Problem still occurs even after memory balancing has been disabled. On random resumes:
[37968.267047] audit: type=1104 audit(1581552250.086:231): pid=13012 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:setcred grantors=pam_rootok acct="root" exe="/usr/lib/qubes/qrexec-agent" hostname=? addr=? terminal=? res=success' [37973.300468] page:ffffea00039be440 count:0 mapcount:-128 mapping:0000000000000000 index:0x1 [37973.300492] flags: 0xfffe000000000() [37973.300502] raw: 000fffe000000000 ffffea00031be488 ffffea00021ebe88 0000000000000000 [37973.300518] raw: 0000000000000001 0000000000000000 00000000ffffff7f 0000000000000000 [37973.300534] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [37973.300552] ------------[ cut here ]------------ [37973.300563] kernel BUG at /home/user/rpmbuild/BUILD/kernel-4.19.94/linux-4.19.94/include/linux/mm.h:519! [37973.300585] invalid opcode: 0000 [#1] SMP PTI [37973.300597] CPU: 1 PID: 13048 Comm: DOM Worker Tainted: G O 4.19.94-1.pvops.qubes.x86_64 #1 [37973.300619] RIP: 0010:release_pages+0x3c3/0x4b0 [37973.300630] Code: ff ff 48 8b 34 24 49 8d bc 24 80 a1 02 00 45 31 e4 e8 c1 4a 71 00 e9 48 ff ff ff 48 c7 c6 48 70 08 82 4c 89 ef e8 9d 58 02 00 <0f> 0b 4d 85 e4 74 11 48 8b 34 24 49 8d bc 24 80 a1 02 00 e8 95 4a [37973.300666] RSP: 0018:ffffc90000a6fab0 EFLAGS: 00010046 [37973.300678] RAX: 000000000000003e RBX: ffffffff82369cc0 RCX: 0000000000000006 [37973.300693] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880f5b168b0 [37973.300709] RBP: ffff8880873a5a28 R08: ffffc90000000000 R09: 0000000000011dc1 [37973.300725] R10: 00000000000fa000 R11: ffffffff829f1e4d R12: ffff8880f9fd5000 [37973.300740] R13: ffffea00039be440 R14: 0000000000000002 R15: ffff8880873a6000 [37973.300757] FS: 0000000000000000(0000) GS:ffff8880f5b00000(0000) knlGS:0000000000000000 [37973.300772] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [37973.300787] CR2: 00007e31a34ff9d0 CR3: 000000004c3a8003 CR4: 00000000003606e0 [37973.300810] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [37973.300827] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [37973.300842] Call Trace: [37973.300852] tlb_flush_mmu_free+0x36/0x50 [37973.300862] unmap_page_range+0x8f0/0xd00 [37973.300872] unmap_vmas+0x4c/0xa0 [37973.300881] exit_mmap+0xb5/0x1a0 [37973.300984] mmput+0x5f/0x140 [37973.300995] flush_old_exec+0x597/0x6c0 [37973.301004] ? load_elf_phdrs+0x97/0xb0 [37973.301014] load_elf_binary+0x3d9/0x1224 [37973.301023] ? get_acl+0x1a/0x100 [37973.301033] search_binary_handler+0xa6/0x1c0 [37973.301045] __do_execve_file.isra.34+0x587/0x7e0 [37973.301056] __x64_sys_execve+0x34/0x40 [37973.301066] do_syscall_64+0x5b/0x190 [37973.301076] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [37973.301088] RIP: 0033:0x7e31bc9ffacb [37973.301099] Code: Bad RIP value. [37973.301107] RSP: 002b:00007e31a34fd4d8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b [37973.301123] RAX: ffffffffffffffda RBX: 00007e31a34fd500 RCX: 00007e31bc9ffacb [37973.301139] RDX: 00007e31bc786c00 RSI: 00007e31a34fd4e0 RDI: 00007e31bc722cd0 [37973.301155] RBP: 00007e31a34fd560 R08: 00007e31a34fd4f8 R09: 00007e31a34fd520 [37973.301171] R10: 00007e31a34fd4e0 R11: 0000000000000246 R12: 00007e31a34fd598 [37973.301187] R13: 0000000000000000 R14: 000000005e449201 R15: 00007e31a34fd5b0 [37973.301203] Modules linked in: binfmt_misc ip6table_filter ip6_tables xt_conntrack ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c intel_rapl crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel xen_netfront intel_rapl_perf pcspkr u2mfn(O) xen_gntdev xenfs xen_gntalloc xen_blkback xen_privcmd xen_evtchn overlay xen_blkfront [37973.301280] ---[ end trace f2c87841b7f07a99 ]--- [37973.301292] RIP: 0010:release_pages+0x3c3/0x4b0 [37973.301303] Code: ff ff 48 8b 34 24 49 8d bc 24 80 a1 02 00 45 31 e4 e8 c1 4a 71 00 e9 48 ff ff ff 48 c7 c6 48 70 08 82 4c 89 ef e8 9d 58 02 00 <0f> 0b 4d 85 e4 74 11 48 8b 34 24 49 8d bc 24 80 a1 02 00 e8 95 4a [37973.301340] RSP: 0018:ffffc90000a6fab0 EFLAGS: 00010046 [37973.301351] RAX: 000000000000003e RBX: ffffffff82369cc0 RCX: 0000000000000006 [37973.301367] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880f5b168b0 [37973.301383] RBP: ffff8880873a5a28 R08: ffffc90000000000 R09: 0000000000011dc1 [37973.301399] R10: 00000000000fa000 R11: ffffffff829f1e4d R12: ffff8880f9fd5000 [37973.301415] R13: ffffea00039be440 R14: 0000000000000002 R15: ffff8880873a6000 [37973.301431] FS: 0000000000000000(0000) GS:ffff8880f5b00000(0000) knlGS:0000000000000000 [37973.301447] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [37973.301461] CR2: 00007e31bc9ffaa1 CR3: 000000004c3a8003 CR4: 00000000003606e0 [37973.301476] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [37973.301492] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [37973.301508] Kernel panic - not syncing: Fatal exception [37975.195379] Shutting down cpus with NMI [37975.195581] Kernel Offset: disabled [37973.300468] page:ffffea00039be440 count:0 mapcount:-128 mapping:0000000000000000 index:0x1 [37973.300492] flags: 0xfffe000000000() [37973.300502] raw: 000fffe000000000 ffffea00031be488 ffffea00021ebe88 0000000000000000 [37973.300518] raw: 0000000000000001 0000000000000000 00000000ffffff7f 0000000000000000 [37973.300534] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [37973.300552] ------------[ cut here ]------------ [37973.300563] kernel BUG at /home/user/rpmbuild/BUILD/kernel-4.19.94/linux-4.19.94/include/linux/mm.h:519! [37973.300585] invalid opcode: 0000 [#1] SMP PTI [37973.300597] CPU: 1 PID: 13048 Comm: DOM Worker Tainted: G O 4.19.94-1.pvops.qubes.x86_64 #1 [37973.300619] RIP: 0010:release_pages+0x3c3/0x4b0 [37973.300630] Code: ff ff 48 8b 34 24 49 8d bc 24 80 a1 02 00 45 31 e4 e8 c1 4a 71 00 e9 48 ff ff ff 48 c7 c6 48 70 08 82 4c 89 ef e8 9d 58 02 00 <0f> 0b 4d 85 e4 74 11 48 8b 34 24 49 8d bc 24 80 a1 02 00 e8 95 4a [37973.300666] RSP: 0018:ffffc90000a6fab0 EFLAGS: 00010046 [37973.300678] RAX: 000000000000003e RBX: ffffffff82369cc0 RCX: 0000000000000006 [37973.300693] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880f5b168b0 [37973.300709] RBP: ffff8880873a5a28 R08: ffffc90000000000 R09: 0000000000011dc1 [37973.300725] R10: 00000000000fa000 R11: ffffffff829f1e4d R12: ffff8880f9fd5000 [37973.300740] R13: ffffea00039be440 R14: 0000000000000002 R15: ffff8880873a6000 [37973.300757] FS: 0000000000000000(0000) GS:ffff8880f5b00000(0000) knlGS:0000000000000000 [37973.300772] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [37973.300787] CR2: 00007e31a34ff9d0 CR3: 000000004c3a8003 CR4: 00000000003606e0 [37973.300810] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [37973.300827] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [37973.300842] Call Trace: [37973.300852] tlb_flush_mmu_free+0x36/0x50 [37973.300862] unmap_page_range+0x8f0/0xd00 [37973.300872] unmap_vmas+0x4c/0xa0 [37973.300881] exit_mmap+0xb5/0x1a0 [37973.300984] mmput+0x5f/0x140 [37973.300995] flush_old_exec+0x597/0x6c0 [37973.301004] ? load_elf_phdrs+0x97/0xb0 [37973.301014] load_elf_binary+0x3d9/0x1224 [37973.301023] ? get_acl+0x1a/0x100 [37973.301033] search_binary_handler+0xa6/0x1c0 [37973.301045] __do_execve_file.isra.34+0x587/0x7e0 [37973.301056] __x64_sys_execve+0x34/0x40 [37973.301066] do_syscall_64+0x5b/0x190 [37973.301076] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [37973.301088] RIP: 0033:0x7e31bc9ffacb [37973.301099] Code: Bad RIP value. [37973.301107] RSP: 002b:00007e31a34fd4d8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b [37973.301123] RAX: ffffffffffffffda RBX: 00007e31a34fd500 RCX: 00007e31bc9ffacb [37973.301139] RDX: 00007e31bc786c00 RSI: 00007e31a34fd4e0 RDI: 00007e31bc722cd0 [37973.301155] RBP: 00007e31a34fd560 R08: 00007e31a34fd4f8 R09: 00007e31a34fd520 [37973.301171] R10: 00007e31a34fd4e0 R11: 0000000000000246 R12: 00007e31a34fd598 [37973.301187] R13: 0000000000000000 R14: 000000005e449201 R15: 00007e31a34fd5b0 [37973.301203] Modules linked in: binfmt_misc ip6table_filter ip6_tables xt_conntrack ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c intel_rapl crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel xen_netfront intel_rapl_perf pcspkr u2mfn(O) xen_gntdev xenfs xen_gntalloc xen_blkback xen_privcmd xen_evtchn overlay xen_blkfront [37973.301280] ---[ end trace f2c87841b7f07a99 ]--- [37973.301292] RIP: 0010:release_pages+0x3c3/0x4b0 [37973.301303] Code: ff ff 48 8b 34 24 49 8d bc 24 80 a1 02 00 45 31 e4 e8 c1 4a 71 00 e9 48 ff ff ff 48 c7 c6 48 70 08 82 4c 89 ef e8 9d 58 02 00 <0f> 0b 4d 85 e4 74 11 48 8b 34 24 49 8d bc 24 80 a1 02 00 e8 95 4a [37973.301340] RSP: 0018:ffffc90000a6fab0 EFLAGS: 00010046 [37973.301351] RAX: 000000000000003e RBX: ffffffff82369cc0 RCX: 0000000000000006 [37973.301367] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880f5b168b0 [37973.301383] RBP: ffff8880873a5a28 R08: ffffc90000000000 R09: 0000000000011dc1 [37973.301399] R10: 00000000000fa000 R11: ffffffff829f1e4d R12: ffff8880f9fd5000 [37973.301415] R13: ffffea00039be440 R14: 0000000000000002 R15: ffff8880873a6000 [37973.301431] FS: 0000000000000000(0000) GS:ffff8880f5b00000(0000) knlGS:0000000000000000 [37973.301447] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [37973.301461] CR2: 00007e31bc9ffaa1 CR3: 000000004c3a8003 CR4: 00000000003606e0 [37973.301476] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [37973.301492] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [37973.301508] Kernel panic - not syncing: Fatal exception [37975.195379] Shutting down cpus with NMI [37975.195581] Kernel Offset: disabled Is anyone experiencing this issue, or has any solution to this? 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