Date: Sat, 11 Apr 2026 02:17:29 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 293382] Dead lock and kernel crash around closefp_impl Message-ID: <bug-293382-227-EMnsRYc15F@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-293382-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293382 --- Comment #63 from Kristofer Peterson <kris@tranception.com> --- I have attached kmod2.c (a kernel module) and call2.c (a program that invokes kmod2.c). kmod2.ko can be built with the following makefile. -------- kmod2.mk -------- KMOD = kmod2 SRCS = kmod2.c .include <bsd.kmod.mk> -------------------------- call2 can be built with the following command line: cc -o call2 call2.c -lthr call2 assumes the syscall in kmod2 is assigned syscall number 210 on loading; if this not the cases on your machine, edit call2.c accordingly. This will run 1 thread, zeroed allocations, starting memory size of 64k, 32 iterations, increase of 4k each iteration: $ call2 1 5 $((1<<16)) 32 4096 This will run 3 threads, not-zeroed allocations, starting memory size of 16M, 128 iterations, increase of 16k each iteration: $ call2 3 5 $((1<<24)) 128 16384 dmesg will normally show lines such as: memkpy/syscall: enter pid:32426 tid:117355 4 16777216 128 16384 memkpy/syscall: exit pid:32426 tid:117355 4 16777216 128 16384 ilog:516 index:515 tsc:5520429094997775 event:4 If the memory checks fail, dmesg output (with kern.msgbuf_show_timestamp="2") will look like this: [375862.366839] memkpy/syscall: enter pid:9651 tid:191508 4 33554432 128 16384 [375862.787488] memkpy/check_block: failed at ptr:0xfffffe10d50e4000 data:0xfffffe10d50a8000 size:35356672 ... [375863.168260] memkpy/check_block: failed at ptr:0xfffffe10d513d000 data:0xfffffe10d5138000 size:35651584 [375863.178042] memkpy/syscall: exit pid:9651 tid:191508 4 33554432 128 16384 ilog:516 index:515 tsc:1428744768499442 event:4 This is an unfinished work in progress but hopefully it is of some assistance. -- You are receiving this mail because: You are the assignee for the bug.home | help
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