------------[ cut here ]------------ kmem_cache of name 'ppl_io_unit' already exists WARNING: mm/slab_common.c:112 at kmem_cache_sanity_check mm/slab_common.c:111 [inline], CPU#1: syz.6.521/7549 WARNING: mm/slab_common.c:112 at __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352, CPU#1: syz.6.521/7549 Modules linked in: CPU: 1 UID: 0 PID: 7549 Comm: syz.6.521 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : kmem_cache_sanity_check mm/slab_common.c:111 [inline] pc : __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352 lr : kmem_cache_sanity_check mm/slab_common.c:111 [inline] lr : __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352 sp : ffff800092bb7760 x29: ffff800092bb7760 x28: dfff800000000000 x27: ffff700012576f00 x26: ffff0000d17da224 x25: 1fffe0003ff64c00 x24: ffff0000d16e1ba0 x23: ffff800088ed1d78 x22: ffff800092bb7820 x21: 00000000000002d8 x20: 0000000000000000 x19: ffff80008768dbe0 x18: 00000000ffffffff x17: 0000000000000003 x16: ffff800088bf7000 x15: ffff800080cc4178 x14: ffff80008a8a7000 x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000080000 x9 : b3dd589702324500 x8 : b3dd589702324500 x7 : ffff80008048e314 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f9194 x2 : 0000000100000000 x1 : ffff0000f1820000 x0 : 0000000000000001 Call trace: kmem_cache_sanity_check mm/slab_common.c:111 [inline] (P) __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352 (P) ppl_init_log+0x200/0xbe8 drivers/md/raid5-ppl.c:1363 log_init drivers/md/raid5-log.h:138 [inline] raid5_change_consistency_policy+0x1d8/0x5e4 drivers/md/raid5.c:9141 consistency_policy_store+0x7c/0x228 drivers/md/md.c:5883 md_attr_store+0x304/0x438 drivers/md/md.c:6158 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 irq event stamp: 4178 hardirqs last enabled at (4177): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (4177): [] __arm64_exit_to_kernel_mode+0x64/0x78 arch/arm64/kernel/entry-common.c:60 hardirqs last disabled at (4178): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445 softirqs last enabled at (3470): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (3470): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (3470): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797 softirqs last disabled at (3468): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (3468): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (3468): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ kmem_cache of name 'ppl_io_unit' already exists WARNING: mm/slab_common.c:112 at kmem_cache_sanity_check mm/slab_common.c:111 [inline], CPU#0: syz.6.521/7549 WARNING: mm/slab_common.c:112 at __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352, CPU#0: syz.6.521/7549 Modules linked in: CPU: 0 UID: 0 PID: 7549 Comm: syz.6.521 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : kmem_cache_sanity_check mm/slab_common.c:111 [inline] pc : __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352 lr : kmem_cache_sanity_check mm/slab_common.c:111 [inline] lr : __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352 sp : ffff800092bb7760 x29: ffff800092bb7760 x28: dfff800000000000 x27: ffff700012576f00 x26: ffff0000d17da224 x25: 1fffe0003ff67800 x24: ffff0000d16e1ba0 x23: ffff800088ed1d78 x22: ffff800092bb7820 x21: 00000000000002d8 x20: 0000000000000000 x19: ffff80008768dbe0 x18: 1fffe00035b9ec28 x17: 0000000000000003 x16: ffff800088bf7000 x15: ffff800088ca7ee0 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000003 x11: ffff80008a6a6e28 x10: 0000000000000003 x9 : b3dd589702324500 x8 : b3dd589702324500 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000801561b4 x2 : 0000000000000006 x1 : ffff0000f1820000 x0 : 0000000000000001 Call trace: kmem_cache_sanity_check mm/slab_common.c:111 [inline] (P) __kmem_cache_create_args+0xc4/0x480 mm/slab_common.c:352 (P) ppl_init_log+0x200/0xbe8 drivers/md/raid5-ppl.c:1363 log_init drivers/md/raid5-log.h:138 [inline] raid5_change_consistency_policy+0x1d8/0x5e4 drivers/md/raid5.c:9141 consistency_policy_store+0x7c/0x228 drivers/md/md.c:5883 md_attr_store+0x304/0x438 drivers/md/md.c:6158 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 irq event stamp: 6078 hardirqs last enabled at (6077): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1698 [inline] hardirqs last enabled at (6077): [] finish_lock_switch kernel/sched/core.c:5251 [inline] hardirqs last enabled at (6077): [] finish_task_switch+0x234/0x858 kernel/sched/core.c:5369 hardirqs last disabled at (6078): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445 softirqs last enabled at (6016): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (6016): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (6016): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797 softirqs last disabled at (6014): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (6014): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (6014): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790 ---[ end trace 0000000000000000 ]---