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authorChristian Krinitsin <mail@krinitsin.com>2025-05-21 21:21:26 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-21 21:21:26 +0200
commit4b927bc37359dec23f67d3427fc982945f24f404 (patch)
tree245449ef9146942dc7fffd0235b48b7e70a00bf2 /gitlab/issues/target_missing/host_missing/accel_missing/1696.toml
parentaa8bd79cec7bf6790ddb01d156c2ef2201abbaab (diff)
downloademulator-bug-study-4b927bc37359dec23f67d3427fc982945f24f404.tar.gz
emulator-bug-study-4b927bc37359dec23f67d3427fc982945f24f404.zip
add gitlab issues in toml format
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+id = 1696
+title = "Linux kernel hangs rarely when booting on the latest qemu"
+state = "closed"
+created_at = "2023-06-08T14:54:10.244Z"
+closed_at = "2023-06-22T14:01:51.130Z"
+labels = []
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1696"
+host-os = "Fedora 37, 38 and Rawhide"
+host-arch = "x86-64"
+qemu-version = "qemu-system-x86-8.0.0-4.fc39.x86_64"
+guest-os = "Linux"
+guest-arch = "x86_64"
+description = """(Downstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=2213346)
+
+In Fedora we have noticed that the latest Linux kernel (rarely) hangs when booting
+on the latest qemu.  It hangs after printing:
+
+```
+[    0.070120] x86/cpu: User Mode Instruction Prevention (UMIP) activated
+[    0.070120] Last level iTLB entries: 4KB 512, 2MB 255, 4MB 127
+[    0.070120] Last level dTLB entries: 4KB 512, 2MB 255, 4MB 127, 1GB 0
+[    0.070120] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
+[    0.070120] Spectre V2 : Mitigation: Retpolines
+[    0.070120] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
+[    0.070120] Spectre V2 : Spectre v2 / SpectreRSB : Filling RSB on VMEXIT
+[    0.070120] Spectre V2 : Enabling Speculation Barrier for firmware calls
+[    0.070120] RETBleed: Mitigation: untrained return thunk
+[    0.070120] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
+[    0.070120] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
+[    0.070120] Freeing SMP alternatives memory: 48K
+```
+
+The next line which would be printed (if it didn't hang) is:
+
+```
+[    0.070794] smpboot: CPU0: AMD Ryzen 9 3900X 12-Core Processor (family: 0x17, model: 0x71, stepping: 0x0)
+```
+
+We've seen this hang on both AMD and Intel.  It probably happens one in every 300 boots."""
+reproduce = """By far the easiest way to reproduce this is to just run guestfish in a loop:
+
+```
+$ while guestfish -a /dev/null -v run >& /tmp/log; do echo -n . ; done 
+```"""
+additional = """The full qemu command is rather long but you can find it in this log file:
+
+https://bugzilla-attachments.redhat.com/attachment.cgi?id=1969620"""