Hello! On Monday 20 March 2023 20:26:05 Jon Hunter wrote: > Hi Pali, > > After this change was made we are seeing the following bug > report on a Tegra234 Jetson Orin board ... > > [ 17.172346] tegra194-pcie 141a0000.pcie: host bridge /pcie@141a0000 ranges: > [ 17.172470] tegra194-pcie 141a0000.pcie: MEM 0x2800000000..0x2b27ffffff -> 0x2800000000 > [ 17.172519] tegra194-pcie 141a0000.pcie: MEM 0x2b28000000..0x2b2fffffff -> 0x0040000000 > [ 17.172548] tegra194-pcie 141a0000.pcie: IO 0x003a100000..0x003a1fffff -> 0x003a100000 > [ 17.173449] tegra194-pcie 141a0000.pcie: iATU: unroll T, 8 ob, 2 ib, align 64K, limit 32G > [ 18.279048] tegra194-pcie 141a0000.pcie: Phy link never came up > [ 19.279285] tegra194-pcie 141a0000.pcie: Phy link never came up > [ 19.279599] tegra194-pcie 141a0000.pcie: PCI host bridge to bus 0005:00 > [ 19.279613] pci_bus 0005:00: root bus resource [bus 00-ff] > [ 19.279622] pci_bus 0005:00: root bus resource [mem 0x2800000000-0x2b27ffffff pref] > [ 19.279631] pci_bus 0005:00: root bus resource [mem 0x2b28000000-0x2b2fffffff] (bus address [0x40000000-0x47ffffff]) > [ 19.279639] pci_bus 0005:00: root bus resource [io 0x200000-0x2fffff] (bus address [0x3a100000-0x3a1fffff]) > [ 19.279687] pci 0005:00:00.0: [10de:229a] type 01 class 0x060400 > [ 19.279886] pci 0005:00:00.0: PME# supported from D0 D3hot > [ 19.283256] pci 0005:00:00.0: PCI bridge to [bus 01-ff] > [ 19.283590] pcieport 0005:00:00.0: Adding to iommu group 26 > [ 19.283991] pcieport 0005:00:00.0: PME: Signaling with IRQ 174 > [ 19.284429] pcieport 0005:00:00.0: AER: enabled with IRQ 174 > [ 19.285003] pci_bus 0005:01: busn_res: [bus 01-ff] is released > [ 19.285591] pci 0005:00:00.0: Removing from iommu group 26 > [ 19.285751] pci_bus 0005:00: busn_res: [bus 00-ff] is released > [ 19.285870] ================================================================== > [ 19.293351] BUG: KFENCE: use-after-free read in pci_bus_release_domain_nr+0x10/0x70 > > [ 19.302817] Use-after-free read at 0x000000007f3b80eb (in kfence-#115): > [ 19.309677] pci_bus_release_domain_nr+0x10/0x70 > [ 19.309691] dw_pcie_host_deinit+0x28/0x78 > [ 19.309702] tegra_pcie_deinit_controller+0x1c/0x38 [pcie_tegra194] > [ 19.309734] tegra_pcie_dw_probe+0x648/0xb28 [pcie_tegra194] > [ 19.309752] platform_probe+0x90/0xd8 > [ 19.309764] really_probe+0xb8/0x298 > [ 19.309777] __driver_probe_device+0x78/0xd8 > [ 19.309788] driver_probe_device+0x38/0x120 > [ 19.309799] __device_attach_driver+0x94/0xe0 > [ 19.309812] bus_for_each_drv+0x70/0xc8 > [ 19.309822] __device_attach+0xfc/0x188 > [ 19.309833] device_initial_probe+0x10/0x18 > [ 19.309844] bus_probe_device+0x94/0xa0 > [ 19.309854] deferred_probe_work_func+0x80/0xb8 > [ 19.309864] process_one_work+0x1e0/0x348 > [ 19.309882] worker_thread+0x48/0x410 > [ 19.309891] kthread+0xf4/0x110 > [ 19.309904] ret_from_fork+0x10/0x20 > > [ 19.311457] kfence-#115: 0x00000000063a155a-0x00000000ba698da8, size=1072, cache=kmalloc-2k > > [ 19.311469] allocated by task 96 on cpu 10 at 19.279323s: > [ 19.311562] __kmem_cache_alloc_node+0x260/0x278 > [ 19.311571] kmalloc_trace+0x24/0x30 > [ 19.311580] pci_alloc_bus+0x24/0xa0 > [ 19.311590] pci_register_host_bridge+0x48/0x4b8 > [ 19.311601] pci_scan_root_bus_bridge+0xc0/0xe8 > [ 19.311613] pci_host_probe+0x18/0xc0 > [ 19.311623] dw_pcie_host_init+0x2c0/0x568 > [ 19.311630] tegra_pcie_dw_probe+0x610/0xb28 [pcie_tegra194] > [ 19.311647] platform_probe+0x90/0xd8 > [ 19.311653] really_probe+0xb8/0x298 > [ 19.311663] __driver_probe_device+0x78/0xd8 > [ 19.311672] driver_probe_device+0x38/0x120 > [ 19.311682] __device_attach_driver+0x94/0xe0 > [ 19.311694] bus_for_each_drv+0x70/0xc8 > [ 19.311702] __device_attach+0xfc/0x188 > [ 19.311713] device_initial_probe+0x10/0x18 > [ 19.311724] bus_probe_device+0x94/0xa0 > [ 19.311733] deferred_probe_work_func+0x80/0xb8 > [ 19.311743] process_one_work+0x1e0/0x348 > [ 19.311753] worker_thread+0x48/0x410 > [ 19.311763] kthread+0xf4/0x110 > [ 19.311771] ret_from_fork+0x10/0x20 > > [ 19.311782] freed by task 96 on cpu 10 at 19.285833s: > [ 19.311799] release_pcibus_dev+0x30/0x40 > [ 19.311808] device_release+0x30/0x90 > [ 19.311814] kobject_put+0xa8/0x120 > [ 19.311832] device_unregister+0x20/0x30 > [ 19.311839] pci_remove_bus+0x78/0x88 > [ 19.311850] pci_remove_root_bus+0x5c/0x98 > [ 19.311860] dw_pcie_host_deinit+0x28/0x78 > [ 19.311866] tegra_pcie_deinit_controller+0x1c/0x38 [pcie_tegra194] > [ 19.311883] tegra_pcie_dw_probe+0x648/0xb28 [pcie_tegra194] > [ 19.311900] platform_probe+0x90/0xd8 > [ 19.311906] really_probe+0xb8/0x298 > [ 19.311916] __driver_probe_device+0x78/0xd8 > [ 19.311926] driver_probe_device+0x38/0x120 > [ 19.311936] __device_attach_driver+0x94/0xe0 > [ 19.311947] bus_for_each_drv+0x70/0xc8 > [ 19.311956] __device_attach+0xfc/0x188 > [ 19.311966] device_initial_probe+0x10/0x18 > [ 19.311976] bus_probe_device+0x94/0xa0 > [ 19.311985] deferred_probe_work_func+0x80/0xb8 > [ 19.311995] process_one_work+0x1e0/0x348 > [ 19.312005] worker_thread+0x48/0x410 > [ 19.312014] kthread+0xf4/0x110 > [ 19.312022] ret_from_fork+0x10/0x20 Based on the above trace it looks like a double free of "pp->bridge" structure. Also, which kernel version are you using? Because from above third trace it looks like that dw_pcie_host_deinit() calls first pci_remove_root_bus() function and then (from first strace) it also calls pci_bus_release_domain_nr() function. Source code of the dw_pcie_host_deinit() is there: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/controller/dwc/pcie-designware-host.c But I do not see where dw_pcie_host_deinit() calls pci_bus_release_domain_nr() function as visible in the first trace. > [ 19.313579] CPU: 10 PID: 96 Comm: kworker/u24:2 Not tainted 6.2.0 #4 > [ 19.320171] Hardware name: /, BIOS 1.0-d7fb19b 08/10/2022 > [ 19.325852] Workqueue: events_unbound deferred_probe_work_func > [ 19.331919] ================================================================== > > After reverting this change I no longer see this issue. > Let me know if you have any thoughts. > > Thanks > Jon > -- > nvpublic
