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Date: Thu, 18 Feb 2021 09:46:22 +0100 From: Michael Walle <michael@...le.cc> To: Greg KH <gregkh@...uxfoundation.org> Cc: linux-kernel@...r.kernel.org, maz@...nel.org, tglx@...utronix.de Subject: Re: [PATCH] irqdomain: remove debugfs_file from struct irq_domain Am 2021-02-18 09:40, schrieb Greg KH: > On Wed, Feb 17, 2021 at 08:57:17PM +0100, Michael Walle wrote: >> Hi Greg, >> >> > There's no need to keep around a dentry pointer to a simple file that >> > debugfs itself can look up when we need to remove it from the system. >> > So simplify the code by deleting the variable and cleaning up the logic >> > around the debugfs file. >> >> This will generate the following oops on my board (arm64, >> freescale/fsl-ls1028a-kontron-sl28-var3-ads2.dts). In debugfs_lookup() >> debugfs_mount is NULL. >> >> [ 0.000000] Linux version 5.11.0-next-20210217-00014-g41e0e92a2d05 >> (mwalle@...lle01) (aarch64-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU >> ld (GNU Binutils for Debian) 2.31.1) #69 SMP PREEMPT Wed Feb 17 >> 20:47:10 CET 2021 >> [..] >> [ 0.000000] Unable to handle kernel NULL pointer dereference at >> virtual address 0000000000000000 >> [ 0.000000] Mem abort info: >> [ 0.000000] ESR = 0x96000004 > > <snip> > > Back to this log, do you see: > "Unable to pin filesystem for file " > anywhere before this crash? No. Here is the complete log: [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd083] [ 0.000000] Linux version 5.11.0-next-20210217-00013-g960bc30321c0-dirty (mwalle@...lle01) (aarch64-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #73 SMP PREEMPT Thu Feb 18 09:19:21 CET 2021 [ 0.000000] Machine model: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier [ 0.000000] efi: UEFI not found. [ 0.000000] earlycon: ns16550a0 at MMIO 0x00000000021c0500 (options '115200n8') [ 0.000000] printk: bootconsole [ns16550a0] enabled [ 0.000000] NUMA: No NUMA configuration found [ 0.000000] NUMA: Faking a node at [mem 0x0000000080000000-0x00000020ffffffff] [ 0.000000] NUMA: NODE_DATA [mem 0x20ff7d9200-0x20ff7dafff] [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000000000000-0x00000000ffffffff] [ 0.000000] DMA32 empty [ 0.000000] Normal [mem 0x0000000100000000-0x00000020ffffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000080000000-0x00000000ffffffff] [ 0.000000] node 0: [mem 0x0000002080000000-0x00000020ffffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x00000020ffffffff] [ 0.000000] On node 0 totalpages: 1048576 [ 0.000000] DMA zone: 8192 pages used for memmap [ 0.000000] DMA zone: 0 pages reserved [ 0.000000] DMA zone: 524288 pages, LIFO batch:63 [ 0.000000] Normal zone: 8192 pages used for memmap [ 0.000000] Normal zone: 524288 pages, LIFO batch:63 [ 0.000000] cma: Reserved 32 MiB at 0x00000000fcc00000 [ 0.000000] percpu: Embedded 31 pages/cpu s89752 r8192 d29032 u126976 [ 0.000000] pcpu-alloc: s89752 r8192 d29032 u126976 alloc=31*4096 [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [ 0.000000] Detected PIPT I-cache on CPU0 [ 0.000000] CPU features: detected: GIC system register CPU interface [ 0.000000] CPU features: detected: Spectre-v3a [ 0.000000] CPU features: detected: Spectre-v2 [ 0.000000] CPU features: detected: Spectre-v4 [ 0.000000] CPU features: detected: ARM errata 1165522, 1319367, or 1530923 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 1032192 [ 0.000000] Policy zone: Normal [ 0.000000] Kernel command line: debug root=/dev/mmcblk0p2 rootwait earlycon [ 0.000000] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes, linear) [ 0.000000] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes, linear) [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off [ 0.000000] software IO TLB: mapped [mem 0x00000000f8c00000-0x00000000fcc00000] (64MB) [ 0.000000] Memory: 3986440K/4194304K available (14912K kernel code, 2164K rwdata, 5876K rodata, 4864K init, 849K bss, 175096K reserved, 32768K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] ftrace: allocating 52190 entries in 204 pages [ 0.000000] ftrace: allocated 204 pages with 4 groups [ 0.000000] rcu: Preemptible hierarchical RCU implementation. [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=2. [ 0.000000] Trampoline variant of Tasks RCU enabled. [ 0.000000] Rude variant of Tasks RCU enabled. [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies. [ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 [ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0 [ 0.000000] GICv3: GIC: Using split EOI/Deactivate mode [ 0.000000] GICv3: 256 SPIs implemented [ 0.000000] GICv3: 0 Extended SPIs implemented [ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000004 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000004 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] [0000000000000000] user address but active_mm is swapper [ 0.000000] Internal error: Oops: 96000004 [#1] PREEMPT SMP [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-next-20210217-00013-g960bc30321c0-dirty #73 [ 0.000000] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT) [ 0.000000] pstate: 00000085 (nzcv daIf -PAN -UAO -TCO BTYPE=--) [ 0.000000] pc : debugfs_lookup+0x5c/0x94 [ 0.000000] lr : debugfs_lookup+0x3c/0x94 [ 0.000000] sp : ffff800011933ca0 [ 0.000000] x29: ffff800011933ca0 x28: 0000000000000000 [ 0.000000] x27: 0000000000000000 x26: 0000000000000001 [ 0.000000] x25: ffff00200016f100 x24: ffff800010f19750 [ 0.000000] x23: ffff80001193d000 x22: ffff800011939948 [ 0.000000] x21: ffff8000119cbcc8 x20: 0000000000000000 [ 0.000000] x19: ffff00200016f200 x18: 0000000000000010 [ 0.000000] x17: 0000000000007fff x16: 00000000ffffffff [ 0.000000] x15: ffffffffffffffff x14: ffff800011939948 [ 0.000000] x13: ffff8000919339a7 x12: ffff8000119cb670 [ 0.000000] x11: 0000000000000003 x10: ffff8000119b3630 [ 0.000000] x9 : ffff800010102bc4 x8 : 0000000000017fe8 [ 0.000000] x7 : c0000000ffffefff x6 : 0000000000000001 [ 0.000000] x5 : 0000000000000000 x4 : 0000000000000000 [ 0.000000] x3 : 00000000ffffffff x2 : 0000000000000000 [ 0.000000] x1 : 0000000000000000 x0 : 0000000000000000 [ 0.000000] Call trace: [ 0.000000] debugfs_lookup+0x5c/0x94 [ 0.000000] debugfs_remove_domain_dir+0x24/0x38 [ 0.000000] irq_domain_update_bus_token+0x6c/0xb8 [ 0.000000] gic_init_bases+0x19c/0x64c [ 0.000000] gic_of_init+0x188/0x228 [ 0.000000] of_irq_init+0x1a8/0x350 [ 0.000000] irqchip_init+0x20/0x48 [ 0.000000] init_IRQ+0xd4/0x178 [ 0.000000] start_kernel+0x628/0x85c [ 0.000000] 0x0 [ 0.000000] Code: 540001a8 b5000094 b0006ca0 f947d000 (f9400014) [ 0.000000] random: get_random_bytes called from print_oops_end_marker+0x34/0x60 with crng_init=0 [ 0.000000] ---[ end trace 0000000000000000 ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- -michael
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