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McKenney, we noticed in commit message "Not for mainline in its current form". we saw below commits in the branch: cdd5ddaa17fe fixup! EXP rcuscale: Dump debug info 4f60b8b679fd squash! EXP rcuscale: Dump debug info but we still observed same issue on the branch tip: fe09f037acf7 (dev.2024.07.17a) rcuscale: Make rcu_scale_writer() tolerate repeated GFP_KERNEL failure at the same time, we noticed there is no same title commit in newer branch: dev.2024.07.18a just still made below formal report to you since we are not sure if it could supply any useful information. if not, please just ignore. Thanks! Hello, kernel test robot noticed "WARNING:at_lib/alloc_tag.c:#alloc_tag_module_unload" on: commit: 9e146da3f351c0eaf66756cc3a6c6a5845b81187 ("EXP rcuscale: Dump debug info") https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2024.07.17a in testcase: rcuscale version: with following parameters: runtime: 300s scale_type: tasks-tracing compiler: gcc-13 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +-----------------------------------------------------+------------+------------+ | | e136892a8e | 9e146da3f3 | +-----------------------------------------------------+------------+------------+ | WARNING:at_lib/alloc_tag.c:#alloc_tag_module_unload | 0 | 12 | | EIP:alloc_tag_module_unload | 0 | 12 | +-----------------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202407251351.f65c33a0-lkp@intel.com [ 439.356638][ T1799] ------------[ cut here ]------------ [ 439.357183][ T1799] kernel/rcu/rcuscale.c:1037 module rcuscale func:rcu_scale_init has 8 allocated at module unload [ 439.357225][ T1799] WARNING: CPU: 0 PID: 1799 at lib/alloc_tag.c:168 alloc_tag_module_unload (lib/alloc_tag.c:168 (discriminator 1)) [ 439.358903][ T1799] Modules linked in: rcuscale(-) torture [last unloaded: rcuscale] [ 439.359632][ T1799] CPU: 0 PID: 1799 Comm: rmmod Not tainted 6.10.0-rc5-00110-g9e146da3f351 #1 308a8ed8688556473cf6c28b678fa76bc00dc1d7 [ 439.360679][ T1799] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 439.361546][ T1799] EIP: alloc_tag_module_unload (lib/alloc_tag.c:168 (discriminator 1)) [ 439.361993][ T1799] Code: 92 ff ff ff 8b 55 e8 8b 45 e4 85 d2 75 04 85 c0 74 21 52 50 ff 73 0c ff 73 08 ff 73 04 ff 73 10 68 d8 2f cb c2 e8 ec 39 9f ff <0f> 0b c6 45 d3 00 83 c4 1c 8d 45 d4 e8 2e fc ff ff 89 c3 eb b2 8a All code ======== 0: 92 xchg %eax,%edx 1: ff (bad) 2: ff (bad) 3: ff 8b 55 e8 8b 45 decl 0x458be855(%rbx) 9: e4 85 in $0x85,%al b: d2 75 04 shlb %cl,0x4(%rbp) e: 85 c0 test %eax,%eax 10: 74 21 je 0x33 12: 52 push %rdx 13: 50 push %rax 14: ff 73 0c push 0xc(%rbx) 17: ff 73 08 push 0x8(%rbx) 1a: ff 73 04 push 0x4(%rbx) 1d: ff 73 10 push 0x10(%rbx) 20: 68 d8 2f cb c2 push $0xffffffffc2cb2fd8 25: e8 ec 39 9f ff call 0xffffffffff9f3a16 2a:* 0f 0b ud2 <-- trapping instruction 2c: c6 45 d3 00 movb $0x0,-0x2d(%rbp) 30: 83 c4 1c add $0x1c,%esp 33: 8d 45 d4 lea -0x2c(%rbp),%eax 36: e8 2e fc ff ff call 0xfffffffffffffc69 3b: 89 c3 mov %eax,%ebx 3d: eb b2 jmp 0xfffffffffffffff1 3f: 8a .byte 0x8a Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: c6 45 d3 00 movb $0x0,-0x2d(%rbp) 6: 83 c4 1c add $0x1c,%esp 9: 8d 45 d4 lea -0x2c(%rbp),%eax c: e8 2e fc ff ff call 0xfffffffffffffc3f 11: 89 c3 mov %eax,%ebx 13: eb b2 jmp 0xffffffffffffffc7 15: 8a .byte 0x8a [ 439.363599][ T1799] EAX: 00000000 EBX: efbf9040 ECX: 00000000 EDX: 00000000 [ 439.364218][ T1799] ESI: c4215290 EDI: ebdfdedc EBP: ebdfdee8 ESP: ebdfde9c [ 439.364818][ T1799] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00210246 [ 439.365471][ T1799] CR0: 80050033 CR2: b71fd210 CR3: 04026300 CR4: 000406b0 [ 439.366083][ T1799] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 439.366676][ T1799] DR6: fffe0ff0 DR7: 00000400 [ 439.367170][ T1799] Call Trace: [ 439.367451][ T1799] ? show_regs (arch/x86/kernel/dumpstack.c:479 arch/x86/kernel/dumpstack.c:465) [ 439.367803][ T1799] ? alloc_tag_module_unload (lib/alloc_tag.c:168 (discriminator 1)) [ 439.368264][ T1799] ? __warn (kernel/panic.c:693) [ 439.368604][ T1799] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 439.368992][ T1799] ? alloc_tag_module_unload (lib/alloc_tag.c:168 (discriminator 1)) [ 439.369435][ T1799] ? exc_overflow (arch/x86/kernel/traps.c:252) [ 439.369807][ T1799] ? handle_bug (arch/x86/kernel/traps.c:239) [ 439.370162][ T1799] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1)) [ 439.370549][ T1799] ? handle_exception (arch/x86/entry/entry_32.S:1047) [ 439.371024][ T1799] ? exc_overflow (arch/x86/kernel/traps.c:252) [ 439.371397][ T1799] ? alloc_tag_module_unload (lib/alloc_tag.c:168 (discriminator 1)) [ 439.371843][ T1799] ? exc_overflow (arch/x86/kernel/traps.c:252) [ 439.372238][ T1799] ? alloc_tag_module_unload (lib/alloc_tag.c:168 (discriminator 1)) [ 439.372693][ T1799] codetag_unload_module (lib/codetag.c:238 (discriminator 1)) [ 439.373112][ T1799] free_module (kernel/module/main.c:1266) [ 439.373470][ T1799] __do_sys_delete_module+0x1b9/0x206 [ 439.373968][ T1799] __ia32_sys_delete_module (kernel/module/main.c:700) [ 439.374397][ T1799] ia32_sys_call (kbuild/obj/consumer/i386-randconfig-061-20240719/./arch/x86/include/generated/asm/syscalls_32.h:130) [ 439.374780][ T1799] do_int80_syscall_32 (arch/x86/entry/common.c:165 (discriminator 1) arch/x86/entry/common.c:339 (discriminator 1)) [ 439.375225][ T1799] entry_INT80_32 (arch/x86/entry/entry_32.S:944) [ 439.375611][ T1799] EIP: 0xb7f79092 [ 439.375910][ T1799] Code: 00 00 00 e9 90 ff ff ff ff a3 24 00 00 00 68 30 00 00 00 e9 80 ff ff ff ff a3 f8 ff ff ff 66 90 00 00 00 00 00 00 00 00 cd 80 8d b4 26 00 00 00 00 8d b6 00 00 00 00 8b 1c 24 c3 8d b4 26 00 All code ======== 0: 00 00 add %al,(%rax) 2: 00 e9 add %ch,%cl 4: 90 nop 5: ff (bad) 6: ff (bad) 7: ff (bad) 8: ff a3 24 00 00 00 jmp *0x24(%rbx) e: 68 30 00 00 00 push $0x30 13: e9 80 ff ff ff jmp 0xffffffffffffff98 18: ff a3 f8 ff ff ff jmp *-0x8(%rbx) 1e: 66 90 xchg %ax,%ax ... 28: cd 80 int $0x80 2a:* c3 ret <-- trapping instruction 2b: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 32: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi 38: 8b 1c 24 mov (%rsp),%ebx 3b: c3 ret 3c: 8d .byte 0x8d 3d: b4 26 mov $0x26,%ah ... Code starting with the faulting instruction =========================================== 0: c3 ret 1: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 8: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi e: 8b 1c 24 mov (%rsp),%ebx 11: c3 ret 12: 8d .byte 0x8d 13: b4 26 mov $0x26,%ah ... [ 439.377475][ T1799] EAX: ffffffda EBX: 00e4333c ECX: 00000800 EDX: 00484939 [ 439.378043][ T1799] ESI: 00e43300 EDI: 00e43300 EBP: bfbcdc46 ESP: bfbcccc4 [ 439.378610][ T1799] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00200202 [ 439.379237][ T1799] irq event stamp: 5473 [ 439.379574][ T1799] hardirqs last enabled at (5483): console_unlock (arch/x86/include/asm/irqflags.h:42 arch/x86/include/asm/irqflags.h:77 arch/x86/include/asm/irqflags.h:135 kernel/printk/printk.c:341 kernel/printk/printk.c:2746 kernel/printk/printk.c:3065) [ 439.380336][ T1799] hardirqs last disabled at (5494): console_unlock (kernel/printk/printk.c:339 (discriminator 3) kernel/printk/printk.c:2746 (discriminator 3) kernel/printk/printk.c:3065 (discriminator 3)) [ 439.381023][ T1799] softirqs last enabled at (5142): handle_softirqs (kernel/softirq.c:401 (discriminator 2) kernel/softirq.c:582 (discriminator 2)) [ 439.381726][ T1799] softirqs last disabled at (5133): __do_softirq (kernel/softirq.c:589) [ 439.382384][ T1799] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240725/202407251351.f65c33a0-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki