----- On Mar 18, 2022, at 10:34 AM, lttng-dev lttng-dev@lists.lttng.org wrote:
> Hey all, > > in the past lttng-modules used to work on archlinux. But with a current > kernel, I cannot get it to work anymore. Has anyone an idea what is going on > here? > > I compiled and installed lttng-modules from the latest git, which works fine. > > ``` > make > sudo make modules_install > sudo depmod -a > ``` > > But loading the kernel modules then fails like this: > > ``` > lttng-sessiond > Error: Unable to load required module lttng-ring-buffer-client-discard > Warning: No kernel tracer available > ``` > > In dmesg I see the following output then, and I wonder if I'm doing something > obviously wrong? > > ``` > [16245.772646] Spectre V2 : System may be vulnerable to spectre v2 > [16245.772653] lttng_uprobes: loading module not compiled with retpoline > compiler. Hi Milian, I suspect you need to use the same compiler (a compiler that supports retpoline Spectre v2 mitigation) to compile lttng-modules as was used to compile your kernel. I suspect the kernel rejects those modules because they are compiled with a different compiler than your Linux kernel. Thanks, Mathieu > [16245.773120] sysfs: cannot create duplicate filename '/module/lttng_uprobes/ > sections/.note.gnu.property' > [16245.773124] CPU: 11 PID: 96193 Comm: lttng-sessiond Tainted: PF OE > 5.16.15-arch1-1 #1 670d2d5f7504498b520804dd7ff7fca01cc55e90 > [16245.773129] Hardware name: LENOVO 20Y30018GE/20Y30018GE, BIOS N40ET32W > (1.14 ) 01/03/2022 > [16245.773131] Call Trace: > [16245.773134] <TASK> > [16245.773138] dump_stack_lvl+0x48/0x5e > [16245.773147] sysfs_warn_dup.cold+0x17/0x24 > [16245.773155] sysfs_add_bin_file_mode_ns+0xae/0xc0 > [16245.773160] internal_create_group+0x1ce/0x390 > [16245.773165] mod_sysfs_setup+0x4e1/0x720 > [16245.773171] load_module+0x25e8/0x27e0 > [16245.773178] ? __do_sys_init_module+0x12e/0x1b0 > [16245.773181] __do_sys_init_module+0x12e/0x1b0 > [16245.773185] do_syscall_64+0x59/0x80 > [16245.773189] ? syscall_exit_to_user_mode+0x23/0x40 > [16245.773193] ? do_syscall_64+0x69/0x80 > [16245.773195] ? syscall_exit_to_user_mode+0x23/0x40 > [16245.773198] ? do_syscall_64+0x69/0x80 > [16245.773200] ? do_user_addr_fault+0x1d7/0x690 > [16245.773205] ? exc_page_fault+0x72/0x170 > [16245.773208] entry_SYSCALL_64_after_hwframe+0x44/0xae > [16245.773213] RIP: 0033:0x7f32283b06ae > [16245.773216] Code: 48 8b 0d ed 66 0e 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e > 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d > 01 f0 ff ff 73 01 c3 48 8b 0d ba 66 0e 00 f7 d8 64 89 01 48 > [16245.773219] RSP: 002b:00007fff964fc8c8 EFLAGS: 00000246 ORIG_RAX: > 00000000000000af > [16245.773223] RAX: ffffffffffffffda RBX: 0000559300c063d0 RCX: > 00007f32283b06ae > [16245.773224] RDX: 00007f322879732c RSI: 0000000000037320 RDI: > 00007f3224925010 > [16245.773226] RBP: 00007f3224925010 R08: 00007f32249c7000 R09: > 0000000000000000 > [16245.773228] R10: 0000000000037701 R11: 0000000000000246 R12: > 00007f322879732c > [16245.773230] R13: 0000559300c06380 R14: 0000000000000000 R15: > 0000559300c08670 > [16245.773233] </TASK> > [16245.774070] Spectre V2 : System may be vulnerable to spectre v2 > [16245.774075] lttng_kprobes: loading module not compiled with retpoline > compiler. > [16245.774608] sysfs: cannot create duplicate filename '/module/lttng_kprobes/ > sections/.note.gnu.property' > [16245.774611] CPU: 11 PID: 96193 Comm: lttng-sessiond Tainted: PF OE > 5.16.15-arch1-1 #1 670d2d5f7504498b520804dd7ff7fca01cc55e90 > [16245.774615] Hardware name: LENOVO 20Y30018GE/20Y30018GE, BIOS N40ET32W > (1.14 ) 01/03/2022 > [16245.774617] Call Trace: > [16245.774620] <TASK> > [16245.774622] dump_stack_lvl+0x48/0x5e > [16245.774630] sysfs_warn_dup.cold+0x17/0x24 > [16245.774636] sysfs_add_bin_file_mode_ns+0xae/0xc0 > [16245.774643] internal_create_group+0x1ce/0x390 > [16245.774648] mod_sysfs_setup+0x4e1/0x720 > [16245.774655] load_module+0x25e8/0x27e0 > [16245.774659] ? prepare_alloc_pages.constprop.0+0x7e/0x150 > [16245.774668] ? __do_sys_init_module+0x12e/0x1b0 > [16245.774671] __do_sys_init_module+0x12e/0x1b0 > [16245.774675] do_syscall_64+0x59/0x80 > [16245.774681] ? vfs_read+0xf1/0x190 > [16245.774686] ? syscall_exit_to_user_mode+0x23/0x40 > [16245.774690] ? do_syscall_64+0x69/0x80 > [16245.774692] ? exc_page_fault+0x72/0x170 > [16245.774696] entry_SYSCALL_64_after_hwframe+0x44/0xae > [16245.774700] RIP: 0033:0x7f32283b06ae > [16245.774703] Code: 48 8b 0d ed 66 0e 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e > 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d > 01 f0 ff ff 73 01 c3 48 8b 0d ba 66 0e 00 f7 d8 64 89 01 48 > [16245.774706] RSP: 002b:00007fff964fc8c8 EFLAGS: 00000246 ORIG_RAX: > 00000000000000af > [16245.774711] RAX: ffffffffffffffda RBX: 0000559300c06250 RCX: > 00007f32283b06ae > [16245.774713] RDX: 00007f322879732c RSI: 000000000002ee48 RDI: > 0000559300ca7440 > [16245.774714] RBP: 0000559300ca7440 R08: 0000000000000000 R09: > 0000000000000000 > [16245.774715] R10: 0000000000086551 R11: 0000000000000246 R12: > 00007f322879732c > [16245.774717] R13: 0000559300c06200 R14: 0000000000000000 R15: > 0000559300c06450 > [16245.774720] </TASK> > [16245.775610] Spectre V2 : System may be vulnerable to spectre v2 > [16245.775614] lttng_kretprobes: loading module not compiled with retpoline > compiler. > [16245.775873] sysfs: cannot create duplicate filename '/module/ > lttng_kretprobes/sections/.note.gnu.property' > [16245.775876] CPU: 11 PID: 96193 Comm: lttng-sessiond Tainted: PF OE > 5.16.15-arch1-1 #1 670d2d5f7504498b520804dd7ff7fca01cc55e90 > [16245.775881] Hardware name: LENOVO 20Y30018GE/20Y30018GE, BIOS N40ET32W > (1.14 ) 01/03/2022 > [16245.775882] Call Trace: > [16245.775885] <TASK> > [16245.775887] dump_stack_lvl+0x48/0x5e > [16245.775893] sysfs_warn_dup.cold+0x17/0x24 > [16245.775898] sysfs_add_bin_file_mode_ns+0xae/0xc0 > [16245.775904] internal_create_group+0x1ce/0x390 > [16245.775909] mod_sysfs_setup+0x4e1/0x720 > [16245.775915] load_module+0x25e8/0x27e0 > [16245.775922] ? __do_sys_init_module+0x12e/0x1b0 > [16245.775925] __do_sys_init_module+0x12e/0x1b0 > [16245.775929] do_syscall_64+0x59/0x80 > [16245.775933] ? do_user_addr_fault+0x1d7/0x690 > [16245.775938] ? exc_page_fault+0x72/0x170 > [16245.775942] entry_SYSCALL_64_after_hwframe+0x44/0xae > [16245.775947] RIP: 0033:0x7f32283b06ae > [16245.775951] Code: 48 8b 0d ed 66 0e 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e > 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d > 01 f0 ff ff 73 01 c3 48 8b 0d ba 66 0e 00 f7 d8 64 89 01 48 > [16245.775953] RSP: 002b:00007fff964fc8c8 EFLAGS: 00000246 ORIG_RAX: > 00000000000000af > [16245.775957] RAX: ffffffffffffffda RBX: 0000559300c060c0 RCX: > 00007f32283b06ae > [16245.775959] RDX: 00007f322879732c RSI: 0000000000032190 RDI: > 0000559300d1ad20 > [16245.775961] RBP: 0000559300d1ad20 R08: 0000000000000000 R09: > 0000000000000000 > [16245.775962] R10: 000000000000138b R11: 0000000000000246 R12: > 00007f322879732c > [16245.775964] R13: 0000559300c06070 R14: 0000000000000000 R15: > 0000559300c086c0 > [16245.775967] </TASK> > [16245.781844] Spectre V2 : System may be vulnerable to spectre v2 > [16245.781851] lttng_lib_ring_buffer: loading module not compiled with > retpoline compiler. > [16245.782493] sysfs: cannot create duplicate filename '/module/ > lttng_lib_ring_buffer/sections/.text' > [16245.782497] CPU: 11 PID: 96193 Comm: lttng-sessiond Tainted: PF OE > 5.16.15-arch1-1 #1 670d2d5f7504498b520804dd7ff7fca01cc55e90 > [16245.782502] Hardware name: LENOVO 20Y30018GE/20Y30018GE, BIOS N40ET32W > (1.14 ) 01/03/2022 > [16245.782505] Call Trace: > [16245.782508] <TASK> > [16245.782517] dump_stack_lvl+0x48/0x5e > [16245.782528] sysfs_warn_dup.cold+0x17/0x24 > [16245.782534] sysfs_add_bin_file_mode_ns+0xae/0xc0 > [16245.782541] internal_create_group+0x1ce/0x390 > [16245.782546] mod_sysfs_setup+0x4e1/0x720 > [16245.782552] load_module+0x25e8/0x27e0 > [16245.782559] ? __do_sys_init_module+0x12e/0x1b0 > [16245.782562] __do_sys_init_module+0x12e/0x1b0 > [16245.782567] do_syscall_64+0x59/0x80 > [16245.782571] ? do_syscall_64+0x69/0x80 > [16245.782574] ? syscall_exit_to_user_mode+0x23/0x40 > [16245.782577] ? do_syscall_64+0x69/0x80 > [16245.782580] ? exc_page_fault+0x72/0x170 > [16245.782584] entry_SYSCALL_64_after_hwframe+0x44/0xae > [16245.782589] RIP: 0033:0x7f32283b06ae > [16245.782593] Code: 48 8b 0d ed 66 0e 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e > 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 af 00 00 00 0f 05 <48> 3d > 01 f0 ff ff 73 01 c3 48 8b 0d ba 66 0e 00 f7 d8 64 89 01 48 > [16245.782595] RSP: 002b:00007fff964fc8c8 EFLAGS: 00000246 ORIG_RAX: > 00000000000000af > [16245.782599] RAX: ffffffffffffffda RBX: 0000559300c05f30 RCX: > 00007f32283b06ae > [16245.782601] RDX: 00007f322879732c RSI: 0000000000188f58 RDI: > 00007f3224519010 > [16245.782602] RBP: 00007f3224519010 R08: 00007f322477c000 R09: > 0000000000000000 > [16245.782604] R10: 0000000000062ef1 R11: 0000000000000246 R12: > 00007f322879732c > [16245.782606] R13: 0000559300c05ee0 R14: 0000000000000000 R15: > 0000559300c08710 > [16245.782609] </TASK> > [16245.784406] Spectre V2 : System may be vulnerable to spectre v2 > [16245.784411] lttng_statedump: loading module not compiled with retpoline > compiler. > [16245.784546] lttng_statedump: Unknown symbol wrapper_kallsyms_lookup_name > (err -2) > [16245.784585] lttng_statedump: Unknown symbol wrapper_irq_to_desc (err -2) > [16246.003631] audit: type=1106 audit(1647613550.654:388): pid=96182 uid=1000 > auid=1000 ses=1 msg='op=PAM:session_close > grantors=pam_systemd_home,pam_limits,pam_unix,pam_permit acct="root" exe="/ > usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/6 res=success' > [16247.424446] Spectre V2 : System may be vulnerable to spectre v2 > [16247.424453] lttng_statedump: loading module not compiled with retpoline > compiler. > [16247.424612] lttng_statedump: Unknown symbol wrapper_kallsyms_lookup_name > (err -2) > [16247.424651] lttng_statedump: Unknown symbol wrapper_irq_to_desc (err -2) > ``` > > Thanks > -- > Milian Wolff | milian.wo...@kdab.com | Senior Software Engineer > KDAB (Deutschland) GmbH, a KDAB Group company > Tel: +49-30-521325470 > KDAB - The Qt, C++ and OpenGL Experts > _______________________________________________ > 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 _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
