================================================================== BUG: KASAN: use-after-free in __io_uring_show_fdinfo io_uring/fdinfo.c:98 [inline] BUG: KASAN: use-after-free in io_uring_show_fdinfo+0x625/0x1947 io_uring/fdinfo.c:206 Read of size 8 at addr ffff888070efff20 by task syz-executor137/3614 CPU: 1 PID: 3614 Comm: syz-executor137 Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 __io_uring_show_fdinfo io_uring/fdinfo.c:98 [inline] io_uring_show_fdinfo+0x625/0x1947 io_uring/fdinfo.c:206 seq_show+0x587/0x800 fs/proc/fd.c:68 seq_read_iter+0x4f5/0x1280 fs/seq_file.c:230 seq_read+0x16d/0x210 fs/seq_file.c:162 vfs_read+0x257/0x930 fs/read_write.c:468 ksys_pread64 fs/read_write.c:665 [inline] __do_sys_pread64 fs/read_write.c:675 [inline] __se_sys_pread64 fs/read_write.c:672 [inline] __x64_sys_pread64+0x1f7/0x250 fs/read_write.c:672 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5d9eb604e9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff67d324d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5d9eb604e9 RDX: 0000000000000011 RSI: 0000000020002140 RDI: 0000000000000005 RBP: 00007fff67d324e0 R08: 00007fff67d32370 R09: 68742f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5d9eb243d0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the physical page: page:ffffea0001c3bfc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x70eff flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 10956630395, free_ts 11652600851 split_map_pages+0x1ef/0x520 mm/compaction.c:99 isolate_freepages_range+0x30f/0x350 mm/compaction.c:737 alloc_contig_range+0x2f6/0x490 mm/page_alloc.c:9331 __alloc_contig_pages mm/page_alloc.c:9354 [inline] alloc_contig_pages+0x35a/0x4c0 mm/page_alloc.c:9431 debug_vm_pgtable_alloc_huge_page mm/debug_vm_pgtable.c:1098 [inline] init_args mm/debug_vm_pgtable.c:1221 [inline] debug_vm_pgtable+0x88f/0x29d6 mm/debug_vm_pgtable.c:1259 do_one_initcall+0xfe/0x650 init/main.c:1296 do_initcall_level init/main.c:1369 [inline] do_initcalls init/main.c:1385 [inline] do_basic_setup init/main.c:1404 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1623 kernel_init+0x1a/0x1d0 init/main.c:1512 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 free_contig_range+0xb1/0x180 mm/page_alloc.c:9453 destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x2945/0x29d6 mm/debug_vm_pgtable.c:1354 do_one_initcall+0xfe/0x650 init/main.c:1296 do_initcall_level init/main.c:1369 [inline] do_initcalls init/main.c:1385 [inline] do_basic_setup init/main.c:1404 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1623 kernel_init+0x1a/0x1d0 init/main.c:1512 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff888070effe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888070effe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888070efff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888070efff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888070f00000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================