syzbot

loop0: detected capacity change from 0 to 32768
bcachefs: bch2_parse_one_mount_opt() Invalid mount option move_bytes_in_flight: must be a number
loop0: detected capacity change from 0 to 32768
BTRFS: device fsid ed167579-eb65-4e76-9a50-61ac97e9b59d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5315)
BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
BTRFS info (device loop0): using sha256 (sha256-avx2) checksum algorithm
BTRFS info (device loop0): rebuilding free space tree
BTRFS info (device loop0): disabling free space tree
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
fs-verity: sha512 using implementation "sha512-avx2"
==================================================================
BUG: KASAN: slab-use-after-free in do_perf_trace_btrfs_delayed_tree_ref include/trace/events/btrfs.h:856 [inline]
BUG: KASAN: slab-use-after-free in perf_trace_btrfs_delayed_tree_ref+0x2fc/0x670 include/trace/events/btrfs.h:856
Read of size 8 at addr ffff888040fe99c8 by task syz.0.0/5315

CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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:408 [inline]
 print_report+0x16e/0x5b0 mm/kasan/report.c:521
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 do_perf_trace_btrfs_delayed_tree_ref include/trace/events/btrfs.h:856 [inline]
 perf_trace_btrfs_delayed_tree_ref+0x2fc/0x670 include/trace/events/btrfs.h:856
 __do_trace_add_delayed_tree_ref include/trace/events/btrfs.h:897 [inline]
 trace_add_delayed_tree_ref include/trace/events/btrfs.h:897 [inline]
 add_delayed_ref+0x1d72/0x1e90 fs/btrfs/delayed-ref.c:1071
 btrfs_free_tree_block+0x361/0xd10 fs/btrfs/extent-tree.c:3432
 btrfs_force_cow_block+0xd7f/0x2010 fs/btrfs/ctree.c:583
 btrfs_cow_block+0x377/0x840 fs/btrfs/ctree.c:688
 push_leaf_left+0x449/0x740 fs/btrfs/ctree.c:3482
 split_leaf+0x54c/0x1960 fs/btrfs/ctree.c:3678
 search_leaf fs/btrfs/ctree.c:1933 [inline]
 btrfs_search_slot+0x2835/0x31c0 fs/btrfs/ctree.c:2124
 btrfs_insert_empty_items+0x9c/0x1a0 fs/btrfs/ctree.c:4287
 btrfs_insert_empty_item fs/btrfs/ctree.h:673 [inline]
 write_key_bytes+0x31c/0x5f0 fs/btrfs/verity.c:251
 write_merkle_tree_block fs/verity/enable.c:56 [inline]
 build_merkle_tree fs/verity/enable.c:143 [inline]
 enable_verity+0xe72/0x1c90 fs/verity/enable.c:253
 fsverity_ioctl_enable+0x474/0x5c0 fs/verity/enable.c:378
 btrfs_ioctl+0xae2/0xcf0 fs/btrfs/ioctl.c:5353
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f413a98d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f413b7e0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f413aba5fa0 RCX: 00007f413a98d169
RDX: 0000200000000a80 RSI: 0000000040806685 RDI: 0000000000000007
RBP: 00007f413aa0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f413aba5fa0 R15: 00007ffeb30b9838
 </TASK>

Allocated by task 5315:
 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:250 [inline]
 slab_post_alloc_hook mm/slub.c:4138 [inline]
 slab_alloc_node mm/slub.c:4187 [inline]
 kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4194
 add_delayed_ref+0x1a0/0x1e90 fs/btrfs/delayed-ref.c:1007
 btrfs_free_tree_block+0x361/0xd10 fs/btrfs/extent-tree.c:3432
 btrfs_force_cow_block+0xd7f/0x2010 fs/btrfs/ctree.c:583
 btrfs_cow_block+0x377/0x840 fs/btrfs/ctree.c:688
 push_leaf_left+0x449/0x740 fs/btrfs/ctree.c:3482
 split_leaf+0x54c/0x1960 fs/btrfs/ctree.c:3678
 search_leaf fs/btrfs/ctree.c:1933 [inline]
 btrfs_search_slot+0x2835/0x31c0 fs/btrfs/ctree.c:2124
 btrfs_insert_empty_items+0x9c/0x1a0 fs/btrfs/ctree.c:4287
 btrfs_insert_empty_item fs/btrfs/ctree.h:673 [inline]
 write_key_bytes+0x31c/0x5f0 fs/btrfs/verity.c:251
 write_merkle_tree_block fs/verity/enable.c:56 [inline]
 build_merkle_tree fs/verity/enable.c:143 [inline]
 enable_verity+0xe72/0x1c90 fs/verity/enable.c:253
 fsverity_ioctl_enable+0x474/0x5c0 fs/verity/enable.c:378
 btrfs_ioctl+0xae2/0xcf0 fs/btrfs/ioctl.c:5353
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5316:
 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:576
 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:233 [inline]
 slab_free_hook mm/slub.c:2376 [inline]
 slab_free mm/slub.c:4633 [inline]
 kmem_cache_free+0x197/0x410 mm/slub.c:4735
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1988 [inline]
 __btrfs_run_delayed_refs+0x1bbd/0x4100 fs/btrfs/extent-tree.c:2046
 btrfs_run_delayed_refs+0xe3/0x2f0 fs/btrfs/extent-tree.c:2158
 btrfs_commit_transaction+0x4d4/0x3750 fs/btrfs/transaction.c:2196
 prepare_to_merge+0x86d/0x15a0 fs/btrfs/relocation.c:1777
 relocate_block_group+0xb01/0xd50 fs/btrfs/relocation.c:3675
 btrfs_relocate_block_group+0x77d/0xd90 fs/btrfs/relocation.c:4009
 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3511
 __btrfs_balance+0x1b57/0x26f0 fs/btrfs/volumes.c:4292
 btrfs_balance+0xbde/0x10c0 fs/btrfs/volumes.c:4669
 btrfs_ioctl_balance+0x3f5/0x660 fs/btrfs/ioctl.c:3587
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888040fe99a0
 which belongs to the cache btrfs_delayed_ref_node of size 112
The buggy address is located 40 bytes inside of
 freed 112-byte region [ffff888040fe99a0, ffff888040fe9a10)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x40fe9
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff888040c21500 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080170017 00000000f5000000 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 5315, tgid 5314 (syz.0.0), ts 59671390575, free_ts 59441230571
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x3695/0x37e0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740
 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2446 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2610
 new_slab mm/slub.c:2663 [inline]
 ___slab_alloc+0xc3b/0x1500 mm/slub.c:3849
 __slab_alloc+0x58/0xa0 mm/slub.c:3939
 __slab_alloc_node mm/slub.c:4014 [inline]
 slab_alloc_node mm/slub.c:4175 [inline]
 kmem_cache_alloc_noprof+0x270/0x390 mm/slub.c:4194
 add_delayed_ref+0x1a0/0x1e90 fs/btrfs/delayed-ref.c:1007
 btrfs_alloc_tree_block+0xeb6/0x15d0 fs/btrfs/extent-tree.c:5176
 btrfs_force_cow_block+0x530/0x2010 fs/btrfs/ctree.c:506
 btrfs_cow_block+0x377/0x840 fs/btrfs/ctree.c:688
 btrfs_search_slot+0xc12/0x31c0 fs/btrfs/ctree.c:2088
 btrfs_insert_empty_items fs/btrfs/ctree.c:4287 [inline]
 btrfs_insert_empty_item fs/btrfs/ctree.h:673 [inline]
 btrfs_insert_item+0x1a2/0x3c0 fs/btrfs/ctree.c:4316
 create_reloc_root+0x675/0xa80 fs/btrfs/relocation.c:647
 btrfs_init_reloc_root+0x275/0x4f0 fs/btrfs/relocation.c:723
page last free pid 5334 tgid 5334 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0xe16/0x10f0 mm/page_alloc.c:2660
 discard_slab mm/slub.c:2707 [inline]
 __put_partials+0x160/0x1c0 mm/slub.c:3176
 put_cpu_partial+0x17e/0x250 mm/slub.c:3251
 __slab_free+0x294/0x390 mm/slub.c:4503
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/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:250 [inline]
 slab_post_alloc_hook mm/slub.c:4138 [inline]
 slab_alloc_node mm/slub.c:4187 [inline]
 kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4194
 getname_flags+0xb6/0x530 fs/namei.c:146
 getname include/linux/fs.h:2844 [inline]
 getname_maybe_null include/linux/fs.h:2851 [inline]
 vfs_fstatat+0x43/0x150 fs/stat.c:363
 __do_sys_newfstatat fs/stat.c:532 [inline]
 __se_sys_newfstatat fs/stat.c:526 [inline]
 __x64_sys_newfstatat+0x11f/0x1a0 fs/stat.c:526
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888040fe9880: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00
 ffff888040fe9900: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff888040fe9980: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888040fe9a00: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888040fe9a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================