================================================================== BUG: KASAN: stack-out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:214 [inline] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0xb87/0x2090 arch/x86/kernel/unwind_orc.c:498 Read of size 2 at addr ffffc90006817b40 by task iou-wrk-18470/18471 CPU: 3 UID: 0 PID: 18471 Comm: iou-wrk-18470 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 user_mode arch/x86/include/asm/ptrace.h:214 [inline] unwind_next_frame+0xb87/0x2090 arch/x86/kernel/unwind_orc.c:498 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save_tsk+0x16d/0x210 kernel/stacktrace.c:150 proc_pid_stack+0x16e/0x2b0 fs/proc/base.c:490 proc_single_show+0x124/0x1f0 fs/proc/base.c:793 seq_read_iter+0x32f/0x1270 fs/seq_file.c:231 seq_read+0x344/0x4d0 fs/seq_file.c:163 loop_rw_iter+0x305/0x6a0 io_uring/rw.c:730 io_iter_do_read io_uring/rw.c:837 [inline] io_iter_do_read io_uring/rw.c:830 [inline] __io_read+0x1084/0x1470 io_uring/rw.c:953 io_read+0x8d/0x230 io_uring/rw.c:1032 __io_issue_sqe+0xe8/0x7a0 io_uring/io_uring.c:1386 io_issue_sqe+0x88/0x1540 io_uring/io_uring.c:1409 io_wq_submit_work+0x3b6/0xf70 io_uring/io_uring.c:1525 io_worker_handle_work+0x60a/0x15e0 io_uring/io-wq.c:659 io_wq_worker+0x33e/0xe60 io_uring/io-wq.c:714 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to a 8-page vmalloc region starting at 0xffffc90006810000 allocated at kernel_clone+0x176/0x9d0 kernel/fork.c:2771 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x70f3f memcg:ffff888029966282 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 0000000000000000 00000000ffffffff 0000000000000000 raw: ffffffffffffffff 0000000000000000 00000001ffffffff ffff888029966282 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x29c2(GFP_NOWAIT|__GFP_HIGHMEM|__GFP_IO|__GFP_FS|__GFP_ZERO), pid 13699, tgid 13699 (syz-executor), ts 750294440238 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_pages_mpol+0x201/0x550 mm/mempolicy.c:2486 alloc_pages_noprof+0x1a/0x160 mm/mempolicy.c:2577 vm_area_alloc_pages mm/vmalloc.c:3689 [inline] __vmalloc_area_node mm/vmalloc.c:3914 [inline] __vmalloc_node_range_noprof+0x833/0x1420 mm/vmalloc.c:4104 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4165 alloc_thread_stack_node kernel/fork.c:359 [inline] dup_task_struct kernel/fork.c:930 [inline] copy_process+0x803/0x8380 kernel/fork.c:2134 kernel_clone+0x176/0x9d0 kernel/fork.c:2771 __do_compat_sys_ia32_clone+0xd4/0x120 arch/x86/kernel/sys_ia32.c:255 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316 entry_SYSENTER_compat_after_hwframe+0x84/0x8e page last free pid 5721 tgid 5721 ts 750290827256 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962 __folio_put+0x3b4/0x5f0 mm/folio.c:106 folio_put include/linux/mm.h:2160 [inline] put_page include/linux/mm.h:2229 [inline] put_netmem include/net/netmem.h:394 [inline] skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x5dd/0x860 net/core/skbuff.c:1116 skb_release_all net/core/skbuff.c:1197 [inline] __kfree_skb+0x4f/0x70 net/core/skbuff.c:1211 tcp_wmem_free_skb include/net/tcp.h:334 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:2325 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3698 [inline] tcp_ack+0x2079/0x7650 net/ipv4/tcp_input.c:4400 tcp_rcv_established+0x11bd/0x39f0 net/ipv4/tcp_input.c:6590 tcp_v4_do_rcv+0xbb6/0x1260 net/ipv4/tcp_ipv4.c:1854 sk_backlog_rcv include/net/sock.h:1190 [inline] __release_sock+0x35a/0x440 net/core/sock.c:3270 release_sock+0x1e5/0x280 net/core/sock.c:3869 tcp_sendmsg+0x38/0x50 net/ipv4/tcp.c:1452 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:865 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:815 [inline] sock_write_iter+0x4ea/0x5b0 net/socket.c:1266 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x1f8/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffffc90006817a00: f1 f1 f1 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 ffffc90006817a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90006817b00: 00 f1 f1 f1 f1 04 f3 f3 f3 00 00 00 00 00 00 00 ^ ffffc90006817b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90006817c00: f1 f1 f1 f1 00 f3 f3 f3 00 00 00 00 00 00 00 00 ==================================================================