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Message-ID: <Zic0ot5aGgR-V4Ks@thinkpad2021> Date: Tue, 23 Apr 2024 00:10:10 -0400 From: "John B. Wyatt IV" <jwyatt@...hat.com> To: Raju Rangoju <rajur@...lsio.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de> Cc: Juri Lelli <jlelli@...hat.com>, Clark Williams <williams@...hat.com>, netdev <netdev@...r.kernel.org>, kernel-rts-sst <kernel-rts-sst@...hat.com>, LKML <linux-kernel@...r.kernel.org> Subject: net: cxgb4: Call Trace reported with PREEMPT_RT: BUG: using smp_processor_id() in preemptible [00000000] code: ethtool/78718 Hello Raju, Hello Sebastian, Red Hat QE found this issue with cxgb4 only when the kernel has PREEMPT_RT set with the preempt-rt patchset: git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git We are also seeing this in the Real-time builds of RHEL9 and 8. The specific build is an internal build that was pulled from the mirror Clark Williams setup for Fedora and RHEL testing. https://gitlab.com/cki-project/kernel-ark/-/tree/os-build-rt?ref_type=heads We use the branch: os-build-rt I was unable to find the cause of this and I thought I should report it. Please let me if you have any questions or you need any testing done. Call trace is below: kernel-rt-6.9.0-0.rc4.f8dba31b0a82.38.test.eln136.x86_64 BUG: using smp_processor_id() in preemptible [00000000] code: ethtool/78718 caller is cxgb4_selftest_lb_pkt+0x3d/0x3a0 cxgb4 Hardware name: Dell Inc. PowerEdge R750/0WT8Y6, BIOS 1.5.4 12/17/2021 Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:116) check_preemption_disabled (lib/smp_processor_id.c:49) cxgb4_selftest_lb_pkt+0x3d/0x3a0 cxgb4 cxgb4_self_test+0x8f/0xe0 cxgb4 ethtool_self_test (net/ethtool/ioctl.c:2002) __dev_ethtool (net/ethtool/ioctl.c:2997) ? migrate_enable (./include/linux/preempt.h:480 (discriminator 3) ./include/linux/preempt.h:480 (discriminator 3) kernel/sched/core.c:2472 (discriminator 3)) ? kmalloc_trace (./arch/x86/include/asm/jump_label.h:55 ./include/linux/memcontrol.h:1839 mm/slub.c:1980 mm/slub.c:3807 mm/slub.c:3845 mm/slub.c:3992) dev_ethtool (net/ethtool/ioctl.c:3177) dev_ioctl (net/core/dev_ioctl.c:724) sock_do_ioctl (net/socket.c:1236) __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:904 fs/ioctl.c:890 fs/ioctl.c:890) do_syscall_64 (arch/x86/entry/common.c:52 (discriminator 1) arch/x86/entry/common.c:83 (discriminator 1)) ? mod_objcg_state (mm/memcontrol.c:3421) ? migrate_enable (./include/linux/preempt.h:480 (discriminator 3) ./include/linux/preempt.h:480 (discriminator 3) kernel/sched/core.c:2472 (discriminator 3)) ? try_charge_memcg (mm/memcontrol.c:2745) ? __mod_node_page_state (./include/linux/preempt.h:477 (discriminator 3) mm/vmstat.c:405 (discriminator 3)) ? migrate_enable (./include/linux/preempt.h:480 (discriminator 3) ./include/linux/preempt.h:480 (discriminator 3) kernel/sched/core.c:2472 (discriminator 3)) ? rt_spin_unlock (kernel/locking/rtmutex.c:230 (discriminator 5) kernel/locking/spinlock_rt.c:84 (discriminator 5)) ? do_anonymous_page (./include/linux/pgtable.h:114 mm/memory.c:4490) ? __handle_mm_fault (mm/memory.c:3878 mm/memory.c:5300 mm/memory.c:5441) ? syscall_exit_to_user_mode (kernel/entry/common.c:221) ? __count_memcg_events (./include/linux/preempt.h:477 (discriminator 3) mm/memcontrol.c:704 (discriminator 3) mm/memcontrol.c:963 (discriminator 3)) ? handle_mm_fault (mm/memory.c:5483 mm/memory.c:5622) ? do_user_addr_fault (arch/x86/mm/fault.c:1443 (discriminator 1)) ? clear_bhb_loop (arch/x86/entry/entry_64.S:1539) ? clear_bhb_loop (arch/x86/entry/entry_64.S:1539) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) RIP: 0033:0x7f55216c557b Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 75 68 0f 00 f7 d8 64 89 01 48 All code ======== 0: ff (bad) 1: ff (bad) 2: ff 85 c0 79 9b 49 incl 0x499b79c0(%rbp) 8: c7 c4 ff ff ff ff mov $0xffffffff,%esp e: 5b pop %rbx f: 5d pop %rbp 10: 4c 89 e0 mov %r12,%rax 13: 41 5c pop %r12 15: c3 ret 16: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 1d: 00 00 1f: f3 0f 1e fa endbr64 23: b8 10 00 00 00 mov $0x10,%eax 28: 0f 05 syscall 2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 8b 0d 75 68 0f 00 mov 0xf6875(%rip),%rcx # 0xf68af 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax 6: 73 01 jae 0x9 8: c3 ret 9: 48 8b 0d 75 68 0f 00 mov 0xf6875(%rip),%rcx # 0xf6885 10: f7 d8 neg %eax 12: 64 89 01 mov %eax,%fs:(%rcx) 15: 48 rex.W RSP: 002b:00007ffd867a78f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffd867a7980 RCX: 00007f55216c557b RDX: 00007ffd867a7990 RSI: 0000000000008946 RDI: 0000000000000003 RBP: 0000556fe43632e0 R08: 0000000000000003 R09: 0000000000000001 R10: 0000000000000fff R11: 0000000000000246 R12: 0000556fe43632a0 R13: 0000000000000018 R14: 0000000000000001 R15: 0000000000000000 </TASK> -- Sincerely, John Wyatt Software Engineer, Core Kernel Red Hat
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