================================================================== BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:835 [inline] BUG: KASAN: use-after-free in hlist_del include/linux/list.h:852 [inline] BUG: KASAN: use-after-free in __cpuhp_state_remove_instance+0x251/0x360 kernel/cpu.c:2002 Read of size 8 at addr ffff888012eaf798 by task syz-executor.5/12966 CPU: 1 PID: 12966 Comm: syz-executor.5 Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x176/0x24e lib/dump_stack.c:120 print_address_description+0x5f/0x3a0 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report+0x15e/0x210 mm/kasan/report.c:416 __hlist_del include/linux/list.h:835 [inline] hlist_del include/linux/list.h:852 [inline] __cpuhp_state_remove_instance+0x251/0x360 kernel/cpu.c:2002 cpuhp_state_remove_instance_nocalls include/linux/cpuhotplug.h:407 [inline] io_wq_create+0x86d/0xa10 fs/io-wq.c:1056 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0x234/0x520 fs/io_uring.c:7811 io_uring_add_task_file+0x265/0x320 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 fs/io_uring.c:9571 [inline] __do_sys_io_uring_setup fs/io_uring.c:9577 [inline] __se_sys_io_uring_setup+0x1ea5/0x2c30 fs/io_uring.c:9574 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f13979bc108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465f69 RDX: 0000000020ffd000 RSI: 00000000200002c0 RDI: 0000000000007b98 RBP: 00000000200002c0 R08: 0000000020000040 R09: 0000000020000040 R10: 0000000020000000 R11: 0000000000000202 R12: 0000000020000040 R13: 0000000020ffd000 R14: 0000000020000000 R15: 0000000020ffd000 Allocated by task 12966: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc+0xc2/0xf0 mm/kasan/common.c:506 kasan_kmalloc include/linux/kasan.h:233 [inline] kmem_cache_alloc_trace+0x21b/0x350 mm/slub.c:2934 kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:684 [inline] io_wq_create+0xb6/0xa10 fs/io-wq.c:1002 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0x234/0x520 fs/io_uring.c:7811 io_uring_add_task_file+0x265/0x320 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 fs/io_uring.c:9571 [inline] __do_sys_io_uring_setup fs/io_uring.c:9577 [inline] __se_sys_io_uring_setup+0x1ea5/0x2c30 fs/io_uring.c:9574 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 12966: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:357 ____kasan_slab_free+0x100/0x140 mm/kasan/common.c:360 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x171/0x270 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xcf/0x2d0 mm/slub.c:4213 io_wq_create+0x7dc/0xa10 fs/io-wq.c:1053 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0x234/0x520 fs/io_uring.c:7811 io_uring_add_task_file+0x265/0x320 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 fs/io_uring.c:9571 [inline] __do_sys_io_uring_setup fs/io_uring.c:9577 [inline] __se_sys_io_uring_setup+0x1ea5/0x2c30 fs/io_uring.c:9574 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:345 insert_work+0x54/0x400 kernel/workqueue.c:1331 __queue_work+0x97f/0xcc0 kernel/workqueue.c:1497 queue_work_on+0xc0/0x180 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x206/0x3d0 kernel/umh.c:433 kobject_uevent_env+0x1349/0x1730 lib/kobject_uevent.c:617 kobject_synth_uevent+0x368/0x8a0 lib/kobject_uevent.c:208 store_uevent+0x12/0x20 kernel/module.c:1163 module_attr_store+0x58/0x80 kernel/params.c:901 kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x896/0xab0 fs/read_write.c:605 ksys_write+0x11b/0x220 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:345 insert_work+0x54/0x400 kernel/workqueue.c:1331 __queue_work+0x97f/0xcc0 kernel/workqueue.c:1497 queue_work_on+0xc0/0x180 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x206/0x3d0 kernel/umh.c:433 kobject_uevent_env+0x1349/0x1730 lib/kobject_uevent.c:617 kobject_synth_uevent+0x368/0x8a0 lib/kobject_uevent.c:208 bus_uevent_store+0x4b/0x70 drivers/base/bus.c:765 kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x896/0xab0 fs/read_write.c:605 ksys_write+0x11b/0x220 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888012eaf700 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 152 bytes inside of 192-byte region [ffff888012eaf700, ffff888012eaf7c0) The buggy address belongs to the page: page:000000002cdf37a1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12eaf flags: 0xfff00000000200(slab) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888010841a00 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888012eaf680: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888012eaf700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888012eaf780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888012eaf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888012eaf880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================