loop2: detected capacity change from 0 to 1024 EXT4-fs (loop2): mounted filesystem without journal. Opts: resgid=0x000000000000ee00,bsddf,grpquota,nojournal_checksum,debug_want_extra_isize=0x0000000000000080,delalloc,nogrpid,noauto_da_alloc,stripe=0x0000000000000002,,errors=continue. Quota mode: writeback. ================================================================== BUG: KASAN: use-after-free in xattr_find_entry fs/ext4/xattr.c:294 [inline] BUG: KASAN: use-after-free in ext4_xattr_ibody_get+0x606/0x670 fs/ext4/xattr.c:601 Read of size 4 at addr ffff88811db39004 by task syz.2.17/373 CPU: 0 PID: 373 Comm: syz.2.17 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 xattr_find_entry fs/ext4/xattr.c:294 [inline] ext4_xattr_ibody_get+0x606/0x670 fs/ext4/xattr.c:601 ext4_xattr_get+0x116/0x830 fs/ext4/xattr.c:655 ext4_get_acl+0x85/0x6c0 fs/ext4/acl.c:165 get_acl+0x161/0x270 fs/posix_acl.c:153 posix_acl_chmod+0xe9/0x250 fs/posix_acl.c:602 ext4_setattr+0xb6b/0x1b10 fs/ext4/inode.c:5672 notify_change+0xc30/0xf40 fs/attr.c:505 chmod_common+0x21a/0x3c0 fs/open.c:583 do_fchmodat+0xd4/0x1a0 fs/open.c:622 __do_sys_chmod fs/open.c:640 [inline] __se_sys_chmod fs/open.c:638 [inline] __x64_sys_chmod+0x60/0x70 fs/open.c:638 x64_sys_call+0xad/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:91 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: 0033:0x7f04b5b52e59 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:00007ffd61043b18 EFLAGS: 00000246 ORIG_RAX: 000000000000005a RAX: ffffffffffffffda RBX: 00007f04b5dcbfa0 RCX: 00007f04b5b52e59 RDX: 0000000000000000 RSI: 000000000000023f RDI: 0000200000000180 RBP: 00007f04b5be8e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f04b5dcbfac R14: 00007f04b5dcbfa0 R15: 00007f04b5dcbfa0 Allocated by task 230: 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 skb_clone+0x1c7/0x370 net/core/skbuff.c:1547 dev_queue_xmit_nit+0x353/0x9c0 net/core/dev.c:2362 xmit_one net/core/dev.c:3665 [inline] dev_hard_start_xmit+0x163/0x680 net/core/dev.c:3686 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3905 [inline] __dev_queue_xmit+0x14f1/0x2d60 net/core/dev.c:4274 dev_queue_xmit+0x17/0x20 net/core/dev.c:4355 neigh_hh_output include/net/neighbour.h:501 [inline] neigh_output include/net/neighbour.h:515 [inline] ip_finish_output2+0xb1f/0xec0 net/ipv4/ip_output.c:228 __ip_finish_output+0x161/0x360 net/ipv4/ip_output.c:-1 ip_finish_output+0x31/0x220 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x1ea/0x390 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:453 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x10ca/0x1c30 net/ipv4/ip_output.c:538 ip_queue_xmit+0x4d/0x70 net/ipv4/ip_output.c:552 __tcp_transmit_skb+0x1e23/0x35f0 net/ipv4/tcp_output.c:1404 __tcp_send_ack+0x2f0/0x6c0 net/ipv4/tcp_output.c:4023 tcp_send_ack+0x3b/0x60 net/ipv4/tcp_output.c:4029 tcp_cleanup_rbuf+0x281/0x5b0 net/ipv4/tcp.c:1600 tcp_recvmsg_locked+0x1c95/0x24f0 net/ipv4/tcp.c:2536 tcp_recvmsg+0x233/0x770 net/ipv4/tcp.c:2566 inet_recvmsg+0x13a/0x470 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:966 [inline] sock_recvmsg net/socket.c:984 [inline] sock_read_iter+0x2c2/0x380 net/socket.c:1057 call_read_iter include/linux/fs.h:2206 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x6c0/0xc20 fs/read_write.c:485 ksys_read+0x14a/0x260 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 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 230: 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 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1 __kfree_skb net/core/skbuff.c:758 [inline] consume_skb+0xb3/0x1f0 net/core/skbuff.c:930 packet_rcv+0x16e/0x1310 net/packet/af_packet.c:2243 dev_queue_xmit_nit+0x939/0x9c0 net/core/dev.c:2394 xmit_one net/core/dev.c:3665 [inline] dev_hard_start_xmit+0x163/0x680 net/core/dev.c:3686 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3905 [inline] __dev_queue_xmit+0x14f1/0x2d60 net/core/dev.c:4274 dev_queue_xmit+0x17/0x20 net/core/dev.c:4355 neigh_hh_output include/net/neighbour.h:501 [inline] neigh_output include/net/neighbour.h:515 [inline] ip_finish_output2+0xb1f/0xec0 net/ipv4/ip_output.c:228 __ip_finish_output+0x161/0x360 net/ipv4/ip_output.c:-1 ip_finish_output+0x31/0x220 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x1ea/0x390 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:453 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x10ca/0x1c30 net/ipv4/ip_output.c:538 ip_queue_xmit+0x4d/0x70 net/ipv4/ip_output.c:552 __tcp_transmit_skb+0x1e23/0x35f0 net/ipv4/tcp_output.c:1404 __tcp_send_ack+0x2f0/0x6c0 net/ipv4/tcp_output.c:4023 tcp_send_ack+0x3b/0x60 net/ipv4/tcp_output.c:4029 tcp_cleanup_rbuf+0x281/0x5b0 net/ipv4/tcp.c:1600 tcp_recvmsg_locked+0x1c95/0x24f0 net/ipv4/tcp.c:2536 tcp_recvmsg+0x233/0x770 net/ipv4/tcp.c:2566 inet_recvmsg+0x13a/0x470 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:966 [inline] sock_recvmsg net/socket.c:984 [inline] sock_read_iter+0x2c2/0x380 net/socket.c:1057 call_read_iter include/linux/fs.h:2206 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x6c0/0xc20 fs/read_write.c:485 ksys_read+0x14a/0x260 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 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 ffff88811db39000 which belongs to the cache skbuff_head_cache of size 248 The buggy address is located 4 bytes inside of 248-byte region [ffff88811db39000, ffff88811db390f8) The buggy address belongs to the page: page:ffffea000476ce40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11db39 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881081aa000 raw: 0000000000000000 00000000000c000c 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 230, ts 15800901614, free_ts 15168772120 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 skb_clone+0x1c7/0x370 net/core/skbuff.c:1547 dev_queue_xmit_nit+0x353/0x9c0 net/core/dev.c:2362 xmit_one net/core/dev.c:3665 [inline] dev_hard_start_xmit+0x163/0x680 net/core/dev.c:3686 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3905 [inline] __dev_queue_xmit+0x14f1/0x2d60 net/core/dev.c:4274 dev_queue_xmit+0x17/0x20 net/core/dev.c:4355 neigh_hh_output include/net/neighbour.h:501 [inline] neigh_output include/net/neighbour.h:515 [inline] ip_finish_output2+0xb1f/0xec0 net/ipv4/ip_output.c:228 __ip_finish_output+0x161/0x360 net/ipv4/ip_output.c:-1 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+0xae/0x540 mm/page_alloc.c:3618 __put_single_page mm/swap.c:98 [inline] __put_page+0xad/0xe0 mm/swap.c:129 put_page include/linux/mm.h:1306 [inline] anon_pipe_buf_release+0x15f/0x1d0 fs/pipe.c:137 pipe_buf_release include/linux/pipe_fs_i.h:219 [inline] pipe_read+0x563/0x1050 fs/pipe.c:323 call_read_iter include/linux/fs.h:2206 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x6c0/0xc20 fs/read_write.c:485 ksys_read+0x14a/0x260 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 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 Memory state around the buggy address: ffff88811db38f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811db38f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811db39000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811db39080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ffff88811db39100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop2): xattr_find_entry:297: inode #12: comm syz.2.17: corrupted xattr entries