bcachefs (loop2): mounting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,journal_reclaim_delay=112918628,nojournal_transaction_names
bcachefs (loop2): recovering from clean shutdown, journal seq 10
==================================================================
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 40 at addr ffff88804ebc0000 by task syz-executor.2/19353

CPU: 1 PID: 19353 Comm: syz-executor.2 Not tainted 6.9.0-rc7-next-20240510-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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+0x184f/0x6770 fs/bcachefs/btree_io.c:1124
 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1340
 bch2_btree_node_read+0x2467/0x2a40
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1764 [inline]
 bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1788
 read_btree_roots+0x22d/0x7b0 fs/bcachefs/recovery.c:472
 bch2_fs_recovery+0x2346/0x3700 fs/bcachefs/recovery.c:800
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1031
 bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2123
 bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1917
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1780
 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+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fafe767f46a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fafe835eef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fafe835ef80 RCX: 00007fafe767f46a
RDX: 0000000020011a00 RSI: 00000000200005c0 RDI: 00007fafe835ef40
RBP: 0000000020011a00 R08: 00007fafe835ef80 R09: 0000000001a00014
R10: 0000000001a00014 R11: 0000000000000202 R12: 00000000200005c0
R13: 00007fafe835ef40 R14: 0000000000011a02 R15: 0000000020000600
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88804ebc6000 pfn:0x4ebc0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 00fff00000000000 ffffea0001a2fc08 ffffea000142cc08 0000000000000000
raw: ffff88804ebc6000 0000000000000004 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 18934, tgid 18933 (syz-executor.4), ts 843715400135, free_ts 846695174117
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468
 prep_new_page mm/page_alloc.c:1476 [inline]
 get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 vm_area_alloc_pages mm/vmalloc.c:3567 [inline]
 __vmalloc_area_node mm/vmalloc.c:3643 [inline]
 __vmalloc_node_range_noprof+0x9a4/0x1490 mm/vmalloc.c:3824
 vmalloc_user_noprof+0x74/0x80 mm/vmalloc.c:3978
 vb2_vmalloc_alloc+0xf2/0x340 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47
 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:243 [inline]
 __vb2_queue_alloc+0xa0f/0x16f0 drivers/media/common/videobuf2/videobuf2-core.c:510
 vb2_core_reqbufs+0xd2e/0x17c0 drivers/media/common/videobuf2/videobuf2-core.c:951
 v4l2_m2m_reqbufs drivers/media/v4l2-core/v4l2-mem2mem.c:582 [inline]
 v4l2_m2m_ioctl_reqbufs+0x14e/0x230 drivers/media/v4l2-core/v4l2-mem2mem.c:1376
 __video_do_ioctl+0xc26/0xde0 drivers/media/v4l2-core/v4l2-ioctl.c:3105
 video_usercopy+0x89b/0x1180 drivers/media/v4l2-core/v4l2-ioctl.c:3446
 v4l2_ioctl+0x18c/0x1e0 drivers/media/v4l2-core/v4l2-dev.c:364
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 18944 tgid 18933 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1088 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2601
 vfree+0x186/0x2e0 mm/vmalloc.c:3346
 vb2_vmalloc_put+0x68/0xb0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:68
 __vb2_buf_mem_free+0xfa/0x2a0 drivers/media/common/videobuf2/videobuf2-core.c:276
 __vb2_free_mem drivers/media/common/videobuf2/videobuf2-core.c:558 [inline]
 __vb2_queue_free+0x450/0xed0 drivers/media/common/videobuf2/videobuf2-core.c:586
 vb2_core_queue_release+0x6c/0x150 drivers/media/common/videobuf2/videobuf2-core.c:2655
 v4l2_m2m_ctx_release+0x1e/0x40 drivers/media/v4l2-core/v4l2-mem2mem.c:1276
 vicodec_release+0x97/0x110 drivers/media/test-drivers/vicodec/vicodec-core.c:1941
 v4l2_release+0x1f8/0x3b0 drivers/media/v4l2-core/v4l2-dev.c:456
 __fput+0x406/0x8b0 fs/file_table.c:422
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa27/0x27e0 kernel/exit.c:874
 do_group_exit+0x207/0x2c0 kernel/exit.c:1023
 get_signal+0x16a1/0x1740 kernel/signal.c:2909
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218

Memory state around the buggy address:
 ffff88804ebbff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804ebbff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804ebc0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88804ebc0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804ebc0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================