Hello, syzbot found the following issue on: HEAD commit: d3d1556696c1 Merge tag 'mm-hotfixes-stable-2024-10-09-15-4.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1651a040580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd dashboard link: https://syzkaller.appspot.com/bug?extid=a1595e656a83ea5b78eb compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-d3d15566.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5087f167d7b8/vmlinux-d3d15566.xz kernel image: https://storage.googleapis.com/syzbot-assets/a9f5c056e452/bzImage-d3d15566.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a1595e656a83ea5b78eb@xxxxxxxxxxxxxxxxxxxxxxxxx Bluetooth: hci2: Controller not accepting commands anymore: ncmd = 0 Bluetooth: hci2: Injecting HCI hardware error event Bluetooth: hci2: hardware error 0x00 ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1a6/0x1c0 lib/list_debug.c:62 Read of size 8 at addr ffff888048dd4550 by task kworker/u33:6/5358 CPU: 1 UID: 0 PID: 5358 Comm: kworker/u33:6 Not tainted 6.12.0-rc2-syzkaller-00074-gd3d1556696c1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci2 hci_error_reset Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 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 __list_del_entry_valid_or_report+0x1a6/0x1c0 lib/list_debug.c:62 __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] bt_accept_unlink+0x34/0x2e0 net/bluetooth/af_bluetooth.c:234 l2cap_sock_teardown_cb+0x1a3/0x3c0 net/bluetooth/l2cap_sock.c:1599 l2cap_chan_del+0xba/0x900 net/bluetooth/l2cap_core.c:658 l2cap_conn_del+0x37c/0x730 net/bluetooth/l2cap_core.c:1785 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:7299 [inline] l2cap_disconn_cfm+0x96/0xd0 net/bluetooth/l2cap_core.c:7292 hci_disconn_cfm include/net/bluetooth/hci_core.h:1975 [inline] hci_conn_hash_flush+0x114/0x260 net/bluetooth/hci_conn.c:2589 hci_dev_close_sync+0x59e/0x1110 net/bluetooth/hci_sync.c:5195 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:483 hci_error_reset+0xbf/0x320 net/bluetooth/hci_core.c:1016 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Allocated by task 6177: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1e8/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2164 sk_alloc+0x36/0xb90 net/core/sock.c:2217 __netlink_create+0x5e/0x2c0 net/netlink/af_netlink.c:646 netlink_create+0x3a4/0x630 net/netlink/af_netlink.c:704 __sock_create+0x32e/0x800 net/socket.c:1576 sock_create net/socket.c:1627 [inline] __sys_socket_create net/socket.c:1664 [inline] __sys_socket+0x14f/0x260 net/socket.c:1711 __do_sys_socket net/socket.c:1725 [inline] __se_sys_socket net/socket.c:1723 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1723 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6182: 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 mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x14f/0x4b0 mm/slub.c:4727 sk_prot_free net/core/sock.c:2200 [inline] __sk_destruct+0x5eb/0x720 net/core/sock.c:2292 sk_destruct+0xc2/0xf0 net/core/sock.c:2307 __sk_free+0xf4/0x3e0 net/core/sock.c:2318 sk_free+0x6a/0x90 net/core/sock.c:2329 deferred_put_nlk_sk+0x13f/0x2d0 net/netlink/af_netlink.c:740 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2823 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 __call_rcu_common.constprop.0+0x99/0x7a0 kernel/rcu/tree.c:3086 netlink_release+0x1206/0x1ff0 net/netlink/af_netlink.c:823 __sock_release+0xb0/0x270 net/socket.c:658 sock_close+0x1c/0x30 net/socket.c:1426 __fput+0x3f6/0xb60 fs/file_table.c:431 __fput_sync+0x45/0x50 fs/file_table.c:516 __do_sys_close fs/open.c:1565 [inline] __se_sys_close fs/open.c:1550 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1550 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888048dd4000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1360 bytes inside of freed 2048-byte region [ffff888048dd4000, ffff888048dd4800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888048dd2000 pfn:0x48dd0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b042f00 ffffea00009c5e10 ffffea00012b8410 raw: ffff888048dd2000 0000000000080007 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801b042f00 ffffea00009c5e10 ffffea00012b8410 head: ffff888048dd2000 0000000000080007 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0001237401 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5352, tgid 5352 (syz-executor), ts 38680626357, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x101e/0x3070 mm/page_alloc.c:3457 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2ba/0x3f0 mm/slub.c:2631 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:878 [inline] rtnl_newlink+0x49/0xa0 net/core/rtnetlink.c:3739 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6646 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] __sys_sendto+0x479/0x4d0 net/socket.c:2209 __do_sys_sendto net/socket.c:2221 [inline] __se_sys_sendto net/socket.c:2217 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2217 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 page_owner free stack trace missing Memory state around the buggy address: ffff888048dd4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888048dd4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888048dd4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888048dd4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888048dd4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
