Hey,
On Mon, Jul 24, 2023 at 07:54:02PM +0100, Matthew Wilcox (Oracle) wrote:
> Remove the TCP layering violation by allowing per-VMA locks on all VMAs.
> The fault path will immediately fail in handle_mm_fault(). There may be
> a small performance reduction from this patch as a little unnecessary work
> will be done on each page fault. See later patches for the improvement.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> Reviewed-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
> Cc: Arjun Roy <arjunroy@xxxxxxxxxx>
> Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Unless my bisection has gone awry, this is causing boot failures for me
in today's linux-next w/ a splat like so.
Full log and bisection log below, it reproduces on this hardware using
the standard riscv 64-bit defconfig, although my bisection was done with
some more debugging stuff enabled.
=====================================
WARNING: bad unlock balance detected!
6.5.0-rc3-next-20230725 #1 Not tainted
-------------------------------------
modprobe/58 is trying to release lock (&vma->vm_lock->lock) at:
[<ffffffff8000dcfa>] vma_end_read+0x60/0xb8
but there are no more locks to release!
other info that might help us debug this:
1 lock held by modprobe/58:
#0: ffffffff8169daa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x2e
stack backtrace:
CPU: 3 PID: 58 Comm: modprobe Not tainted 6.5.0-rc3-next-20230725 #1
Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
Call Trace:
[<ffffffff80006b48>] show_stack+0x2c/0x38
[<ffffffff80b49bb2>] dump_stack_lvl+0x60/0x82
[<ffffffff80b49be8>] dump_stack+0x14/0x1c
[<ffffffff80089d5a>] print_unlock_imbalance_bug+0x1cc/0x1d6
[<ffffffff80085e4a>] lock_release+0x236/0x3ae
[<ffffffff8007e464>] up_read+0x16/0x26
[<ffffffff8000dcfa>] vma_end_read+0x60/0xb8
[<ffffffff8000d9ca>] handle_page_fault+0x19e/0x3a4
[<ffffffff80b4a18c>] do_page_fault+0x20/0x56
[<ffffffff80004434>] ret_from_exception+0x0/0x64
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(tmp < 0): count = 0xffffffffffffff00, magic = 0xffffffe7c63c1558, owner = 0x1, curr 0xffffffe7c0add600, list empty
WARNING: CPU: 3 PID: 58 at kernel/locking/rwsem.c:1348 __up_read+0x1c2/0x224
Modules linked in:
CPU: 3 PID: 58 Comm: modprobe Not tainted 6.5.0-rc3-next-20230725 #1
Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
epc : __up_read+0x1c2/0x224
ra : __up_read+0x1c2/0x224
epc : ffffffff8007e636 ra : ffffffff8007e636 sp : ffffffc8002b3df0
gp : ffffffff818ad0f0 tp : ffffffe7c0add600 t0 : ffffffc8002b3ab8
t1 : 0000000000000044 t2 : 5357525f47554245 s0 : ffffffc8002b3e20
s1 : ffffffffffffff00 a0 : b32cfaf25517f300 a1 : b32cfaf25517f300
a2 : b32cfaf25517f300 a3 : c0000000ffffefff a4 : 00000fff00000000
a5 : 0000000000000004 a6 : ffffffff81643e90 a7 : 0000000000000038
s2 : ffffffe7c63c1560 s3 : ffffffff81ae3578 s4 : ffffffe7c63c1558
s5 : ffffffc8002b3ee0 s6 : 0000000000000254 s7 : ffffffe7c63c05a0
s8 : 0000003f97687780 s9 : ffffffffeffffef5 s10: 000000006474e553
s11: 0000000000000000 t3 : ffffffff8259430f t4 : ffffffff8259430f
t5 : ffffffff82594310 t6 : ffffffff8259430f
status: 0000000200000120 badaddr: 0000000000000000 cause: 0000000000000003
[<ffffffff8007e636>] __up_read+0x1c2/0x224
[<ffffffff8007e46a>] up_read+0x1c/0x26
[<ffffffff8000dcfa>] vma_end_read+0x60/0xb8
[<ffffffff8000d9ca>] handle_page_fault+0x19e/0x3a4
[<ffffffff80b4a18c>] do_page_fault+0x20/0x56
[<ffffffff80004434>] ret_from_exception+0x0/0x64
irq event stamp: 371
hardirqs last enabled at (371): [<ffffffff8000d862>] handle_page_fault+0x36/0x3a4
hardirqs last disabled at (370): [<ffffffff80b4aef6>] irqentry_enter+0x16/0x4c
softirqs last enabled at (180): [<ffffffff80b56566>] __do_softirq+0x57e/0x66e
softirqs last disabled at (173): [<ffffffff8001f288>] __irq_exit_rcu+0x8c/0x14c
---[ end trace 0000000000000000 ]---
Thanks,
Conor.
git bisect start
# status: waiting for both good and bad commits
# good: [06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5] Linux 6.5-rc1
git bisect good 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
# status: waiting for bad commit, 1 good commit known
# bad: [1e25dd7772483f477f79986d956028e9f47f990a] Add linux-next specific files for 20230725
git bisect bad 1e25dd7772483f477f79986d956028e9f47f990a
# bad: [73002c8a551db94daa4124dbe61a3340999c556e] Merge branch 'master' of git://linuxtv.org/mchehab/media-next.git
git bisect bad 73002c8a551db94daa4124dbe61a3340999c556e
# bad: [c37659958e0ff5aaffae86df9e696638f58cd3a3] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/joel/bmc.git
git bisect bad c37659958e0ff5aaffae86df9e696638f58cd3a3
# good: [bdd1d82e7d02bd2764a68a5cc54533dfc2ba452a] Merge tag 'io_uring-6.5-2023-07-21' of git://git.kernel.dk/linux
git bisect good bdd1d82e7d02bd2764a68a5cc54533dfc2ba452a
# good: [d7b4fea201483d40b7cb1f522915531c6e6b168b] mm/page_io: convert count_swpout_vm_event() to take in a folio
git bisect good d7b4fea201483d40b7cb1f522915531c6e6b168b
# good: [46dce626e248cc91b0612f7c6c31b15f48899465] Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
git bisect good 46dce626e248cc91b0612f7c6c31b15f48899465
# bad: [e3fb201f858b63a7abf71b5bb563923b6424b98a] Merge branch 'mm-nonmm-unstable' into mm-everything
git bisect bad e3fb201f858b63a7abf71b5bb563923b6424b98a
# good: [1e0fb16464b68936b1b901a7b908c37d6f587b7c] arm64: smccc: replace custom COUNT_ARGS() & CONCATENATE() implementations
git bisect good 1e0fb16464b68936b1b901a7b908c37d6f587b7c
# good: [de32a89e11bab2e9c8c881fbbbad84a492d5ce9c] mm: set up vma iterator for vma_iter_prealloc() calls
git bisect good de32a89e11bab2e9c8c881fbbbad84a492d5ce9c
# bad: [add29438034569277ab967199af39fe42a4d858c] mm: handle PUD faults under the VMA lock
git bisect bad add29438034569277ab967199af39fe42a4d858c
# good: [ecc821b0404e19eebf393f7a5a73d80c3faa69e4] maple_tree: reduce resets during store setup
git bisect good ecc821b0404e19eebf393f7a5a73d80c3faa69e4
# good: [4e9c4f4a2949a2b47917647283799bb5952f2290] mm: remove CONFIG_PER_VMA_LOCK ifdefs
git bisect good 4e9c4f4a2949a2b47917647283799bb5952f2290
# bad: [9a709e2cca6097f66aaba411bd8758cf43a39eb9] mm: move FAULT_FLAG_VMA_LOCK check from handle_mm_fault()
git bisect bad 9a709e2cca6097f66aaba411bd8758cf43a39eb9
# bad: [78b696bb953cb0b553e1cf9084a6e09580aa4e2a] mm: allow per-VMA locks on file-backed VMAs
git bisect bad 78b696bb953cb0b553e1cf9084a6e09580aa4e2a
# first bad commit: [78b696bb953cb0b553e1cf9084a6e09580aa4e2a] mm: allow per-VMA locks on file-backed VMAs
[ 0.000000] Linux version 6.5.0-rc3-00283-g78b696bb953c (conor@wendy) (ClangBuiltLinux clang version 15.0.7 (/home/
conor/stuff/dev/llvm/clang 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a), ClangBuiltLinux LLD 15.0.7) #1 SMP PREEMPT @666
[ 0.000000] Machine model: Microchip PolarFire-SoC Icicle Kit
[ 0.000000] SBI specification v1.0 detected
[ 0.000000] SBI implementation ID=0x1 Version=0x10002
[ 0.000000] SBI TIME extension detected
[ 0.000000] SBI IPI extension detected
[ 0.000000] SBI RFENCE extension detected
[ 0.000000] SBI SRST extension detected
[ 0.000000] earlycon: ns16550a0 at MMIO32 0x0000000020100000 (options '115200n8')
[ 0.000000] printk: bootconsole [ns16550a0] enabled
[ 0.000000] printk: debug: skip boot console de-registration.
[ 0.000000] efi: UEFI not found.
[ 0.000000] OF: reserved mem: 0x00000000bfc00000..0x00000000bfffffff (4096 KiB) nomap non-reusable region@BFC00000
[ 0.000000] Zone ranges:
[ 0.000000] DMA32 [mem 0x0000000080000000-0x00000000ffffffff]
[ 0.000000] Normal [mem 0x0000000100000000-0x000000107fffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000080000000-0x00000000bfbfffff]
[ 0.000000] node 0: [mem 0x00000000bfc00000-0x00000000bfffffff]
[ 0.000000] node 0: [mem 0x0000001040000000-0x000000107fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x000000107fffffff]
[ 0.000000] SBI HSM extension detected
[ 0.000000] CPU with hartid=0 is not available
[ 0.000000] riscv: base ISA extensions acdfim
[ 0.000000] riscv: ELF capabilities acdfim
[ 0.000000] percpu: Embedded 30 pages/cpu s84320 r8192 d30368 u122880
[ 0.000000] Kernel command line: earlycon keep_bootcon root=/dev/mmcblk1p2 rootdelay=10 reboot=cold
[ 0.000000] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes, linear)
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 517120
[ 0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
[ 0.000000] software IO TLB: area num 4.
[ 0.000000] software IO TLB: mapped [mem 0x00000000bbc00000-0x00000000bfc00000] (64MB)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] fixmap : 0xffffffc6fea00000 - 0xffffffc6ff000000 (6144 kB)
[ 0.000000] pci io : 0xffffffc6ff000000 - 0xffffffc700000000 ( 16 MB)
[ 0.000000] vmemmap : 0xffffffc700000000 - 0xffffffc800000000 (4096 MB)
[ 0.000000] vmalloc : 0xffffffc800000000 - 0xffffffd800000000 ( 64 GB)
[ 0.000000] modules : 0xffffffff025d4000 - 0xffffffff80000000 (2010 MB)
[ 0.000000] lowmem : 0xffffffd800000000 - 0xffffffe800000000 ( 64 GB)
[ 0.000000] kernel : 0xffffffff80000000 - 0xffffffffffffffff (2047 MB)
[ 0.000000] Memory: 1913560K/2097152K available (11570K kernel code, 5054K rwdata, 4096K rodata, 6069K init, 11226K
bss, 183592K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] trace event string verifier disabled
[ 0.000000] Running RCU self tests
[ 0.000000] Running RCU synchronous self tests
[ 0.000000] rcu: Preemptible hierarchical RCU implementation.
[ 0.000000] rcu: RCU lockdep checking is enabled.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=4.
[ 0.000000] rcu: RCU debug extended QS entry/exit.
[ 0.000000] Trampoline variant of Tasks RCU enabled.
[ 0.000000] Tracing 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=4
[ 0.000000] Running RCU synchronous self tests
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] riscv-intc: unable to find hart id for /cpus/cpu@0/interrupt-controller
[ 0.000000] riscv-intc: 64 local interrupts mapped
[ 0.000000] plic: interrupt-controller@c000000: mapped 186 interrupts with 4 handlers for 9 contexts.
[ 0.000000] riscv: providing IPIs using SBI IPI extension
[ 0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[ 0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 3526361616960 ns
[ 0.000003] sched_clock: 64 bits at 1000kHz, resolution 1000ns, wraps every 2199023255500ns
[ 0.010570] Console: colour dummy device 80x25
[ 0.015820] printk: console [tty0] enabled
[ 0.020660] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[ 0.029527] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 0.034262] ... MAX_LOCK_DEPTH: 48
[ 0.039096] ... MAX_LOCKDEP_KEYS: 8192
[ 0.044121] ... CLASSHASH_SIZE: 4096
[ 0.049148] ... MAX_LOCKDEP_ENTRIES: 32768
[ 0.054277] ... MAX_LOCKDEP_CHAINS: 65536
[ 0.059407] ... CHAINHASH_SIZE: 32768
[ 0.064539] memory used by lock dependency info: 6493 kB
[ 0.070744] memory used for stack traces: 4224 kB
[ 0.076263] per task-struct memory footprint: 1920 bytes
[ 0.082662] Calibrating delay loop (skipped), value calculated using timer frequency.. 2.00 BogoMIPS (lpj=4000)
[ 0.094225] pid_max: default: 32768 minimum: 301
[ 0.100802] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
[ 0.109469] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
[ 0.125003] Running RCU synchronous self tests
[ 0.130214] Running RCU synchronous self tests
[ 0.137709] CPU node for /cpus/cpu@0 exist but the possible cpu range is :0-3
[ 0.155633] RCU Tasks: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1.
[ 0.164714] RCU Tasks Trace: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1.
[ 0.174340] Running RCU-tasks wait API self tests
[ 0.286157] riscv: ELF compat mode unsupported
[ 0.286208] ASID allocator disabled (0 bits)
[ 0.296532] Callback from call_rcu_tasks_trace() invoked.
[ 0.304124] rcu: Hierarchical SRCU implementation.
[ 0.309791] rcu: Max phase no-delay instances is 1000.
[ 0.321671] EFI services will not be available.
[ 0.329990] smp: Bringing up secondary CPUs ...
[ 0.354947] smp: Brought up 1 node, 4 CPUs
[ 0.365578] devtmpfs: initialized
[ 0.410073] Running RCU synchronous self tests
[ 0.416094] Running RCU synchronous self tests
[ 0.421843] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.433116] futex hash table entries: 1024 (order: 5, 131072 bytes, linear)
[ 0.442918] pinctrl core: initialized pinctrl subsystem
[ 0.456687] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.468413] DMA: preallocated 256 KiB GFP_KERNEL pool for atomic allocations
[ 0.476749] DMA: preallocated 256 KiB GFP_KERNEL|GFP_DMA32 pool for atomic allocations
[ 0.492183] cpuidle: using governor menu
[ 0.558914] Callback from call_rcu_tasks() invoked.
[ 0.613189] HugeTLB: registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.621137] HugeTLB: 0 KiB vmemmap can be freed for a 2.00 MiB page
[ 0.635532] ACPI: Interpreter disabled.
[ 0.659634] SCSI subsystem initialized
[ 0.667627] usbcore: registered new interface driver usbfs
[ 0.674440] usbcore: registered new interface driver hub
[ 0.680969] usbcore: registered new device driver usb
[ 0.690490] FPGA manager framework
[ 0.703508] vgaarb: loaded
[ 0.708569] clocksource: Switched to clocksource riscv_clocksource
[ 0.723150] pnp: PnP ACPI: disabled
[ 0.809949] NET: Registered PF_INET protocol family
[ 0.818618] IP idents hash table entries: 32768 (order: 6, 262144 bytes, linear)
[ 0.839293] tcp_listen_portaddr_hash hash table entries: 1024 (order: 4, 73728 bytes, linear)
[ 0.850714] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.859721] TCP established hash table entries: 16384 (order: 5, 131072 bytes, linear)
[ 0.872260] TCP bind hash table entries: 16384 (order: 9, 2359296 bytes, linear)
[ 0.902395] TCP: Hash tables configured (established 16384 bind 16384)
[ 0.911840] UDP hash table entries: 1024 (order: 5, 163840 bytes, linear)
[ 0.921420] UDP-Lite hash table entries: 1024 (order: 5, 163840 bytes, linear)
[ 0.932233] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 0.943727] RPC: Registered named UNIX socket transport module.
[ 0.950879] RPC: Registered udp transport module.
[ 0.956374] RPC: Registered tcp transport module.
[ 0.961926] RPC: Registered tcp-with-tls transport module.
[ 0.968707] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.976198] PCI: CLS 0 bytes, default 64
[ 0.985222] Unpacking initramfs...
[ 1.000909] workingset: timestamp_bits=62 max_order=19 bucket_order=0
[ 1.016047] NFS: Registering the id_resolver key type
[ 1.022604] Key type id_resolver registered
[ 1.027625] Key type id_legacy registered
[ 1.032619] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 1.040698] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering...
[ 1.050868] 9p: Installing v9fs 9p2000 file system support
[ 1.059351] NET: Registered PF_ALG protocol family
[ 1.065759] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 246)
[ 1.074615] io scheduler mq-deadline registered
[ 1.079954] io scheduler kyber registered
[ 1.084855] io scheduler bfq registered
[ 2.691196] String selftests succeeded
[ 2.695696] test_string_helpers: Running tests...
[ 2.735759] microchip-pcie 3000000000.pcie: host bridge /pcie@3000000000 ranges:
[ 2.744646] microchip-pcie 3000000000.pcie: MEM 0x3008000000..0x3087ffffff -> 0x0008000000
[ 2.754854] microchip-pcie 3000000000.pcie: IB MEM 0x0000000000..0x00ffffffff -> 0x0000000000
[ 2.793603] microchip-pcie 3000000000.pcie: ECAM at [mem 0x3000000000-0x3007ffffff] for [bus 00-7f]
[ 2.806599] microchip-pcie 3000000000.pcie: PCI host bridge to bus 0000:00
[ 2.814622] pci_bus 0000:00: root bus resource [bus 00-7f]
[ 2.821060] pci_bus 0000:00: root bus resource [mem 0x3008000000-0x3087ffffff] (bus address [0x08000000-0x87ffffff]
)
[ 2.833923] pci 0000:00:00.0: [11aa:1556] type 01 class 0x000604
[ 2.841032] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x7fffffff 64bit pref]
[ 2.850230] pci 0000:00:00.0: supports D1 D2
[ 2.855282] pci 0000:00:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[ 2.918454] pci_bus 0000:01: busn_res: [bus 01-7f] end is updated to 01
[ 2.926316] pci 0000:00:00.0: BAR 0: no space for [mem size 0x80000000 64bit pref]
[ 2.935124] pci 0000:00:00.0: BAR 0: failed to assign [mem size 0x80000000 64bit pref]
[ 2.944337] pci 0000:00:00.0: BAR 8: assigned [mem 0x3008000000-0x30081fffff]
[ 2.952729] pci 0000:00:00.0: BAR 9: assigned [mem 0x3008200000-0x30083fffff 64bit pref]
[ 2.962291] pci 0000:00:00.0: BAR 7: no space for [io size 0x1000]
[ 2.969658] pci 0000:00:00.0: BAR 7: failed to assign [io size 0x1000]
[ 2.977402] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 2.983258] pci 0000:00:00.0: bridge window [mem 0x3008000000-0x30081fffff]
[ 2.991555] pci 0000:00:00.0: bridge window [mem 0x3008200000-0x30083fffff 64bit pref]
[ 3.012105] CCACHE: 4 banks, 16 ways, sets/bank=512, bytes/block=64
[ 3.019534] CCACHE: Index of the largest way enabled: 11
[ 3.553216] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[ 3.599227] 20100000.serial: ttyS1 at MMIO 0x20100000 (irq = 53, base_baud = 9375000) is a 16550A
[ 3.610933] printk: console [ttyS1] enabled
[ 3.610933] printk: console [ttyS1] enabled
[ 3.635869] 20102000.serial: ttyS2 at MMIO 0x20102000 (irq = 54, base_baud = 9375000) is a 16550A
[ 3.670527] 20104000.serial: ttyS3 at MMIO 0x20104000 (irq = 55, base_baud = 9375000) is a 16550A
[ 3.706515] 20106000.serial: ttyS0 at MMIO 0x20106000 (irq = 56, base_baud = 9375000) is a 16550A
[ 3.823007] loop: module loaded
[ 3.839186] zram: Added device: zram0
[ 3.867557] microchip-corespi 20108000.spi: Registered SPI controller 0
[ 3.887509] microchip-corespi 20109000.spi: Registered SPI controller 1
[ 5.062117] macb 20110000.ethernet eth0: Cadence GEM rev 0x0107010c at 0x20110000 irq 60 (00:04:a3:bf:d2:70)
[ 6.106111] Freeing initrd memory: 25480K
[ 6.124243]
[ 6.127470] =====================================
[ 6.137414] WARNING: bad unlock balance detected!
[ 6.147364] 6.5.0-rc3-next-20230725 #1 Not tainted
[ 6.157500] -------------------------------------
[ 6.167447] modprobe/58 is trying to release lock (&vma->vm_lock->lock) at:
[ 6.182194] [<ffffffff8000dcfa>] vma_end_read+0x60/0xb8
[ 6.193279] but there are no more locks to release!
[ 6.203590]
[ 6.203590] other info that might help us debug this:
[ 6.217392] 1 lock held by modprobe/58:
[ 6.225516] #0: ffffffff8169daa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x2e
[ 6.243441]
[ 6.243441] stack backtrace:
[ 6.252662] CPU: 3 PID: 58 Comm: modprobe Not tainted 6.5.0-rc3-next-20230725 #1
[ 6.268319] Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
[ 6.281383] Call Trace:
[ 6.286563] [<ffffffff80006b48>] show_stack+0x2c/0x38
[ 6.297274] [<ffffffff80b49bb2>] dump_stack_lvl+0x60/0x82
[ 6.308723] [<ffffffff80b49be8>] dump_stack+0x14/0x1c
[ 6.319417] [<ffffffff80089d5a>] print_unlock_imbalance_bug+0x1cc/0x1d6
[ 6.333417] [<ffffffff80085e4a>] lock_release+0x236/0x3ae
[ 6.344867] [<ffffffff8007e464>] up_read+0x16/0x26
[ 6.355013] [<ffffffff8000dcfa>] vma_end_read+0x60/0xb8
[ 6.366072] [<ffffffff8000d9ca>] handle_page_fault+0x19e/0x3a4
[ 6.378415] [<ffffffff80b4a18c>] do_page_fault+0x20/0x56
[ 6.389656] [<ffffffff80004434>] ret_from_exception+0x0/0x64
[ 6.401771] ------------[ cut here ]------------
[ 6.411655] DEBUG_RWSEMS_WARN_ON(tmp < 0): count = 0xffffffffffffff00, magic = 0xffffffe7c63c1558, owner = 0x1, curr 0xffffffe7c0add600, list empty
[ 6.439789] WARNING: CPU: 3 PID: 58 at kernel/locking/rwsem.c:1348 __up_read+0x1c2/0x224
[ 6.439840] Modules linked in:
[ 6.439855] CPU: 3 PID: 58 Comm: modprobe Not tainted 6.5.0-rc3-next-20230725 #1
[ 6.439884] Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
[ 6.439896] epc : __up_read+0x1c2/0x224
[ 6.439923] ra : __up_read+0x1c2/0x224
[ 6.439947] epc : ffffffff8007e636 ra : ffffffff8007e636 sp : ffffffc8002b3df0
[ 6.439966] gp : ffffffff818ad0f0 tp : ffffffe7c0add600 t0 : ffffffc8002b3ab8
[ 6.439986] t1 : 0000000000000044 t2 : 5357525f47554245 s0 : ffffffc8002b3e20
[ 6.440004] s1 : ffffffffffffff00 a0 : b32cfaf25517f300 a1 : b32cfaf25517f300
[ 6.440023] a2 : b32cfaf25517f300 a3 : c0000000ffffefff a4 : 00000fff00000000
[ 6.440042] a5 : 0000000000000004 a6 : ffffffff81643e90 a7 : 0000000000000038
[ 6.440060] s2 : ffffffe7c63c1560 s3 : ffffffff81ae3578 s4 : ffffffe7c63c1558
[ 6.440079] s5 : ffffffc8002b3ee0 s6 : 0000000000000254 s7 : ffffffe7c63c05a0
[ 6.440098] s8 : 0000003f97687780 s9 : ffffffffeffffef5 s10: 000000006474e553
[ 6.440117] s11: 0000000000000000 t3 : ffffffff8259430f t4 : ffffffff8259430f
[ 6.440136] t5 : ffffffff82594310 t6 : ffffffff8259430f
[ 6.440151] status: 0000000200000120 badaddr: 0000000000000000 cause: 0000000000000003
[ 6.440169] [<ffffffff8007e636>] __up_read+0x1c2/0x224
[ 6.440201] [<ffffffff8007e46a>] up_read+0x1c/0x26
[ 6.440229] [<ffffffff8000dcfa>] vma_end_read+0x60/0xb8
[ 6.440255] [<ffffffff8000d9ca>] handle_page_fault+0x19e/0x3a4
[ 6.440282] [<ffffffff80b4a18c>] do_page_fault+0x20/0x56
[ 6.440309] [<ffffffff80004434>] ret_from_exception+0x0/0x64
[ 6.440339] irq event stamp: 371
[ 6.440347] hardirqs last enabled at (371): [<ffffffff8000d862>] handle_page_fault+0x36/0x3a4
[ 6.440377] hardirqs last disabled at (370): [<ffffffff80b4aef6>] irqentry_enter+0x16/0x4c
[ 6.440407] softirqs last enabled at (180): [<ffffffff80b56566>] __do_softirq+0x57e/0x66e
[ 6.440453] softirqs last disabled at (173): [<ffffffff8001f288>] __irq_exit_rcu+0x8c/0x14c
[ 6.440494] ---[ end trace 0000000000000000 ]---
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