================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe0/0xf0 lib/list_debug.c:51 Read of size 8 at addr ffff888029aee2e8 by task ksoftirqd/1/19 CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __list_del_entry_valid+0xe0/0xf0 lib/list_debug.c:51 __list_del_entry include/linux/list.h:132 [inline] list_del include/linux/list.h:146 [inline] put_css_set_locked+0x17b/0x1000 kernel/cgroup/cgroup.c:969 put_css_set kernel/cgroup/cgroup-internal.h:193 [inline] put_css_set kernel/cgroup/cgroup-internal.h:180 [inline] cgroup_free+0x8f/0x1b0 kernel/cgroup/cgroup.c:6369 __put_task_struct+0x113/0x400 kernel/fork.c:750 put_task_struct include/linux/sched/task.h:113 [inline] delayed_put_task_struct+0x1f6/0x340 kernel/exit.c:173 rcu_do_batch kernel/rcu/tree.c:2508 [inline] rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2743 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:920 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] cgroup_create kernel/cgroup/cgroup.c:5293 [inline] cgroup_mkdir+0x256/0x10f0 kernel/cgroup/cgroup.c:5440 kernfs_iop_mkdir+0x146/0x1d0 fs/kernfs/dir.c:1142 vfs_mkdir+0x1ce/0x3f0 fs/namei.c:3885 do_mkdirat+0x285/0x300 fs/namei.c:3911 __do_sys_mkdir fs/namei.c:3931 [inline] __se_sys_mkdir fs/namei.c:3929 [inline] __x64_sys_mkdir+0xf2/0x140 fs/namei.c:3929 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 3806: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1628 [inline] slab_free_freelist_hook+0xe3/0x250 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kfree+0xe4/0x540 mm/slub.c:4267 css_free_rwork_fn+0x51f/0x10f0 kernel/cgroup/cgroup.c:5080 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1353 __queue_work+0x5ca/0xee0 kernel/workqueue.c:1519 rcu_work_rcufn+0x58/0x80 kernel/workqueue.c:1755 rcu_do_batch kernel/rcu/tree.c:2508 [inline] rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2743 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2987 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067 queue_rcu_work+0x82/0xa0 kernel/workqueue.c:1775 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888029aee000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 744 bytes inside of 4096-byte region [ffff888029aee000, ffff888029aef000) The buggy address belongs to the page: page:ffffea0000a6ba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29ae8 head:ffffea0000a6ba00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888010c42140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 1638287350061, free_ts 1637989004500 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4168 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5390 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2291 alloc_slab_page mm/slub.c:1691 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1831 new_slab mm/slub.c:1894 [inline] new_slab_objects mm/slub.c:2640 [inline] ___slab_alloc+0x473/0x7b0 mm/slub.c:2803 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843 slab_alloc_node mm/slub.c:2925 [inline] slab_alloc mm/slub.c:2967 [inline] __kmalloc+0x312/0x330 mm/slub.c:4111 kmalloc include/linux/slab.h:596 [inline] tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x21b/0x400 security/tomoyo/file.c:822 security_inode_getattr+0xcf/0x140 security/security.c:1333 vfs_getattr fs/stat.c:157 [inline] vfs_statx+0x164/0x390 fs/stat.c:225 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat+0x96/0x120 fs/stat.c:412 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3411 unfreeze_partials+0x16c/0x1b0 mm/slub.c:2421 put_cpu_partial+0x13d/0x230 mm/slub.c:2457 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2959 [inline] slab_alloc mm/slub.c:2967 [inline] __kmalloc+0x1f4/0x330 mm/slub.c:4111 kmalloc include/linux/slab.h:596 [inline] sock_kmalloc net/core/sock.c:2376 [inline] sock_kmalloc+0xb5/0x100 net/core/sock.c:2367 ____sys_sendmsg+0x640/0x810 net/socket.c:2382 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff888029aee180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029aee200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888029aee280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029aee300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029aee380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================