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bh=rbEE2ktFuziJ23HddLZwp0+Xz4fe6TwhCTXmZfznxyo=; b=yuBAgi6v3zFRpZ22xX9ApTO94fr04N1V4k2BIyPubvuxN6bw7y+NPPWSYlfhumcjUmCv2P f6SBIBqSie2vTYN2pInkGhDirEzpD+4rfQSUX4wz0Ovj06JDsRhvDF5cupjXWHMTpaimy1 L5aIR3htqKQYWXy3b0Zmt75v+loiQVo= X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 5DF5518007A X-Stat-Signature: h69uzn59hkjnwhf1ikc5nuh18f97u9g7 Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=hvUie2VG; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=none (imf24.hostedemail.com: domain of yi.l.liu@intel.com has no SPF policy when checking 192.55.52.151) smtp.mailfrom=yi.l.liu@intel.com X-Rspam-User: X-HE-Tag: 1655302477-62455 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Alex, On 2022/6/15 22:02, Alex Williamson wrote: > On Wed, 15 Jun 2022 13:52:10 +0300 > Yishai Hadas wrote: > >> Adding some extra relevant people from the MM area. >> >> On 15/06/2022 13:43, Yishai Hadas wrote: >>> Hi All, >>> >>> Any idea what could cause the below break in 5.19 ? we run QEMU and >>> immediately the machine is stuck. >>> >>> Once I run, echo l > /proc/sysrq-trigger could see the below task >>> which seems to be stuck.. >>> >>> This basic flow worked fine in 5.18. > > Spent Friday bisecting this and posted this fix: > > https://lore.kernel.org/all/165490039431.944052.12458624139225785964.stgit@omen/ > > I expect you're hotting the same. Thanks, I also hit a hang at calling pin_user_pages_remote() in the vaddr_get_pfns(). With the fix in the link, the issue got fixed. You may add my test-by to your fix. :-) > Alex > >>> >>> [1162.056583] NMI backtrace for cpu 4 >>> [ 1162.056585] CPU: 4 PID: 1979 Comm: qemu-system-x86 Not tainted >>> 5.19.0-rc1 #747 >>> [ 1162.056587] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), >>> BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 >>> [ 1162.056588] RIP: 0010:pmd_huge+0x0/0x20 >>> [ 1162.056592] Code: 49 89 44 24 28 48 8b 47 30 49 89 44 24 30 31 c0 >>> 41 5c c3 5b b8 01 00 00 00 5d 41 5c c3 cc cc cc cc cc cc cc cc cc cc >>> cc cc cc <0f> 1f 44 00 00 31 c0 48 f7 c7 9f ff ff ff 74 0f 81 e7 81 00 >>> 00 00 >>> [ 1162.056594] RSP: 0018:ffff888146253b38 EFLAGS: 00000202 >>> [ 1162.056596] RAX: ffff888101461980 RBX: ffff888146253bc0 RCX: >>> 000ffffffffff000 >>> [ 1162.056597] RDX: ffff88814fa22000 RSI: 00007f9f68231000 RDI: >>> 000000010a6b6067 >>> [ 1162.056598] RBP: ffff888111b90dc0 R08: 000000000002f424 R09: >>> 0000000000000001 >>> [ 1162.056599] R10: ffffffff825c2a40 R11: 0000000000000a08 R12: >>> ffff88814fa22a08 >>> [ 1162.056600] R13: 000000010a6b6067 R14: 0000000000052202 R15: >>> 00007f9f68231000 >>> [ 1162.056602] FS:  00007f9f6c228c40(0000) GS:ffff88885f900000(0000) >>> knlGS:0000000000000000 >>> [ 1162.056605] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> [ 1162.056606] CR2: 00005643994fd0ed CR3: 00000001496da005 CR4: >>> 0000000000372ea0 >>> [ 1162.056607] DR0: 0000000000000000 DR1: 0000000000000000 DR2: >>> 0000000000000000 >>> [ 1162.056609] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: >>> 0000000000000400 >>> [ 1162.056610] Call Trace: >>> [ 1162.056611]  >>> [ 1162.056611]  follow_page_mask+0x196/0x5e0 >>> [ 1162.056615]  __get_user_pages+0x190/0x5d0 >>> [ 1162.056617]  ? flush_workqueue_prep_pwqs+0x110/0x110 >>> [ 1162.056620]  __gup_longterm_locked+0xaf/0x470 >>> [ 1162.056624]  vaddr_get_pfns+0x8e/0x240 [vfio_iommu_type1] >>> [ 1162.056628]  ? qi_flush_iotlb+0x83/0xa0 >>> [ 1162.056631]  vfio_pin_pages_remote+0x326/0x460 [vfio_iommu_type1] >>> [ 1162.056634]  vfio_iommu_type1_ioctl+0x421/0x14f0 [vfio_iommu_type1] >>> [ 1162.056638]  __x64_sys_ioctl+0x3e4/0x8e0 >>> [ 1162.056641]  do_syscall_64+0x3d/0x90 >>> [ 1162.056644]  entry_SYSCALL_64_after_hwframe+0x46/0xb0 >>> [ 1162.056646] RIP: 0033:0x7f9f6d14317b >>> [ 1162.056648] Code: 0f 1e fa 48 8b 05 1d ad 0c 00 64 c7 00 26 00 00 >>> 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 >>> 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ed ac 0c 00 f7 d8 64 89 >>> 01 48 >>> [ 1162.056650] RSP: 002b:00007fff4fca15b8 EFLAGS: 00000246 ORIG_RAX: >>> 0000000000000010 >>> [ 1162.056652] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: >>> 00007f9f6d14317b >>> [ 1162.056653] RDX: 00007fff4fca1620 RSI: 0000000000003b71 RDI: >>> 000000000000001c >>> [ 1162.056654] RBP: 00007fff4fca1650 R08: 0000000000000001 R09: >>> 0000000000000000 >>> [ 1162.056655] R10: 0000000100000000 R11: 0000000000000246 R12: >>> 0000000000000000 >>> [ 1162.056656] R13: 0000000000000000 R14: 0000000000000000 R15: >>> 0000000000000000 >>> [ 1162.056657]  >>> >>> Yishai >>> >> > -- Regards, Yi Liu