RAX: ffffffffffffffda RBX: 00007f867a225fa0 RCX: 00007f8679f9f559 RDX: 00000000000001c0 RSI: 00000000000a23c6 RDI: 0000200000000640 RBP: 00007f867a036b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f867a226038 R14: 00007f867a225fa0 R15: 00007ffc082322f8 ================================================================== BUG: KASAN: slab-use-after-free in jffs2_xattr_delete_inode+0x2c8/0x2d0 fs/jffs2/xattr.c:602 Read of size 4 at addr ffff88805a965c68 by task syz.1.3752/19558 CPU: 1 UID: 0 PID: 19558 Comm: syz.1.3752 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 jffs2_xattr_delete_inode+0x2c8/0x2d0 fs/jffs2/xattr.c:602 jffs2_do_clear_inode+0x58/0x390 fs/jffs2/readinode.c:1418 evict+0x624/0xb50 fs/inode.c:822 jffs2_new_inode+0x48a/0xd20 fs/jffs2/fs.c:-1 jffs2_create+0x87/0x320 fs/jffs2/dir.c:182 lookup_open+0xedc/0x1970 fs/namei.c:4575 open_last_lookups fs/namei.c:4774 [inline] path_openat+0x70c/0x20f0 fs/namei.c:5013 do_file_open+0x23e/0x4a0 fs/namei.c:5045 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_open fs/open.c:1780 [inline] __se_sys_open fs/open.c:1776 [inline] __x64_sys_open+0x11e/0x150 fs/open.c:1776 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8679f9f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f867ae90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f867a225fa0 RCX: 00007f8679f9f559 RDX: 00000000000001c0 RSI: 00000000000a23c6 RDI: 0000200000000640 RBP: 00007f867a036b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f867a226038 R14: 00007f867a225fa0 R15: 00007ffc082322f8 Allocated by task 9841: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:351 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047 jffs2_scan_make_ino_cache+0x89/0x1d0 fs/jffs2/scan.c:978 jffs2_scan_dirent_node fs/jffs2/scan.c:1099 [inline] jffs2_scan_eraseblock fs/jffs2/scan.c:831 [inline] jffs2_scan_medium+0x2d23/0x7240 fs/jffs2/scan.c:151 jffs2_build_filesystem fs/jffs2/build.c:112 [inline] jffs2_do_mount_fs+0x775/0x22b0 fs/jffs2/build.c:416 jffs2_do_fill_super+0x555/0xc60 fs/jffs2/fs.c:574 mtd_get_sb+0x195/0x420 drivers/mtd/mtdsuper.c:59 get_tree_mtd+0x597/0x7d0 drivers/mtd/mtdsuper.c:143 vfs_get_tree+0x92/0x2a0 fs/super.c:1881 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3986 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 7717: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6757 jffs2_free_ino_caches+0xec/0x1c0 fs/jffs2/nodelist.c:497 jffs2_put_super+0x6c/0x170 fs/jffs2/super.c:335 generic_shutdown_super+0x140/0x2d0 fs/super.c:723 kill_mtd_super+0x23/0x70 drivers/mtd/mtdsuper.c:176 jffs2_kill_sb+0x96/0xb0 fs/jffs2/super.c:350 deactivate_locked_super+0xbe/0x110 fs/super.c:558 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1396 task_work_run+0x1d9/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805a965c40 which belongs to the cache jffs2_inode_cache of size 48 The buggy address is located 40 bytes inside of freed 48-byte region [ffff88805a965c40, ffff88805a965c70) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805a965400 pfn:0x5a965 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801df32b40 ffff88801ff92048 ffffea0000d265d0 raw: ffff88805a965400 000000020040002e 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8169, tgid 8168 (syz.3.690), ts 224548408024 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3938 __alloc_frozen_pages_noprof+0x1fe/0x410 mm/page_alloc.c:5447 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] kmem_cache_alloc_noprof+0x394/0x600 mm/slub.c:5047 jffs2_scan_make_ino_cache+0x89/0x1d0 fs/jffs2/scan.c:978 jffs2_scan_inode_node fs/jffs2/scan.c:1025 [inline] jffs2_scan_eraseblock fs/jffs2/scan.c:814 [inline] jffs2_scan_medium+0x35ac/0x7240 fs/jffs2/scan.c:151 jffs2_build_filesystem fs/jffs2/build.c:112 [inline] jffs2_do_mount_fs+0x775/0x22b0 fs/jffs2/build.c:416 jffs2_do_fill_super+0x555/0xc60 fs/jffs2/fs.c:574 mtd_get_sb+0x195/0x420 drivers/mtd/mtdsuper.c:59 get_tree_mtd+0x597/0x7d0 drivers/mtd/mtdsuper.c:143 vfs_get_tree+0x92/0x2a0 fs/super.c:1881 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3986 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4542 page last free pid 8167 tgid 8166 ts 224539019142 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1403 [inline] __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2957 tlb_batch_list_free mm/mmu_gather.c:161 [inline] tlb_finish_mmu+0x13e/0x220 mm/mmu_gather.c:532 exit_mmap+0x4b2/0xa40 mm/mmap.c:1328 __mmput+0x118/0x420 kernel/fork.c:1192 exit_mm+0x18e/0x240 kernel/exit.c:586 do_exit+0x6a8/0x2360 kernel/exit.c:967 do_group_exit+0x22d/0x2f0 kernel/exit.c:1123 get_signal+0x136a/0x1430 kernel/signal.c:3113 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88805a965b00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ffff88805a965b80: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc >ffff88805a965c00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ^ ffff88805a965c80: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ffff88805a965d00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ==================================================================