Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free  nvmet_tcp_release_queue_work() runs on nvmet-wq and can drop the final controller reference through nvmet_cq_put(). If that triggers nvmet_ctrl_free(), the teardown path flushes ctrl->async_event_work on the same nvmet-wq.  Call chain:   nvmet_tcp_schedule_release_queue()    kref_put(&queue->kref, nvmet_tcp_release_queue)      nvmet_tcp_release_queue()        queue_work(nvmet_wq, &queue->release_work) <--- nvmet_wq          process_one_work()            nvmet_tcp_release_queue_work()              nvmet_cq_put(&queue->nvme_cq)                nvmet_cq_destroy()                  nvmet_ctrl_put(cq->ctrl)                    nvmet_ctrl_free()                      flush_work(&ctrl->async_event_work) <--- nvmet_wq                        Previously Scheduled by :- 		        nvmet_add_async_event 		          queue_work(nvmet_wq, &ctrl->async_event_work);  This trips lockdep with a possible recursive locking warning.  [ 5223.015876] run blktests nvme/003 at 2026-04-07 20:53:55 [ 5223.061801] loop0: detected capacity change from 0 to 2097152 [ 5223.072206] nvmet: adding nsid 1 to subsystem blktests-subsystem-1 [ 5223.088368] nvmet_tcp: enabling port 0 (127.0.0.1:4420) [ 5223.126086] nvmet: Created discovery controller 1 for subsystem nqn.2014-08.org.nvmexpress.discovery for NQN nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349. [ 5223.128453] nvme nvme1: new ctrl: NQN "nqn.2014-08.org.nvmexpress.discovery", addr 127.0.0.1:4420, hostnqn: nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349 [ 5233.199447] nvme nvme1: Removing ctrl: NQN "nqn.2014-08.org.nvmexpress.discovery"  [ 5233.227718] ============================================ [ 5233.231283] WARNING: possible recursive locking detected [ 5233.234696] 7.0.0-rc3nvme+ #20 Tainted: G           O     N [ 5233.238434] -------------------------------------------- [ 5233.241852] kworker/u192:6/2413 is trying to acquire lock: [ 5233.245429] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x26/0x90 [ 5233.251438]                but task is already holding lock: [ 5233.255254] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x5cc/0x6e0 [ 5233.261125]                other info that might help us debug this: [ 5233.265333]  Possible unsafe locking scenario:  [ 5233.269217]        CPU0 [ 5233.270795]        ---- [ 5233.272436]   lock((wq_completion)nvmet-wq); [ 5233.275241]   lock((wq_completion)nvmet-wq); [ 5233.278020]                 *** DEADLOCK ***  [ 5233.281793]  May be due to missing lock nesting notation  [ 5233.286195] 3 locks held by kworker/u192:6/2413: [ 5233.289192]  #0: ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x5cc/0x6e0 [ 5233.294569]  #1: ffffc9000e2a7e40 ((work_completion)(&queue->release_work)){+.+.}-{0:0}, at: process_one_work+0x1c5/0x6e0 [ 5233.300128]  #2: ffffffff82d7dc40 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x62/0x530 [ 5233.304290]                stack backtrace: [ 5233.306520] CPU: 4 UID: 0 PID: 2413 Comm: kworker/u192:6 Tainted: G           O     N  7.0.0-rc3nvme+ #20 PREEMPT(full) [ 5233.306524] Tainted: [O]=OOT_MODULE, [N]=TEST [ 5233.306525] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 [ 5233.306527] Workqueue: nvmet-wq nvmet_tcp_release_queue_work [nvmet_tcp] [ 5233.306532] Call Trace: [ 5233.306534]  <TASK> [ 5233.306536]  dump_stack_lvl+0x73/0xb0 [ 5233.306552]  print_deadlock_bug+0x225/0x2f0 [ 5233.306556]  __lock_acquire+0x13f0/0x2290 [ 5233.306563]  lock_acquire+0xd0/0x300 [ 5233.306565]  ? touch_wq_lockdep_map+0x26/0x90 [ 5233.306571]  ? __flush_work+0x20b/0x530 [ 5233.306573]  ? touch_wq_lockdep_map+0x26/0x90 [ 5233.306577]  touch_wq_lockdep_map+0x3b/0x90 [ 5233.306580]  ? touch_wq_lockdep_map+0x26/0x90 [ 52 ---truncated---