From: "Michal Suchánek" <msuchanek@suse.de>
To: Harsh Prateek Bora <harshpb@linux.ibm.com>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>,
Venkat Rao Bagalkote <venkat88@linux.ibm.com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
Christian Zigotzky <chzigotzky@xenosoft.de>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
"kvm-ppc@vger.kernel.org" <kvm-ppc@vger.kernel.org>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
"R.T.Dickinson" <rtd2@xtra.co.nz>,
hypexed@yahoo.com.au, mad skateman <madskateman@gmail.com>,
Christian Zigotzky <info@xenosoft.de>,
Amit Machhiwal <amachhiw@linux.ibm.com>,
Gautam Menghani <gautam@linux.ibm.com>
Subject: Re: [Linux PPC] Disable PREEMPT
Date: Mon, 21 Sep 2026 10:06:22 +0200 [thread overview]
Message-ID: <arDlfmpHrN8sbP02@kunlun.suse.cz> (raw)
In-Reply-To: <apl1-rm_-Hb_ROE4@kunlun.suse.cz>
On Thu, Sep 03, 2026 at 03:28:26PM +0200, Michal Suchánek wrote:
> On Thu, Sep 03, 2026 at 06:06:16PM +0530, Harsh Prateek Bora wrote:
> > + Amit, Gautam - since they recently came across a similar regression which
> > is seen with non KVM workload as well.
> > + Venkat - for CI improvement suggestion below.
> >
> > Hi Michal,
> >
> > On 03/09/26 5:55 pm, Michal Suchánek wrote:
>
> > >
> > > There is another problem that Linux 7.2.2 often locks up on boot inside
> > > the guest, and as a result a different kernel is needed in the guest to
> > > reproduce the host crash. This is more recent, linux 6.12 does not have
> > > this problem. Will try some different kernel combinations to see if I
> > > can narrow this down. For this the repro is merely booting the kernel in
> > > the VM, it typically fails early before userspace produces any messages.
>
> This one regressed between 6.19.12
> https://github.com/openSUSE/kernel-source/blob/9f6830f/config/ppc64le/default
> and 7.0.12
> https://github.com/openSUSE/kernel-source/blob/2ebf0bc/config/ppc64le/default
Which is when preempt was enabled.
Very likely preexisting problem that was exposed by enabling preemption
again.
@@ -121,9 +122,7 @@ CONFIG_BPF_LSM=y
CONFIG_PREEMPT_BUILD=y
CONFIG_ARCH_HAS_PREEMPT_LAZY=y
-# CONFIG_PREEMPT_NONE is not set
-CONFIG_PREEMPT_VOLUNTARY=y
-# CONFIG_PREEMPT is not set
+CONFIG_PREEMPT=y
# CONFIG_PREEMPT_LAZY is not set
CONFIG_PREEMPT_COUNT=y
CONFIG_PREEMPTION=y
Thanks
Michal
>
> Thanks
>
> Michal
>
> SLOF **********************************************************************
> QEMU Starting
> Build Date = Aug 13 2026 14:47:36
> FW Version = abuild@OBS release 20230918
> Press "s" to enter Open Firmware.
>
> Populating /vdevice methods
> Populating /vdevice/vty@30000000
> Populating /vdevice/nvram@71000000
> Populating /pci@800000020000000
> Loading Linux 7.0.12-1.g2ebf0bc-default ...
> Loading initial ramdisk ...
> OF stdout device is: /vdevice/vty@30000000
> Preparing to boot Linux version 7.0.12-1.g2ebf0bc-default (geeko@buildhost) (gcc (SUSE Linux) 15.3.0, GNU ld (GNU Binutils; openSUSE Tumbleweed) 2.45.0.20251103-4) #1 SMP PREEMPT_DYNAMIC Mon Jun 15 08:39:32 UTC 2026 (2ebf0bc)
> Detected machine type: 0000000000000101
> command line: BOOT_IMAGE=/boot/vmlinux-7.0.12-1.g2ebf0bc-default root=UUID=304c7f07-efbb-1070-2f27-accd935ec088 rw quiet systemd.show_status=1 security=selinux selinux=1
> Max number of cores passed to firmware: 8192 (NR_CPUS = 8192)
> Calling ibm,client-architecture-support... done
> memory layout at init:
> memory_limit : 0000000000000000 (16 MB aligned)
> alloc_bottom : 00000000066b0000
> alloc_top : 0000000030000000
> alloc_top_hi : 0000003e00000000
> rmo_top : 0000000030000000
> ram_top : 0000003e00000000
> instantiating rtas at 0x000000002fff0000... done
> prom_hold_cpus: skipped
> copying OF device tree...
> Building dt strings...
> Building dt structure...
> Device tree strings 0x00000000066c0000 -> 0x00000000066c0bec
> Device tree struct 0x00000000066d0000 -> 0x00000000066f0000
> Quiescing Open Firmware ...
> Booting Linux via __start() @ 0x0000000000250000 ...
> [ 0.000000][ T0] ERROR: Failed to allocate trace buffer
> [ 0.000000][ T0] ERROR: tracer: failed to allocate ring buffer!
> Linux ppc64le
> #1 SMP PREEMPT_D[ 0.285758][ T673] BUG: Kernel NULL pointer dereference on read at 0x00000010
> [ 0.285877][ T673] Faulting instruction address: 0xc000000000485bd0
> [ 0.285903][ T1] VFS: Dquot-cache hash table entries: 8192 (order 0, 65536 bytes)
> [ 0.285954][ T673] Oops: Kernel access of bad area, sig: 7 [#1]
> [ 0.286133][ T673] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries
> [ 0.286240][ T673] Modules linked in:
> [ 0.286288][ T673] CPU: 15 UID: 0 PID: 673 Comm: kworker/u531:0 Not tainted 7.0.12-1.g2ebf0bc-default #1 PREEMPT(full) openSUSE Tumbleweed (unreleased) cf0846124d7853fab338aeae87203b36cac18419
> [ 0.286527][ T673] Hardware name: IBM pSeries (emulated by qemu) Power11 (architected) 0x820200 0xf000007 of:SLOF,HEAD hv:linux,kvm pSeries
> [ 0.286739][ T673] Workqueue: trace_init_wq tracer_init_tracefs_work_func
> [ 0.286818][ T673] NIP: c000000000485bd0 LR: c000000000448864 CTR: c0000000005a3420
> [ 0.286906][ T673] REGS: c00000000a7a7960 TRAP: 0300 Not tainted (7.0.12-1.g2ebf0bc-default)
> [ 0.287014][ T673] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 44088404 XER: 00000000
> [ 0.287122][ T673] CFAR: c000000000448860 DAR: 0000000000000010 DSISR: 00080000 IRQMASK: 0
> [ 0.287122][ T673] GPR00: c000000000448864 c00000000a7a7c00 c000000001f38100 c000000002a5c098
> [ 0.287122][ T673] GPR04: c0000000017dc5f0 c0000000017dc5e8 000000000000001f 0000000000000064
> [ 0.287122][ T673] GPR08: c0000000017dc628 00000000000005f0 00000000000005e8 0000000084000404
> [ 0.287122][ T673] GPR12: c0000000005a3420 c000003dfff43d80 c0000000018e5600 c0000000018e54f0
> [ 0.287122][ T673] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 0.287122][ T673] GPR20: c0000000013ec418 c0000000013ef6d8 c0000000017dc5a0 c0000000017dc590
> [ 0.287122][ T673] GPR24: c000000001825330 c0000000017dc628 c000000014b52a05 0000000000000000
> [ 0.287122][ T673] GPR28: c0000000017dc5e8 0000000000000000 c0000000017dc5f0 c000000002a5e008
> [ 0.287970][ T673] NIP [c000000000485bd0] __find_event_file+0x70/0x3c0
> [ 0.288046][ T673] LR [c000000000448864] init_tracer_tracefs+0x274/0xc80
> [ 0.288122][ T673] Call Trace:
> [ 0.288167][ T673] [c00000000a7a7c00] [c00000000a7a7c60] 0xc00000000a7a7c60 (unreliable)
> [ 0.288258][ T673] [c00000000a7a7c60] [c000000000448864] init_tracer_tracefs+0x274/0xc80
> [ 0.288348][ T673] [c00000000a7a7dc0] [c00000000203fcf0] tracer_init_tracefs_work_func+0x50/0x320
> [ 0.288452][ T673] [c00000000a7a7e50] [c0000000002620e8] process_one_work+0x1e8/0x5c0
> [ 0.288541][ T673] [c00000000a7a7f10] [c00000000026309c] worker_thread+0x1dc/0x3d0
> [ 0.288630][ T673] [c00000000a7a7f90] [c00000000026fa34] kthread+0x194/0x1b0
> [ 0.288721][ T673] [c00000000a7a7fe0] [c00000000000de58] start_kernel_thread+0x14/0x18
> [ 0.288810][ T673] Code: fb410030 fb810040 fba10048 7cbc2b78 3ba00000 fbc10050 7d194378 7c9e2378 2e2a0fc0 2da90fc0 f8010070 60420000 <e93b0010> 81490058 e8890018 714a0208
> [ 0.289001][ T673] ---[ end trace 0000000000000000 ]---
> [ 0.290718][ T673] pstore: backend (nvram) writing error (-1)
> [ 0.290805][ T673]
> [ 0.290839][ T673] note: kworker/u531:0[673] exited with irqs disabled
> [ 0.304261][ T1] NET: Registered PF_INET protocol family
> [ 0.304602][ T1] IP idents hash table entries: 262144 (order: 5, 2097152 bytes, linear)
> [ 0.315892][ T1] tcp_listen_portaddr_hash hash table entries: 65536 (order: 4, 1048576 bytes, linear)
> [ 0.316104][ T1] Table-perturb hash table entries: 65536 (order: 2, 262144 bytes, linear)
> [ 0.316224][ T1] TCP established hash table entries: 524288 (order: 6, 4194304 bytes, linear)
> [ 0.316873][ T1] TCP bind hash table entries: 65536 (order: 5, 2097152 bytes, linear)
> [ 0.317199][ T1] TCP: Hash tables configured (established 524288 bind 65536)
> [ 0.317748][ T1] MPTCP token hash table entries: 65536 (order: 5, 1572864 bytes, linear)
> [ 0.317970][ T1] UDP hash table entries: 65536 (order: 6, 4194304 bytes, linear)
> [ 0.318402][ T1] UDP-Lite hash table entries: 65536 (order: 6, 4194304 bytes, linear)
> [ 0.319148][ T1] NET: Registered PF_UNIX/PF_LOCAL protocol family
> [ 0.319249][ T1] NET: Registered PF_XDP protocol family
> [ 0.320019][ T1] PCI: CLS 0 bytes, default 128
> [ 0.320281][ T1] rtas_flash: no firmware flash support
> [ 0.320967][ T770] Trying to unpack rootfs image as initramfs...
> [ 0.331385][ T1] Initialise system trusted keyrings
> [ 0.331739][ T1] Key type blacklist registered
> [ 0.332191][ T1] workingset: timestamp_bits=38 max_order=22 bucket_order=0
> [ 0.333804][ T1] integrity: Platform Keyring initialized
> [ 0.333875][ T1] integrity: Machine keyring initialized
> [ 0.333935][ T1] Allocating IMA blacklist keyring.
> [ 0.343039][ T1] Key type asymmetric registered
> [ 0.343109][ T1] Asymmetric key parser 'x509' registered
> [ 0.344215][ T1] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 246)
> [ 0.344623][ T1] io scheduler mq-deadline registered
> [ 0.344688][ T1] io scheduler kyber registered
> [ 0.344800][ T1] io scheduler bfq registered
> [ 0.380554][ T1] ledtrig-cpu: registered to indicate activity on CPUs
> [ 0.380794][ T1] virtio-pci 0000:00:01.0: enabling device (0100 -> 0103)
> [ 0.382384][ T1] virtio-pci 0000:00:01.0: ibm,query-pe-dma-windows(2026) 800 8000000 20000000 returned 0, lb=2000000000 ps=107 wn=1
> [ 0.383175][ T1] virtio-pci 0000:00:01.0: ibm,create-pe-dma-window(2027) 800 8000000 20000000 18 26 returned 0 (liobn = 0x80000001 starting addr = 8000000 0)
> [ 0.386395][ T1] virtio-pci 0000:00:01.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.386509][ T1] virtio-pci 0000:00:01.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.386621][ T1] virtio-pci 0000:00:01.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.386723][ T1] virtio-pci 0000:00:01.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.388040][ T1] virtio-pci 0000:00:03.0: enabling device (0100 -> 0103)
> [ 0.390005][ T1] virtio-pci 0000:00:03.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.390111][ T1] virtio-pci 0000:00:03.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.390216][ T1] virtio-pci 0000:00:03.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.390316][ T1] virtio-pci 0000:00:03.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.392116][ T1] virtio-pci 0000:00:04.0: enabling device (0100 -> 0103)
> [ 0.394076][ T1] virtio-pci 0000:00:04.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.394184][ T1] virtio-pci 0000:00:04.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.394288][ T1] virtio-pci 0000:00:04.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.394389][ T1] virtio-pci 0000:00:04.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.395729][ T1] virtio-pci 0000:00:05.0: enabling device (0100 -> 0103)
> [ 0.397705][ T1] virtio-pci 0000:00:05.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.397814][ T1] virtio-pci 0000:00:05.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.397919][ T1] virtio-pci 0000:00:05.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.398024][ T1] virtio-pci 0000:00:05.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.399426][ T1] virtio-pci 0000:00:06.0: enabling device (0100 -> 0103)
> [ 0.401288][ T1] virtio-pci 0000:00:06.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.401396][ T1] virtio-pci 0000:00:06.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.401502][ T1] virtio-pci 0000:00:06.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.401604][ T1] virtio-pci 0000:00:06.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.403644][ T1] virtio-pci 0000:00:07.0: enabling device (0100 -> 0103)
> [ 0.405723][ T1] virtio-pci 0000:00:07.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.405830][ T1] virtio-pci 0000:00:07.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.405936][ T1] virtio-pci 0000:00:07.0: lsa_required: 0, lsa_enabled: 0, direct mapping: 1
> [ 0.406044][ T1] virtio-pci 0000:00:07.0: iommu: 64-bit OK but direct DMA is limited by 800004000000000
> [ 0.409460][ T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> [ 0.427929][ T770] Freeing initrd memory: 21120K
> [ 0.431965][ T1] Non-volatile memory driver v1.3
> [ 0.432069][ T1] pseries_rng: Registering IBM pSeries RNG driver
> [ 0.433884][ T1] mousedev: PS/2 mouse device common for all mice
> [ 0.435769][ T1] pseries_idle_driver registered
> [ 0.435912][ T1] hid: raw HID events driver (C) Jiri Kosina
> [ 0.436062][ T1] drop_monitor: Initializing network drop monitor service
> [ 0.436412][ T1] NET: Registered PF_INET6 protocol family
> [ 0.437731][ T1] Segment Routing with IPv6
> [ 0.437819][ T1] RPL Segment Routing with IPv6
> [ 0.437897][ T1] In-situ OAM (IOAM) with IPv6
> [ 0.438002][ T1] PFKEY is deprecated and scheduled to be removed in 2027, please contact the netdev mailing list
> [ 0.438125][ T1] NET: Registered PF_KEY protocol family
> [ 0.438508][ T1] secvar-sysfs: Failed to retrieve secvar operations
> [ 0.441215][ T1] registered taskstats version 1
> [ 0.464617][ T1] Loading compiled-in X.509 certificates
> [ 0.481670][ T1] Loaded X.509 cert 'home:tiwai OBS Project: 466e10c6490242bdd3a9985914c1906197b53a81'
> [ 0.487739][ T1] Demotion targets for Node 0: null
> [ 0.487834][ T1] page_owner is disabled
> [ 0.518088][ T1] Key type .fscrypt registered
> [ 0.518163][ T1] Key type fscrypt-provisioning registered
> [ 0.518473][ T1] Key type big_key registered
> [ 0.536738][ T1] Key type encrypted registered
> [ 0.536916][ T1] Secure boot mode disabled
> [ 0.536994][ T1] ima: No TPM chip found, activating TPM-bypass!
> [ 0.537070][ T1] Loading compiled-in module X.509 certificates
> [ 0.537347][ T1] Loaded X.509 cert 'home:tiwai OBS Project: 466e10c6490242bdd3a9985914c1906197b53a81'
> [ 0.537451][ T1] ima: Allocated hash algorithm: sha256
> [ 0.538132][ T1] Secure boot mode disabled
> [ 0.538236][ T1] Trusted boot mode disabled
> [ 0.538303][ T1] ima: No architecture policies found
> [ 0.538448][ T1] evm: Initialising EVM extended attributes:
> [ 0.538523][ T1] evm: security.selinux
> [ 0.538569][ T1] evm: security.SMACK64 (disabled)
> [ 0.538629][ T1] evm: security.SMACK64EXEC (disabled)
> [ 0.538689][ T1] evm: security.SMACK64TRANSMUTE (disabled)
> [ 0.538762][ T1] evm: security.SMACK64MMAP (disabled)
> [ 0.538822][ T1] evm: security.apparmor
> [ 0.538868][ T1] evm: security.ima
> [ 0.538915][ T1] evm: security.capability
> [ 0.538983][ T1] evm: HMAC attrs: 0x1
> [ 0.553344][ T1] SED: plpks not available
>
>
>
>
next prev parent reply other threads:[~2026-09-21 8:06 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-14 14:02 [Linux PPC] KVM PR and KVM HV do not work if the kernel was compiled with PREEMPT Christian Zigotzky
2026-02-17 5:02 ` Shrikanth Hegde
2026-02-17 8:52 ` Christian Zigotzky
2026-02-17 9:03 ` Shrikanth Hegde
2026-02-17 9:44 ` Christian Zigotzky
2026-02-17 10:17 ` Madhavan Srinivasan
2026-02-17 10:26 ` Christian Zigotzky
2026-02-17 11:34 ` Shrikanth Hegde
2026-02-21 5:30 ` Christian Zigotzky
2026-02-23 3:45 ` Shrikanth Hegde
2026-02-23 16:48 ` [Linux PPC] 7.0-rc1: e500_mmu.c:923:26: error: assignment to 'struct tlbe_priv *' from incompatible pointer type 'struct tlbe_ref *' Christian Zigotzky
2026-02-23 18:07 ` Christophe Leroy (CS GROUP)
2026-02-23 19:38 ` Christophe Leroy (CS GROUP)
2026-02-23 22:40 ` Kees Cook
2026-02-24 6:30 ` Christian Zigotzky
2026-02-24 7:18 ` Christophe Leroy (CS GROUP)
2026-02-25 5:54 ` [Linux PPC] Disable PREEMPT Christian Zigotzky
2026-02-25 6:23 ` Shrikanth Hegde
2026-02-25 7:16 ` Christophe Leroy (CS GROUP)
2026-02-25 11:36 ` Peter Zijlstra
2026-02-26 5:37 ` Christian Zigotzky
2026-02-26 13:24 ` Christophe Leroy (CS GROUP)
2026-09-03 9:53 ` Michal Suchánek
2026-09-03 10:56 ` Shrikanth Hegde
2026-09-03 11:25 ` Michal Suchánek
2026-09-03 11:31 ` Shrikanth Hegde
2026-09-03 11:40 ` Michal Suchánek
2026-09-03 12:04 ` Shrikanth Hegde
2026-09-03 12:25 ` Michal Suchánek
2026-09-03 12:36 ` Harsh Prateek Bora
2026-09-03 12:55 ` Michal Suchánek
2026-09-03 15:17 ` Amit Machhiwal
2026-09-03 13:28 ` Michal Suchánek
2026-09-04 7:39 ` Michal Suchánek
2026-09-21 8:06 ` Michal Suchánek [this message]
2026-09-21 16:46 ` Michal Suchánek
2026-09-21 17:20 ` Shrikanth Hegde
2026-09-22 8:22 ` Michal Suchánek
2026-09-03 17:22 ` Shrikanth Hegde
2026-09-04 7:35 ` Michal Suchánek
2026-09-04 9:04 ` Shrikanth Hegde
2026-09-10 8:59 ` Michal Suchánek
2026-09-10 10:41 ` Shrikanth Hegde
2026-09-10 11:29 ` Michal Suchánek
2026-09-10 12:16 ` Michal Suchánek
2026-09-11 17:09 ` Shrikanth Hegde
2026-09-14 10:58 ` Michal Suchánek
2026-09-15 5:47 ` Narayana Murty N
2026-09-15 7:35 ` Michal Suchánek
2026-09-15 9:08 ` Shrikanth Hegde
2026-09-16 18:11 ` Shrikanth Hegde
2026-09-17 10:14 ` Michal Suchánek
2026-09-17 10:28 ` Shrikanth Hegde
2026-09-17 13:12 ` Michal Suchánek
2026-09-17 14:15 ` Shrikanth Hegde
2026-09-18 2:39 ` Christian Zigotzky
2026-09-18 7:10 ` Michal Suchánek
2026-09-20 11:49 ` Christian Zigotzky
2026-09-20 13:04 ` Christian Zigotzky
2026-09-21 5:12 ` Shrikanth Hegde
2026-09-23 5:09 ` Christian Zigotzky
2026-09-23 5:13 ` Shrikanth Hegde
2026-09-23 16:01 ` Christian Zigotzky
2026-09-23 18:42 ` Shrikanth Hegde
2026-09-24 17:47 ` Christian Zigotzky
2026-09-25 6:40 ` Shrikanth Hegde
2026-09-18 9:26 ` Shrikanth Hegde
2026-09-18 11:52 ` Michal Suchánek
2026-09-04 8:55 ` Christian Zigotzky
2026-09-04 9:20 ` Christian Zigotzky
2026-09-04 9:24 ` Shrikanth Hegde
2026-09-04 9:34 ` Christian Zigotzky
2026-09-05 13:07 ` Christian Zigotzky
2026-09-07 8:50 ` Michal Suchánek
2026-09-07 11:32 ` Christian Zigotzky
2026-09-10 8:54 ` Michal Suchánek
2026-09-10 10:31 ` Michal Suchánek
2026-09-10 11:31 ` Michal Suchánek
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