================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x1fd0 kernel/locking/lockdep.c:5005 Read of size 8 at addr ffff88807d639048 by task kworker/u8:8/2462 CPU: 0 PID: 2462 Comm: kworker/u8:8 Not tainted 6.9.0-rc7-next-20240510-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: events_unbound netfs_write_collection_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __lock_acquire+0x78/0x1fd0 kernel/locking/lockdep.c:5005 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] p9_fd_request+0x53/0x520 net/9p/trans_fd.c:674 p9_client_rpc+0x303/0xac0 net/9p/client.c:704 p9_client_clunk+0x75/0x260 net/9p/client.c:1439 netfs_free_request+0x244/0x5e0 fs/netfs/objects.c:133 netfs_write_collection_worker+0x507c/0x5640 fs/netfs/write_collect.c:701 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 11433: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace_noprof+0x19c/0x2c0 mm/slub.c:4152 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] p9_fd_open net/9p/trans_fd.c:828 [inline] p9_fd_create+0x17b/0x530 net/9p/trans_fd.c:1102 p9_client_create+0x860/0x1040 net/9p/client.c:1013 v9fs_session_init+0x1e4/0x1b80 fs/9p/v9fs.c:410 v9fs_mount+0xce/0xa90 fs/9p/vfs_super.c:122 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 11086: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2195 [inline] slab_free mm/slub.c:4436 [inline] kfree+0x149/0x360 mm/slub.c:4557 p9_client_destroy+0xc7/0x660 net/9p/client.c:1065 v9fs_session_close+0x51/0x210 fs/9p/v9fs.c:506 v9fs_kill_super+0x5c/0x90 fs/9p/vfs_super.c:196 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267 task_work_run+0x24f/0x310 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2207 __queue_work+0xc24/0xef0 kernel/workqueue.c:2359 queue_work_on+0x1c2/0x380 kernel/workqueue.c:2410 queue_work include/linux/workqueue.h:621 [inline] schedule_work include/linux/workqueue.h:682 [inline] p9_poll_mux net/9p/trans_fd.c:639 [inline] p9_poll_workfn+0x3b0/0x5e0 net/9p/trans_fd.c:1177 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2207 __queue_work+0xc24/0xef0 kernel/workqueue.c:2359 queue_work_on+0x1c2/0x380 kernel/workqueue.c:2410 queue_work include/linux/workqueue.h:621 [inline] schedule_work include/linux/workqueue.h:682 [inline] p9_fd_request+0x2e1/0x520 net/9p/trans_fd.c:691 p9_client_rpc+0x303/0xac0 net/9p/client.c:704 p9_client_write+0x328/0x7a0 net/9p/client.c:1633 v9fs_issue_write+0xfd/0x1c0 fs/9p/vfs_addr.c:59 netfs_issue_write fs/netfs/write_issue.c:258 [inline] netfs_advance_write+0x776/0xe00 fs/netfs/write_issue.c:298 netfs_write_folio+0x1263/0x1f70 fs/netfs/write_issue.c:468 netfs_writepages+0x91f/0xf20 fs/netfs/write_issue.c:536 do_writepages+0x359/0x870 mm/page-writeback.c:2634 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397 __filemap_fdatawrite_range mm/filemap.c:430 [inline] __filemap_fdatawrite mm/filemap.c:436 [inline] filemap_fdatawrite+0xfb/0x160 mm/filemap.c:441 v9fs_dir_release+0x154/0x560 fs/9p/vfs_dir.c:219 __fput+0x406/0x8b0 fs/file_table.c:422 __do_sys_close fs/open.c:1555 [inline] __se_sys_close fs/open.c:1540 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1540 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807d639000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 72 bytes inside of freed 1024-byte region [ffff88807d639000, ffff88807d639400) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d638 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015041dc0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015041dc0 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea0001f58e01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4947, tgid 4947 (sshd), ts 55214806303, free_ts 53935425493 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2264 allocate_slab+0x5a/0x2e0 mm/slub.c:2427 new_slab mm/slub.c:2480 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3666 __slab_alloc+0x58/0xa0 mm/slub.c:3756 __slab_alloc_node mm/slub.c:3809 [inline] slab_alloc_node mm/slub.c:3988 [inline] __do_kmalloc_node mm/slub.c:4120 [inline] kmalloc_node_track_caller_noprof+0x286/0x450 mm/slub.c:4141 kmemdup_noprof+0x2a/0x60 mm/util.c:131 bpf_prog_store_orig_filter net/core/filter.c:1154 [inline] bpf_prog_create_from_user+0x270/0x3e0 net/core/filter.c:1438 seccomp_prepare_filter kernel/seccomp.c:680 [inline] seccomp_prepare_user_filter kernel/seccomp.c:717 [inline] seccomp_set_mode_filter kernel/seccomp.c:1935 [inline] do_seccomp+0x90d/0xf90 kernel/seccomp.c:2055 __do_sys_prctl kernel/sys.c:2539 [inline] __se_sys_prctl+0xb49/0x3990 kernel/sys.c:2457 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 4937 tgid 4937 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2601 discard_slab mm/slub.c:2526 [inline] __put_partials+0xeb/0x130 mm/slub.c:2994 put_cpu_partial+0x17c/0x250 mm/slub.c:3069 __slab_free+0x2ea/0x3d0 mm/slub.c:4306 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4000 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4007 ptlock_alloc mm/memory.c:6451 [inline] ptlock_init include/linux/mm.h:2968 [inline] pmd_ptlock_init include/linux/mm.h:3068 [inline] pagetable_pmd_ctor include/linux/mm.h:3106 [inline] pmd_alloc_one_noprof include/asm-generic/pgalloc.h:141 [inline] __pmd_alloc+0x110/0x630 mm/memory.c:5925 pmd_alloc include/linux/mm.h:2866 [inline] alloc_new_pmd mm/mremap.c:96 [inline] move_page_tables+0x1b71/0x1e00 mm/mremap.c:608 shift_arg_pages fs/exec.c:727 [inline] setup_arg_pages+0xc1d/0x1000 fs/exec.c:849 load_elf_binary+0xbb6/0x2620 fs/binfmt_elf.c:1013 search_binary_handler fs/exec.c:1797 [inline] exec_binprm fs/exec.c:1839 [inline] bprm_execve+0xaf8/0x17c0 fs/exec.c:1891 do_execveat_common+0x553/0x700 fs/exec.c:1998 do_execve fs/exec.c:2072 [inline] __do_sys_execve fs/exec.c:2148 [inline] __se_sys_execve fs/exec.c:2143 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2143 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 Memory state around the buggy address: ffff88807d638f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d638f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807d639000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d639080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d639100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================