Date: Tue, 22 Oct 2024 12:30:41 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 282268] linker_load_module() panics with KASAN after post-panic reboot Message-ID: <bug-282268-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D282268 Bug ID: 282268 Summary: linker_load_module() panics with KASAN after post-panic reboot Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: christos@freebsd.org Created attachment 254444 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D254444&action= =3Dedit linker_load_module() disassembly This is a relatively consistent bug, although it does not have a 100% reproduction rate. What I usually do is the following: 1. Boot into a KASAN kernel. 2. Panic the kernel somehow and reboot. 3. During the reboot, it is likely that linker_load_module() will panic when rc(8) is trying to load the modules. I have also attached the linker_load_module() disassembly. Sample panic message: Loading kernel modules: panic: ASan: Invalid access, 4-byte read at 0xfffffe0047935020, MallocRedZone(fb) cpuid =3D 1 time =3D 1729606284 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0xa5/frame 0xfffffe0046c3f= 070 kdb_backtrace() at kdb_backtrace+0xc6/frame 0xfffffe0046c3f1d0 vpanic() at vpanic+0x226/frame 0xfffffe0046c3f370 panic() at panic+0xb5/frame 0xfffffe0046c3f440 kasan_code_name() at kasan_code_name/frame 0xfffffe0046c3f510 linker_load_module() at linker_load_module+0xe03/frame 0xfffffe0046c3fbb0 kern_kldload() at kern_kldload+0x233/frame 0xfffffe0046c3fc70 sys_kldload() at sys_kldload+0xd2/frame 0xfffffe0046c3fd10 amd64_syscall() at amd64_syscall+0x39e/frame 0xfffffe0046c3ff30 fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0046c3ff30 --- syscall (304, FreeBSD ELF64, kldload), rip =3D 0x311d0dce37da, rsp =3D 0x311d0c9d2428, rbp =3D 0x311d0c9d29a0 --- KDB: enter: panic [ thread pid 92 tid 100096 ] Stopped at kdb_enter+0x34: movq $0,0x1f09b11(%rip) db> --=20 You are receiving this mail because: You are the assignee for the bug.=
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