bcachefs (loop4): mounting version 1.7: mi_btree_bitmap opts=compression=lz4,background_compression=zstd,nojournal_transaction_names,nocow
bcachefs (loop4): recovering from clean shutdown, journal seq 15
==================================================================
BUG: KASAN: use-after-free in memcpy_dir crypto/scatterwalk.c:23 [inline]
BUG: KASAN: use-after-free in scatterwalk_copychunks+0x1cc/0x460 crypto/scatterwalk.c:38
Read of size 32 at addr ffff88805bd00000 by task syz.4.29/5307

CPU: 1 PID: 5307 Comm: syz.4.29 Not tainted 6.10.0-rc7-syzkaller-00266-g4d145e3f830b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 memcpy_dir crypto/scatterwalk.c:23 [inline]
 scatterwalk_copychunks+0x1cc/0x460 crypto/scatterwalk.c:38
 skcipher_next_slow+0x39d/0x480 crypto/skcipher.c:276
 skcipher_walk_next+0x634/0xba0 crypto/skcipher.c:361
 chacha_simd_stream_xor+0x67f/0xd10 arch/x86/crypto/chacha_glue.c:192
 do_encrypt_sg fs/bcachefs/checksum.c:108 [inline]
 do_encrypt+0x4ef/0x7d0 fs/bcachefs/checksum.c:128
 bset_encrypt fs/bcachefs/btree_io.h:118 [inline]
 bch2_btree_node_read_done+0x1ed6/0x6750 fs/bcachefs/btree_io.c:1088
 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1345
 bch2_btree_node_read+0x2433/0x2a10
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline]
 bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1793
 read_btree_roots+0x22d/0x7c0 fs/bcachefs/recovery.c:481
 bch2_fs_recovery+0x235c/0x3730 fs/bcachefs/recovery.c:809
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1038
 bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2135
 bch2_mount+0x6b0/0x13c0 fs/bcachefs/fs.c:1932
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1789
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 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: 0033:0x7f76373772da
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 7e 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f7638214e78 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7638214f00 RCX: 00007f76373772da
RDX: 000000002000fec0 RSI: 0000000020000000 RDI: 00007f7638214ec0
RBP: 000000002000fec0 R08: 00007f7638214f00 R09: 0000000001800800
R10: 0000000001800800 R11: 0000000000000206 R12: 0000000020000000
R13: 00007f7638214ec0 R14: 000000000000fe88 R15: 00000000200001c0
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5bd00
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 00fff00000000000 ffff88813fffaac8 ffff88813fffaac8 0000000000000000
raw: 0000000000000000 0000000000000005 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 5, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5307, tgid 5306 (syz.4.29), ts 74312759401, free_ts 74516088528
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473
 prep_new_page mm/page_alloc.c:1481 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 __kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4068
 __do_kmalloc_node mm/slub.c:4111 [inline]
 __kmalloc_node_noprof+0x2d2/0x440 mm/slub.c:4130
 kmalloc_node_noprof include/linux/slab.h:681 [inline]
 kvmalloc_node_noprof+0x72/0x190 mm/util.c:634
 btree_node_data_alloc+0xd3/0x260 fs/bcachefs/btree_cache.c:105
 __bch2_btree_node_mem_alloc+0x1e1/0x3b0 fs/bcachefs/btree_cache.c:150
 bch2_fs_btree_cache_init+0x269/0x570 fs/bcachefs/btree_cache.c:550
 bch2_fs_alloc+0x1c28/0x20a0 fs/bcachefs/super.c:918
 bch2_fs_open+0x8cc/0xdf0 fs/bcachefs/super.c:2114
 bch2_mount+0x6b0/0x13c0 fs/bcachefs/fs.c:1932
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1789
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
page last free pid 5307 tgid 5306 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1093 [inline]
 __free_pages_ok+0xb46/0xcb0 mm/page_alloc.c:1213
 __folio_put+0x3b9/0x620 mm/swap.c:129
 folio_put include/linux/mm.h:1513 [inline]
 free_large_kmalloc+0x105/0x1c0 mm/slub.c:4530
 kfree+0x1c4/0x360 mm/slub.c:4553
 btree_bounce_free fs/bcachefs/btree_io.c:118 [inline]
 bch2_btree_node_read_done+0x3e8f/0x6750 fs/bcachefs/btree_io.c:1220
 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1345
 bch2_btree_node_read+0x2433/0x2a10
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline]
 bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1793
 read_btree_roots+0x22d/0x7c0 fs/bcachefs/recovery.c:481
 bch2_fs_recovery+0x235c/0x3730 fs/bcachefs/recovery.c:809
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1038
 bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2135
 bch2_mount+0x6b0/0x13c0 fs/bcachefs/fs.c:1932
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1789
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352

Memory state around the buggy address:
 ffff88805bcfff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805bcfff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88805bd00000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88805bd00080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805bd00100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================