loop6: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-use-after-free in jfs_readdir+0x1973/0x3ae0 fs/jfs/jfs_dtree.c:2916 Read of size 1 at addr ffff8880606f04a5 by task syz.6.902/15919 CPU: 1 UID: 0 PID: 15919 Comm: syz.6.902 Tainted: G W 6.17.0-rc2-syzkaller #0 PREEMPT_{RT,(full)} Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 jfs_readdir+0x1973/0x3ae0 fs/jfs/jfs_dtree.c:2916 wrap_directory_iterator+0x96/0xe0 fs/readdir.c:65 iterate_dir+0x3a2/0x580 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f79c4f2ebe9 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:00007f79c3196038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f79c5155fa0 RCX: 00007f79c4f2ebe9 RDX: 00000000000000be RSI: 00002000000001c0 RDI: 0000000000000009 RBP: 00007f79c4fb1e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f79c5156038 R14: 00007f79c5155fa0 R15: 00007ffe099dd078 Allocated by task 15320: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_lru_noprof+0x14c/0x310 mm/slub.c:4248 ocfs2_alloc_inode+0x2a/0xf0 fs/ocfs2/super.c:553 alloc_inode+0x6a/0x1b0 fs/inode.c:346 iget5_locked+0x4a/0xa0 fs/inode.c:1355 ocfs2_iget+0x22c/0x1a90 fs/ocfs2/inode.c:145 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:142 [inline] ocfs2_get_system_file_inode+0x37a/0x7d0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x319/0x660 fs/ocfs2/super.c:461 ocfs2_initialize_super fs/ocfs2/super.c:2196 [inline] ocfs2_fill_super+0x447b/0x65f0 fs/ocfs2/super.c:993 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4321 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 28: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x195/0x510 mm/slub.c:4782 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core kernel/rcu/tree.c:2861 [inline] rcu_cpu_kthread+0xbf3/0x1b50 kernel/rcu/tree.c:2949 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3123 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243 destroy_inode fs/inode.c:401 [inline] evict+0x847/0x9c0 fs/inode.c:834 ocfs2_release_system_inodes+0x133/0x490 fs/ocfs2/super.c:517 ocfs2_dismount_volume+0x3dc/0x8d0 fs/ocfs2/super.c:1852 generic_shutdown_super+0x132/0x2c0 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1766 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880606f0000 which belongs to the cache ocfs2_inode_cache of size 4048 The buggy address is located 1189 bytes inside of freed 4048-byte region [ffff8880606f0000, ffff8880606f0fd0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880606f0000 pfn:0x606f0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888054a7ca01 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff888140f39140 ffff88801f743788 ffff88801f743788 raw: ffff8880606f0000 0000000000070000 00000000f5000000 ffff888054a7ca01 head: 0080000000000240 ffff888140f39140 ffff88801f743788 ffff88801f743788 head: ffff8880606f0000 0000000000070000 00000000f5000000 ffff888054a7ca01 head: 0080000000000003 ffffea000181bc01 00000000ffffffff 00000000ffffffff head: 0000000000000000 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 6372, tgid 6371 (syz.0.61), ts 111588956631, free_ts 110360033823 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x2119/0x21b0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0x8d1/0xdd0 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] kmem_cache_alloc_lru_noprof+0xea/0x310 mm/slub.c:4248 ocfs2_alloc_inode+0x2a/0xf0 fs/ocfs2/super.c:553 alloc_inode+0x6a/0x1b0 fs/inode.c:346 iget5_locked+0x4a/0xa0 fs/inode.c:1355 ocfs2_iget+0x22c/0x1a90 fs/ocfs2/inode.c:145 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:142 [inline] ocfs2_get_system_file_inode+0x37a/0x7d0 fs/ocfs2/sysfile.c:112 ocfs2_init_local_system_inodes fs/ocfs2/super.c:491 [inline] ocfs2_mount_volume fs/ocfs2/super.c:1756 [inline] ocfs2_fill_super+0x39ae/0x65f0 fs/ocfs2/super.c:1083 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805 page last free pid 5838 tgid 5838 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xb59/0xce0 mm/page_alloc.c:2895 free_large_kmalloc+0x13a/0x1f0 mm/slub.c:4805 btree_bounce_free fs/bcachefs/btree_io.c:115 [inline] btree_node_sort+0x117f/0x1760 fs/bcachefs/btree_io.c:383 bch2_btree_post_write_cleanup+0x11f/0xad0 fs/bcachefs/btree_io.c:2607 bch2_btree_node_write_trans+0x17b/0x760 fs/bcachefs/btree_io.c:2676 btree_node_write_if_need fs/bcachefs/btree_io.h:167 [inline] __btree_node_flush+0x323/0x430 fs/bcachefs/btree_trans_commit.c:255 bch2_btree_node_flush1+0x2a/0x40 fs/bcachefs/btree_trans_commit.c:269 journal_flush_pins+0x8e3/0xe90 fs/bcachefs/journal_reclaim.c:604 journal_flush_pins_or_still_flushing fs/bcachefs/journal_reclaim.c:871 [inline] journal_flush_done+0x112/0x810 fs/bcachefs/journal_reclaim.c:889 bch2_journal_flush_pins+0x155/0x250 fs/bcachefs/journal_reclaim.c:921 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline] __bch2_fs_read_only+0x144/0x5b0 fs/bcachefs/super.c:291 bch2_fs_read_only+0x42a/0xb00 fs/bcachefs/super.c:366 __bch2_fs_stop+0x100/0x900 fs/bcachefs/super.c:677 generic_shutdown_super+0x132/0x2c0 fs/super.c:643 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2618 deactivate_locked_super+0xbc/0x130 fs/super.c:474 Memory state around the buggy address: ffff8880606f0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880606f0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880606f0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880606f0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880606f0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================