loop3: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-use-after-free in dtCompare fs/jfs/jfs_dtree.c:3333 [inline] BUG: KASAN: slab-use-after-free in dtSearch+0x1697/0x2570 fs/jfs/jfs_dtree.c:650 Read of size 1 at addr ffff888076ace2d0 by task syz.3.284/8412 CPU: 0 UID: 0 PID: 8412 Comm: syz.3.284 Not tainted 6.15.0-rc1-syzkaller-00095-g2eb959eeecc6 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 dtCompare fs/jfs/jfs_dtree.c:3333 [inline] dtSearch+0x1697/0x2570 fs/jfs/jfs_dtree.c:650 jfs_lookup+0x18b/0x440 fs/jfs/namei.c:1461 __lookup_slow+0x2b1/0x400 fs/namei.c:1807 lookup_slow+0x53/0x70 fs/namei.c:1824 walk_component+0x2f4/0x420 fs/namei.c:2128 lookup_last fs/namei.c:2626 [inline] path_lookupat+0x169/0x440 fs/namei.c:2650 do_o_path+0x97/0x230 fs/namei.c:3975 path_openat+0x2ef4/0x35d0 fs/namei.c:3997 do_filp_open+0x284/0x4e0 fs/namei.c:4031 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x249/0x2a0 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8fdb38d169 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8fdc11a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8fdb5a5fa0 RCX: 00007f8fdb38d169 RDX: 0000000000614100 RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f8fdb40e730 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8fdb5a5fa0 R15: 00007ffeed82f4e8 Allocated by task 8216: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4151 [inline] slab_alloc_node mm/slub.c:4200 [inline] kmem_cache_alloc_lru_noprof+0x1e5/0x390 mm/slub.c:4219 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x69/0x1b0 fs/inode.c:346 iget_locked+0xf1/0x570 fs/inode.c:1439 jfs_iget+0x23/0x3e0 fs/jfs/inode.c:29 jfs_lookup+0x239/0x440 fs/jfs/namei.c:1469 __lookup_slow+0x2b1/0x400 fs/namei.c:1807 lookup_slow+0x53/0x70 fs/namei.c:1824 walk_component+0x2f4/0x420 fs/namei.c:2128 lookup_last fs/namei.c:2626 [inline] path_lookupat+0x169/0x440 fs/namei.c:2650 filename_lookup+0x290/0x670 fs/namei.c:2679 do_linkat+0x141/0x700 fs/namei.c:4862 __do_sys_link fs/namei.c:4916 [inline] __se_sys_link fs/namei.c:4914 [inline] __x64_sys_link+0x82/0x90 fs/namei.c:4914 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2389 [inline] slab_free mm/slub.c:4646 [inline] kmem_cache_free+0x197/0x410 mm/slub.c:4748 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0xaac/0x17a0 kernel/rcu/tree.c:2824 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579 run_ksoftirqd+0xcf/0x130 kernel/softirq.c:968 smpboot_thread_fn+0x576/0xaa0 kernel/smpboot.c:164 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3082 [inline] call_rcu+0x172/0xad0 kernel/rcu/tree.c:3202 destroy_inode fs/inode.c:401 [inline] evict+0x837/0x9b0 fs/inode.c:834 dispose_list fs/inode.c:852 [inline] evict_inodes+0x6f8/0x7a0 fs/inode.c:906 generic_shutdown_super+0xa0/0x2d0 fs/super.c:627 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435 task_work_run+0x251/0x310 kernel/task_work.c:227 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:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888076acdc30 which belongs to the cache jfs_ip of size 2232 The buggy address is located 1696 bytes inside of freed 2232-byte region [ffff888076acdc30, ffff888076ace4e8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76ac8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888020bc0801 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888147eba280 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff888020bc0801 head: 00fff00000000040 ffff888147eba280 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff888020bc0801 head: 00fff00000000003 ffffea0001dab201 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6638, tgid 6637 (syz.1.80), ts 128345196924, free_ts 121384356265 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717 prep_new_page mm/page_alloc.c:1725 [inline] get_page_from_freelist+0x351d/0x36b0 mm/page_alloc.c:3652 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2459 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2623 new_slab mm/slub.c:2676 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3862 __slab_alloc+0x58/0xa0 mm/slub.c:3952 __slab_alloc_node mm/slub.c:4027 [inline] slab_alloc_node mm/slub.c:4188 [inline] kmem_cache_alloc_lru_noprof+0x274/0x390 mm/slub.c:4219 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x69/0x1b0 fs/inode.c:346 new_inode+0x22/0x180 fs/inode.c:1145 jfs_fill_super+0x570/0xd90 fs/jfs/super.c:511 get_tree_bdev_flags+0x490/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3879 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4407 page last free pid 6492 tgid 6492 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xddf/0x10a0 mm/page_alloc.c:2680 __slab_free+0x2c6/0x390 mm/slub.c:4557 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/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:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4151 [inline] slab_alloc_node mm/slub.c:4200 [inline] __do_kmalloc_node mm/slub.c:4330 [inline] __kvmalloc_node_noprof+0x2ca/0x5a0 mm/slub.c:5016 seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x20b/0xda0 fs/seq_file.c:210 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x9a0/0xb90 fs/read_write.c:570 ksys_read+0x19d/0x2d0 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888076ace180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076ace200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888076ace280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888076ace300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076ace380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================