EXT4-fs error (device loop2): ext4_lookup:1858: inode #15: comm syz.2.358: iget: bad extra_isize 46710 (inode size 256) EXT4-fs (loop2): Remounting filesystem read-only ================================================================== BUG: KASAN: slab-out-of-bounds in ext4_xattr_list_entries fs/ext4/xattr.c:670 [inline] BUG: KASAN: slab-out-of-bounds in ext4_xattr_ibody_list fs/ext4/xattr.c:740 [inline] BUG: KASAN: slab-out-of-bounds in ext4_listxattr+0x4a9/0xc60 fs/ext4/xattr.c:765 Read of size 4 at addr ffff8881372e60b0 by task syz.2.358/1643 CPU: 1 PID: 1643 Comm: syz.2.358 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_xattr_list_entries fs/ext4/xattr.c:670 [inline] ext4_xattr_ibody_list fs/ext4/xattr.c:740 [inline] ext4_listxattr+0x4a9/0xc60 fs/ext4/xattr.c:765 vfs_listxattr fs/xattr.c:448 [inline] listxattr+0x28f/0x300 fs/xattr.c:783 path_listxattr+0xe1/0x1b0 fs/xattr.c:807 __do_sys_llistxattr fs/xattr.c:825 [inline] __se_sys_llistxattr fs/xattr.c:822 [inline] __x64_sys_llistxattr+0x7d/0x90 fs/xattr.c:822 x64_sys_call+0x584/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:196 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc978e2de59 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:00007fc977888028 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3 RAX: ffffffffffffffda RBX: 00007fc9790a6fa0 RCX: 00007fc978e2de59 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000001c0 RBP: 00007fc978ec3e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc9790a7038 R14: 00007fc9790a6fa0 R15: 00007ffdae635fb8 Allocated by task 363: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 kmem_cache_zalloc include/linux/slab.h:740 [inline] avc_alloc_node+0x83/0x4b0 security/selinux/avc.c:509 avc_insert security/selinux/avc.c:637 [inline] avc_compute_av+0x142/0x820 security/selinux/avc.c:1009 avc_has_perm_noaudit+0x2cb/0x490 security/selinux/avc.c:1152 selinux_inode_permission+0x3b8/0x5f0 security/selinux/hooks.c:3216 security_inode_permission+0xa0/0x100 security/security.c:1330 inode_permission+0xef/0x4a0 fs/namei.c:534 may_lookup fs/namei.c:1697 [inline] link_path_walk+0x29a/0xde0 fs/namei.c:2253 path_parentat fs/namei.c:2510 [inline] __filename_parentat+0x254/0x690 fs/namei.c:2534 filename_parentat fs/namei.c:2552 [inline] do_unlinkat+0xeb/0x6c0 fs/namei.c:4327 __do_sys_unlink fs/namei.c:4404 [inline] __se_sys_unlink fs/namei.c:4402 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4402 x64_sys_call+0x878/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 13: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kmem_cache_free+0x100/0x320 mm/slub.c:3544 avc_node_free+0x4d/0x60 security/selinux/avc.c:441 rcu_do_batch+0x4c1/0xbf0 kernel/rcu/tree.c:2523 rcu_core+0x4a3/0xef0 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x250/0x560 kernel/softirq.c:583 run_ksoftirqd+0x28/0x40 kernel/softirq.c:959 smpboot_thread_fn+0x446/0x880 kernel/smpboot.c:164 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x10b/0xf60 kernel/rcu/tree.c:3129 avc_node_delete security/selinux/avc.c:449 [inline] avc_reclaim_node security/selinux/avc.c:489 [inline] avc_alloc_node+0x2e2/0x4b0 security/selinux/avc.c:518 avc_insert security/selinux/avc.c:637 [inline] avc_compute_av+0x142/0x820 security/selinux/avc.c:1009 avc_has_perm_noaudit+0x2cb/0x490 security/selinux/avc.c:1152 selinux_inode_permission+0x3b8/0x5f0 security/selinux/hooks.c:3216 security_inode_permission+0xa0/0x100 security/security.c:1330 inode_permission+0xef/0x4a0 fs/namei.c:534 may_lookup fs/namei.c:1697 [inline] link_path_walk+0x29a/0xde0 fs/namei.c:2253 path_lookupat+0x8d/0x430 fs/namei.c:2462 filename_lookup+0x21e/0x550 fs/namei.c:2492 user_path_at_empty+0x46/0x1c0 fs/namei.c:2891 do_readlinkat+0xd9/0x490 fs/stat.c:442 __do_sys_readlink fs/stat.c:475 [inline] __se_sys_readlink fs/stat.c:472 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:472 x64_sys_call+0x93c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:90 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff8881372e6068 which belongs to the cache avc_node of size 72 The buggy address is located 0 bytes to the right of 72-byte region [ffff8881372e6068, ffff8881372e60b0) The buggy address belongs to the page: page:ffffea0004dcb980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1372e6 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100186780 raw: 0000000000000000 0000000000270027 00000001ffffffff 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 0x112800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 434, ts 73178449894, free_ts 73087245711 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0x138/0x260 mm/slub.c:3260 kmem_cache_zalloc include/linux/slab.h:740 [inline] avc_alloc_node+0x83/0x4b0 security/selinux/avc.c:509 avc_insert security/selinux/avc.c:637 [inline] avc_compute_av+0x142/0x820 security/selinux/avc.c:1009 avc_has_perm_noaudit+0x2cb/0x490 security/selinux/avc.c:1152 selinux_inode_permission+0x3b8/0x5f0 security/selinux/hooks.c:3216 security_inode_permission+0xa0/0x100 security/security.c:1330 inode_permission+0xef/0x4a0 fs/namei.c:534 may_lookup fs/namei.c:1701 [inline] link_path_walk+0x2ef/0xde0 fs/namei.c:2253 path_openat+0x282/0x2f80 fs/namei.c:3746 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page_list+0x138/0x9e0 mm/page_alloc.c:3673 release_pages+0x1264/0x12c0 mm/swap.c:1015 __pagevec_release+0x71/0xe0 mm/swap.c:1035 pagevec_release include/linux/pagevec.h:81 [inline] truncate_inode_pages_range+0x358/0xe50 mm/truncate.c:332 truncate_inode_pages+0x24/0x30 mm/truncate.c:428 kill_bdev block/bdev.c:80 [inline] blkdev_flush_mapping+0x188/0x360 block/bdev.c:663 blkdev_put_whole block/bdev.c:694 [inline] blkdev_put+0x494/0x7a0 block/bdev.c:961 kill_block_super+0xb8/0xf0 fs/super.c:1430 kill_f2fs_super+0x30a/0x3d0 fs/f2fs/super.c:4740 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 Memory state around the buggy address: ffff8881372e5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881372e6000: fa fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb >ffff8881372e6080: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ^ ffff8881372e6100: fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb ffff8881372e6180: fc fc fc fc fa fb fb fb fb fb fb fb fb fc fc fc ==================================================================