BTRFS info (device loop2 state EA): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d ================================================================== BUG: KASAN: slab-use-after-free in rb_left_deepest_node lib/rbtree.c:595 [inline] BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 lib/rbtree.c:628 Read of size 8 at addr ffff8880608fb010 by task syz-executor/6363 CPU: 0 UID: 0 PID: 6363 Comm: syz-executor Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __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 rb_left_deepest_node lib/rbtree.c:595 [inline] rb_first_postorder+0x69/0x90 lib/rbtree.c:628 btrfs_cleanup_defrag_inodes+0x2f/0x80 fs/btrfs/defrag.c:212 close_ctree+0x2af/0xd20 fs/btrfs/disk-io.c:4256 generic_shutdown_super+0x139/0x2d0 fs/super.c:642 kill_anon_super+0x3b/0x70 fs/super.c:1237 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 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 RIP: 0033:0x7f9c3a77def9 Code: Unable to access opcode bytes at 0x7f9c3a77decf. RSP: 002b:00007fffaf820138 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f9c3a7f0a86 RCX: 00007f9c3a77def9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000010 R08: 00007fffaf81ded6 R09: 00007fffaf8213f0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffaf8213f0 R13: 00007f9c3a7f0a14 R14: 000055557c5304a8 R15: 00007fffaf8224b0 Allocated by task 6810: 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 btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136 inode_should_defrag fs/btrfs/inode.c:888 [inline] cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382 btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334 writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192 extent_writepage fs/btrfs/extent_io.c:1454 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline] btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261 do_writepages+0x35d/0x870 mm/page-writeback.c:2683 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398 __filemap_fdatawrite_range mm/filemap.c:431 [inline] filemap_fdatawrite_range+0x11a/0x180 mm/filemap.c:449 btrfs_fdatawrite_range fs/btrfs/file.c:3799 [inline] start_ordered_ops fs/btrfs/file.c:1563 [inline] btrfs_sync_file+0x3ac/0x1230 fs/btrfs/file.c:1645 generic_write_sync include/linux/fs.h:2870 [inline] btrfs_do_write_iter+0x5e0/0x760 fs/btrfs/file.c:1515 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xa6d/0xc90 fs/read_write.c:683 ksys_pwrite64 fs/read_write.c:798 [inline] __do_sys_pwrite64 fs/read_write.c:808 [inline] __se_sys_pwrite64 fs/read_write.c:805 [inline] __x64_sys_pwrite64+0x1aa/0x230 fs/read_write.c:805 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 6760: 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 btrfs_cleanup_defrag_inodes+0x51/0x80 fs/btrfs/defrag.c:214 btrfs_remount_cleanup fs/btrfs/super.c:1263 [inline] btrfs_reconfigure+0x269c/0x2d40 fs/btrfs/super.c:1555 reconfigure_super+0x445/0x880 fs/super.c:1083 do_remount fs/namespace.c:3047 [inline] path_mount+0xc22/0xfa0 fs/namespace.c:3826 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 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 The buggy address belongs to the object at ffff8880608fb000 which belongs to the cache btrfs_inode_defrag of size 56 The buggy address is located 16 bytes inside of freed 56-byte region [ffff8880608fb000, ffff8880608fb038) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x608fb flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88814c8a8000 dead000000000122 0000000000000000 raw: 0000000000000000 00000000802e002e 00000001f5000000 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6810, tgid 6759 (syz.2.161), ts 180836206415, free_ts 180827612321 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 btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136 inode_should_defrag fs/btrfs/inode.c:888 [inline] cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382 btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334 writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192 extent_writepage fs/btrfs/extent_io.c:1454 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline] btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261 do_writepages+0x35d/0x870 mm/page-writeback.c:2683 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398 page last free pid 6810 tgid 6759 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_folios+0xee2/0x18a0 mm/page_alloc.c:2686 folios_put_refs+0x76c/0x860 mm/swap.c:1007 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 vms_clear_ptes+0x437/0x530 mm/vma.c:1096 vms_complete_munmap_vmas+0x208/0x910 mm/vma.c:1140 do_vmi_align_munmap+0x613/0x730 mm/vma.c:1349 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1397 __vm_munmap+0x24c/0x480 mm/mmap.c:1600 __do_sys_munmap mm/mmap.c:1617 [inline] __se_sys_munmap mm/mmap.c:1614 [inline] __x64_sys_munmap+0x68/0x80 mm/mmap.c:1614 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 Memory state around the buggy address: ffff8880608faf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880608faf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880608fb000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ^ ffff8880608fb080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880608fb100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================