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Hello, kernel test robot noticed "WARNING:at_mm/slub.c:#free_large_kmalloc" on: commit: 2ad3ef4260e9bd8628025b35fa2613c7e4e7720f ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") https://github.com/paulmckrcu/linux dev.2025.08.14a in testcase: rcutorture version: with following parameters: runtime: 300s test: default torture_type: tasks-tracing config: i386-randconfig-013-20250820 compiler: clang-20 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) 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/202508221045.ecc6098e-lkp@intel.com [ 5.780201][ T1] ------------[ cut here ]------------ [ 5.780793][ T1] WARNING: CPU: 0 PID: 1 at mm/slub.c:4790 free_large_kmalloc (mm/slub.c:4790 (discriminator 12)) [ 5.781568][ T1] Modules linked in: [ 5.782001][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G T 6.17.0-rc1-00030-g2ad3ef4260e9 #1 PREEMPT(lazy) f3de4fe5b382f5192602efb6727d7dab8a9b7f2f [ 5.784147][ T1] Tainted: [T]=RANDSTRUCT [ 5.784803][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 5.786255][ T1] EIP: free_large_kmalloc (mm/slub.c:4790 (discriminator 12)) [ 5.787027][ T1] Code: 89 d9 d3 e2 c1 fa 0c 01 15 ac cf d2 d0 01 15 d4 d5 5c d1 83 3e ff 74 06 c7 06 ff ff ff ff 89 da e8 8d 55 ff ff 5e 5f 5b 5d c3 <0f> 0b ba 2c b2 4e d0 e8 6c a4 c7 ff eb ed 89 c7 b8 30 26 b3 d0 ba All code ======== 0: 89 d9 mov %ebx,%ecx 2: d3 e2 shl %cl,%edx 4: c1 fa 0c sar $0xc,%edx 7: 01 15 ac cf d2 d0 add %edx,-0x2f2d3054(%rip) # 0xffffffffd0d2cfb9 d: 01 15 d4 d5 5c d1 add %edx,-0x2ea32a2c(%rip) # 0xffffffffd15cd5e7 13: 83 3e ff cmpl $0xffffffff,(%rsi) 16: 74 06 je 0x1e 18: c7 06 ff ff ff ff movl $0xffffffff,(%rsi) 1e: 89 da mov %ebx,%edx 20: e8 8d 55 ff ff call 0xffffffffffff55b2 25: 5e pop %rsi 26: 5f pop %rdi 27: 5b pop %rbx 28: 5d pop %rbp 29: c3 ret 2a:* 0f 0b ud2 <-- trapping instruction 2c: ba 2c b2 4e d0 mov $0xd04eb22c,%edx 31: e8 6c a4 c7 ff call 0xffffffffffc7a4a2 36: eb ed jmp 0x25 38: 89 c7 mov %eax,%edi 3a: b8 30 26 b3 d0 mov $0xd0b32630,%eax 3f: ba .byte 0xba Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: ba 2c b2 4e d0 mov $0xd04eb22c,%edx 7: e8 6c a4 c7 ff call 0xffffffffffc7a478 c: eb ed jmp 0xfffffffffffffffb e: 89 c7 mov %eax,%edi 10: b8 30 26 b3 d0 mov $0xd0b32630,%eax 15: ba .byte 0xba [ 5.789718][ T1] EAX: e7722700 EBX: e7238660 ECX: ff000000 EDX: e7238660 [ 5.790702][ T1] ESI: e7722700 EDI: cecc63c8 EBP: c1259a80 ESP: c1259a74 [ 5.791669][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010206 [ 5.792787][ T1] CR0: 80050033 CR2: b7fa3cd4 CR3: 10ed1000 CR4: 000406d0 [ 5.793708][ T1] Call Trace: [ 5.794192][ T1] ? crypto842_free_ctx (crypto/842.c:40) [ 5.794849][ T1] kfree (mm/slub.c:4874) [ 5.795393][ T1] crypto842_free_ctx (crypto/842.c:40) [ 5.796104][ T1] crypto_acomp_alloc_streams (include/linux/err.h:70 crypto/acompress.c:431) [ 5.796915][ T1] crypto_scomp_init_tfm (crypto/scompress.c:128) [ 5.797665][ T1] crypto_create_tfm_node (crypto/api.c:541) [ 5.798430][ T1] crypto_init_scomp_ops_async (include/linux/err.h:70 crypto/scompress.c:314) [ 5.799284][ T1] crypto_acomp_init_tfm (crypto/acompress.c:124) [ 5.800029][ T1] crypto_create_tfm_node (crypto/api.c:541) [ 5.800809][ T1] crypto_alloc_tfm_node (crypto/api.c:642) [ 5.801584][ T1] crypto_alloc_acomp_node (crypto/acompress.c:162) [ 5.802380][ T1] zswap_cpu_comp_prepare (mm/zswap.c:836) [ 5.803160][ T1] ? zswap_setup (mm/zswap.c:822) [ 5.803856][ T1] cpuhp_issue_call (kernel/cpu.c:205) [ 5.804563][ T1] ? mutex_lock_nested (kernel/locking/mutex.c:760 kernel/locking/mutex.c:812) [ 5.805313][ T1] ? zswap_setup (mm/zswap.c:822) [ 5.806053][ T1] __cpuhp_state_add_instance (kernel/cpu.c:2427 kernel/cpu.c:2448) [ 5.806918][ T1] zswap_pool_create (mm/zswap.c:295) [ 5.807704][ T1] __zswap_pool_create_fallback (mm/zswap.c:362) [ 5.808596][ T1] zswap_setup (mm/zswap.c:1868) [ 5.809302][ T1] zswap_init (mm/zswap.c:?) [ 5.809938][ T1] do_one_initcall (init/main.c:1269) [ 5.810654][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674) [ 5.811372][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674) [ 5.812111][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674) [ 5.812834][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674) [ 5.813557][ T1] ? __update_load_avg_cfs_rq (include/trace/events/sched.h:833 (discriminator 3)) [ 5.814379][ T1] ? lock_acquire (kernel/locking/lockdep.c:5868) [ 5.815070][ T1] ? lock_acquire (kernel/locking/lockdep.c:5868) [ 5.815799][ T1] ? ktime_get (include/linux/seqlock.h:226 (discriminator 3)) [ 5.816484][ T1] ? ktime_get (include/linux/seqlock.h:226 (discriminator 3)) [ 5.817045][ T1] ? ktime_get (include/linux/seqlock.h:226 (discriminator 3)) [ 5.817486][ T1] ? kvm_clock_get_cycles (arch/x86/include/asm/preempt.h:95 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) [ 5.817998][ T1] ? ktime_get (kernel/time/timekeeping.c:289 kernel/time/timekeeping.c:398 kernel/time/timekeeping.c:820) [ 5.818440][ T1] ? clockevents_program_event (kernel/time/clockevents.c:336) [ 5.818995][ T1] ? profile_tick (include/linux/profile.h:50) [ 5.819423][ T1] ? trace_hardirqs_on (kernel/trace/trace_preemptirq.c:80) [ 5.819882][ T1] ? irqentry_exit (kernel/entry/common.c:?) [ 5.820317][ T1] ? sysvec_hyperv_stimer0 (arch/x86/kernel/apic/apic.c:1050) [ 5.820829][ T1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 6)) [ 5.821357][ T1] ? handle_exception (arch/x86/entry/entry_32.S:1048) [ 5.821826][ T1] ? strlen (arch/x86/lib/string_32.c:167) [ 5.822209][ T1] ? next_arg (lib/cmdline.c:273) [ 5.822623][ T1] ? parameq (kernel/params.c:90 (discriminator 1) kernel/params.c:99 (discriminator 1)) [ 5.823014][ T1] ? swapfile_init (mm/zswap.c:1900) [ 5.823449][ T1] do_initcall_level (init/main.c:1330 (discriminator 6)) [ 5.823906][ T1] do_initcalls (init/main.c:1344 (discriminator 2)) [ 5.824319][ T1] ? rest_init (init/main.c:1461) [ 5.824747][ T1] ? rest_init (init/main.c:1461) [ 5.825163][ T1] do_basic_setup (init/main.c:1367) [ 5.825590][ T1] kernel_init_freeable (init/main.c:1581) [ 5.826058][ T1] kernel_init (init/main.c:1471) [ 5.826472][ T1] ret_from_fork (arch/x86/kernel/process.c:154) [ 5.826906][ T1] ? rest_init (init/main.c:1461) [ 5.827326][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 5.827778][ T1] entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 5.828225][ T1] irq event stamp: 1016907 [ 5.828641][ T1] hardirqs last enabled at (1016917): __console_unlock (arch/x86/include/asm/irqflags.h:19 arch/x86/include/asm/irqflags.h:109 arch/x86/include/asm/irqflags.h:151 kernel/printk/printk.c:344 kernel/printk/printk.c:2885) [ 5.829782][ T1] hardirqs last disabled at (1016928): __console_unlock (kernel/printk/printk.c:342 (discriminator 9)) [ 5.831001][ T1] softirqs last enabled at (1008778): __do_softirq (kernel/softirq.c:614) [ 5.832169][ T1] softirqs last disabled at (1008769): __do_softirq (kernel/softirq.c:614) [ 5.833335][ T1] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250822/202508221045.ecc6098e-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki