Hello, syzbot found the following issue on: HEAD commit: 54be6c6c5ae8 Linux 6.8-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1621a560180000 kernel config: https://syzkaller.appspot.com/x/.config?x=887796c7e5ffc20a dashboard link: https://syzkaller.appspot.com/bug?extid=be88fd56f9769df61aee compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-54be6c6c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a27c83e3f15d/vmlinux-54be6c6c.xz kernel image: https://storage.googleapis.com/syzbot-assets/0a4029d29e62/bzImage-54be6c6c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+be88fd56f9769df61aee@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: double-free in hfs_release_folio+0x435/0x570 fs/hfs/inode.c:118 Free of addr ffff88804e23b760 by task kswapd0/109 CPU: 1 PID: 109 Comm: kswapd0 Not tainted 6.8.0-rc3-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report_invalid_free+0xab/0xd0 mm/kasan/report.c:563 poison_slab_object mm/kasan/common.c:233 [inline] __kasan_slab_free+0x197/0x1c0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x370 mm/slub.c:4409 hfs_release_folio+0x435/0x570 fs/hfs/inode.c:118 filemap_release_folio+0x1f1/0x280 mm/filemap.c:4088 shrink_folio_list+0x2933/0x3ea0 mm/vmscan.c:1369 evict_folios+0x6e7/0x1b90 mm/vmscan.c:4521 try_to_shrink_lruvec+0x638/0xa10 mm/vmscan.c:4726 shrink_one+0x3f8/0x7b0 mm/vmscan.c:4765 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x21d0/0x3790 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6693 [inline] balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6883 kswapd+0x5be/0xc00 mm/vmscan.c:7143 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> Allocated by task 15903: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc+0x1f9/0x440 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] __hfs_bnode_create+0x108/0x860 fs/hfs/bnode.c:259 hfs_bnode_find+0x2d1/0xc50 fs/hfs/bnode.c:335 hfs_brec_find+0x2af/0x510 fs/hfs/bfind.c:126 hfs_brec_read+0x26/0x120 fs/hfs/bfind.c:165 hfs_cat_find_brec+0x18c/0x3a0 fs/hfs/catalog.c:194 hfs_fill_super+0x11e0/0x1870 fs/hfs/super.c:419 mount_bdev+0x1e3/0x2d0 fs/super.c:1663 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1784 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e2/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 Freed by task 5220: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x121/0x1c0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x370 mm/slub.c:4409 hfs_btree_close+0xac/0x390 fs/hfs/btree.c:154 hfs_mdb_put+0xbf/0x380 fs/hfs/mdb.c:360 generic_shutdown_super+0x159/0x3d0 fs/super.c:646 kill_block_super+0x3b/0x90 fs/super.c:1680 deactivate_locked_super+0xbe/0x1a0 fs/super.c:477 deactivate_super+0xde/0x100 fs/super.c:510 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14f/0x250 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:108 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x281/0x2b0 kernel/entry/common.c:212 __do_fast_syscall_32+0x8c/0x120 arch/x86/entry/common.c:324 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 The buggy address belongs to the object at ffff88804e23b760 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of 192-byte region [ffff88804e23b760, ffff88804e23b820) The buggy address belongs to the physical page: page:ffffea0001388e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4e23a head:ffffea0001388e80 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000840(slab|head|node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 04fff00000000840 ffff888014c42a00 ffffea0001499000 dead000000000002 raw: 0000000000000000 00000000001e001e 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5220, tgid 5220 (syz-executor.2), ts 205141987347, free_ts 204536887129 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4b0/0x1780 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node+0x361/0x470 mm/slub.c:3988 kmalloc_array_node include/linux/slab.h:688 [inline] kcalloc_node include/linux/slab.h:693 [inline] memcg_alloc_slab_cgroups+0xa9/0x180 mm/memcontrol.c:3009 __memcg_slab_post_alloc_hook+0xa3/0x370 mm/slub.c:1970 memcg_slab_post_alloc_hook mm/slub.c:1993 [inline] slab_post_alloc_hook mm/slub.c:3822 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x314/0x320 mm/slub.c:3867 kmem_cache_zalloc include/linux/slab.h:701 [inline] copy_signal kernel/fork.c:1855 [inline] copy_process+0x395d/0x6e30 kernel/fork.c:2494 kernel_clone+0xfd/0x930 kernel/fork.c:2902 __do_compat_sys_ia32_clone+0xb7/0x100 arch/x86/kernel/sys_ia32.c:254 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 page last free pid 6083 tgid 6083 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 __put_partials+0x14c/0x170 mm/slub.c:2922 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x58/0x150 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:324 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3867 vm_area_dup+0x21/0x300 kernel/fork.c:480 dup_mmap kernel/fork.c:695 [inline] dup_mm kernel/fork.c:1685 [inline] copy_mm+0xf93/0x2860 kernel/fork.c:1734 copy_process+0x4031/0x6e30 kernel/fork.c:2497 kernel_clone+0xfd/0x930 kernel/fork.c:2902 __do_sys_clone+0xba/0x100 kernel/fork.c:3045 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff88804e23b600: fc fc fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ffff88804e23b680: 00 00 00 00 00 00 00 00 00 00 04 fc fc fc fc fc >ffff88804e23b700: fc fc fc fc fc fc fc fc fc fc fc fc fa fb fb fb ^ ffff88804e23b780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804e23b800: fb fb fb fb fc fc fc fc fc fc fc fc fc fc 00 00 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
