I managed to narrow it down to this: trace-cmd start -e 'tlb:tlb_flush'
Seems to bug the kernel even if no cobalt thread is running, only a rt_igb and the rtnet stack. > -----Original Message----- > From: Xenomai <xenomai-boun...@xenomai.org> On Behalf Of Lange > Norbert via Xenomai > Sent: Montag, 17. Februar 2020 17:09 > To: Xenomai (xenomai@xenomai.org) <xenomai@xenomai.org> > Subject: Still some lockups when enabling ftrace > > NON-ANDRITZ SOURCE: BE CAUTIOUS WITH CONTENT, LINKS OR > ATTACHMENTS. > > > Hello, > > Enabling traces still can lockup Xenomai, apparently if any cobalt thread is > running. > > trace-cmd record -e all > > [11598.080137] I-pipe: Detected illicit call from head domain 'Xenomai' > [11598.080137] into a regular Linux service > [11598.091070] CPU: 3 PID: 948 Comm: sshd Not tainted 4.19.98-cip19- > xeno10-static #1 [11598.098531] Hardware name: TQ-Group > TQMxE39M/Type2 - Board Product Name, BIOS 5.12.30.21.18 04/12/2019 > [11598.107813] I-pipe domain: Xenomai [11598.111215] Call Trace: > [11598.113666] <IRQ> > [11598.115690] dump_stack+0x8c/0xc0 > [11598.119011] ipipe_stall_root+0xc/0x30 [11598.122768] > rcu_irq_enter_irqson+0x13/0x40 [11598.126947] > switch_mm_irqs_off+0x441/0x4e0 [11598.131132] > xnarch_switch_to+0x2b/0x70 [11598.134968] ___xnsched_run+0x1b6/0x480 > [11598.138806] xnintr_core_clock_handler+0x224/0x2f0 > [11598.143602] dispatch_irq_head+0x95/0x130 [11598.147622] > __ipipe_handle_irq+0x94/0x200 [11598.151730] > apic_timer_interrupt+0x12/0x40 [11598.155914] </IRQ> [11598.158021] RIP: > 0010:copy_user_generic_unrolled+0xb1/0xc0 > [11598.163513] Code: 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 > 74 > 10 89 d1 8a 06 88 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca <c3> 66 66 > 2e 0f 1f > 84 00 00 00 00 00 0f 1f 00 0f 2 [11598.182250] RSP: 0018:ffff95ffc0947c50 > EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [11598.189809] RAX: > 0000000000000000 RBX: 000000000000001e RCX: 0000000000000000 > [11598.196934] RDX: 0000000000000006 RSI: ffff95ffc006f2f0 RDI: > 00007fff3aa91f7e [11598.204055] RBP: ffff90d2f952a400 R08: > 726f63657220706f R09: 00007fff3aa91f60 [11598.211179] R10: > 000000000000095c R11: ffff90d2f3e1596c R12: ffff95ffc0947d40 > [11598.218306] R13: ffff95ffc006f000 R14: ffff95ffc0947d48 R15: > ffff95ffc006f2d2 [11598.225447] _copy_to_user+0x28/0x30 [11598.229027] > copy_from_read_buf+0x97/0x150 [11598.233127] n_tty_read+0x202/0x920 > [11598.236624] ? set_fd_set.part.0+0x37/0x40 [11598.240720] ? > core_sys_select+0x278/0x2d0 [11598.244818] ? rcu_all_qs+0x5/0x80 > [11598.248229] ? _cond_resched+0x15/0x30 [11598.251985] ? > ldsem_down_read+0x38/0x200 [11598.255997] ? > do_wait_intr_irq+0x90/0x90 [11598.260004] tty_read+0x83/0xf0 > [11598.263141] __vfs_read+0x34/0x180 [11598.266540] ? > trace_buffer_unlock_commit_regs+0x37/0x90 > [11598.271853] ? trace_event_buffer_commit+0x66/0x1d0 > [11598.276735] vfs_read+0x9d/0x150 > [11598.279968] ksys_read+0x57/0xd0 > [11598.283201] do_syscall_64+0x78/0x3d0 [11598.286864] ? > __do_page_fault+0x206/0x400 [11598.290954] > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > [11598.296000] RIP: 0033:0x7effc6e2c441 > [11598.299590] Code: Bad RIP value. > [11598.302820] RSP: 002b:00007fff3aa91f58 EFLAGS: 00000246 ORIG_RAX: > 0000000000000000 [11598.310371] RAX: ffffffffffffffda RBX: 00007effc6d1b2c0 > RCX: 00 > > > Mit besten Grüßen / Kind regards > > NORBERT LANGE > > AT-RD3 > > ANDRITZ HYDRO GmbH > Eibesbrunnergasse 20 > 1120 Vienna / AUSTRIA > p: +43 50805 56684 > norbert.la...@andritz.com<mailto:norbert.la...@andritz.com> > andritz.com<https://hes32- > ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.a > ndritz.com&umid=43f64137-0f9f-4732-84b1- > eb0d5e227769&auth=144056baf7302d777acad187aac74d4b9ba425e1- > da68bb35e4763b25686bf9bec4795991e92722be> > > ________________________________ > > This message and any attachments are solely for the use of the intended > recipients. 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