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bh=+GESfE5Q3/UL7GKchlOPBuB23BDDa/xreTR02cE2ves=; b=SiSOJQ3q79z4Gs7LAvQuAqNnnUv5KHDSWxZogffa7jpxCjZIX0kRp1P35EzOqS8onK7f9R bnAU3fEeMCXgY9EA3G4CrFqWe+UVC//kuf3S8UUwPV3826iPkQEYbKcmPnSG5lIObzX27D TCElnJgsnS3PKTuz057h1UmsT414pzY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1788440114; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+GESfE5Q3/UL7GKchlOPBuB23BDDa/xreTR02cE2ves=; b=tA6EmBVQZv3xP3fsTgARFi6IqdoziL17mKz5BOZ4o+8gazKkBaIG5RLEjL7bLP697NcwaS B+nKp9Zg1DGlVVAg== Date: Thu, 3 Sep 2026 14:55:13 +0200 From: Michal =?iso-8859-1?Q?Such=E1nek?= To: Harsh Prateek Bora Cc: Shrikanth Hegde , Venkat Rao Bagalkote , "Christophe Leroy (CS GROUP)" , Christian Zigotzky , linuxppc-dev , "kvm-ppc@vger.kernel.org" , Madhavan Srinivasan , Peter Zijlstra , "R.T.Dickinson" , hypexed@yahoo.com.au, mad skateman , Christian Zigotzky , Amit Machhiwal , Gautam Menghani Subject: Re: [Linux PPC] Disable PREEMPT Message-ID: References: <34112e67-85a5-a380-a42b-24c6562d65be@xenosoft.de> <8c6f2510-1dc5-4c45-9288-6b9c8f9b6b24@kernel.org> <9a58d944-405c-4519-852e-8fa04c22c2db@linux.ibm.com> <1d83264f-8eda-4321-9200-f12897e38cda@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: add header X-Rspamd-Queue-Id: 8C59921AB9 X-Spamd-Result: default: False [12.67 / 50.00]; SPAM_FLAG(5.00)[]; NEURAL_SPAM_LONG(3.50)[1.000]; BAYES_HAM(-3.00)[100.00%]; HFILTER_HOSTNAME_UNKNOWN(2.50)[]; RDNS_NONE(2.00)[]; ONCE_RECEIVED(1.20)[]; HFILTER_HELO_IP_A(1.00)[kunlun.suse.cz]; R_MIXED_CHARSET(0.63)[subject]; HFILTER_HELO_NORES_A_OR_MX(0.30)[kunlun.suse.cz]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.15)[-0.730]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RCPT_COUNT_TWELVE(0.00)[15]; MIME_TRACE(0.00)[0:+]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b306:2000::2:from]; TO_DN_EQ_ADDR_SOME(0.00)[]; ARC_NA(0.00)[]; FREEMAIL_ENVRCPT(0.00)[xtra.co.nz,yahoo.com.au,gmail.com]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_ZERO(0.00)[0]; DKIM_TRACE(0.00)[suse.de:+]; MISSING_XM_UA(0.00)[]; FREEMAIL_CC(0.00)[linux.ibm.com,kernel.org,xenosoft.de,lists.ozlabs.org,vger.kernel.org,infradead.org,xtra.co.nz,yahoo.com.au,gmail.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[kunlun.suse.cz:mid,kunlun.suse.cz:helo,suse.de:dkim] X-Spamd-Bar: ++++++++++++ X-Spam: Yes 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: > > On Thu, Sep 03, 2026 at 05:34:31PM +0530, Shrikanth Hegde wrote: > > > Hi Michal. > > > > > > On 9/3/26 5:10 PM, Michal Suchánek wrote: > > > > On Thu, Sep 03, 2026 at 05:01:13PM +0530, Shrikanth Hegde wrote: > > > > > > > > > > > > > > > > > > > > > > > > This is not the latest kernel so it might have been fixed in the > > > > > > > > meantime for the platform in question. Will need to check that. > > > > > > > > > > > > > > > > > > > > > > If possible run against current upstream and share the results. > > > > > > > > > > > > https://github.com/openSUSE/kernel-source/blob/6824496d1801f73def615dca8794202eeb7b0d86/config/ppc64le/default > > > > > > > > > > > > [ 472.091531][ T6181] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: kvmhv_run_single_vcpu+0x19d4/0x1b50 [kvm_hv] > > > > > > [ 472.091598][ T6181] CPU: 29 UID: 107 PID: 6181 Comm: CPU 112/KVM Not tainted 7.2.2-5.g6824496-default #1 PREEMPT(full) openSUSE Tumbleweed (unreleased) 61871a5f06863b4006f5ef27cd9f18e8a7a2edad > > > > > > [ 472.091612][ T6181] Hardware name: IBM,9824-42A Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.20 (OB1110_130) hv:phyp pSeries > > > > > > [ 472.091624][ T6181] Call Trace: > > > > > > [ 472.091630][ T6181] [c00000000fdfb680] [c00000000134ce90] dump_stack_lvl+0x84/0xc0 (unreliable) > > > > > > [ 472.091653][ T6181] [c00000000fdfb6b0] [c00000000022e7c8] vpanic+0x324/0x5e4 > > > > > > [ 472.091666][ T6181] [c00000000fdfb760] [c00000000022eac4] do_panic_on_target_cpu+0x0/0x2c > > > > > > [ 472.091677][ T6181] [c00000000fdfb780] [c0000000013c1ff8] __stack_chk_fail+0x48/0x60 > > > > > > [ 472.091689][ T6181] [c00000000fdfb7f0] [c00800001aae219c] kvmhv_run_single_vcpu+0x19d4/0x1b50 [kvm_hv] > > > > > > [ 472.091712][ T6181] [c00000000fdfb940] [c00800001aae24b4] kvmppc_vcpu_run_hv+0x19c/0x12f0 [kvm_hv] > > > > > > [ 472.091732][ T6181] [c00000000fdfba10] [c00800001aeeed18] kvmppc_vcpu_run+0x30/0x48 [kvm] > > > > > > [ 472.091779][ T6181] [c00000000fdfba30] [c00800001aee9ef4] kvm_arch_vcpu_ioctl_run+0x35c/0x4a0 [kvm] > > > > > > [ 472.091813][ T6181] [c00000000fdfbac0] [c00800001aedaac4] kvm_vcpu_ioctl+0x1ac/0xad8 [kvm] > > > > > > [ 472.091844][ T6181] [c00000000fdfbca0] [c0000000007f1244] sys_ioctl+0x374/0x1060 > > > > > > [ 472.091857][ T6181] [c00000000fdfbdb0] [c00000000002f7f8] system_call_exception+0x188/0x430 > > > > > > [ 472.091871][ T6181] [c00000000fdfbe50] [c00000000000cfdc] system_call_vectored_common+0x15c/0x2ec > > > > > > [ 472.091886][ T6181] ---- interrupt: 3000 at 0x7fffb5565fac > > > > > > [ 472.091896][ T6181] NIP: 00007fffb5565fac LR: 00007fffb5565fac CTR: 0000000000000000 > > > > > > [ 472.091904][ T6181] REGS: c00000000fdfbe80 TRAP: 3000 Not tainted (7.2.2-5.g6824496-default) > > > > > > [ 472.091911][ T6181] MSR: 800000000280f033 CR: 42044402 XER: 00000000 > > > > > > [ 472.091938][ T6181] IRQMASK: 0 > > > > > > [ 472.091938][ T6181] GPR00: 0000000000000036 00007fbfa77ed7a0 00007fffb5677100 00000000000000fa > > > > > > [ 472.091938][ T6181] GPR04: 000000002000ae80 0000000000000000 0000000000000000 0000000000000000 > > > > > > [ 472.091938][ T6181] GPR08: 00000000000000fa 0000000000000000 0000000000000000 0000000000000000 > > > > > > [ 472.091938][ T6181] GPR12: 0000000000000000 00007fbfa77f5ec0 000000014676f000 00007fbfa77ee7c0 > > > > > > [ 472.091938][ T6181] GPR16: 000000014674e8d0 00007fbfa77eeec0 00007fbfa77eeec0 fffffffffffffff7 > > > > > > [ 472.091938][ T6181] GPR20: 00007fffb71210d0 0000000000000001 00007fbfa77eeec0 0000000000000000 > > > > > > [ 472.091938][ T6181] GPR24: 00007fbfa77ed8e8 0000000105971428 000000002000ae80 0000000105f77a70 > > > > > > [ 472.091938][ T6181] GPR28: 0000000000000000 0000000000000000 000000002000ae80 000000014674f000 > > > > > > [ 472.092020][ T6181] NIP [00007fffb5565fac] 0x7fffb5565fac > > > > > > [ 472.092027][ T6181] LR [00007fffb5565fac] 0x7fffb5565fac > > > > > > [ 472.092033][ T6181] ---- interrupt: 3000 > > > > > > [ 472.098256][ T6181] pstore: backend (nvram) writing error (-1) > > > > > > > > > > > > This is the host, cannot run the kernel as guest because it fails to boot most > > > > > > of the time inside KVM. > > > > > > > > > > > > > > > > Will look into. btw the patch shared i.e below patch fixes the boot hanf issue? > > > > > > > > > > https://lore.kernel.org/all/1d79ec6f-ce7f-4432-80e0-a54fa1668642@linux.ibm.com/ > > > > > > > > > > I see code has changed a bit. So this patch is not correct anymore. > > > Sorry, i should have checked. > > > > > > > I would not bet on that. It looks like host side patch, and the problem > > > > is with booting 7.2.2 as guest. Some 6.12 frankenkernel can be booted on > > > > the same host, and used to produce the crash above by running a kernel > > > > build inside the guest. > > > > > > > > > > I didn't get what you are saying. Could you see if it regression only in 7.2? > > > Does 7.1 works fine? If it is regression could you see if it is bisectable? > > > Also, could you share the repro steps? > > > > The repro steps are: on a mid-size LPAR (120 CPU threads, 256G RAM) > > create a KVM VM that uses all host resources. Run kernel build inside > > KVM VM, using all CPUs. In about a minute the host crashes with the > > above a or similar trace. I don't have any kernel version with aggressive > > preemption enabled that does not suffer from this problem. > > Looks like seen under heavy workloads when you say "KVM VM that uses all > host rsources". Could you please confirm if the issue is seen with any other > heavy workload also which consumes all host resources? I do not think we > recently had any PPC KVM specific changes which would cause this. Also, if > it's a regression, git bisect should point out the real culprit. It's a regression from switching to PREEMPT_LAZY (from PREEMPT_VOLUNTARY). Very likely the code was buggy to start with but because less aggressive preemption model was used the bug was never triggered. I cannot reproduce this under load without KVM. The other problem that is much harder to reproduce is machine locking up while idling. A dump then also shows stack corruption with completely but different stack trace, no KVM involved in that one. Did not see this with recent mainline yet. I do get a problem with 7.2.2 building a kernel outside of kVM but that's probably because it's missing some of the recent entry fixes: [ 5451.821931] [ T77619] as[77619]: segfault (11) at 3abd0 nip 7fff8fe56434 lr 7fff8fe55348 code 1 in ld64.so.2[36434,7fff8fe20000+60000] [ 5451.821967] [ T77619] as[77619]: code: 60000000 60000000 60000000 f9490008 f9490010 39290020 f949fff8 f9490000 [ 5451.821973] [ T77619] as[77619]: code: 4200ffec 89210376 3d42ffff 394a7ea0 7d081050 f9410030 f9010020 [ 5454.239768] [ T78922] awk[78922]: segfault (11) at 3abd0 nip 7fff8c386434 lr 7fff8c385348 code 1 in ld64.so.2[36434,7fff8c350000+60000] [ 5454.239809] [ T78922] awk[78922]: code: 60000000 60000000 60000000 f9490008 f9490010 39290020 f949fff8 f9490000 [ 5454.239815] [ T78922] awk[78922]: code: 4200ffec 89210376 3d42ffff 394a7ea0 7d081050 f9410030 f9010020 [ 5465.056566] [ T85518] sh[85518]: segfault (11) at 3abd0 nip 7fffb79a6434 lr 7fffb79a5348 code 1 in ld64.so.2[36434,7fffb7970000+60000] [ 5465.056611] [ T85518] sh[85518]: code: 60000000 60000000 60000000 f9490008 f9490010 39290020 f949fff8 f9490000 [ 5465.056616] [ T85518] sh[85518]: code: 4200ffec 89210376 3d42ffff 394a7ea0 7d081050 f9410030 f9010020 [ 5474.995476] [ T91034] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: sys_ioctl+0xfe0/0x1060 [ 5474.995495] [ T91037] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: vprintk_store+0x6a4/0x6c0 [ 5474.995508] [ T91037] ------------[ cut here ]------------ [ 5474.995513] [ T91037] kernel BUG at [regs_irqs_disabled(regs)] arch/powerpc/include/asm/entry-common.h:401! [ 5474.995521] [ T91037] Oops: Exception in kernel mode, sig: 5 [#1] [ 5474.995524] [ T91037] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries [ 5474.995528] [ T91037] Modules linked in: rpadlpar_io rpaphp kvm_hv kvm mptcp_diag xsk_diag tcp_diag udp_diag raw_diag inet_diag unix_diag af_packet_diag netlink_diag xt_conntrack xt_MASQUERADE xfrm_user xt_set ip_set xt_addrtype nft_compat nf_conntrack_netbios_ns nf_conntrack_broadcast nft_masq nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct bonding tls nft_chain_nat nf_nat nf_conntrack tun nf_defrag_ipv6 nf_defrag_ipv4 rfkill af_packet binfmt_misc xfs aes_gcm_p10_crypto ibmveth crypto_simd cryptd xts vmx_crypto rtc_generic fuse nvme_fabrics ip_tables x_tables ibmvscsi scsi_transport_srp sd_mod scsi_dh_emc scsi_dh_rdac scsi_dh_alua sg scsi_mod scsi_common nvme nvme_core nvme_keyring pseries_wdt nvme_auth btrfs xor libblake2b raid6_pq dm_mirror dm_region_hash dm_log dm_mod br_netfilter bridge stp llc nf_tables [ 5474.995641] [ T91037] CPU: 110 UID: 399 PID: 91037 Comm: cc1 Not tainted 7.2.2-5.g6824496-default #1 PREEMPT(full) openSUSE Tumbleweed (unreleased) 61871a5f06863b4006f5ef27cd9f18e8a7a2edad [ 5474.995649] [ T91037] Hardware name: IBM,9824-42A Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.20 (OB1110_130) hv:phyp pSeries [ 5474.995653] [ T91037] NIP: c0000000013c2114 LR: c000000000148c88 CTR: c000000000008e40 [ 5474.995656] [ T91037] REGS: c000001f965d3b50 TRAP: 0700 Not tainted (7.2.2-5.g6824496-default) [ 5474.995660] [ T91037] MSR: 8000000000029033 CR: 42004208 XER: 20040145 [ 5474.995670] [ T91037] CFAR: c0000000013c20b4 IRQMASK: 3 GPR00: c00000000000904c c000001f965d3df0 c00000000205ad00 c000001f965d3e80 GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR08: 0000000000000000 0000000000000001 0000000000004000 0000000053474552 GPR12: 0000000000000000 c000003ffef56300 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR28: 0000000000000000 0000000000000000 0000000000000000 c000001f965d3e80 [ 5474.995708] [ T91037] NIP [c0000000013c2114] irqentry_enter+0x74/0x1a0 [ 5474.995719] [ T91037] LR [c000000000148c88] do_page_fault+0x68/0x140 [ 5474.995727] [ T91037] Call Trace: [ 5474.995731] [ T91037] [c000001f965d3e10] [c000001f965d3e50] 0xc000001f965d3e50 [ 5474.995739] [ T91037] [c000001f965d3e50] [c00000000000904c] instruction_access_common_virt+0x20c/0x210 [ 5474.995751] [ T91037] ---- interrupt: 400 at 0x1043f158 [ 5474.995754] [ T91037] NIP: 000000001043f158 LR: 00000000101218e0 CTR: 00007fff7aef4f00 [ 5474.995756] [ T91037] REGS: c000001f965d3e80 TRAP: 0400 Not tainted (7.2.2-5.g6824496-default) [ 5474.995759] [ T91037] MSR: 800000004280f033 CR: 82004208 XER: 20040145 [ 5474.995770] [ T91037] CFAR: 00000000101218dc IRQMASK: 1 GPR00: 00000000101218cc 00007ffffd284ce0 0000000011de7a00 0000000012c2c370 GPR04: 0000000000000001 0000000000000000 0000000000000001 0000000000000000 GPR08: 00007fff7b070d60 0000000000000000 0000000012c2c380 0000000000004000 GPR12: 00007fff7aef4f00 00007fff7ba8da00 0000000000000000 0000000000000000 GPR16: 0000000000000000 00007ffffd28c2ac 0000000000000000 0000000000000001 GPR20: 0000000000000197 0000000000c03cff 0000000011e0d210 0000000000000008 GPR24: 0000000000000000 00007ffffd284f58 0000000000000000 0000000000000000 GPR28: 0000000000000001 00007ffffd28c2ac 0000000000000000 0000000000000197 [ 5474.995809] [ T91037] NIP [000000001043f158] 0x1043f158 [ 5474.995812] [ T91037] LR [00000000101218e0] 0x101218e0 [ 5474.995814] [ T91037] ---- interrupt: 400 [ 5474.995816] [ T91037] Code: f8010030 4af8b211 60000000 e8010030 7c0803a6 4bffffd4 60420000 7929ffe2 69290001 0b090000 e9230138 792907e0 <0b090000> 4800001c e9230140 792907a4 [ 5474.995835] [ T91037] ---[ end trace 0000000000000000 ]--- [ 5492.821144] [ C110] watchdog: CPU 110 Hard LOCKUP [ 5492.821159] [ C110] watchdog: CPU 110 TB:3408898268781396, last heartbeat TB:3408888039246087 (19979ms ago) [ 5492.821162] [ C110] Modules linked in: rpadlpar_io rpaphp kvm_hv kvm mptcp_diag xsk_diag tcp_diag udp_diag raw_diag inet_diag unix_diag af_packet_diag netlink_diag xt_conntrack xt_MASQUERADE xfrm_user xt_set ip_set xt_addrtype nft_compat nf_conntrack_netbios_ns nf_conntrack_broadcast nft_masq nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct bonding tls nft_chain_nat nf_nat nf_conntrack tun nf_defrag_ipv6 nf_defrag_ipv4 rfkill af_packet binfmt_misc xfs aes_gcm_p10_crypto ibmveth crypto_simd cryptd xts vmx_crypto rtc_generic fuse nvme_fabrics ip_tables x_tables ibmvscsi scsi_transport_srp sd_mod scsi_dh_emc scsi_dh_rdac scsi_dh_alua sg scsi_mod scsi_common nvme nvme_core nvme_keyring pseries_wdt nvme_auth btrfs xor libblake2b raid6_pq dm_mirror dm_region_hash dm_log dm_mod br_netfilter bridge stp llc nf_tables [ 5492.821225] [ C110] CPU: 110 UID: 399 PID: 91037 Comm: cc1 Tainted: G D 7.2.2-5.g6824496-default #1 PREEMPT(full) openSUSE Tumbleweed (unreleased) 61871a5f06863b4006f5ef27cd9f18e8a7a2edad [ 5492.821234] [ C110] Tainted: [D]=DIE [ 5492.821235] [ C110] Hardware name: IBM,9824-42A Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.20 (OB1110_130) hv:phyp pSeries [ 5492.821237] [ C110] NIP: c0000000013d2c90 LR: c0000000013d4564 CTR: c000000000919460 [ 5492.821241] [ C110] REGS: c000003ffeb93d60 TRAP: 0100 Tainted: G D (7.2.2-5.g6824496-default) [ 5492.821244] [ C110] MSR: 8000000000081033 CR: 44004204 XER: 20040145 [ 5492.821252] [ C110] CFAR: 000000000000011c IRQMASK: 3 GPR00: c0000000009194f0 c000001f965d3730 c00000000205ad00 c0000000037b6510 GPR04: c000001f965d39d8 00000000000000dd fffffffffffe0000 0000000000010000 GPR08: 0000000000000001 0000000000000001 000000000fe67ee1 0000000000004000 GPR12: c000000000919460 c000003ffef56300 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: 0000000000002800 c0000000018c5670 c000001f965d39d8 0000003ff1ae0000 GPR28: 0000000000de0000 c0000000032bbe80 c000003ff4d9be80 c0000000037b6510 [ 5492.821283] [ C110] NIP [c0000000013d2c90] queued_spin_lock_slowpath+0x160/0x19a0 [ 5492.821296] [ C110] LR [c0000000013d4564] _raw_spin_lock_irqsave+0x94/0xc0 [ 5492.821299] [ C110] Call Trace: [ 5492.821302] [ C110] [c000001f965d3830] [0000000000000263] 0x263 [ 5492.821309] [ C110] [c000001f965d3860] [c0000000009194f0] pstore_dump+0x90/0x430 [ 5492.821317] [ C110] [c000001f965d39b0] [c00000000031ff40] kmsg_dump_desc+0xb0/0x100 [ 5492.821325] [ C110] [c000001f965d3a10] [c00000000022e2a4] oops_exit+0x54/0x70 [ 5492.821331] [ C110] [c000001f965d3a70] [c00000000002760c] oops_end+0x6c/0x1a0 [ 5492.821340] [ C110] [c000001f965d3af0] [c00000000002a61c] program_check_exception+0x7c/0xe0 [ 5492.821344] [ C110] [c000001f965d3b20] [c000000000009b2c] program_check_common_virt+0x3bc/0x3c0 [ 5492.821352] [ C110] ---- interrupt: 700 at irqentry_enter+0x74/0x1a0 [ 5492.821358] [ C110] NIP: c0000000013c2114 LR: c000000000148c88 CTR: c000000000008e40 [ 5492.821361] [ C110] REGS: c000001f965d3b50 TRAP: 0700 Tainted: G D (7.2.2-5.g6824496-default) [ 5492.821363] [ C110] MSR: 8000000000029033 CR: 42004208 XER: 20040145 [ 5492.821370] [ C110] CFAR: c0000000013c20b4 IRQMASK: 3 GPR00: c00000000000904c c000001f965d3df0 c00000000205ad00 c000001f965d3e80 GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR08: 0000000000000000 0000000000000001 0000000000004000 0000000053474552 GPR12: 0000000000000000 c000003ffef56300 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR28: 0000000000000000 0000000000000000 0000000000000000 c000001f965d3e80 [ 5492.821399] [ C110] NIP [c0000000013c2114] irqentry_enter+0x74/0x1a0 [ 5492.821403] [ C110] LR [c000000000148c88] do_page_fault+0x68/0x140 [ 5492.821409] [ C110] ---- interrupt: 700 [ 5492.821410] [ C110] [c000001f965d3df0] [0000000000000000] 0x0 (unreliable) [ 5492.821414] [ C110] [c000001f965d3e10] [c000001f965d3e50] 0xc000001f965d3e50 [ 5492.821416] [ C110] [c000001f965d3e50] [c00000000000904c] instruction_access_common_virt+0x20c/0x210 [ 5492.821421] [ C110] ---- interrupt: 400 at 0x1043f158 [ 5492.821423] [ C110] NIP: 000000001043f158 LR: 00000000101218e0 CTR: 00007fff7aef4f00 [ 5492.821425] [ C110] REGS: c000001f965d3e80 TRAP: 0400 Tainted: G D (7.2.2-5.g6824496-default) [ 5492.821428] [ C110] MSR: 800000004000f033 CR: 82004208 XER: 20040145 [ 5492.821436] [ C110] CFAR: 00000000101218dc IRQMASK: 1 GPR00: 00000000101218cc 00007ffffd284ce0 0000000011de7a00 0000000012c2c370 GPR04: 0000000000000001 0000000000000000 0000000000000001 0000000000000000 GPR08: 00007fff7b070d60 0000000000000000 0000000012c2c380 0000000000004000 GPR12: 00007fff7aef4f00 00007fff7ba8da00 0000000000000000 0000000000000000 GPR16: 0000000000000000 00007ffffd28c2ac 0000000000000000 0000000000000001 GPR20: 0000000000000197 0000000000c03cff 0000000011e0d210 0000000000000008 GPR24: 0000000000000000 00007ffffd284f58 0000000000000000 0000000000000000 GPR28: 0000000000000001 00007ffffd28c2ac 0000000000000000 0000000000000197 [ 5492.821464] [ C110] NIP [000000001043f158] 0x1043f158 [ 5492.821466] [ C110] LR [00000000101218e0] 0x101218e0 [ 5492.821468] [ C110] ---- interrupt: 400 [ 5492.821470] [ C110] Code: 7c085040 41810e8c 39400000 39000000 3cc0fffe 60000000 813f0000 71290001 41820050 3ce00001 60000000 60420000 <7c40003c> 71090001 394a0001 40820028 Thanks Michal