7wJ6vOL5Sik8bdAe5dJQbbAdFby-- --EaQfBhALU5eiihRQL8lwWXuWhT5C7Uww8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE2118yvOZTjOV2k0+6Gdd7svuzqMFAl9zMukACgkQ6Gdd7svu zqMHSA//UwqSxFlKUUMe4KMTOq08LV+HDOS63+XFPVC0o3H+KLHdxdVWghAXu/dk oQjx5C9/zcxkAf8euYTwPYrFCmUYFQwZqtazThuLd0BC8hcxgTusgOd/R/dFs76+ Qy8nl7QW3zLzsQa0lZSLSXtZ9HB8hvzGNtMpfpWz4Uzqtmxqqv5+mLJrpS09BMhG 5YLAE54K3KhfLEKmPHA1JppVy7iCyY9sMSfgPCTx1bSn/cwIKv/pHmkHNpQQTMmQ tmb/8lrYk1f1PLdLNFTZDOut4i7ViBMe96mVCgjJAFQOwTrrYZvuhEHmzMksBAgQ uNjyk0eZe0Uz3q77sW7MxUVdvPcb1tWsRbkh6SBHAKnCTcQgDsBR4tUF4kg2hC+o pd6mHYNItYNEcmuJ93xIYMxgofQHauXg9vD7rhQyfsPiRU9+ZMrWsWbF2/P5To0z sAtYjDX4OOQ/LU5GbXVL8s3i8AnOsKTP1b99l8/hZSVSmYErU5d8OanmfR1sXa9m FuFEEY1AqXEjuDGIcU2ZpsKiivFZLF1qQJLD6Ff0utd7Fx9uRJUdJHrqP4qjWfzW e73GnlaakrdLAFiiS3wEFUPpefKRhkKS/IM4ATLBrvKS1x3axX6AMdGygeFVqS1p EtPJYdCXa3jpJ/YWtFjD7HX0csACVFx4MHL42FX1jH025WuLg0I= =L1gn -----END PGP SIGNATURE----- --EaQfBhALU5eiihRQL8lwWXuWhT5C7Uww8--