* Request for help on CXL kernel panic with recent QEMU/Linux
@ 2025-05-04 8:22 Parthasarathy, Mohan (Compute)
2025-05-05 4:33 ` Fan Ni
2025-05-05 15:18 ` Dave Jiang
0 siblings, 2 replies; 5+ messages in thread
From: Parthasarathy, Mohan (Compute) @ 2025-05-04 8:22 UTC (permalink / raw)
To: linux-cxl@vger.kernel.org
Hi all,
Can anyone take a look and see if this a known issue ? Also, any tips on whether the issue is likely with my Linux version or QEMU ? I can share more details if required but just wanted to know if this looks obvious to expert eyes.
Regards,
Mohan
[ 57.988032] ------------[ cut here ]------------
[ 57.990637] memcpy: detected buffer overflow: 96 byte write of buffer size 0
[ 57.994123] WARNING: CPU: 0 PID: 46 at lib/string_helpers.c:1032 __fortify_report+0x55/0xa0
[ 58.001055] Modules linked in: cxl_pci i2c_i801(+) irqbypass vfat pcspkr fat i2c_smbus mctp_i2c(+) parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
[ 58.016135] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Not tainted 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
[ 58.021711] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 58.025755] Workqueue: async async_run_entry_fn
[ 58.029028] RIP: 0010:__fortify_report+0x55/0xa0
[ 58.032915] Code: 01 48 8b 34 c5 20 1f 73 b9 48 c7 c1 06 58 f2 b9 48 c7 c0 fc 57 f2 b9 48 0f 44 c8 4c 89 ca 48 c7 c7 d8 ef e3 b9 e8 bb 2e 80 ff <0f> 0b 48 83 c4 20 c3 cc cc cc cc 48 89 74 24 10 48 89 c6 89 7c 24
[ 58.039451] RSP: 0018:ffffd248801a3a38 EFLAGS: 00010246
[ 58.047157] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
[ 58.053599] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
[ 58.059967] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
[ 58.064773] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
[ 58.075635] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
[ 58.084667] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
[ 58.096028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 58.106050] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
[ 58.117482] Call Trace:
[ 58.121907] <TASK>
[ 58.129551] ? cxl_internal_send_cmd+0x3c/0xf0 [cxl_core]
[ 58.139570] __fortify_panic+0xd/0xf
[ 58.146273] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
[ 58.153161] cxl_pci_probe+0x431/0xa90 [cxl_pci]
[ 58.158287] ? kernfs_xattr_get+0x3b/0x70
[ 58.161167] ? selinux_kernfs_init_security+0x74/0x250
[ 58.167922] ? try_to_wake_up+0x7f/0x760
[ 58.170137] local_pci_probe+0x42/0x90
[ 58.172399] pci_device_probe+0xda/0x2b0
[ 58.177444] ? sysfs_do_create_link_sd+0x6d/0xd0
[ 58.182205] really_probe+0xde/0x340
[ 58.190234] ? pm_runtime_barrier+0x55/0x90
[ 58.192903] __driver_probe_device+0x78/0x140
[ 58.197956] driver_probe_device+0x1f/0xa0
[ 58.203673] __driver_attach_async_helper+0x5e/0xe0
[ 58.208474] async_run_entry_fn+0x34/0x130
[ 58.217941] process_one_work+0x18e/0x350
[ 58.221932] worker_thread+0x25a/0x3a0
[ 58.223804] ? __pfx_worker_thread+0x10/0x10
[ 58.229040] kthread+0xfc/0x240
[ 58.237142] ? __pfx_kthread+0x10/0x10
[ 58.246321] ret_from_fork+0x34/0x50
[ 58.253927] ? __pfx_kthread+0x10/0x10
[ 58.261905] ret_from_fork_asm+0x1a/0x30
[ 58.267821] </TASK>
[ 58.269775] ---[ end trace 0000000000000000 ]---
[ 58.274065] ------------[ cut here ]------------
[ 58.282586] kernel BUG at lib/string_helpers.c:1040!
[ 58.293976] Oops: invalid opcode: 0000 [#1] SMP NOPTI
[ 58.299430] audit: type=1130 audit(1746252020.305:32): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-random-seed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[ 58.299474] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Tainted: G W 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
[ 58.313086] Tainted: [W]=WARN
[ 58.317049] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 58.322714] Workqueue: async async_run_entry_fn
[ 58.329051] RIP: 0010:__fortify_panic+0xd/0xf
[ 58.332500] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
[ 58.339956] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
[ 58.348114] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
[ 58.356607] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
[ 58.360981] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
[ 58.366267] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
[ 58.369804] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
[ 58.376177] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
[ 58.380150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 58.384364] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
[ 58.387660] Call Trace:
[ 58.390086] <TASK>
[ 58.392804] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
[ 58.395791] cxl_pci_probe+0x431/0xa90 [cxl_pci]
[ 58.409127] ? kernfs_xattr_get+0x3b/0x70
[ 58.415392] ? selinux_kernfs_init_security+0x74/0x250
[ 58.420775] ? try_to_wake_up+0x7f/0x760
[ 58.423879] local_pci_probe+0x42/0x90
[ 58.429026] pci_device_probe+0xda/0x2b0
[ 58.433175] ? sysfs_do_create_link_sd+0x6d/0xd0
[ 58.438630] really_probe+0xde/0x340
[ 58.440769] ? pm_runtime_barrier+0x55/0x90
[ 58.442846] __driver_probe_device+0x78/0x140
[ 58.445598] driver_probe_device+0x1f/0xa0
[ 58.448532] __driver_attach_async_helper+0x5e/0xe0
[ 58.451848] async_run_entry_fn+0x34/0x130
[ 58.456739] process_one_work+0x18e/0x350
[ 58.462118] worker_thread+0x25a/0x3a0
[ 58.467050] ? __pfx_worker_thread+0x10/0x10
[ 58.470596] kthread+0xfc/0x240
[ 58.474475] ? __pfx_kthread+0x10/0x10
[ 58.477836] ret_from_fork+0x34/0x50
[ 58.480791] ? __pfx_kthread+0x10/0x10
[ 58.484168] ret_from_fork_asm+0x1a/0x30
[ 58.487363] </TASK>
[ 58.490697] Modules linked in: cxl_pci i2c_i801 irqbypass vfat pcspkr fat i2c_smbus mctp_i2c parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
[ 58.505259] ---[ end trace 0000000000000000 ]---
[ 58.509396] RIP: 0010:__fortify_panic+0xd/0xf
[ 58.512731] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
[ 58.520925] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
[ 58.524495] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
[ 58.528365] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
[ 58.532956] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
[ 58.536365] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
[ 58.540179] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
[ 58.546765] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
[ 58.550843] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 58.554470] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
[ 59.773090] iTCO_vendor_support: vendor-support=0
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Request for help on CXL kernel panic with recent QEMU/Linux
2025-05-04 8:22 Request for help on CXL kernel panic with recent QEMU/Linux Parthasarathy, Mohan (Compute)
@ 2025-05-05 4:33 ` Fan Ni
2025-05-05 15:18 ` Dave Jiang
1 sibling, 0 replies; 5+ messages in thread
From: Fan Ni @ 2025-05-05 4:33 UTC (permalink / raw)
To: Parthasarathy, Mohan (Compute); +Cc: linux-cxl@vger.kernel.org
On Sun, May 04, 2025 at 08:22:04AM +0000, Parthasarathy, Mohan (Compute) wrote:
> Hi all,
>
> Can anyone take a look and see if this a known issue ? Also, any tips on whether the issue is likely with my Linux version or QEMU ? I can share more details if required but just wanted to know if this looks obvious to expert eyes.
>
Hi Mohan,
It would be better if you can share your qemu and kernel setup details so
people who can help look into to it can reproduce your issue and
analyze.
Fan
> Regards,
> Mohan
>
>
>
> [ 57.988032] ------------[ cut here ]------------
> [ 57.990637] memcpy: detected buffer overflow: 96 byte write of buffer size 0
> [ 57.994123] WARNING: CPU: 0 PID: 46 at lib/string_helpers.c:1032 __fortify_report+0x55/0xa0
> [ 58.001055] Modules linked in: cxl_pci i2c_i801(+) irqbypass vfat pcspkr fat i2c_smbus mctp_i2c(+) parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
> [ 58.016135] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Not tainted 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
> [ 58.021711] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> [ 58.025755] Workqueue: async async_run_entry_fn
> [ 58.029028] RIP: 0010:__fortify_report+0x55/0xa0
> [ 58.032915] Code: 01 48 8b 34 c5 20 1f 73 b9 48 c7 c1 06 58 f2 b9 48 c7 c0 fc 57 f2 b9 48 0f 44 c8 4c 89 ca 48 c7 c7 d8 ef e3 b9 e8 bb 2e 80 ff <0f> 0b 48 83 c4 20 c3 cc cc cc cc 48 89 74 24 10 48 89 c6 89 7c 24
> [ 58.039451] RSP: 0018:ffffd248801a3a38 EFLAGS: 00010246
> [ 58.047157] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.053599] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.059967] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.064773] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.075635] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.084667] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.096028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.106050] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 58.117482] Call Trace:
> [ 58.121907] <TASK>
> [ 58.129551] ? cxl_internal_send_cmd+0x3c/0xf0 [cxl_core]
> [ 58.139570] __fortify_panic+0xd/0xf
> [ 58.146273] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
> [ 58.153161] cxl_pci_probe+0x431/0xa90 [cxl_pci]
> [ 58.158287] ? kernfs_xattr_get+0x3b/0x70
> [ 58.161167] ? selinux_kernfs_init_security+0x74/0x250
> [ 58.167922] ? try_to_wake_up+0x7f/0x760
> [ 58.170137] local_pci_probe+0x42/0x90
> [ 58.172399] pci_device_probe+0xda/0x2b0
> [ 58.177444] ? sysfs_do_create_link_sd+0x6d/0xd0
> [ 58.182205] really_probe+0xde/0x340
> [ 58.190234] ? pm_runtime_barrier+0x55/0x90
> [ 58.192903] __driver_probe_device+0x78/0x140
> [ 58.197956] driver_probe_device+0x1f/0xa0
> [ 58.203673] __driver_attach_async_helper+0x5e/0xe0
> [ 58.208474] async_run_entry_fn+0x34/0x130
> [ 58.217941] process_one_work+0x18e/0x350
> [ 58.221932] worker_thread+0x25a/0x3a0
> [ 58.223804] ? __pfx_worker_thread+0x10/0x10
> [ 58.229040] kthread+0xfc/0x240
> [ 58.237142] ? __pfx_kthread+0x10/0x10
> [ 58.246321] ret_from_fork+0x34/0x50
> [ 58.253927] ? __pfx_kthread+0x10/0x10
> [ 58.261905] ret_from_fork_asm+0x1a/0x30
> [ 58.267821] </TASK>
> [ 58.269775] ---[ end trace 0000000000000000 ]---
> [ 58.274065] ------------[ cut here ]------------
> [ 58.282586] kernel BUG at lib/string_helpers.c:1040!
> [ 58.293976] Oops: invalid opcode: 0000 [#1] SMP NOPTI
> [ 58.299430] audit: type=1130 audit(1746252020.305:32): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-random-seed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
> [ 58.299474] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Tainted: G W 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
> [ 58.313086] Tainted: [W]=WARN
> [ 58.317049] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> [ 58.322714] Workqueue: async async_run_entry_fn
> [ 58.329051] RIP: 0010:__fortify_panic+0xd/0xf
> [ 58.332500] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
> [ 58.339956] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
> [ 58.348114] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.356607] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.360981] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.366267] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.369804] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.376177] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.380150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.384364] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 58.387660] Call Trace:
> [ 58.390086] <TASK>
> [ 58.392804] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
> [ 58.395791] cxl_pci_probe+0x431/0xa90 [cxl_pci]
> [ 58.409127] ? kernfs_xattr_get+0x3b/0x70
> [ 58.415392] ? selinux_kernfs_init_security+0x74/0x250
> [ 58.420775] ? try_to_wake_up+0x7f/0x760
> [ 58.423879] local_pci_probe+0x42/0x90
> [ 58.429026] pci_device_probe+0xda/0x2b0
> [ 58.433175] ? sysfs_do_create_link_sd+0x6d/0xd0
> [ 58.438630] really_probe+0xde/0x340
> [ 58.440769] ? pm_runtime_barrier+0x55/0x90
> [ 58.442846] __driver_probe_device+0x78/0x140
> [ 58.445598] driver_probe_device+0x1f/0xa0
> [ 58.448532] __driver_attach_async_helper+0x5e/0xe0
> [ 58.451848] async_run_entry_fn+0x34/0x130
> [ 58.456739] process_one_work+0x18e/0x350
> [ 58.462118] worker_thread+0x25a/0x3a0
> [ 58.467050] ? __pfx_worker_thread+0x10/0x10
> [ 58.470596] kthread+0xfc/0x240
> [ 58.474475] ? __pfx_kthread+0x10/0x10
> [ 58.477836] ret_from_fork+0x34/0x50
> [ 58.480791] ? __pfx_kthread+0x10/0x10
> [ 58.484168] ret_from_fork_asm+0x1a/0x30
> [ 58.487363] </TASK>
> [ 58.490697] Modules linked in: cxl_pci i2c_i801 irqbypass vfat pcspkr fat i2c_smbus mctp_i2c parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
> [ 58.505259] ---[ end trace 0000000000000000 ]---
> [ 58.509396] RIP: 0010:__fortify_panic+0xd/0xf
> [ 58.512731] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
> [ 58.520925] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
> [ 58.524495] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.528365] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.532956] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.536365] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.540179] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.546765] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.550843] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.554470] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 59.773090] iTCO_vendor_support: vendor-support=0
--
Fan Ni
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Request for help on CXL kernel panic with recent QEMU/Linux
2025-05-04 8:22 Request for help on CXL kernel panic with recent QEMU/Linux Parthasarathy, Mohan (Compute)
2025-05-05 4:33 ` Fan Ni
@ 2025-05-05 15:18 ` Dave Jiang
2025-05-08 14:27 ` Parthasarathy, Mohan (Compute)
1 sibling, 1 reply; 5+ messages in thread
From: Dave Jiang @ 2025-05-05 15:18 UTC (permalink / raw)
To: Parthasarathy, Mohan (Compute), linux-cxl@vger.kernel.org,
Shiju Jose
On 5/4/25 1:22 AM, Parthasarathy, Mohan (Compute) wrote:
> Hi all,
>
> Can anyone take a look and see if this a known issue ? Also, any tips on whether the issue is likely with my Linux version or QEMU ? I can share more details if required but just wanted to know if this looks obvious to expert eyes.
kernel version?
Also running ./scripts/faddr2line on cxl_internal_send_cmd+0x3c/0xf0 and devm_cxl_setup_features.cold+0x43/0x43 would be helpful.
I've not seen that on my qemu setup with 6.15-rc4. I'm also using upstream qemu. So your kernel version and qemu version and passed in parameters would be helpful.
Shiju,
Have you encountered anything like this with your Features testing with RAS on qemu?
>
> Regards,
> Mohan
>
>
>
> [ 57.988032] ------------[ cut here ]------------
> [ 57.990637] memcpy: detected buffer overflow: 96 byte write of buffer size 0
> [ 57.994123] WARNING: CPU: 0 PID: 46 at lib/string_helpers.c:1032 __fortify_report+0x55/0xa0
> [ 58.001055] Modules linked in: cxl_pci i2c_i801(+) irqbypass vfat pcspkr fat i2c_smbus mctp_i2c(+) parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
> [ 58.016135] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Not tainted 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
> [ 58.021711] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> [ 58.025755] Workqueue: async async_run_entry_fn
> [ 58.029028] RIP: 0010:__fortify_report+0x55/0xa0
> [ 58.032915] Code: 01 48 8b 34 c5 20 1f 73 b9 48 c7 c1 06 58 f2 b9 48 c7 c0 fc 57 f2 b9 48 0f 44 c8 4c 89 ca 48 c7 c7 d8 ef e3 b9 e8 bb 2e 80 ff <0f> 0b 48 83 c4 20 c3 cc cc cc cc 48 89 74 24 10 48 89 c6 89 7c 24
> [ 58.039451] RSP: 0018:ffffd248801a3a38 EFLAGS: 00010246
> [ 58.047157] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.053599] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.059967] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.064773] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.075635] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.084667] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.096028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.106050] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 58.117482] Call Trace:
> [ 58.121907] <TASK>
> [ 58.129551] ? cxl_internal_send_cmd+0x3c/0xf0 [cxl_core]
> [ 58.139570] __fortify_panic+0xd/0xf
> [ 58.146273] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
> [ 58.153161] cxl_pci_probe+0x431/0xa90 [cxl_pci]
> [ 58.158287] ? kernfs_xattr_get+0x3b/0x70
> [ 58.161167] ? selinux_kernfs_init_security+0x74/0x250
> [ 58.167922] ? try_to_wake_up+0x7f/0x760
> [ 58.170137] local_pci_probe+0x42/0x90
> [ 58.172399] pci_device_probe+0xda/0x2b0
> [ 58.177444] ? sysfs_do_create_link_sd+0x6d/0xd0
> [ 58.182205] really_probe+0xde/0x340
> [ 58.190234] ? pm_runtime_barrier+0x55/0x90
> [ 58.192903] __driver_probe_device+0x78/0x140
> [ 58.197956] driver_probe_device+0x1f/0xa0
> [ 58.203673] __driver_attach_async_helper+0x5e/0xe0
> [ 58.208474] async_run_entry_fn+0x34/0x130
> [ 58.217941] process_one_work+0x18e/0x350
> [ 58.221932] worker_thread+0x25a/0x3a0
> [ 58.223804] ? __pfx_worker_thread+0x10/0x10
> [ 58.229040] kthread+0xfc/0x240
> [ 58.237142] ? __pfx_kthread+0x10/0x10
> [ 58.246321] ret_from_fork+0x34/0x50
> [ 58.253927] ? __pfx_kthread+0x10/0x10
> [ 58.261905] ret_from_fork_asm+0x1a/0x30
> [ 58.267821] </TASK>
> [ 58.269775] ---[ end trace 0000000000000000 ]---
> [ 58.274065] ------------[ cut here ]------------
> [ 58.282586] kernel BUG at lib/string_helpers.c:1040!
> [ 58.293976] Oops: invalid opcode: 0000 [#1] SMP NOPTI
> [ 58.299430] audit: type=1130 audit(1746252020.305:32): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-random-seed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
> [ 58.299474] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Tainted: G W 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
> [ 58.313086] Tainted: [W]=WARN
> [ 58.317049] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> [ 58.322714] Workqueue: async async_run_entry_fn
> [ 58.329051] RIP: 0010:__fortify_panic+0xd/0xf
> [ 58.332500] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
> [ 58.339956] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
> [ 58.348114] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.356607] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.360981] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.366267] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.369804] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.376177] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.380150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.384364] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 58.387660] Call Trace:
> [ 58.390086] <TASK>
> [ 58.392804] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
> [ 58.395791] cxl_pci_probe+0x431/0xa90 [cxl_pci]
> [ 58.409127] ? kernfs_xattr_get+0x3b/0x70
> [ 58.415392] ? selinux_kernfs_init_security+0x74/0x250
> [ 58.420775] ? try_to_wake_up+0x7f/0x760
> [ 58.423879] local_pci_probe+0x42/0x90
> [ 58.429026] pci_device_probe+0xda/0x2b0
> [ 58.433175] ? sysfs_do_create_link_sd+0x6d/0xd0
> [ 58.438630] really_probe+0xde/0x340
> [ 58.440769] ? pm_runtime_barrier+0x55/0x90
> [ 58.442846] __driver_probe_device+0x78/0x140
> [ 58.445598] driver_probe_device+0x1f/0xa0
> [ 58.448532] __driver_attach_async_helper+0x5e/0xe0
> [ 58.451848] async_run_entry_fn+0x34/0x130
> [ 58.456739] process_one_work+0x18e/0x350
> [ 58.462118] worker_thread+0x25a/0x3a0
> [ 58.467050] ? __pfx_worker_thread+0x10/0x10
> [ 58.470596] kthread+0xfc/0x240
> [ 58.474475] ? __pfx_kthread+0x10/0x10
> [ 58.477836] ret_from_fork+0x34/0x50
> [ 58.480791] ? __pfx_kthread+0x10/0x10
> [ 58.484168] ret_from_fork_asm+0x1a/0x30
> [ 58.487363] </TASK>
> [ 58.490697] Modules linked in: cxl_pci i2c_i801 irqbypass vfat pcspkr fat i2c_smbus mctp_i2c parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
> [ 58.505259] ---[ end trace 0000000000000000 ]---
> [ 58.509396] RIP: 0010:__fortify_panic+0xd/0xf
> [ 58.512731] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
> [ 58.520925] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
> [ 58.524495] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.528365] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.532956] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.536365] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.540179] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.546765] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.550843] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.554470] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 59.773090] iTCO_vendor_support: vendor-support=0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: Request for help on CXL kernel panic with recent QEMU/Linux
2025-05-05 15:18 ` Dave Jiang
@ 2025-05-08 14:27 ` Parthasarathy, Mohan (Compute)
2025-05-08 19:05 ` Dave Jiang
0 siblings, 1 reply; 5+ messages in thread
From: Parthasarathy, Mohan (Compute) @ 2025-05-08 14:27 UTC (permalink / raw)
To: Dave Jiang, linux-cxl@vger.kernel.org, Shiju Jose
Dave, all, I could make this work by disabling CONFIG_FORTIFY_SOURCE. There is a memcpy in the CXL setup features code that may need to be revisited to
see if it is a bug with the CXL code or the fortify verifications.
Regards,
Mohan
-----Original Message-----
From: Dave Jiang <dave.jiang@intel.com>
Sent: Monday, May 5, 2025 8:49 PM
To: Parthasarathy, Mohan (Compute) <mohan_parthasarathy@hpe.com>; linux-cxl@vger.kernel.org; Shiju Jose <shiju.jose@huawei.com>
Subject: Re: Request for help on CXL kernel panic with recent QEMU/Linux
On 5/4/25 1:22 AM, Parthasarathy, Mohan (Compute) wrote:
> Hi all,
>
> Can anyone take a look and see if this a known issue ? Also, any tips on whether the issue is likely with my Linux version or QEMU ? I can share more details if required but just wanted to know if this looks obvious to expert eyes.
kernel version?
Also running ./scripts/faddr2line on cxl_internal_send_cmd+0x3c/0xf0 and devm_cxl_setup_features.cold+0x43/0x43 would be helpful.
I've not seen that on my qemu setup with 6.15-rc4. I'm also using upstream qemu. So your kernel version and qemu version and passed in parameters would be helpful.
Shiju,
Have you encountered anything like this with your Features testing with RAS on qemu?
>
> Regards,
> Mohan
>
>
>
> [ 57.988032] ------------[ cut here ]------------
> [ 57.990637] memcpy: detected buffer overflow: 96 byte write of buffer size 0
> [ 57.994123] WARNING: CPU: 0 PID: 46 at lib/string_helpers.c:1032 __fortify_report+0x55/0xa0
> [ 58.001055] Modules linked in: cxl_pci i2c_i801(+) irqbypass vfat pcspkr fat i2c_smbus mctp_i2c(+) parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
> [ 58.016135] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Not tainted 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
> [ 58.021711] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> [ 58.025755] Workqueue: async async_run_entry_fn
> [ 58.029028] RIP: 0010:__fortify_report+0x55/0xa0
> [ 58.032915] Code: 01 48 8b 34 c5 20 1f 73 b9 48 c7 c1 06 58 f2 b9 48 c7 c0 fc 57 f2 b9 48 0f 44 c8 4c 89 ca 48 c7 c7 d8 ef e3 b9 e8 bb 2e 80 ff <0f> 0b 48 83 c4 20 c3 cc cc cc cc 48 89 74 24 10 48 89 c6 89 7c 24
> [ 58.039451] RSP: 0018:ffffd248801a3a38 EFLAGS: 00010246
> [ 58.047157] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.053599] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.059967] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.064773] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.075635] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.084667] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.096028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.106050] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 58.117482] Call Trace:
> [ 58.121907] <TASK>
> [ 58.129551] ? cxl_internal_send_cmd+0x3c/0xf0 [cxl_core]
> [ 58.139570] __fortify_panic+0xd/0xf
> [ 58.146273] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
> [ 58.153161] cxl_pci_probe+0x431/0xa90 [cxl_pci]
> [ 58.158287] ? kernfs_xattr_get+0x3b/0x70
> [ 58.161167] ? selinux_kernfs_init_security+0x74/0x250
> [ 58.167922] ? try_to_wake_up+0x7f/0x760
> [ 58.170137] local_pci_probe+0x42/0x90
> [ 58.172399] pci_device_probe+0xda/0x2b0
> [ 58.177444] ? sysfs_do_create_link_sd+0x6d/0xd0
> [ 58.182205] really_probe+0xde/0x340
> [ 58.190234] ? pm_runtime_barrier+0x55/0x90
> [ 58.192903] __driver_probe_device+0x78/0x140
> [ 58.197956] driver_probe_device+0x1f/0xa0
> [ 58.203673] __driver_attach_async_helper+0x5e/0xe0
> [ 58.208474] async_run_entry_fn+0x34/0x130
> [ 58.217941] process_one_work+0x18e/0x350
> [ 58.221932] worker_thread+0x25a/0x3a0
> [ 58.223804] ? __pfx_worker_thread+0x10/0x10
> [ 58.229040] kthread+0xfc/0x240
> [ 58.237142] ? __pfx_kthread+0x10/0x10
> [ 58.246321] ret_from_fork+0x34/0x50
> [ 58.253927] ? __pfx_kthread+0x10/0x10
> [ 58.261905] ret_from_fork_asm+0x1a/0x30
> [ 58.267821] </TASK>
> [ 58.269775] ---[ end trace 0000000000000000 ]---
> [ 58.274065] ------------[ cut here ]------------
> [ 58.282586] kernel BUG at lib/string_helpers.c:1040!
> [ 58.293976] Oops: invalid opcode: 0000 [#1] SMP NOPTI
> [ 58.299430] audit: type=1130 audit(1746252020.305:32): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-random-seed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
> [ 58.299474] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Tainted: G W 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
> [ 58.313086] Tainted: [W]=WARN
> [ 58.317049] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
> [ 58.322714] Workqueue: async async_run_entry_fn
> [ 58.329051] RIP: 0010:__fortify_panic+0xd/0xf
> [ 58.332500] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
> [ 58.339956] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
> [ 58.348114] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.356607] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.360981] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.366267] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.369804] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.376177] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.380150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.384364] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 58.387660] Call Trace:
> [ 58.390086] <TASK>
> [ 58.392804] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
> [ 58.395791] cxl_pci_probe+0x431/0xa90 [cxl_pci]
> [ 58.409127] ? kernfs_xattr_get+0x3b/0x70
> [ 58.415392] ? selinux_kernfs_init_security+0x74/0x250
> [ 58.420775] ? try_to_wake_up+0x7f/0x760
> [ 58.423879] local_pci_probe+0x42/0x90
> [ 58.429026] pci_device_probe+0xda/0x2b0
> [ 58.433175] ? sysfs_do_create_link_sd+0x6d/0xd0
> [ 58.438630] really_probe+0xde/0x340
> [ 58.440769] ? pm_runtime_barrier+0x55/0x90
> [ 58.442846] __driver_probe_device+0x78/0x140
> [ 58.445598] driver_probe_device+0x1f/0xa0
> [ 58.448532] __driver_attach_async_helper+0x5e/0xe0
> [ 58.451848] async_run_entry_fn+0x34/0x130
> [ 58.456739] process_one_work+0x18e/0x350
> [ 58.462118] worker_thread+0x25a/0x3a0
> [ 58.467050] ? __pfx_worker_thread+0x10/0x10
> [ 58.470596] kthread+0xfc/0x240
> [ 58.474475] ? __pfx_kthread+0x10/0x10
> [ 58.477836] ret_from_fork+0x34/0x50
> [ 58.480791] ? __pfx_kthread+0x10/0x10
> [ 58.484168] ret_from_fork_asm+0x1a/0x30
> [ 58.487363] </TASK>
> [ 58.490697] Modules linked in: cxl_pci i2c_i801 irqbypass vfat pcspkr fat i2c_smbus mctp_i2c parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
> [ 58.505259] ---[ end trace 0000000000000000 ]---
> [ 58.509396] RIP: 0010:__fortify_panic+0xd/0xf
> [ 58.512731] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
> [ 58.520925] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
> [ 58.524495] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
> [ 58.528365] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
> [ 58.532956] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
> [ 58.536365] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
> [ 58.540179] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
> [ 58.546765] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
> [ 58.550843] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 58.554470] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
> [ 59.773090] iTCO_vendor_support: vendor-support=0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Request for help on CXL kernel panic with recent QEMU/Linux
2025-05-08 14:27 ` Parthasarathy, Mohan (Compute)
@ 2025-05-08 19:05 ` Dave Jiang
0 siblings, 0 replies; 5+ messages in thread
From: Dave Jiang @ 2025-05-08 19:05 UTC (permalink / raw)
To: Parthasarathy, Mohan (Compute), linux-cxl@vger.kernel.org,
Shiju Jose
On 5/8/25 7:27 AM, Parthasarathy, Mohan (Compute) wrote:
> Dave, all, I could make this work by disabling CONFIG_FORTIFY_SOURCE. There is a memcpy in the CXL setup features code that may need to be revisited to
> see if it is a bug with the CXL code or the fortify verifications.
Thanks for the new info. I'm still not able to reproduce after turning on CONFIG_FORTIFY_SOURCE. I may need the qemu that supports features. Which qemu version are you using?
DJ
>
> Regards,
> Mohan
>
>
> -----Original Message-----
> From: Dave Jiang <dave.jiang@intel.com>
> Sent: Monday, May 5, 2025 8:49 PM
> To: Parthasarathy, Mohan (Compute) <mohan_parthasarathy@hpe.com>; linux-cxl@vger.kernel.org; Shiju Jose <shiju.jose@huawei.com>
> Subject: Re: Request for help on CXL kernel panic with recent QEMU/Linux
>
>
>
> On 5/4/25 1:22 AM, Parthasarathy, Mohan (Compute) wrote:
>> Hi all,
>>
>> Can anyone take a look and see if this a known issue ? Also, any tips on whether the issue is likely with my Linux version or QEMU ? I can share more details if required but just wanted to know if this looks obvious to expert eyes.
>
> kernel version?
>
> Also running ./scripts/faddr2line on cxl_internal_send_cmd+0x3c/0xf0 and devm_cxl_setup_features.cold+0x43/0x43 would be helpful.
>
> I've not seen that on my qemu setup with 6.15-rc4. I'm also using upstream qemu. So your kernel version and qemu version and passed in parameters would be helpful.
>
> Shiju,
> Have you encountered anything like this with your Features testing with RAS on qemu?
>
>>
>> Regards,
>> Mohan
>>
>>
>>
>> [ 57.988032] ------------[ cut here ]------------
>> [ 57.990637] memcpy: detected buffer overflow: 96 byte write of buffer size 0
>> [ 57.994123] WARNING: CPU: 0 PID: 46 at lib/string_helpers.c:1032 __fortify_report+0x55/0xa0
>> [ 58.001055] Modules linked in: cxl_pci i2c_i801(+) irqbypass vfat pcspkr fat i2c_smbus mctp_i2c(+) parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
>> [ 58.016135] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Not tainted 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
>> [ 58.021711] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
>> [ 58.025755] Workqueue: async async_run_entry_fn
>> [ 58.029028] RIP: 0010:__fortify_report+0x55/0xa0
>> [ 58.032915] Code: 01 48 8b 34 c5 20 1f 73 b9 48 c7 c1 06 58 f2 b9 48 c7 c0 fc 57 f2 b9 48 0f 44 c8 4c 89 ca 48 c7 c7 d8 ef e3 b9 e8 bb 2e 80 ff <0f> 0b 48 83 c4 20 c3 cc cc cc cc 48 89 74 24 10 48 89 c6 89 7c 24
>> [ 58.039451] RSP: 0018:ffffd248801a3a38 EFLAGS: 00010246
>> [ 58.047157] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
>> [ 58.053599] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
>> [ 58.059967] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
>> [ 58.064773] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
>> [ 58.075635] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
>> [ 58.084667] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
>> [ 58.096028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 58.106050] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
>> [ 58.117482] Call Trace:
>> [ 58.121907] <TASK>
>> [ 58.129551] ? cxl_internal_send_cmd+0x3c/0xf0 [cxl_core]
>> [ 58.139570] __fortify_panic+0xd/0xf
>> [ 58.146273] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
>> [ 58.153161] cxl_pci_probe+0x431/0xa90 [cxl_pci]
>> [ 58.158287] ? kernfs_xattr_get+0x3b/0x70
>> [ 58.161167] ? selinux_kernfs_init_security+0x74/0x250
>> [ 58.167922] ? try_to_wake_up+0x7f/0x760
>> [ 58.170137] local_pci_probe+0x42/0x90
>> [ 58.172399] pci_device_probe+0xda/0x2b0
>> [ 58.177444] ? sysfs_do_create_link_sd+0x6d/0xd0
>> [ 58.182205] really_probe+0xde/0x340
>> [ 58.190234] ? pm_runtime_barrier+0x55/0x90
>> [ 58.192903] __driver_probe_device+0x78/0x140
>> [ 58.197956] driver_probe_device+0x1f/0xa0
>> [ 58.203673] __driver_attach_async_helper+0x5e/0xe0
>> [ 58.208474] async_run_entry_fn+0x34/0x130
>> [ 58.217941] process_one_work+0x18e/0x350
>> [ 58.221932] worker_thread+0x25a/0x3a0
>> [ 58.223804] ? __pfx_worker_thread+0x10/0x10
>> [ 58.229040] kthread+0xfc/0x240
>> [ 58.237142] ? __pfx_kthread+0x10/0x10
>> [ 58.246321] ret_from_fork+0x34/0x50
>> [ 58.253927] ? __pfx_kthread+0x10/0x10
>> [ 58.261905] ret_from_fork_asm+0x1a/0x30
>> [ 58.267821] </TASK>
>> [ 58.269775] ---[ end trace 0000000000000000 ]---
>> [ 58.274065] ------------[ cut here ]------------
>> [ 58.282586] kernel BUG at lib/string_helpers.c:1040!
>> [ 58.293976] Oops: invalid opcode: 0000 [#1] SMP NOPTI
>> [ 58.299430] audit: type=1130 audit(1746252020.305:32): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-random-seed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
>> [ 58.299474] CPU: 0 UID: 0 PID: 46 Comm: kworker/u16:2 Tainted: G W 6.15.0-rc4-mohan+ #4 PREEMPT(voluntary)
>> [ 58.313086] Tainted: [W]=WARN
>> [ 58.317049] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
>> [ 58.322714] Workqueue: async async_run_entry_fn
>> [ 58.329051] RIP: 0010:__fortify_panic+0xd/0xf
>> [ 58.332500] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
>> [ 58.339956] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
>> [ 58.348114] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
>> [ 58.356607] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
>> [ 58.360981] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
>> [ 58.366267] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
>> [ 58.369804] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
>> [ 58.376177] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
>> [ 58.380150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 58.384364] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
>> [ 58.387660] Call Trace:
>> [ 58.390086] <TASK>
>> [ 58.392804] devm_cxl_setup_features.cold+0x43/0x43 [cxl_core]
>> [ 58.395791] cxl_pci_probe+0x431/0xa90 [cxl_pci]
>> [ 58.409127] ? kernfs_xattr_get+0x3b/0x70
>> [ 58.415392] ? selinux_kernfs_init_security+0x74/0x250
>> [ 58.420775] ? try_to_wake_up+0x7f/0x760
>> [ 58.423879] local_pci_probe+0x42/0x90
>> [ 58.429026] pci_device_probe+0xda/0x2b0
>> [ 58.433175] ? sysfs_do_create_link_sd+0x6d/0xd0
>> [ 58.438630] really_probe+0xde/0x340
>> [ 58.440769] ? pm_runtime_barrier+0x55/0x90
>> [ 58.442846] __driver_probe_device+0x78/0x140
>> [ 58.445598] driver_probe_device+0x1f/0xa0
>> [ 58.448532] __driver_attach_async_helper+0x5e/0xe0
>> [ 58.451848] async_run_entry_fn+0x34/0x130
>> [ 58.456739] process_one_work+0x18e/0x350
>> [ 58.462118] worker_thread+0x25a/0x3a0
>> [ 58.467050] ? __pfx_worker_thread+0x10/0x10
>> [ 58.470596] kthread+0xfc/0x240
>> [ 58.474475] ? __pfx_kthread+0x10/0x10
>> [ 58.477836] ret_from_fork+0x34/0x50
>> [ 58.480791] ? __pfx_kthread+0x10/0x10
>> [ 58.484168] ret_from_fork_asm+0x1a/0x30
>> [ 58.487363] </TASK>
>> [ 58.490697] Modules linked in: cxl_pci i2c_i801 irqbypass vfat pcspkr fat i2c_smbus mctp_i2c parport_pc(+) cxl_acpi i2c_mux parport cxl_port cxl_core e1000e einj lpc_ich bochs loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock zram vmw_vmci qemu_fw_cfg serio_raw scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
>> [ 58.505259] ---[ end trace 0000000000000000 ]---
>> [ 58.509396] RIP: 0010:__fortify_panic+0xd/0xf
>> [ 58.512731] Code: e9 dc d9 95 00 e9 02 da 95 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 40 0f b6 ff e8 d3 f2 95 00 <0f> 0b 48 8b 54 24 10 48 8b 74 24 08 4c 89 e1 48 c7 c7 90 2e ef b9
>> [ 58.520925] RSP: 0018:ffffd248801a3a60 EFLAGS: 00010282
>> [ 58.524495] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000027
>> [ 58.528365] RDX: ffff88abbbc1ca88 RSI: 0000000000000001 RDI: ffff88abbbc1ca80
>> [ 58.532956] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffd248801a38d8
>> [ 58.536365] R10: ffffffffba939ac8 R11: 00000000ffffdfff R12: 0000000000000000
>> [ 58.540179] R13: 0000000000000000 R14: ffff88ab4007c800 R15: 0000000000000002
>> [ 58.546765] FS: 0000000000000000(0000) GS:ffff88ac0052b000(0000) knlGS:0000000000000000
>> [ 58.550843] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 58.554470] CR2: 00007fbd45b4b058 CR3: 0000000115109000 CR4: 00000000000006f0
>> [ 59.773090] iTCO_vendor_support: vendor-support=0
>>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2025-05-08 19:05 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-05-04 8:22 Request for help on CXL kernel panic with recent QEMU/Linux Parthasarathy, Mohan (Compute)
2025-05-05 4:33 ` Fan Ni
2025-05-05 15:18 ` Dave Jiang
2025-05-08 14:27 ` Parthasarathy, Mohan (Compute)
2025-05-08 19:05 ` Dave Jiang
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox