================================================================== BUG: KASAN: slab-use-after-free in add_ra_bio_pages.constprop.0.isra.0+0xf03/0xfb0 fs/btrfs/compression.c:529 Read of size 8 at addr ffff88805a317178 by task syz-executor.2/12977 CPU: 0 PID: 12977 Comm: syz-executor.2 Not tainted 6.10.0-rc4-syzkaller-00283-g563a50672d8a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 add_ra_bio_pages.constprop.0.isra.0+0xf03/0xfb0 fs/btrfs/compression.c:529 btrfs_submit_compressed_read+0x5fb/0x930 fs/btrfs/compression.c:617 submit_one_bio+0x15c/0x1c0 fs/btrfs/extent_io.c:118 btrfs_readahead+0x132b/0x15c0 fs/btrfs/extent_io.c:2318 read_pages+0x1a8/0xd80 mm/readahead.c:160 page_cache_ra_unbounded+0x2d8/0x5a0 mm/readahead.c:273 do_page_cache_ra mm/readahead.c:303 [inline] page_cache_ra_order+0x6e5/0xae0 mm/readahead.c:547 ondemand_readahead+0x520/0x1140 mm/readahead.c:669 page_cache_sync_ra+0x174/0x1d0 mm/readahead.c:696 page_cache_sync_readahead include/linux/pagemap.h:1306 [inline] filemap_get_pages+0xc01/0x1830 mm/filemap.c:2529 filemap_read+0x3af/0xd10 mm/filemap.c:2625 btrfs_file_read_iter+0x1dc/0x840 fs/btrfs/file.c:4025 copy_splice_read+0x615/0xb80 fs/splice.c:365 do_splice_read fs/splice.c:984 [inline] do_splice_read+0x2cf/0x380 fs/splice.c:959 splice_direct_to_actor+0x2a4/0xa40 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x17e/0x250 fs/splice.c:1233 do_sendfile+0xb1e/0xe50 fs/read_write.c:1295 __do_compat_sys_sendfile fs/read_write.c:1383 [inline] __se_compat_sys_sendfile fs/read_write.c:1366 [inline] __ia32_compat_sys_sendfile+0x1e7/0x230 fs/read_write.c:1366 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf72b9579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5e8a5ac EFLAGS: 00000292 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000004 RDX: 0000000000000000 RSI: 0000000000201005 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 12977: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3941 [inline] slab_alloc_node mm/slub.c:4001 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4008 alloc_extent_map+0x1c/0x100 fs/btrfs/extent_map.c:48 btrfs_get_extent+0x223/0x1aa0 fs/btrfs/inode.c:6826 btrfs_dio_iomap_begin+0x6e9/0x1e40 fs/btrfs/inode.c:7617 iomap_iter+0x61f/0x1080 fs/iomap/iter.c:91 __iomap_dio_rw+0x6ba/0x1c70 fs/iomap/direct-io.c:659 iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:749 btrfs_dio_read+0xb1/0xf0 fs/btrfs/inode.c:7881 btrfs_direct_read fs/btrfs/file.c:3980 [inline] btrfs_file_read_iter+0x5c4/0x840 fs/btrfs/file.c:4019 copy_splice_read+0x615/0xb80 fs/splice.c:365 do_splice_read fs/splice.c:984 [inline] do_splice_read+0x2cf/0x380 fs/splice.c:959 splice_direct_to_actor+0x2a4/0xa40 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x17e/0x250 fs/splice.c:1233 do_sendfile+0xb1e/0xe50 fs/read_write.c:1295 __do_compat_sys_sendfile fs/read_write.c:1383 [inline] __se_compat_sys_sendfile fs/read_write.c:1366 [inline] __ia32_compat_sys_sendfile+0x1e7/0x230 fs/read_write.c:1366 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 12977: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4437 [inline] kmem_cache_free+0x12f/0x3a0 mm/slub.c:4512 free_extent_map fs/btrfs/extent_map.c:68 [inline] free_extent_map+0xeb/0x140 fs/btrfs/extent_map.c:61 add_ra_bio_pages.constprop.0.isra.0+0x772/0xfb0 fs/btrfs/compression.c:517 btrfs_submit_compressed_read+0x5fb/0x930 fs/btrfs/compression.c:617 submit_one_bio+0x15c/0x1c0 fs/btrfs/extent_io.c:118 btrfs_readahead+0x132b/0x15c0 fs/btrfs/extent_io.c:2318 read_pages+0x1a8/0xd80 mm/readahead.c:160 page_cache_ra_unbounded+0x2d8/0x5a0 mm/readahead.c:273 do_page_cache_ra mm/readahead.c:303 [inline] page_cache_ra_order+0x6e5/0xae0 mm/readahead.c:547 ondemand_readahead+0x520/0x1140 mm/readahead.c:669 page_cache_sync_ra+0x174/0x1d0 mm/readahead.c:696 page_cache_sync_readahead include/linux/pagemap.h:1306 [inline] filemap_get_pages+0xc01/0x1830 mm/filemap.c:2529 filemap_read+0x3af/0xd10 mm/filemap.c:2625 btrfs_file_read_iter+0x1dc/0x840 fs/btrfs/file.c:4025 copy_splice_read+0x615/0xb80 fs/splice.c:365 do_splice_read fs/splice.c:984 [inline] do_splice_read+0x2cf/0x380 fs/splice.c:959 splice_direct_to_actor+0x2a4/0xa40 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x17e/0x250 fs/splice.c:1233 do_sendfile+0xb1e/0xe50 fs/read_write.c:1295 __do_compat_sys_sendfile fs/read_write.c:1383 [inline] __se_compat_sys_sendfile fs/read_write.c:1366 [inline] __ia32_compat_sys_sendfile+0x1e7/0x230 fs/read_write.c:1366 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff88805a317160 which belongs to the cache btrfs_extent_map of size 112 The buggy address is located 24 bytes inside of freed 112-byte region [ffff88805a317160, ffff88805a3171d0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a317 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 04fff00000000000 ffff888025885900 ffffea0001570100 0000000000000006 raw: 0000000000000000 0000000080170017 00000001ffffefff 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 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 40, tgid 40 (kworker/u32:2), ts 494044152115, free_ts 493554824903 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x56/0x110 mm/slub.c:2265 allocate_slab mm/slub.c:2428 [inline] new_slab+0x84/0x260 mm/slub.c:2481 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3989 [inline] kmem_cache_alloc_noprof+0x2ae/0x2f0 mm/slub.c:4008 alloc_extent_map fs/btrfs/extent_map.c:48 [inline] btrfs_drop_extent_map_range+0xb7/0x13d0 fs/btrfs/extent_map.c:719 btrfs_replace_extent_map_range+0xfb/0x1b0 fs/btrfs/extent_map.c:932 create_io_em+0x22c/0x760 fs/btrfs/inode.c:7361 cow_file_range+0x530/0xeb0 fs/btrfs/inode.c:1438 run_delalloc_cow+0xa7/0x150 fs/btrfs/inode.c:1751 submit_uncompressed_range.isra.0+0x124/0x350 fs/btrfs/inode.c:1128 submit_one_async_extent fs/btrfs/inode.c:1179 [inline] submit_compressed_extents+0x732/0x13a0 fs/btrfs/inode.c:1641 run_ordered_work fs/btrfs/async-thread.c:245 [inline] btrfs_work_helper+0x2d2/0xc90 fs/btrfs/async-thread.c:324 page last free pid 12763 tgid 12762 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583 __folio_put+0x239/0x360 mm/swap.c:129 folio_put include/linux/mm.h:1508 [inline] put_page include/linux/mm.h:1580 [inline] skb_page_unref include/linux/skbuff_ref.h:44 [inline] __skb_frag_unref include/linux/skbuff_ref.h:57 [inline] skb_release_data+0x5df/0x980 net/core/skbuff.c:1102 skb_release_all net/core/skbuff.c:1173 [inline] __kfree_skb+0x4f/0x70 net/core/skbuff.c:1187 tcp_wmem_free_skb include/net/tcp.h:306 [inline] tcp_write_queue_purge+0x188/0xd60 net/ipv4/tcp.c:3000 tcp_v4_destroy_sock+0xfa/0x590 net/ipv4/tcp_ipv4.c:2524 inet_csk_destroy_sock+0x1a3/0x450 net/ipv4/inet_connection_sock.c:1225 __tcp_close+0xbfc/0xfe0 net/ipv4/tcp.c:2947 tcp_close+0x28/0x130 net/ipv4/tcp.c:2959 inet_release+0x13c/0x280 net/ipv4/af_inet.c:437 __sock_release+0xb0/0x270 net/socket.c:659 sock_close+0x1c/0x30 net/socket.c:1421 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:180 get_signal+0x1d3/0x2670 kernel/signal.c:2681 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 Memory state around the buggy address: ffff88805a317000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff88805a317080: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb >ffff88805a317100: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb ^ ffff88805a317180: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ffff88805a317200: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi