Hey, so I've been getting system instability problems after shutting down virtual machine with GPU pass-through in 4.17-rc series and I finally got around to bisecting it. Seems to be caused by 356e88ebe4473a3663cf3d14727ce293a4526d34 and problem seems to be gone after reverting it. trce from /varlog/messages: Jun 1 22:47:23 milkyway kernel: BUG: Bad page state in process qemu-system-x86 pfn:7178f3 Jun 1 22:47:23 milkyway kernel: page:fffffbfddc5e3cc0 count:0 mapcount:1 mapping:0000000000000000 index:0x1 Jun 1 22:47:23 milkyway kernel: flags: 0x200000000000000() Jun 1 22:47:23 milkyway kernel: raw: 0200000000000000 0000000000000000 0000000000000001 0000000000000000 Jun 1 22:47:23 milkyway kernel: raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000 Jun 1 22:47:23 milkyway kernel: page dumped because: nonzero mapcount Jun 1 22:47:23 milkyway kernel: Modules linked in: x86_pkg_temp_thermal coretemp crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc aesni_intel eeepc_wmi asus_wmi wmi_bmof aes_x86_64 crypto_simd cryptd wmi glue_helper Jun 1 22:47:23 milkyway kernel: CPU: 4 PID: 4303 Comm: qemu-system-x86 Not tainted 4.16.0+ #26 Jun 1 22:47:23 milkyway kernel: Hardware name: ASUS All Series/SABERTOOTH Z97 MARK 2, BIOS 3503 04/18/2018 Jun 1 22:47:23 milkyway kernel: Call Trace: Jun 1 22:47:23 milkyway kernel: dump_stack+0x46/0x5b Jun 1 22:47:23 milkyway kernel: bad_page+0xbf/0x120 Jun 1 22:47:23 milkyway kernel: free_pcppages_bulk+0x434/0x500 Jun 1 22:47:23 milkyway kernel: free_unref_page+0x33/0x40 Jun 1 22:47:23 milkyway kernel: dma_free_pagelist+0x27/0x40 Jun 1 22:47:23 milkyway kernel: intel_iommu_unmap+0x114/0x150 Jun 1 22:47:23 milkyway kernel: __iommu_unmap+0xe4/0x130 Jun 1 22:47:23 milkyway kernel: vfio_unmap_unpin+0x13f/0x330 Jun 1 22:47:23 milkyway kernel: vfio_remove_dma+0x12/0x40 Jun 1 22:47:23 milkyway kernel: vfio_iommu_unmap_unpin_all+0x16/0x30 Jun 1 22:47:23 milkyway kernel: vfio_iommu_type1_detach_group+0x2b3/0x2c0 Jun 1 22:47:23 milkyway kernel: __vfio_group_unset_container+0x4d/0x180 Jun 1 22:47:23 milkyway kernel: vfio_group_put_external_user+0x9/0x20 Jun 1 22:47:23 milkyway kernel: kvm_vfio_group_put_external_user+0x1d/0x30 Jun 1 22:47:23 milkyway kernel: kvm_vfio_destroy+0x4a/0xc0 Jun 1 22:47:23 milkyway kernel: kvm_put_kvm+0x1a1/0x290 Jun 1 22:47:23 milkyway kernel: kvm_vm_release+0x18/0x20 Jun 1 22:47:23 milkyway kernel: __fput+0xcd/0x1f0 Jun 1 22:47:23 milkyway kernel: task_work_run+0x8d/0xb0 Jun 1 22:47:23 milkyway kernel: do_exit+0x2d9/0xbe0 Jun 1 22:47:23 milkyway kernel: ? hrtimer_init+0x10/0x10 Jun 1 22:47:23 milkyway kernel: do_group_exit+0x31/0xb0 Jun 1 22:47:23 milkyway kernel: get_signal+0x12d/0x570 Jun 1 22:47:23 milkyway kernel: do_signal+0x3e/0x5d0 Jun 1 22:47:23 milkyway kernel: exit_to_usermode_loop+0x46/0x80 Jun 1 22:47:23 milkyway kernel: do_syscall_64+0xe0/0xf0 Jun 1 22:47:23 milkyway kernel: entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Jun 1 22:47:23 milkyway kernel: RIP: 0033:0x7e7c7512750f Jun 1 22:47:23 milkyway kernel: RSP: 002b:00007e77df3f29d0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca Jun 1 22:47:23 milkyway kernel: RAX: fffffffffffffdfc RBX: 0000000000000189 RCX: 00007e7c7512750f Jun 1 22:47:23 milkyway kernel: RDX: 0000000000000000 RSI: 0000000000000189 RDI: 000057066f99c0a8 Jun 1 22:47:23 milkyway kernel: RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff Jun 1 22:47:23 milkyway kernel: R10: 00007e77df3f2a80 R11: 0000000000000246 R12: 00007e77df3f2a80 Jun 1 22:47:23 milkyway kernel: R13: 000057066f99c0a8 R14: 00007e77df3f2a80 R15: 00007fff7e253a30 Jun 1 22:47:23 milkyway kernel: Disabling lock debugging due to kernel taint git bisect log git bisect start # good: [0adb32858b0bddf4ada5f364a84ed60b196dbcda] Linux 4.16 git bisect good 0adb32858b0bddf4ada5f364a84ed60b196dbcda # bad: [60cc43fc888428bb2f18f08997432d426a243338] Linux 4.17-rc1 git bisect bad 60cc43fc888428bb2f18f08997432d426a243338 # good: [ac9053d2dcb9e8c3fa35ce458dfca8fddc141680] Merge tag 'usb-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb git bisect good ac9053d2dcb9e8c3fa35ce458dfca8fddc141680 # good: [38c23685b273cfb4ccf31a199feccce3bdcb5d83] Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc git bisect good 38c23685b273cfb4ccf31a199feccce3bdcb5d83 # bad: [fbe173e3ffbd897b5a859020d714c0eaf4af2a1a] Merge tag 'rtc-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux git bisect bad fbe173e3ffbd897b5a859020d714c0eaf4af2a1a # bad: [299f89d53e61c0b17479cc7d6f3b5382d5e83f28] Merge tag 'leaks-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tobin/leaks git bisect bad 299f89d53e61c0b17479cc7d6f3b5382d5e83f28 # good: [28da7be5ebc096ada5e6bc526c623bdd8c47800a] Merge tag 'mailbox-v4.17' of git://git.linaro.org/landing-teams/working/fujitsu/integration git bisect good 28da7be5ebc096ada5e6bc526c623bdd8c47800a # good: [19fd08b85bc7e0502b55cd726f466df82ee7e777] Merge tag 'for-linus-unmerged' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma git bisect good 19fd08b85bc7e0502b55cd726f466df82ee7e777 # good: [14d8d776aeda8e367a9354b6cb6a0696671630c9] Merge branch 'lorenzo/pci/endpoint' git bisect good 14d8d776aeda8e367a9354b6cb6a0696671630c9 # bad: [f605ba97fb80522656c7dce9825a908f1e765b57] Merge tag 'vfio-v4.17-rc1' of git://github.com/awilliam/linux-vfio git bisect bad f605ba97fb80522656c7dce9825a908f1e765b57 # good: [d2f48c5d7fd791104f3227d8e6b55fca892eb2ba] Merge branch 'lorenzo/pci/xgene' git bisect good d2f48c5d7fd791104f3227d8e6b55fca892eb2ba # good: [dc32bb678e103afbcfa4d814489af0566307f528] vhost: add vsock compat ioctl git bisect good dc32bb678e103afbcfa4d814489af0566307f528 # bad: [da9147140fe3de5a3a3fe5fe7f69739d4f39bea1] MAINTAINERS: vfio/platform: Update sub-maintainer git bisect bad da9147140fe3de5a3a3fe5fe7f69739d4f39bea1 # bad: [356e88ebe4473a3663cf3d14727ce293a4526d34] vfio/type1: Improve memory pinning process for raw PFN mapping git bisect bad 356e88ebe4473a3663cf3d14727ce293a4526d34 # good: [c9f89c3f87cfc026d88c08054710902dd52a7772] vfio-mdev/samples: change RDI interrupt condition git bisect good c9f89c3f87cfc026d88c08054710902dd52a7772 # first bad commit: [356e88ebe4473a3663cf3d14727ce293a4526d34] vfio/type1: Improve memory pinning process for raw PFN mapping Cheers, Amadeusz
