EXT4-fs (loop2): 1 truncate cleaned up EXT4-fs (loop2): mounted filesystem without journal. Quota mode: none. ================================================================== BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline] BUG: KASAN: use-after-free in ext4_inlinedir_to_tree+0x503/0xfb0 fs/ext4/inline.c:1412 Read of size 68 at addr ffff88812154e719 by task syz.2.19/514 CPU: 0 PID: 514 Comm: syz.2.19 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memcpy+0x2d/0x70 mm/kasan/shadow.c:65 ext4_read_inline_data fs/ext4/inline.c:210 [inline] ext4_inlinedir_to_tree+0x503/0xfb0 fs/ext4/inline.c:1412 ext4_htree_fill_tree+0x516/0x10e0 fs/ext4/namei.c:1211 ext4_dx_readdir fs/ext4/dir.c:608 [inline] ext4_readdir+0x2d9f/0x3c10 fs/ext4/dir.c:145 iterate_dir+0x26d/0x610 fs/readdir.c:-1 __do_sys_getdents fs/readdir.c:286 [inline] __se_sys_getdents+0xf2/0x250 fs/readdir.c:271 __x64_sys_getdents+0x7b/0x90 fs/readdir.c:271 x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:79 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f393bf9e0d9 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:00007f393ce70028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f393c225fa0 RCX: 00007f393bf9e0d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f393c035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f393c226038 R14: 00007f393c225fa0 R15: 00007ffd4ea57538 The buggy address belongs to the physical page: page:ffffea0004855380 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12154e flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00042cd1c8 ffffea00048e5808 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 233, tgid 233 (sshd-session), ts 17939073308, free_ts 44383541928 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3e0 mm/slub.c:2020 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x1a8/0x320 mm/slub.c:3408 skb_clone+0x1e8/0x380 net/core/skbuff.c:1663 dev_queue_xmit_nit+0x245/0xab0 net/core/dev.c:2342 xmit_one net/core/dev.c:3699 [inline] dev_hard_start_xmit+0x15f/0x730 net/core/dev.c:3722 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3943 [inline] __dev_queue_xmit+0x163e/0x3540 net/core/dev.c:4348 dev_queue_xmit include/linux/netdevice.h:3085 [inline] neigh_resolve_output+0x6ee/0x7f0 net/core/neighbour.c:1563 neigh_output include/net/neighbour.h:552 [inline] ip_finish_output2+0xc6e/0xf50 net/ipv4/ip_output.c:228 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1581 [inline] free_pcp_prepare mm/page_alloc.c:1655 [inline] free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622 free_unref_page+0x93/0x530 mm/page_alloc.c:3720 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6021 __free_slab+0xc7/0x1a0 mm/slub.c:2044 free_slab mm/slub.c:2059 [inline] discard_slab mm/slub.c:2065 [inline] __unfreeze_partials+0x15a/0x190 mm/slub.c:2614 put_cpu_partial+0xa9/0x100 mm/slub.c:2690 __slab_free+0x1c4/0x280 mm/slub.c:3589 do_slab_free mm/slub.c:3666 [inline] ___cache_free+0xbf/0xd0 mm/slub.c:3722 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768 slab_alloc_node mm/slub.c:3382 [inline] kmem_cache_alloc_node+0x179/0x330 mm/slub.c:3429 __alloc_skb+0xe8/0x4a0 net/core/skbuff.c:508 alloc_skb include/linux/skbuff.h:1322 [inline] nlmsg_new include/net/netlink.h:987 [inline] inet_netconf_notify_devconf+0x169/0x220 net/ipv4/devinet.c:2128 __devinet_sysctl_unregister net/ipv4/devinet.c:2639 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2663 [inline] inetdev_destroy net/ipv4/devinet.c:329 [inline] inetdev_event+0x80a/0x10a0 net/ipv4/devinet.c:1615 Memory state around the buggy address: ffff88812154e600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812154e680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88812154e700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88812154e780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812154e800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop2): ext4_inlinedir_to_tree:1450: inode #12: block 7: comm syz.2.19: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=35245, inode=1221132332, rec_len=35241, size=128 fake=0