BTRFS info (device loop4 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 ffff888027444010 by task syz-executor/5770 CPU: 1 UID: 0 PID: 5770 Comm: syz-executor Not tainted 6.11.0-syzkaller-07341-gbaeb9a7d8b60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 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: 0033:0x7fa4a177def9 Code: Unable to access opcode bytes at 0x7fa4a177decf. RSP: 002b:00007ffcc199adf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fa4a17f0a86 RCX: 00007fa4a177def9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000010 R08: 00007ffcc1998b96 R09: 00007ffcc199c0b0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcc199c0b0 R13: 00007fa4a17f0a14 R14: 0000555584f5f4a8 R15: 00007ffcc199d170 Allocated by task 2504: 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 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658 writeback_sb_inodes+0x812/0x1370 fs/fs-writeback.c:1954 wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134 wb_do_writeback fs/fs-writeback.c:2281 [inline] wb_workfn+0x410/0x1090 fs/fs-writeback.c:2321 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 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 Freed by task 6578: 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+0x1a3/0x420 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 ffff888027444000 which belongs to the cache btrfs_inode_defrag of size 56 The buggy address is located 16 bytes inside of freed 56-byte region [ffff888027444000, ffff888027444038) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27444 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff88814b1f8500 dead000000000122 0000000000000000 raw: 0000000000000000 00000000802e002e 00000001fdffffff 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 2504, tgid 2504 (kworker/u8:7), ts 148064724363, free_ts 148041504566 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263 alloc_slab_page+0x6a/0x130 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 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658 page last free pid 6615 tgid 6615 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619 __slab_free+0x31b/0x3d0 mm/slub.c:4491 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 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] __kmalloc_cache_noprof+0x132/0x2c0 mm/slub.c:4291 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1004 [inline] kernfs_fop_open+0x3e0/0xd10 fs/kernfs/file.c:623 do_dentry_open+0x978/0x1460 fs/open.c:958 vfs_open+0x3e/0x330 fs/open.c:1088 do_open fs/namei.c:3774 [inline] path_openat+0x2c84/0x3590 fs/namei.c:3933 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1441 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: ffff888027443f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888027443f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888027444000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ^ ffff888027444080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027444100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================