Date: Tue, 12 May 2020 00:49:25 +0200 From: freebsd@sysctl.cz To: Konstantin Belousov <kostikbel@gmail.com> Cc: freebsd-hackers@freebsd.org, Freebsd emulation <freebsd-emulation@freebsd.org>, owner-freebsd-hackers@freebsd.org Subject: Re: Debug linux binary with enable linux emulation Message-ID: <67eed7f18b68f67ff04f628c4c367535@sysctl.cz> In-Reply-To: <20200511115656.GF68906@kib.kiev.ua> References: <24f30eaa0597d79ddadc10d6f993f2a0@sysctl.cz> <20200511115656.GF68906@kib.kiev.ua>
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Dne 2020-05-11 13:56, Konstantin Belousov napsal: > On Mon, May 11, 2020 at 12:28:23AM +0200, freebsd@sysctl.cz wrote: >> Hi, >> I tried debug with gdb for linux emulation >> and have issue with kernel panic. >> >> kldload linux64.ko >> gdb ./Discord or other linux binary >> >> Fatal trap 12: page fault while in kernel mode >> cpuid = 3; apic id = 03 >> fault virtual address = 0x18 >> fault code = supervisor read data, page not present >> instruction pointer = 0x20:0xffffffff82f5b682 >> stack pointer = 0x28:0xfffffe00691fd980 >> frame pointer = 0x28:0xfffffe00691fd9e0 >> code segment = base 0x0, limit 0xfffff, type 0x1b >> = DPL 0, pres 1, long 1, def32 0, gran 1 >> processor eflags = interrupt enabled, resume, IOPL = 0 >> current process = 17392 (fish) >> trap number = 12 >> panic: page fault >> cpuid = 3 >> time = 1589132677 >> KDB: stack backtrace: >> #0 0xffffffff80c1d2f7 at kdb_backtrace+0x67 >> #1 0xffffffff80bd062d at vpanic+0x19d >> #2 0xffffffff80bd0483 at panic+0x43 >> #3 0xffffffff810a7dcc at trap_fatal+0x39c >> #4 0xffffffff810a7e19 at trap_pfault+0x49 >> #5 0xffffffff810a740f at trap+0x29f >> #6 0xffffffff81081bdc at calltrap+0x8 >> #7 0xffffffff82f503d1 at linux_thread_detach+0x21 > Show the line number for linux_thread_detach+0x21. > Or better, compile with INVARIANTS, it should fire an assertion. > Then get a core dump. > >> #8 0xffffffff80be5acf at thread_suspend_check+0x41f >> #9 0xffffffff80c32ed9 at ast+0x3b9 >> #10 0xffffffff810850e9 at doreti_ast+0x1f >> Uptime: 2h56m24s >> Dumping 1146 out of 8042 >> MB:..2%..12%..21%..31%..41%..51%..62%..72%..81%..91%---<<BOOT>>--- >> Copyright (c) 1992-2019 The FreeBSD Project. >> >> GNU gdb (GDB) 9.1 [GDB v9.1 for FreeBSD] >> Copyright (C) 2020 Free Software Foundation, Inc. >> License GPLv3+: GNU GPL version 3 or later >> <http://gnu.org/licenses/gpl.html>; >> This is free software: you are free to change and redistribute it. >> There is NO WARRANTY, to the extent permitted by law. >> Type "show copying" and "show warranty" for details. >> This GDB was configured as "x86_64-portbld-freebsd12.1". >> Type "show configuration" for configuration details. >> For bug reporting instructions, please see: >> <http://www.gnu.org/software/gdb/bugs/>. >> Find the GDB manual and other documentation resources online at: >> <http://www.gnu.org/software/gdb/documentation/>. >> >> For help, type "help". >> Type "apropos word" to search for commands related to "word"... >> Reading symbols from /boot/kernel/kernel... >> (No debugging symbols found in /boot/kernel/kernel) >> 0xffffffff80c01eda in sched_switch () >> (kgdb) >> (kgdb) >> (kgdb) bt >> #0 0xffffffff80c01eda in sched_switch () >> #1 0xffffffff80bdbfa2 in mi_switch () >> #2 0xffffffff80c2bb75 in sleepq_catch_signals () >> #3 0xffffffff80c2be64 in sleepq_timedwait_sig () >> #4 0xffffffff80bdb9a5 in _sleep () >> #5 0xffffffff80bf1ee3 in umtxq_sleep () >> #6 0xffffffff80bf1c90 in do_wait () >> #7 0xffffffff80bef8fe in __umtx_op_wait_uint_private () >> #8 0xffffffff810a8984 in amd64_syscall () >> #9 <signal handler called> >> #10 0x000000080974dedc in ?? () >> Backtrace stopped: Cannot access memory at address 0x7fffffffddc8 >> >> I have now kernel without debug symbols. >> >> M. >> _______________________________________________ >> freebsd-emulation@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-emulation >> To unsubscribe, send any mail to >> "freebsd-emulation-unsubscribe@freebsd.org" > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to > "freebsd-hackers-unsubscribe@freebsd.org" Hi konstantin, I have good news, now we can look detail (kgdb) bt #0 __curthread () at /usr/src/sys/amd64/include/pcpu.h:234 #1 doadump (textdump=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:371 #2 0xffffffff80bd0228 in kern_reboot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:451 #3 0xffffffff80bd0689 in vpanic (fmt=<optimized out>, ap=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:877 #4 0xffffffff80bd0483 in panic (fmt=<unavailable>) at /usr/src/sys/kern/kern_shutdown.c:804 #5 0xffffffff810a7dcc in trap_fatal (frame=0xfffffe00634e58c0, eva=24) at /usr/src/sys/amd64/amd64/trap.c:943 #6 0xffffffff810a7e19 in trap_pfault (frame=0xfffffe00634e58c0, usermode=0) at /usr/src/sys/amd64/amd64/trap.c:767 #7 0xffffffff810a740f in trap (frame=0xfffffe00634e58c0) at /usr/src/sys/amd64/amd64/trap.c:443 #8 <signal handler called> #9 release_futexes (td=<optimized out>, em=0x0) at /usr/src/sys/compat/linux/linux_futex.c:1283 #10 0xffffffff82f503d1 in linux_thread_detach (td=0xfffff8014bd935e0) at /usr/src/sys/compat/linux/linux_fork.c:466 #11 0xffffffff80be5acf in thread_suspend_check (return_instead=0) at /usr/src/sys/kern/kern_thread.c:1010 #12 0xffffffff80c32ed9 in ast (framep=0xfffffe00634e5ac0) at /usr/src/sys/kern/subr_trap.c:342 #13 0xffffffff810850e9 in doreti_ast () at /usr/src/sys/amd64/amd64/exception.S:1149 #14 0x0000000800bb7008 in ?? () #15 0x000000000000000f in ?? () #16 0x0000000000000000 in ?? () (kgdb) list 0xffffffff82f503d1 Function "0xffffffff82f503d1" not defined. (kgdb) list *0xffffffff82f503d1 0xffffffff82f503d1 is in linux_thread_detach (/usr/src/sys/compat/linux/linux_fork.c:468). warning: Source file is more recent than executable. 463 464 LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid); 465 466 release_futexes(td, em); 467 468 child_clear_tid = em->child_clear_tid; 469 470 if (child_clear_tid != NULL) { 471 472 LINUX_CTR2(thread_detach, "thread(%d) %p", (kgdb)
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