Re: INFO: task hung in bpf_struct_ops_map_free

[Amery Hung]

On Tue, Feb 3, 2026 at 12:16 AM 梅开彦 <kai...@hust.edu.cn> wrote:
>
> Our fuzzer discovered a task hung vulnerability in the BPF subsystem. The crash can be trigger on bpf-next(39e9d5f63075f4d54e3b59b8238478c32af92755). We have not yet been able to develop a stable PoC to reproduce this vulnerability, but we will continue to analyze it further and testing whether it can be triggered on the latest bpf-next branch.
>
> Reported-by: Kaiyan Mei <M2024...@hust.edu.cn>
> Reported-by: Yinhao Hu <ddd...@hust.edu.cn>
> Reviewed-by: Dongliang Mu <dz...@hust.edu.cn>
>
> # Crash Report
> ```
> INFO: task syz.7.21680:81571 blocked for more than 143 seconds.
> Not tainted 6.17.0-g39e9d5f63075 #1
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz.7.21680 state:D stack:26984 pid:81571 tgid:81569 ppid:71075 task_flags:0x400140 flags:0x00080002
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5325 [inline]
> __schedule+0x1044/0x5bb0 kernel/sched/core.c:6929
> __schedule_loop kernel/sched/core.c:7011 [inline]
> schedule+0xe7/0x3a0 kernel/sched/core.c:7026
> schedule_timeout+0x245/0x280 kernel/time/sleep_timeout.c:75
> do_wait_for_common kernel/sched/completion.c:100 [inline]
> __wait_for_common+0x1d3/0x4e0 kernel/sched/completion.c:121
> wait_for_common kernel/sched/completion.c:132 [inline]
> wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:269
> __wait_rcu_gp+0x262/0x3a0 kernel/rcu/update.c:443
> bpf_struct_ops_map_free+0x1d6/0x310 kernel/bpf/bpf_struct_ops.c:1000
> bpf_map_free kernel/bpf/syscall.c:879 [inline]
> map_create+0x1033/0x2710 kernel/bpf/syscall.c:1604
> __sys_bpf+0x1b26/0x5390 kernel/bpf/syscall.c:6116
> __do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
> __se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
> __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6242
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xcb/0xfa0 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f403f7adead
> RSP: 002b:00007f4040570f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: 00007f403f9e5fa0 RCX: 00007f403f7adead
> RDX: 0000000000000050 RSI: 0000200000000300 RDI: 0000000000000000
> RBP: 00007f403f847d9f R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 0000000000000000 R14: 00007f403f9e5fa0 R15: 00007f4040551000
> </TASK>

It seems to be another thread in tasks trace RCU for too long but hung
task is detected first before tasks trace RCU stall detection kicks
in.

Might not be a real bug if it is a wild bpf program running for too
long using different tricks.

>
> Showing all locks held in the system:
> 1 lock held by ksoftirqd/1/23:
> 2 locks held by kworker/u9:0/26:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000000a17d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 3 locks held by kworker/u10:0/27:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000000a27d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> #2: ffffffff8efceb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x287/0x3b0 kernel/rcu/tree_exp.h:311
> 1 lock held by rcu_tasks_kthre/30:
> #0: ffffffff8efc2db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{4:4}, at: rcu_tasks_one_gp+0x708/0xd90 kernel/rcu/tasks.h:614
> 1 lock held by khungtaskd/34:
> #0: ffffffff8efc35e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
> #0: ffffffff8efc35e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
> #0: ffffffff8efc35e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
> 2 locks held by kworker/u9:2/54:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa000000140fd10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u10:2/71:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000001797d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 3 locks held by kworker/u9:3/85:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa000000283fd10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> #2: ffffffff8efcea40 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x6b0 kernel/rcu/tree.c:3820
> 2 locks held by kworker/u10:3/86:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa000000284fd10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 3 locks held by kworker/0:2/797:
> 2 locks held by kworker/u9:4/1065:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000007987d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 1 lock held by systemd-journal/5203:
> 3 locks held by sshd/9936:
> 2 locks held by kworker/u10:6/12939:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa000001188fd10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u9:6/13627:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa000000720fd10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u9:7/13628:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000004907d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u10:10/14055:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa00000044e7d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u10:11/14069:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000004477d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u9:9/14766:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000003867d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u10:14/68383:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa00000082f7d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 1 lock held by (udev-worker)/69289:
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x377/0xfa0 net/core/rtnetlink.c:6960
> 2 locks held by kworker/u10:15/72109:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa0000005c07d10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 2 locks held by kworker/u10:19/73952:
> #0: ff1100001c071948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x128c/0x1b60 kernel/workqueue.c:3238
> #1: ffa000000429fd10 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x8ec/0x1b60 kernel/workqueue.c:3239
> 1 lock held by syz-executor/91661:
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x4e1/0x1cf0 net/ipv6/addrconf.c:5027
> 4 locks held by (udev-worker)/91972:
> 1 lock held by (udev-worker)/92355:
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x377/0xfa0 net/core/rtnetlink.c:6960
> 1 lock held by syz-executor/94736:
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x7c0/0x1fb0 net/core/rtnetlink.c:4064
> 2 locks held by ifquery/95051:
> #0: ff11000065e796e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0x156/0x980 net/netlink/af_netlink.c:2406
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by ifquery/95294:
> #0: ff1100004c6b16e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0x72b/0xdc0 net/netlink/af_netlink.c:2269
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by ifquery/95343:
> #0: ff110000296816e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0x156/0x980 net/netlink/af_netlink.c:2406
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by ifquery/95358:
> #0: ff11000095bb96e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0x72b/0xdc0 net/netlink/af_netlink.c:2269
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by ifquery/95390:
> #0: ff1100012c1cf6e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0x72b/0xdc0 net/netlink/af_netlink.c:2269
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by ifquery/95537:
> #0: ff11000066a786e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0x72b/0xdc0 net/netlink/af_netlink.c:2269
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by ifquery/95624:
> #0: ff1100003234b6e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0x156/0x980 net/netlink/af_netlink.c:2406
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by ifquery/95801:
> #0: ff1100001c7766e0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0x72b/0xdc0 net/netlink/af_netlink.c:2269
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #1: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x199/0x200 net/core/rtnetlink.c:6822
> 2 locks held by syz.8.26153/96008:
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: bpf_xdp_link_release+0x1f/0x7b0 net/core/dev.c:10415
> #1: ffffffff90cdc7e8 (bpf_dispatcher_xdp.mutex){+.+.}-{4:4}, at: bpf_dispatcher_change_prog+0x38/0xa70 kernel/bpf/dispatcher.c:146
> 1 lock held by systemd-sysctl/96015:
> 2 locks held by systemd-sysctl/96039:
> 1 lock held by systemd-sysctl/96082:
> 1 lock held by syz.0.26192/96124:
> #0: ffffffff90cd7708 (rtnl_mutex){+.+.}-{4:4}, at: bpf_xdp_link_attach+0xe3/0x8d0 net/core/dev.c:10540
> 1 lock held by systemd-sysctl/96132:
> 3 locks held by syz.3.26196/96141:
> #0: ffffffff9b6827d0 (&pmus_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
> #0: ffffffff9b6827d0 (&pmus_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
> #0: ffffffff9b6827d0 (&pmus_srcu){.+.+}-{0:0}, at: class_srcu_constructor include/linux/srcu.h:508 [inline]
> #0: ffffffff9b6827d0 (&pmus_srcu){.+.+}-{0:0}, at: __do_sys_perf_event_open+0x332/0x2c30 kernel/events/core.c:13460
> #1: ffffffff8f05a688 (event_mutex){+.+.}-{4:4}, at: perf_trace_destroy+0x27/0x1c0 kernel/trace/trace_event_perf.c:239
> #2: ffffffff8efceb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3b0 kernel/rcu/tree_exp.h:343
> 4 locks held by ifupdown-hotplu/96139:
> 4 locks held by (spawn)/96149:
> 4 locks held by (spawn)/96153:
> 4 locks held by syz.6.26205/96158:
>
> =============================================
>
> NMI backtrace for cpu 0
> CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.17.0-g39e9d5f63075 #1 PREEMPT(full)
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:94 [inline]
> dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120
> nmi_cpu_backtrace+0x2a0/0x350 lib/nmi_backtrace.c:113
> nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
> trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
> check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
> watchdog+0xf16/0x1150 kernel/hung_task.c:495
> kthread+0x3d0/0x780 kernel/kthread.c:463
> ret_from_fork+0x676/0x7d0 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> </TASK>
> Sending NMI from CPU 0 to CPUs 1:
> NMI backtrace for cpu 1
> CPU: 1 UID: 0 PID: 64717 Comm: (udev-worker) Not tainted 6.17.0-g39e9d5f63075 #1 PREEMPT(full)
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> RIP: 0010:check_preemption_disabled+0x3e/0x170 lib/smp_processor_id.c:54
> Code: 44 8b 25 e9 6c 26 09 65 8b 1d de 6c 26 09 81 e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 15 0f 1f 44 00 00 44 89 e0 5b <5d> 41 5c 41 5d 41 5e c3 cc cc cc cc 0f 1f 44 00 00 9c 5b 81 e3 00
> RSP: 0018:ffa0000004fb7708 EFLAGS: 00000046
> RAX: 0000000000000001 RBX: ffa0000004fb7be0 RCX: ffa0000004fb8000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffffffff8bb08140 R08: 0000000000000001 R09: ffa0000004fb7bd8
> R10: 0000000000013d84 R11: 00000000000a34f6 R12: 0000000000000001
> R13: ffffffff8d707639 R14: ff11000116aa0000 R15: ffa0000004fb781c
> FS: 00007fb36ec948c0(0000) GS:ff1100020f8a7000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000557132ac66f0 CR3: 000000016a34d000 CR4: 0000000000753ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
> PKRU: 55555554
> Call Trace:
> <TASK>
> lockdep_recursion_inc kernel/locking/lockdep.c:465 [inline]
> lock_release+0x9d/0x2f0 kernel/locking/lockdep.c:5888
> rcu_lock_release include/linux/rcupdate.h:341 [inline]
> rcu_read_unlock include/linux/rcupdate.h:897 [inline]
> class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
> unwind_next_frame+0x3b6/0x20b0 arch/x86/kernel/unwind_orc.c:479
> arch_stack_walk+0x86/0xf0 arch/x86/kernel/stacktrace.c:25
> stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
> kasan_save_stack+0x24/0x50 mm/kasan/common.c:56
> kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:559
> __call_rcu_common.constprop.0+0xa4/0xa00 kernel/rcu/tree.c:3123
> security_inode_free+0xa5/0x170 security/security.c:1774
> __destroy_inode+0x201/0x730 fs/inode.c:371
> destroy_inode+0x91/0x1b0 fs/inode.c:394
> evict+0x598/0x8f0 fs/inode.c:834
> iput_final fs/inode.c:1914 [inline]
> iput.part.0+0x5e5/0xa20 fs/inode.c:1966
> iput+0x35/0x40 fs/inode.c:1929
> dentry_unlink_inode+0x296/0x470 fs/dcache.c:466
> __dentry_kill+0x1d2/0x600 fs/dcache.c:669
> dput.part.0+0x4b0/0x9b0 fs/dcache.c:911
> dput+0x1f/0x30 fs/dcache.c:901
> __fput+0x516/0xb50 fs/file_table.c:476
> fput_close_sync+0x10f/0x250 fs/file_table.c:573
> __do_sys_close fs/open.c:1589 [inline]
> __se_sys_close fs/open.c:1574 [inline]
> __x64_sys_close+0x8e/0x120 fs/open.c:1574
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xcb/0xfa0 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fb36ee7c9a0
> Code: 0d 00 00 00 eb b2 e8 0f f8 01 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 80 3d 41 1c 0e 00 00 74 17 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c
> RSP: 002b:00007ffce88f1408 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
> RAX: ffffffffffffffda RBX: 0000000000000012 RCX: 00007fb36ee7c9a0
> RDX: 0000557132824470 RSI: 0000000000000007 RDI: 0000000000000012
> RBP: 00007fb36ec946a0 R08: 0000000000000007 R09: 0000557132ac66f0
> R10: 00007ffce88f1528 R11: 0000000000000202 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000557132ae1b40 R15: 00007ffce88f1530
> </TASK>
>
> ```
>
> ## Kernel Configuration Requirements for Reproduction
>
> The vulnerability can be triggered with the kernel config in the attachment. Additionally, we provide the execution log and reproduction log in Syzkaller format to facilitate further verification.

[梅开彦]

Showing all locks held in the system: