Hi Dengke, The fix for the kernel was pulled into linux-master KH[1]
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9c0be3f6b5d776dfe3ed249862c244a4486414dc The corresponding changes for lttng-modules were merged and backported (2.9, 2.10, 2.11). [2] https://github.com/lttng/lttng-modules/commit/c1b0a62512c0dad3c79f3eb29ed29d3a702f2274 Again thanks again for reporting this issue. Cheers On Fri, Oct 12, 2018 at 12:21:18PM -0400, Jonathan Rajotte-Julien wrote: > Hi Dengke, > > We were able to reproduce it. This is not related to yocto and seems to be > related to a change introduced in the 4.19 kernel. > > If you are not interested in kernel tracing you can pass the --no-kernel flag > to > lttng-sessiond to prevent the loading of the kernel modules. > > We are looking into the root problem and possible fix on either the kernel > side > or ours. > > Thanks for reporting the issue. We will keep you updated. > > Cheers > > On Fri, Oct 12, 2018 at 11:10:09AM -0400, Mathieu Desnoyers wrote: > > ----- On Oct 11, 2018, at 9:21 PM, Dengke Du dengke...@windriver.com wrote: > > > > > On 2018年10月11日 21:22, Jonathan Rajotte-Julien wrote: > > >> Hi, > > >> > > >> On Thu, Oct 11, 2018 at 02:00:11PM +0800, Dengke Du wrote: > > >>> Hi all > > >>> > > >>> When I create a local trace session, meeting a call trace: > > >>> > > >>> uname -a: > > >>> > > >>> Linux qemux86-64 4.19.0-rc7-yoctodev-standard #1 SMP PREEMPT Thu Oct 11 > > >>> 03:32:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux > > >> Which yocto branch, recipes(for kernel, lttng-tools, lttng-modules) and > > >> target? > > >> > > >> Which version of lttng-modules are you using? > > > > Please answer the questions above as well. > > > > Thanks, > > > > Mathieu > > > > > > >> > > >> Any modification to the kernel? > > > > > > Yocto: master branch > > > Kernel: linux-yocto-dev > > > > > > phenomenon 1: > > > linux-yocto was ok (v4.18) > > > phenomenon 2: > > > linux-yocto-dev was not ok (v4.19) > > > > > > Maybe some kernel commit breaks it. > > > > > >> > > >>> lttng create trace_session --live -U net://127.0.0.1 > > >>> > > >>> ---------------------------------------------------------------------------------------------------------- > > >>> > > >>> [ 222.390601] lttng_kretprobes: loading out-of-tree module taints > > >>> kernel. > > >>> [ 223.550725] BUG: unable to handle kernel paging request at > > >>> 0000111400001158 > > >>> [ 223.551661] PGD 0 P4D 0 > > >>> [ 223.552476] Oops: 0000 [#1] PREEMPT SMP PTI > > >>> [ 223.553170] CPU: 0 PID: 500 Comm: modprobe Tainted: G O > > >>> 4.19.0-rc7-yoctodev-standard #1 > > >>> [ 223.553892] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > > >>> BIOS > > >>> rel-1.11.2-0-gf9626ccb91-prebuilt.qemu-project.org 04/01/2014 > > >>> [ 223.556619] RIP: 0010:lttng_tracepoint_notify+0x16e/0x200 > > >>> [lttng_tracer] > > >>> [ 223.557751] Code: eb bd 48 39 c1 0f 85 a3 00 00 00 49 8b 55 10 41 83 > > >>> c4 > > >>> 01 44 39 a2 8c 02 00 00 76 a3 48 8b 92 90 02 00 00 49 63 c4 48 8b 0c c2 > > >>> <4c> > > >>> 8b 31 48 89 4d d0 4c 89 f7 e8 90 > > >>> [ 223.559769] RSP: 0000:ffffa39a00373bc0 EFLAGS: 00000206 > > >>> [ 223.560303] RAX: 0000000000000000 RBX: ffff9b3dd45a83a0 RCX: > > >>> 0000111400001158 > > >>> [ 223.560959] RDX: ffffffffc01b9048 RSI: 0000000000000001 RDI: > > >>> ffffffffc02f1100 > > >>> [ 223.561579] RBP: ffffa39a00373bf0 R08: 0000000000000064 R09: > > >>> ffff9b3ddec01600 > > >>> [ 223.562388] R10: ffffffffc0287411 R11: ffffffff98dc9660 R12: > > >>> 0000000000000000 > > >>> [ 223.563008] R13: ffff9b3dd45a83a0 R14: ffffa39a00373e78 R15: > > >>> 0000000000000002 > > >>> [ 223.563905] FS: 00007fb049015740(0000) GS:ffff9b3ddf200000(0000) > > >>> knlGS:0000000000000000 > > >>> [ 223.564941] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > >>> [ 223.565501] CR2: 0000111400001158 CR3: 0000000014586000 CR4: > > >>> 00000000000006f0 > > >>> [ 223.566450] Call Trace: > > >>> [ 223.568367] ? lttng_kernel_tracepoint_add+0x50/0xc0 [lttng_tracer] > > >>> [ 223.569932] register_tracepoint_module_notifier+0x57/0x80 > > >>> [ 223.571309] ? 0xffffffffc0309000 > > >>> [ 223.572187] lttng_tracepoint_init+0x45/0xbf9 [lttng_tracer] > > >>> [ 223.573125] lttng_events_init+0x40/0x1cc [lttng_tracer] > > >>> [ 223.573820] ? 0xffffffffc0309000 > > >>> [ 223.574237] do_one_initcall+0x53/0x1fe > > >>> [ 223.574682] ? __vunmap+0x8e/0xc0 > > >>> [ 223.575196] ? kmem_cache_alloc_trace+0xfc/0x1d0 > > >>> [ 223.575684] ? do_init_module+0x27/0x210 > > >>> [ 223.576285] do_init_module+0x60/0x210 > > >>> [ 223.576702] load_module+0x2406/0x2570 > > >>> [ 223.577140] ? vfs_read+0x115/0x140 > > >>> [ 223.577611] ? vfs_read+0x115/0x140 > > >>> [ 223.578034] __se_sys_finit_module+0xc3/0xe0 > > >>> [ 223.578581] ? __se_sys_finit_module+0xc3/0xe0 > > >>> [ 223.579135] __x64_sys_finit_module+0x1a/0x20 > > >>> [ 223.579627] do_syscall_64+0x4d/0xf0 > > >>> [ 223.580071] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > >>> [ 223.580837] RIP: 0033:0x7fb049107569 > > >>> [ 223.581286] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 > > >>> 48 > > >>> 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 > > >>> <48> > > >>> 3d 01 f0 ff ff 73 01 c3 48 8b 08 > > >>> [ 223.583210] RSP: 002b:00007ffc80620498 EFLAGS: 00000246 ORIG_RAX: > > >>> 0000000000000139 > > >>> [ 223.583958] RAX: ffffffffffffffda RBX: 000055931b680b70 RCX: > > >>> 00007fb049107569 > > >>> [ 223.584677] RDX: 0000000000000000 RSI: 000055931b67734e RDI: > > >>> 000000000000000a > > >>> [ 223.585372] RBP: 0000000000000000 R08: 0000000000000000 R09: > > >>> 000055931b680b70 > > >>> [ 223.586008] R10: 000000000000000a R11: 0000000000000246 R12: > > >>> 000055931b67734e > > >>> [ 223.586696] R13: 0000000000040000 R14: 0000000000000000 R15: > > >>> 0000000000000000 > > >>> [ 223.587620] Modules linked in: lttng_tracer(O+) lttng_statedump(O) > > >>> lttng_ftrace(O) lttng_kprobes(O) lttng_clock(O) lttng_lib_ring_buffer(O) > > >>> lttng_kretprobes(O) deflate twofish_geneb > > >>> [ 223.597615] CR2: 0000111400001158 > > >>> [ 223.614673] ---[ end trace 514884c3611a01af ]--- > > >>> [ 223.615793] RIP: 0010:lttng_tracepoint_notify+0x16e/0x200 > > >>> [lttng_tracer] > > >>> [ 223.616604] Code: eb bd 48 39 c1 0f 85 a3 00 00 00 49 8b 55 10 41 83 > > >>> c4 > > >>> 01 44 39 a2 8c 02 00 00 76 a3 48 8b 92 90 02 00 00 49 63 c4 48 8b 0c c2 > > >>> <4c> > > >>> 8b 31 48 89 4d d0 4c 89 f7 e8 90 > > >>> [ 223.624684] RSP: 0000:ffffa39a00373bc0 EFLAGS: 00000206 > > >>> [ 223.625177] RAX: 0000000000000000 RBX: ffff9b3dd45a83a0 RCX: > > >>> 0000111400001158 > > >>> [ 223.626102] RDX: ffffffffc01b9048 RSI: 0000000000000001 RDI: > > >>> ffffffffc02f1100 > > >>> [ 223.632541] RBP: ffffa39a00373bf0 R08: 0000000000000064 R09: > > >>> ffff9b3ddec01600 > > >>> [ 223.633110] R10: ffffffffc0287411 R11: ffffffff98dc9660 R12: > > >>> 0000000000000000 > > >>> [ 223.637690] R13: ffff9b3dd45a83a0 R14: ffffa39a00373e78 R15: > > >>> 0000000000000002 > > >>> [ 223.641583] FS: 00007fb049015740(0000) GS:ffff9b3ddf200000(0000) > > >>> knlGS:0000000000000000 > > >>> [ 223.642238] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > >>> [ 223.642906] CR2: 00007f6eae3e4b58 CR3: 0000000014586000 CR4: > > >>> 00000000000006f0 > > >>> 2018 Oct 11 05:37:07 qemux86-64 [ 223.550725] BUG: unable to handle > > >>> kernel > > >>> paging request at 0000111400001158 > > >>> 2018 Oct 11 05:37:07 qemux86-64 BUG: unable to handle kernel paging > > >>> request > > >>> at 0000111400001158 > > >>> > > >>> ---------------------------------------------------------------------------------------------------------- > > >>> > > >>> When I type that command again: > > >>> > > >>> ---------------------------------------------------------------------------------------------------------- > > >>> > > >>> Spawning a session daemon > > >>> Error: Session daemon terminated with an error (exit status: 1) > > >>> Error: Problem occurred while launching session daemon > > >>> (/usr/bin/lttng-sessiond) > > >>> Error: Command error > > >>> > > >>> ---------------------------------------------------------------------------------------------------------- > > >>> > > >>> > > >>> _______________________________________________ > > >>> lttng-dev mailing list > > >>> lttng-dev@lists.lttng.org > > >>> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > > > > _______________________________________________ > > > lttng-dev mailing list > > > lttng-dev@lists.lttng.org > > > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > > -- > > Mathieu Desnoyers > > EfficiOS Inc. > > http://www.efficios.com > > -- > Jonathan Rajotte-Julien > EfficiOS > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev -- Jonathan Rajotte-Julien EfficiOS 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