loop4: detected capacity change from 0 to 32768 ERROR: (device loop4): duplicateIXtree: ERROR: (device loop4): remounting filesystem as read-only ================================================================== BUG: KASAN: slab-use-after-free in drop_metapage fs/jfs/jfs_metapage.c:311 [inline] BUG: KASAN: slab-use-after-free in release_metapage+0x760/0xac0 fs/jfs/jfs_metapage.c:890 Read of size 8 at addr ffff888077d908e0 by task syz.4.29/6117 CPU: 0 UID: 0 PID: 6117 Comm: syz.4.29 Not tainted 6.16.0-rc5-syzkaller-00266-g3f31a806a62e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x230 mm/kasan/report.c:480 kasan_report+0x118/0x150 mm/kasan/report.c:593 drop_metapage fs/jfs/jfs_metapage.c:311 [inline] release_metapage+0x760/0xac0 fs/jfs/jfs_metapage.c:890 write_metapage fs/jfs/jfs_metapage.h:75 [inline] flush_metapage fs/jfs/jfs_metapage.h:81 [inline] ea_put fs/jfs/xattr.c:623 [inline] __jfs_setxattr+0xa6e/0x1120 fs/jfs/xattr.c:792 jfs_initxattrs+0x18c/0x260 fs/jfs/xattr.c:1040 security_inode_init_security+0x29d/0x3f0 security/security.c:1852 jfs_init_security+0x91/0xe0 fs/jfs/xattr.c:1052 jfs_mkdir+0x28d/0xa70 fs/jfs/namei.c:240 vfs_mkdir+0x306/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdir fs/namei.c:4430 [inline] __se_sys_mkdir fs/namei.c:4428 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4428 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: 0033:0x7fb402f8e929 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:00007fb403d93038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fb4031b5fa0 RCX: 00007fb402f8e929 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000200000000000 RBP: 00007fb403010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb4031b5fa0 R15: 00007ffc37721428 Allocated by task 6117: 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:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204 mempool_alloc_noprof+0x1a4/0x510 mm/mempool.c:402 alloc_metapage fs/jfs/jfs_metapage.c:264 [inline] __get_metapage+0x509/0xde0 fs/jfs/jfs_metapage.c:758 ea_get+0xb8e/0x1330 fs/jfs/xattr.c:528 __jfs_setxattr+0x57c/0x1120 fs/jfs/xattr.c:727 jfs_initxattrs+0x18c/0x260 fs/jfs/xattr.c:1040 security_inode_init_security+0x29d/0x3f0 security/security.c:1852 jfs_init_security+0x91/0xe0 fs/jfs/xattr.c:1052 jfs_mkdir+0x28d/0xa70 fs/jfs/namei.c:240 vfs_mkdir+0x306/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdir fs/namei.c:4430 [inline] __se_sys_mkdir fs/namei.c:4428 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4428 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 6124: 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:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kmem_cache_free+0x18f/0x400 mm/slub.c:4745 free_metapage fs/jfs/jfs_metapage.c:279 [inline] metapage_release_folio+0x40e/0x540 fs/jfs/jfs_metapage.c:634 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d5/0x430 mm/truncate.c:160 truncate_inode_folio mm/truncate.c:175 [inline] truncate_inode_pages_range+0xb1c/0xda0 mm/truncate.c:436 jfs_reconfigure+0x5ac/0xa00 fs/jfs/super.c:406 reconfigure_super+0x224/0x890 fs/super.c:1077 do_remount fs/namespace.c:3386 [inline] path_mount+0xd18/0xfe0 fs/namespace.c:4218 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 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 The buggy address belongs to the object at ffff888077d908b8 which belongs to the cache jfs_mp of size 184 The buggy address is located 40 bytes inside of freed 184-byte region [ffff888077d908b8, ffff888077d90970) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77d90 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff8881472b63c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6117, tgid 6116 (syz.4.29), ts 106618891417, free_ts 106605614535 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4204 mempool_alloc_noprof+0x1a4/0x510 mm/mempool.c:402 alloc_metapage fs/jfs/jfs_metapage.c:264 [inline] __get_metapage+0x509/0xde0 fs/jfs/jfs_metapage.c:758 diReadSpecial+0x25b/0x710 fs/jfs/jfs_imap.c:447 duplicateIXtree+0x10d/0x490 fs/jfs/jfs_imap.c:2993 diNewIAG fs/jfs/jfs_imap.c:2597 [inline] diAllocExt fs/jfs/jfs_imap.c:1905 [inline] diAllocAG+0x17a7/0x1df0 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x193/0xa70 fs/jfs/namei.c:225 vfs_mkdir+0x306/0x510 fs/namei.c:4375 page last free pid 5976 tgid 5976 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc65/0xe60 mm/page_alloc.c:2706 discard_slab mm/slub.c:2717 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3186 put_cpu_partial+0x17c/0x250 mm/slub.c:3261 __slab_free+0x2f7/0x400 mm/slub.c:4513 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204 getname_flags+0xb8/0x540 fs/namei.c:146 do_readlinkat+0xbc/0x500 fs/stat.c:575 __do_sys_readlink fs/stat.c:613 [inline] __se_sys_readlink fs/stat.c:610 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:610 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 Memory state around the buggy address: ffff888077d90780: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888077d90800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc >ffff888077d90880: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb ^ ffff888077d90900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff888077d90980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================