================================================================== BUG: KASAN: invalid-access in __cpuhp_state_remove_instance+0xf0/0x15c kernel/cpu.c:2001 Read at addr f7ff00000b48fc60 by task syz-executor.0/25423 Pointer tag: [f7], memory tag: [fe] CPU: 0 PID: 25423 Comm: syz-executor.0 Not tainted 5.12.0-rc1-syzkaller-00082-g280d542f6ffa #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x0/0x1b0 arch/arm64/kernel/stacktrace.c:112 show_stack+0x18/0x70 arch/arm64/kernel/stacktrace.c:191 __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xd0/0x12c lib/dump_stack.c:120 print_address_description+0x70/0x29c mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report+0x134/0x380 mm/kasan/report.c:416 report_tag_fault arch/arm64/mm/fault.c:324 [inline] do_tag_recovery arch/arm64/mm/fault.c:336 [inline] __do_kernel_fault+0x1a8/0x1dc arch/arm64/mm/fault.c:378 do_bad_area arch/arm64/mm/fault.c:474 [inline] do_tag_check_fault+0x74/0x90 arch/arm64/mm/fault.c:729 do_mem_abort+0x44/0xbc arch/arm64/mm/fault.c:805 el1_abort+0x40/0x6c arch/arm64/kernel/entry-common.c:167 el1_sync_handler+0xac/0xd0 arch/arm64/kernel/entry-common.c:259 el1_sync+0x70/0x100 arch/arm64/kernel/entry.S:656 __cpuhp_state_remove_instance+0xf0/0x15c kernel/cpu.c:2001 cpuhp_state_remove_instance_nocalls include/linux/cpuhotplug.h:407 [inline] io_wq_create+0x278/0x3d4 fs/io-wq.c:1056 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0xd8/0x1ec fs/io_uring.c:7811 io_uring_add_task_file+0xa8/0x120 fs/io_uring.c:8773 io_uring_install_fd fs/io_uring.c:9381 [inline] io_uring_create fs/io_uring.c:9532 [inline] io_uring_setup+0x93c/0xbe0 fs/io_uring.c:9571 __do_sys_io_uring_setup fs/io_uring.c:9577 [inline] __se_sys_io_uring_setup fs/io_uring.c:9574 [inline] __arm64_sys_io_uring_setup+0x20/0x30 fs/io_uring.c:9574 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x60/0x120 arch/arm64/kernel/syscall.c:129 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:168 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:416 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:432 el0_sync+0x18c/0x1c0 arch/arm64/kernel/entry.S:699 Allocated by task 25423: stack_trace_save+0x50/0x80 kernel/stacktrace.c:121 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0xc8/0x100 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:233 [inline] kmem_cache_alloc_trace include/linux/slab.h:452 [inline] kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:684 [inline] io_wq_create+0x64/0x3d4 fs/io-wq.c:1002 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0xd8/0x1ec fs/io_uring.c:7811 io_uring_add_task_file+0xa8/0x120 fs/io_uring.c:8773 io_uring_install_fd fs/io_uring.c:9381 [inline] io_uring_create fs/io_uring.c:9532 [inline] io_uring_setup+0x93c/0xbe0 fs/io_uring.c:9571 __do_sys_io_uring_setup fs/io_uring.c:9577 [inline] __se_sys_io_uring_setup fs/io_uring.c:9574 [inline] __arm64_sys_io_uring_setup+0x20/0x30 fs/io_uring.c:9574 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x60/0x120 arch/arm64/kernel/syscall.c:129 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:168 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:416 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:432 el0_sync+0x18c/0x1c0 arch/arm64/kernel/entry.S:699 Freed by task 25423: stack_trace_save+0x50/0x80 kernel/stacktrace.c:121 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38 kasan_set_track+0x28/0x40 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/hw_tags.c:174 ____kasan_slab_free.constprop.0+0x1e0/0x230 mm/kasan/common.c:360 __kasan_slab_free+0x10/0x1c mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0xbc/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0x348/0x4d0 mm/slub.c:4213 io_wq_destroy fs/io-wq.c:1091 [inline] io_wq_put+0x1fc/0x250 fs/io-wq.c:1098 io_wq_create+0x378/0x3d4 fs/io-wq.c:1053 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0xd8/0x1ec fs/io_uring.c:7811 io_uring_add_task_file+0xa8/0x120 fs/io_uring.c:8773 io_uring_install_fd fs/io_uring.c:9381 [inline] io_uring_create fs/io_uring.c:9532 [inline] io_uring_setup+0x93c/0xbe0 fs/io_uring.c:9571 __do_sys_io_uring_setup fs/io_uring.c:9577 [inline] __se_sys_io_uring_setup fs/io_uring.c:9574 [inline] __arm64_sys_io_uring_setup+0x20/0x30 fs/io_uring.c:9574 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x60/0x120 arch/arm64/kernel/syscall.c:129 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:168 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:416 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:432 el0_sync+0x18c/0x1c0 arch/arm64/kernel/entry.S:699 The buggy address belongs to the object at ffff00000b48fc00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 96 bytes inside of 128-byte region [ffff00000b48fc00, ffff00000b48fc80) The buggy address belongs to the page: page:00000000a89ba0df refcount:1 mapcount:0 mapping:0000000000000000 index:0xf0ff00000b48f600 pfn:0x4b48f memcg:f7ff00002998c601 flags: 0x1ffffc000000200(slab) raw: 01ffffc000000200 fffffc0000a00600 0000000200000002 f2ff000004401200 raw: f0ff00000b48f600 000000008010000e 00000001ffffffff f7ff00002998c601 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00000b48fa00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff00000b48fb00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >ffff00000b48fc00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffff00000b48fd00: f2 f2 f2 f2 f2 fe fe fe fe fe fe fe fe fe fe fe ffff00000b48fe00: f2 f2 f2 f2 fe fe fe fe fe fe fe fe fe fe fe fe ==================================================================