[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Xen NIC driver have page_pool memory leaks
Hi Arthur, (Answer inlined below, which is custom on this mailing list) On 23/03/2024 14.23, Arthur Borsboom wrote: Hi Jesper, After a recent kernel upgrade 6.7.6 > 6.8.1 all my Xen guests on Arch Linux are dumping kernel traces. It seems to be indirectly caused by the page pool memory leak mechanism, which is probably a good thing. I have created a bug report, but there is no response. https://bugzilla.kernel.org/show_bug.cgi?id=218618 I am uncertain where and to whom I need to report this page leak. Can you help me get this issue fixed? I'm the page_pool maintainer, but as you say yourself in comment 2 then since dba1b8a7ab68 ("mm/page_pool: catch page_pool memory leaks") this indicated there is a problem in the xen_netfront driver, which was previously not visible. Cc'ing the "XEN NETWORK BACKEND DRIVER" maintainers, as this is a driver bug. What confuses me it that I cannot find any modules named "xen_netfront" in the upstream tree. IPSEC recently had a similar leak bug. That was fixed in commmit [1] c3198822c6cb ("net: esp: fix bad handling of pages from page_pool"). This xen_netfront driver likely needs a similar fix. --Jesper [1] https://git.kernel.org/torvalds/c/c3198822c6cb Text copied from bugzilla.kernel.org: ------------------------------------- [88847.284348] Call Trace: [88847.284354] <IRQ> [88847.284361] dump_stack_lvl+0x47/0x60 [88847.284378] bad_page+0x71/0x100 [88847.284393] free_unref_page_prepare+0x236/0x390 [88847.284405] free_unref_page+0x34/0x180 [88847.284416] __pskb_pull_tail+0x3ff/0x4a0[88847.284432] xennet_poll+0x909/0xa40 [xen_netfront 12c02fdcf84c692965d9cd6ca5a6ff0a530b4ce9] [88847.284470] __napi_poll+0x28/0x1b0 [88847.284483] net_rx_action+0x2b5/0x370 [88847.284495] ? handle_irq_desc+0x3e/0x60 [88847.284511] __do_softirq+0xc9/0x2c8 [88847.284523] __irq_exit_rcu+0xa3/0xc0 [88847.284536] sysvec_xen_hvm_callback+0x72/0x90 [88847.284545] </IRQ> [88847.284549] <TASK> [88847.284552] asm_sysvec_xen_hvm_callback+0x1a/0x20 [88847.284562] RIP: 0010:pv_native_safe_halt+0xf/0x20[88847.284572] Code: 22 d7 c3 cc cc cc cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 13 27 00 fb f4 <c3> cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 [88847.284579] RSP: 0018:ffffb2a1800c3e58 EFLAGS: 00000246[88847.284587] RAX: 0000000000004000 RBX: ffff91358033b864 RCX: 000051404aebd79d [88847.284594] RDX: ffff9136f9b00000 RSI: ffff91358033b800 RDI: 0000000000000001 [88847.284599] RBP: ffff91358033b864 R08: ffffffff9b94dca0 R09: 0000000000000001 [88847.284604] R10: 0000000000000018 R11: ffff9136f9b331a4 R12: ffffffff9b94dca0 [88847.284609] R13: ffffffff9b94dd20 R14: 0000000000000001 R15: 0000000000000000 [88847.284623] acpi_safe_halt+0x15/0x30 [88847.284634] acpi_idle_do_entry+0x2f/0x50 [88847.284644] acpi_idle_enter+0x7f/0xd0 [88847.284655] cpuidle_enter_state+0x81/0x440 [88847.284667] cpuidle_enter+0x2d/0x40 [88847.284678] do_idle+0x1d8/0x230 [88847.284688] cpu_startup_entry+0x2a/0x30 [88847.284695] start_secondary+0x11e/0x140 [88847.284705] secondary_startup_64_no_verify+0x184/0x18b [88847.284725] </TASK>
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