syzbot

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 (5320)
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)
BTRFS info (device loop0): balance: start -d -m
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
BTRFS info (device loop0): relocating block group 5242880 flags data|metadata
==================================================================
BUG: KASAN: slab-use-after-free in do_perf_trace_btrfs_delayed_data_ref include/trace/events/btrfs.h:913 [inline]
BUG: KASAN: slab-use-after-free in perf_trace_btrfs_delayed_data_ref+0x309/0x670 include/trace/events/btrfs.h:913
Read of size 8 at addr ffff888040bb8708 by task syz.0.0/5320

CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
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_data_ref include/trace/events/btrfs.h:913 [inline]
 perf_trace_btrfs_delayed_data_ref+0x309/0x670 include/trace/events/btrfs.h:913
 __do_trace_add_delayed_data_ref include/trace/events/btrfs.h:958 [inline]
 trace_add_delayed_data_ref include/trace/events/btrfs.h:958 [inline]
 add_delayed_ref+0x1c7b/0x1e90 fs/btrfs/delayed-ref.c:1069
 btrfs_free_extent+0x292/0x320 fs/btrfs/extent-tree.c:3517
 __btrfs_mod_ref+0x7dd/0xac0 fs/btrfs/extent-tree.c:2521
 update_ref_for_cow+0x9cd/0x11f0 fs/btrfs/ctree.c:445
 btrfs_force_cow_block+0x9fe/0x1fd0 fs/btrfs/ctree.c:527
 btrfs_cow_block+0x371/0x830 fs/btrfs/ctree.c:688
 do_relocation+0xec8/0x19b0 fs/btrfs/relocation.c:2275
 relocate_tree_block fs/btrfs/relocation.c:2528 [inline]
 relocate_tree_blocks+0x1258/0x20c0 fs/btrfs/relocation.c:2635
 relocate_block_group+0x755/0xd40 fs/btrfs/relocation.c:3609
 btrfs_relocate_block_group+0x77d/0xd90 fs/btrfs/relocation.c:4009
 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3511
 __btrfs_balance+0x1b0f/0x26b0 fs/btrfs/volumes.c:4292
 btrfs_balance+0xbdc/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+0xf5/0x170 fs/ioctl.c:892
 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: 0033:0x7f294798d169
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:00007f2948782038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2947ba5fa0 RCX: 00007f294798d169
RDX: 0000400000000180 RSI: 00000000c4009420 RDI: 0000000000000008
RBP: 00007f2947a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2947ba5fa0 R15: 00007fffb2830ba8
 </TASK>

Allocated by task 5320:
 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:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4171
 add_delayed_ref+0x19e/0x1e90 fs/btrfs/delayed-ref.c:1007
 btrfs_free_extent+0x292/0x320 fs/btrfs/extent-tree.c:3517
 __btrfs_mod_ref+0x7dd/0xac0 fs/btrfs/extent-tree.c:2521
 update_ref_for_cow+0x9cd/0x11f0 fs/btrfs/ctree.c:445
 btrfs_force_cow_block+0x9fe/0x1fd0 fs/btrfs/ctree.c:527
 btrfs_cow_block+0x371/0x830 fs/btrfs/ctree.c:688
 do_relocation+0xec8/0x19b0 fs/btrfs/relocation.c:2275
 relocate_tree_block fs/btrfs/relocation.c:2528 [inline]
 relocate_tree_blocks+0x1258/0x20c0 fs/btrfs/relocation.c:2635
 relocate_block_group+0x755/0xd40 fs/btrfs/relocation.c:3609
 btrfs_relocate_block_group+0x77d/0xd90 fs/btrfs/relocation.c:4009
 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3511
 __btrfs_balance+0x1b0f/0x26b0 fs/btrfs/volumes.c:4292
 btrfs_balance+0xbdc/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+0xf5/0x170 fs/ioctl.c:892
 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 1143:
 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:2353 [inline]
 slab_free mm/slub.c:4609 [inline]
 kmem_cache_free+0x195/0x410 mm/slub.c:4711
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1988 [inline]
 __btrfs_run_delayed_refs+0x1bb3/0x40f0 fs/btrfs/extent-tree.c:2046
 btrfs_run_delayed_refs+0xe3/0x2f0 fs/btrfs/extent-tree.c:2158
 flush_space+0x274/0xd30
 btrfs_async_reclaim_metadata_space+0x178/0x3b0 fs/btrfs/space-info.c:1120
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff888040bb86e0
 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 [ffff888040bb86e0, ffff888040bb8750)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x40bb8
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff888040b70640 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 5320, tgid 5319 (syz.0.0), ts 80075627064, free_ts 80074979921
 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+0x365c/0x37a0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4740
 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
 __slab_alloc+0x58/0xa0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4171
 add_delayed_ref+0x19e/0x1e90 fs/btrfs/delayed-ref.c:1007
 btrfs_free_extent+0x292/0x320 fs/btrfs/extent-tree.c:3517
 __btrfs_mod_ref+0x7dd/0xac0 fs/btrfs/extent-tree.c:2521
 update_ref_for_cow+0x9cd/0x11f0 fs/btrfs/ctree.c:445
 btrfs_force_cow_block+0x9fe/0x1fd0 fs/btrfs/ctree.c:527
 btrfs_cow_block+0x371/0x830 fs/btrfs/ctree.c:688
 do_relocation+0xec8/0x19b0 fs/btrfs/relocation.c:2275
 relocate_tree_block fs/btrfs/relocation.c:2528 [inline]
 relocate_tree_blocks+0x1258/0x20c0 fs/btrfs/relocation.c:2635
page last free pid 5320 tgid 5319 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660
 rcu_do_batch kernel/rcu/tree.c:2546 [inline]
 rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802
 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702

Memory state around the buggy address:
 ffff888040bb8600: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
 ffff888040bb8680: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
>ffff888040bb8700: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
                      ^
 ffff888040bb8780: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888040bb8800: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================