bcachefs (loop0): Detected missing backpointers in bucket 34, now have 1/128 with missing
running recovery pass check_extents_to_backpointers (17), currently at delete_dead_snapshots (26)
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: slab-use-after-free in bch2_bucket_bitmap_test fs/bcachefs/backpointers.h:194 [inline]
BUG: KASAN: slab-use-after-free in bch2_bucket_is_movable fs/bcachefs/movinggc.c:78 [inline]
BUG: KASAN: slab-use-after-free in bch2_copygc_get_buckets fs/bcachefs/movinggc.c:157 [inline]
BUG: KASAN: slab-use-after-free in bch2_copygc+0x105d/0x4510 fs/bcachefs/movinggc.c:221
Read of size 8 at addr ffff8880426a4dc0 by task bch-copygc/loop/5375
CPU: 0 UID: 0 PID: 5375 Comm: bch-copygc/loop Not tainted syzkaller #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_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
bch2_bucket_bitmap_test fs/bcachefs/backpointers.h:194 [inline]
bch2_bucket_is_movable fs/bcachefs/movinggc.c:78 [inline]
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:157 [inline]
bch2_copygc+0x105d/0x4510 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x97a/0xe00 fs/bcachefs/movinggc.c:409
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 5375:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4376 [inline]
__kvmalloc_node_noprof+0x30d/0x5f0 mm/slub.c:5067
kvmalloc_array_node_noprof include/linux/slab.h:1065 [inline]
bch2_bucket_bitmap_set+0x9a/0x1d0 fs/bcachefs/backpointers.c:1351
check_bucket_backpointer_mismatch+0x1bdf/0x23a0 fs/bcachefs/backpointers.c:964
check_bucket_backpointer_pos_mismatch fs/bcachefs/backpointers.c:1193 [inline]
bch2_check_bucket_backpointer_mismatch+0x36c/0x690 fs/bcachefs/backpointers.c:1205
__bch2_move_data_phys+0x17a7/0x1c50 fs/bcachefs/move.c:922
bch2_evacuate_bucket+0x228/0x3a0 fs/bcachefs/move.c:1082
bch2_copygc+0x3be3/0x4510 fs/bcachefs/movinggc.c:234
bch2_copygc_thread+0x97a/0xe00 fs/bcachefs/movinggc.c:409
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff8880426a4dc0
which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes inside of
freed 16-byte region [ffff8880426a4dc0, ffff8880426a4dd0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x426a4
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff88801a441640 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080800080 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5364, tgid 5363 (syz.0.0), ts 86357103551, free_ts 86322734116
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2492 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2660
new_slab mm/slub.c:2714 [inline]
___slab_alloc+0xbeb/0x1420 mm/slub.c:3901
__slab_alloc mm/slub.c:3992 [inline]
__slab_alloc_node mm/slub.c:4067 [inline]
slab_alloc_node mm/slub.c:4228 [inline]
__do_kmalloc_node mm/slub.c:4375 [inline]
__kmalloc_noprof+0x305/0x4f0 mm/slub.c:4388
kmalloc_noprof include/linux/slab.h:909 [inline]
kmalloc_array_noprof include/linux/slab.h:948 [inline]
__bch2_sb_replicas_v0_to_cpu_replicas+0x131/0xad0 fs/bcachefs/replicas.c:563
bch2_sb_replicas_v0_validate+0x48/0xb0 fs/bcachefs/replicas.c:774
bch2_sb_field_validate+0x140/0x280 fs/bcachefs/super-io.c:1375
bch2_sb_validate+0x1569/0x1980 fs/bcachefs/super-io.c:560
bch2_write_super+0xd68/0x2d30 fs/bcachefs/super-io.c:1089
bch2_sb_recovery_pass_complete fs/bcachefs/recovery_passes.c:154 [inline]
bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:496 [inline]
__bch2_run_recovery_passes+0x64f/0x1060 fs/bcachefs/recovery_passes.c:539
bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:610
bch2_fs_recovery+0x2690/0x3a50 fs/bcachefs/recovery.c:1016
bch2_fs_start+0xaaf/0xda0 fs/bcachefs/super.c:1213
page last free pid 5364 tgid 5363 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffff8880426a4c80: 00 00 fc fc 00 00 fc fc fa fb fc fc fa fb fc fc
ffff8880426a4d00: fa fb fc fc fa fb fc fc 00 00 fc fc 00 00 fc fc
>ffff8880426a4d80: 00 00 fc fc 00 00 fc fc fb fb fc fc 00 00 fc fc
^
ffff8880426a4e00: 00 00 fc fc fa fb fc fc fa fb fc fc 00 00 fc fc
ffff8880426a4e80: fa fb fc fc fa fb fc fc 00 00 fc fc 00 00 fc fc
==================================================================