syzbot has found a reproducer for the following issue on: HEAD commit: 11a299a7933e Merge tag 'for-6.12/block-20240925' of git://.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1378aaa9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=31f49563bb05c4a8 dashboard link: https://syzkaller.appspot.com/bug?extid=1a28995e12fd13faa44e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164f7627980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10923a80580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e97035004495/disk-11a299a7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0be318a25b1d/vmlinux-11a299a7.xz kernel image: https://storage.googleapis.com/syzbot-assets/91f17271baa3/bzImage-11a299a7.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/971400d21e6d/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1a28995e12fd13faa44e@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: KASAN: slab-use-after-free in xfs_inode_item_push+0x293/0x2e0 fs/xfs/xfs_inode_item.c:775 Read of size 8 at addr ffff8880774cfa70 by task xfsaild/loop2/10928 CPU: 1 UID: 0 PID: 10928 Comm: xfsaild/loop2 Not tainted 6.11.0-syzkaller-10669-g11a299a7933e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 xfs_inode_item_push+0x293/0x2e0 fs/xfs/xfs_inode_item.c:775 xfsaild_push_item fs/xfs/xfs_trans_ail.c:395 [inline] xfsaild_push fs/xfs/xfs_trans_ail.c:523 [inline] xfsaild+0x112a/0x2e00 fs/xfs/xfs_trans_ail.c:705 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Allocated by task 10907: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4142 xfs_inode_item_init+0x33/0xc0 fs/xfs/xfs_inode_item.c:870 xfs_trans_ijoin+0xeb/0x130 fs/xfs/libxfs/xfs_trans_inode.c:36 xfs_create+0x8a0/0xf60 fs/xfs/xfs_inode.c:720 xfs_generic_create+0x5d5/0xf50 fs/xfs/xfs_iops.c:213 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat+0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdir fs/namei.c:4300 [inline] __se_sys_mkdir fs/namei.c:4298 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4298 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5213: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2343 [inline] slab_free mm/slub.c:4580 [inline] kmem_cache_free+0x1a2/0x420 mm/slub.c:4682 xfs_inode_free_callback+0x152/0x1d0 fs/xfs/xfs_icache.c:158 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 The buggy address belongs to the object at ffff8880774cfa40 which belongs to the cache xfs_ili of size 264 The buggy address is located 48 bytes inside of freed 264-byte region [ffff8880774cfa40, ffff8880774cfb48) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x774cf ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888142abe140 ffffea0001d56080 0000000000000007 raw: 0000000000000000 00000000000c000c 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_RECLAIMABLE), pid 5289, tgid 5289 (syz-executor269), ts 76754520423, free_ts 21942205490 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3039/0x3180 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2413 allocate_slab+0x5a/0x2f0 mm/slub.c:2579 new_slab mm/slub.c:2632 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819 __slab_alloc+0x58/0xa0 mm/slub.c:3909 __slab_alloc_node mm/slub.c:3962 [inline] slab_alloc_node mm/slub.c:4123 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4142 xfs_inode_item_init+0x33/0xc0 fs/xfs/xfs_inode_item.c:870 xfs_trans_ijoin+0xeb/0x130 fs/xfs/libxfs/xfs_trans_inode.c:36 xfs_icreate+0x13a/0x1f0 fs/xfs/xfs_inode.c:593 xfs_symlink+0xa74/0x1230 fs/xfs/xfs_symlink.c:170 xfs_vn_symlink+0x1f5/0x740 fs/xfs/xfs_iops.c:443 vfs_symlink+0x137/0x2e0 fs/namei.c:4615 do_symlinkat+0x222/0x3a0 fs/namei.c:4641 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcd0/0xf00 mm/page_alloc.c:2638 free_contig_range+0x152/0x550 mm/page_alloc.c:6748 destroy_args+0x8a/0x840 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x880 init/main.c:1269 do_initcall_level+0x157/0x210 init/main.c:1331 do_initcalls+0x3f/0x80 init/main.c:1347 kernel_init_freeable+0x435/0x5d0 init/main.c:1580 kernel_init+0x1d/0x2b0 init/main.c:1469 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880774cf900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880774cf980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880774cfa00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff8880774cfa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880774cfb00: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
