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Date: Mon, 18 Jul 2022 12:03:39 +0200 From: Jan Kiszka <jan.kiszka@...mens.com> To: linux-arm-kernel <linux-arm-kernel@...ts.infradead.org> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: [5.19 regression?] refcount warning around am33xx_dt_clk_init Hi all, am I the only one getting this with 5.19-rc on a BeagleBoneBlack? 2022-07-18T09:32:52 [ 0.000000] Booting Linux on physical CPU 0x0 2022-07-18T09:32:52 [ 0.000000] Linux version 5.19.0-rc7 (builder@...ner-zhxxpox-project-479-concurrent-1gm4mk) (arm-linux-gnueabihf-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Mon Jul 18 05:54:15 UTC 2022 2022-07-18T09:32:52 [ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d 2022-07-18T09:32:52 start: 2.4.4.1 login-action (timeout 00:04:12) [common] 2022-07-18T09:32:52 Setting prompt string to ['-+\\[ cut here \\]-+\\s+(.*\\s+-+\\[ end trace (\\w*) \\]-+)', '(Unhandled fault.*)\\r\\n', 'Kernel panic - (.*) end Kernel panic', 'Stack:\\s+(.*\\s+-+\\[ end trace (\\w*) \\]-+)'] 2022-07-18T09:32:52 Using line separator: #'\n'# 2022-07-18T09:32:52 Waiting for the login prompt 2022-07-18T09:32:52 Parsing kernel messages 2022-07-18T09:32:52 ['-+\\[ cut here \\]-+\\s+(.*\\s+-+\\[ end trace (\\w*) \\]-+)', '(Unhandled fault.*)\\r\\n', 'Kernel panic - (.*) end Kernel panic', 'Stack:\\s+(.*\\s+-+\\[ end trace (\\w*) \\]-+)', 'root@...o:', 'demo login:', 'Login incorrect'] 2022-07-18T09:32:52 [login-action] Waiting for messages, (timeout 00:04:12) 2022-07-18T09:32:52 [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache 2022-07-18T09:32:52 [ 0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Black 2022-07-18T09:32:52 [ 0.000000] Memory policy: Data cache writeback 2022-07-18T09:32:52 [ 0.000000] efi: UEFI not found. 2022-07-18T09:32:52 [ 0.000000] cma: Reserved 64 MiB at 0x9b800000 2022-07-18T09:32:52 [ 0.000000] Zone ranges: 2022-07-18T09:32:52 [ 0.000000] DMA [mem 0x0000000080000000-0x000000009fdfffff] 2022-07-18T09:32:52 [ 0.000000] Normal empty 2022-07-18T09:32:52 [ 0.000000] HighMem empty 2022-07-18T09:32:52 [ 0.000000] Movable zone start for each node 2022-07-18T09:32:52 [ 0.000000] Early memory node ranges 2022-07-18T09:32:52 [ 0.000000] node 0: [mem 0x0000000080000000-0x000000009fdfffff] 2022-07-18T09:32:52 [ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x000000009fdfffff] 2022-07-18T09:32:52 [ 0.000000] CPU: All CPU(s) started in SVC mode. 2022-07-18T09:32:52 [ 0.000000] AM335X ES2.1 (sgx neon) 2022-07-18T09:32:52 [ 0.000000] percpu: Embedded 16 pages/cpu s34260 r8192 d23084 u65536 2022-07-18T09:32:52 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 129540 2022-07-18T09:32:52 [ 0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/nfs rw nfsroot=192.168.42.90:/var/lib/lava/dispatcher/tmp/4597/extract-nfsrootfs-c7i3rn5w,tcp,hard,vers=3 ip=dhcp 2022-07-18T09:32:52 [ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes, linear) 2022-07-18T09:32:52 [ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes, linear) 2022-07-18T09:32:52 [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off 2022-07-18T09:32:52 [ 0.000000] Memory: 425336K/522240K available (14336K kernel code, 2405K rwdata, 5892K rodata, 2048K init, 426K bss, 31368K reserved, 65536K cma-reserved, 0K highmem) 2022-07-18T09:32:52 [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 2022-07-18T09:32:52 [ 0.000000] trace event string verifier disabled 2022-07-18T09:32:52 [ 0.000000] rcu: Hierarchical RCU implementation. 2022-07-18T09:32:52 [ 0.000000] rcu: RCU event tracing is enabled. 2022-07-18T09:32:52 [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=16 to nr_cpu_ids=1. 2022-07-18T09:32:52 [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. 2022-07-18T09:32:52 [ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1 2022-07-18T09:32:52 [ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 2022-07-18T09:32:52 [ 0.000000] IRQ: Found an INTC at 0x(ptrval) (revision 5.0) with 128 interrupts 2022-07-18T09:32:52 [ 0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention. 2022-07-18T09:32:52 [ 0.000000] ------------[ cut here ]------------ 2022-07-18T09:32:52 [ 0.000000] WARNING: CPU: 0 PID: 0 at lib/refcount.c:25 kobject_get+0x9c/0xa0 2022-07-18T09:32:52 [ 0.000000] refcount_t: addition on 0; use-after-free. 2022-07-18T09:32:52 [ 0.000000] Modules linked in: 2022-07-18T09:32:52 [ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc7 #1 2022-07-18T09:32:52 [ 0.000000] Hardware name: Generic AM33XX (Flattened Device Tree) 2022-07-18T09:32:52 [ 0.000000] unwind_backtrace from show_stack+0x10/0x14 2022-07-18T09:32:52 [ 0.000000] show_stack from dump_stack_lvl+0x40/0x4c 2022-07-18T09:32:52 [ 0.000000] dump_stack_lvl from __warn+0xc8/0x13c 2022-07-18T09:32:52 [ 0.000000] __warn from warn_slowpath_fmt+0x78/0xa8 2022-07-18T09:32:52 [ 0.000000] warn_slowpath_fmt from kobject_get+0x9c/0xa0 2022-07-18T09:32:52 [ 0.000000] kobject_get from of_node_get+0x14/0x1c 2022-07-18T09:32:52 [ 0.000000] of_node_get from of_fwnode_get+0x34/0x40 2022-07-18T09:32:52 [ 0.000000] of_fwnode_get from fwnode_full_name_string+0x34/0xa0 2022-07-18T09:32:52 [ 0.000000] fwnode_full_name_string from device_node_string+0x604/0x6d0 2022-07-18T09:32:52 [ 0.000000] device_node_string from pointer+0x38c/0x5b0 2022-07-18T09:32:52 [ 0.000000] pointer from vsnprintf+0x230/0x3d4 2022-07-18T09:32:52 [ 0.000000] vsnprintf from vprintk_store+0x10c/0x3f8 2022-07-18T09:32:52 [ 0.000000] vprintk_store from vprintk_emit+0x70/0x23c 2022-07-18T09:32:52 [ 0.000000] vprintk_emit from vprintk_default+0x20/0x28 2022-07-18T09:32:52 [ 0.000000] vprintk_default from _printk+0x2c/0x5c 2022-07-18T09:32:52 [ 0.000000] _printk from of_node_release+0x11c/0x124 2022-07-18T09:32:52 [ 0.000000] of_node_release from kobject_put+0x98/0x104 2022-07-18T09:32:52 [ 0.000000] kobject_put from ti_dt_clocks_register+0x278/0x328 2022-07-18T09:32:52 [ 0.000000] ti_dt_clocks_register from am33xx_dt_clk_init+0x14/0xa4 2022-07-18T09:32:52 [ 0.000000] am33xx_dt_clk_init from omap_init_time_of+0x8/0x10 2022-07-18T09:32:52 [ 0.000000] omap_init_time_of from start_kernel+0x4f8/0x6b0 2022-07-18T09:32:52 [ 0.000000] start_kernel from 0x0 2022-07-18T09:32:52 [ 0.000000] ---[ end trace 0000000000000000 ]--- It's with latest 5.19-rc7, using the multi_v7_defconfig. Jan -- Siemens AG, Technology Competence Center Embedded Linux
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