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[ 9.237605][ T7] [ 9.237605][ T7] other info that might help us debug this: [ 9.237605][ T7] [ 9.239057][ T7] [ 9.239057][ T7] rcu_scheduler_active = 2, debug_locks = 1 [ 9.240153][ T7] 4 locks held by kworker/u4:0/7: [ 9.240882][ T7] #0: c5111cc0 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3211) [ 9.242349][ T7] #1: c951bef0 (deferred_probe_work){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:?) [ 9.243712][ T7] #2: c75e6c80 (&dev->mutex){....}-{4:4}, at: __device_attach (drivers/base/dd.c:1006) [ 9.244868][ T7] #3: c3f31254 (dsa2_mutex){+.+.}-{4:4}, at: dsa_register_switch (net/dsa/dsa.c:1499) [ 9.246218][ T7] [ 9.246218][ T7] stack backtrace: [ 9.247150][ T7] CPU: 0 UID: 0 PID: 7 Comm: kworker/u4:0 Tainted: G T 6.13.0-rc7-01139-g03abf2a7c654 #1 [ 9.248636][ T7] Tainted: [T]=RANDSTRUCT [ 9.249165][ T7] Workqueue: events_unbound deferred_probe_work_func [ 9.250080][ T7] Call Trace: [ 9.250503][ T7] dump_stack_lvl (lib/dump_stack.c:? lib/dump_stack.c:120) [ 9.251092][ T7] dump_stack (lib/dump_stack.c:129) [ 9.251610][ T7] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846) [ 9.252284][ T7] phy_detach (drivers/net/phy/phy_device.c:2004) [ 9.252804][ T7] phylink_connect_phy (drivers/net/phy/phylink.c:?) [ 9.253421][ T7] dsa_user_create (net/dsa/user.c:2657) [ 9.254067][ T7] dsa_port_setup (net/dsa/dsa.c:523) [ 9.254648][ T7] dsa_register_switch (net/dsa/dsa.c:759 net/dsa/dsa.c:888 net/dsa/dsa.c:1525 net/dsa/dsa.c:1539) [ 9.255298][ T7] dsa_loop_drv_probe (drivers/net/dsa/dsa_loop.c:343) [ 9.255927][ T7] mdio_probe (drivers/net/phy/mdio_device.c:166) [ 9.256445][ T7] really_probe (drivers/base/dd.c:581) [ 9.257004][ T7] __driver_probe_device (drivers/base/dd.c:800) [ 9.257624][ T7] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:? kernel/locking/lockdep.c:4406) [ 9.258384][ T7] ? trace_hardirqs_on (kernel/trace/trace_preemptirq.c:80) [ 9.259006][ T7] driver_probe_device (drivers/base/dd.c:830) [ 9.259624][ T7] __device_attach_driver (drivers/base/dd.c:959) [ 9.260257][ T7] ? coredump_store (drivers/base/dd.c:922) [ 9.260846][ T7] bus_for_each_drv (drivers/base/bus.c:459) [ 9.261459][ T7] __device_attach (drivers/base/dd.c:1030) [ 9.274224][ T7] ? coredump_store (drivers/base/dd.c:922) [ 9.274849][ T7] device_initial_probe (drivers/base/dd.c:1080) [ 9.275481][ T7] bus_probe_device (drivers/base/bus.c:536) [ 9.276057][ T7] deferred_probe_work_func (drivers/base/dd.c:124) [ 9.276734][ T7] process_one_work (kernel/workqueue.c:3241) [ 9.277401][ T7] worker_thread (kernel/workqueue.c:3311 kernel/workqueue.c:3398) [ 9.278006][ T7] kthread (kernel/kthread.c:391) [ 9.278532][ T7] ? worker_attach_to_pool (kernel/workqueue.c:3344) [ 9.279213][ T7] ? kthread_blkcg (kernel/kthread.c:342) [ 9.279803][ T7] ? kthread_blkcg (kernel/kthread.c:342) [ 9.280398][ T7] ret_from_fork (arch/x86/kernel/process.c:153) [ 9.280951][ T7] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 9.281536][ T7] entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 9.282546][ T7] dsa-loop fixed-0:1f lan1 (uninitialized): failed to connect to PHY: -EPERM [ 9.283900][ T7] dsa-loop fixed-0:1f lan1 (uninitialized): error -1 setting up PHY for tree 0, switch 0, port 0 [ 9.285629][ T7] dsa-loop fixed-0:1f lan2 (uninitialized): PHY [dsa-0.0:01] driver [Generic PHY] (irq=POLL) [ 9.287170][ T7] dsa-loop fixed-0:1f lan2 (uninitialized): failed to connect to PHY: -EPERM [ 9.288436][ T7] dsa-loop fixed-0:1f lan2 (uninitialized): error -1 setting up PHY for tree 0, switch 0, port 1 [ 9.290098][ T7] dsa-loop fixed-0:1f lan3 (uninitialized): PHY [dsa-0.0:02] driver [Generic PHY] (irq=POLL) [ 9.291626][ T7] dsa-loop fixed-0:1f lan3 (uninitialized): failed to connect to PHY: -EPERM [ 9.292898][ T7] dsa-loop fixed-0:1f lan3 (uninitialized): error -1 setting up PHY for tree 0, switch 0, port 2 [ 9.294593][ T7] dsa-loop fixed-0:1f lan4 (uninitialized): PHY [dsa-0.0:03] driver [Generic PHY] (irq=POLL) [ 9.296110][ T7] dsa-loop fixed-0:1f lan4 (uninitialized): failed to connect to PHY: -EPERM [ 9.297398][ T7] dsa-loop fixed-0:1f lan4 (uninitialized): error -1 setting up PHY for tree 0, switch 0, port 3 [ 9.299343][ T7] DSA: tree 0 setup [ 9.299993][ T7] dsa-loop fixed-0:1f: DSA mockup driver: 0x1f The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250122/202501221104.9fe82ac4-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki