On Tue, Jan 24, 2012 at 02:09:03PM +0200, Andriy Gapon wrote: A> on 24/01/2012 13:54 Gleb Smirnoff said the following: A> > On Mon, Jan 23, 2012 at 06:56:08PM +0200, Andriy Gapon wrote: A> > A> on 23/01/2012 18:46 Gleb Smirnoff said the following: A> > A> > On Mon, Jan 23, 2012 at 06:43:23PM +0200, Andriy Gapon wrote: A> > A> > A> > db> bt A> > A> > A> > Tracing pid 1 tid 100001 td 0xfffffe0001d5e000 A> > A> > A> > kdb_enter() at kdb_enter+0x3b A> > A> > A> > panic() at panic+0x1c7 A> > A> > A> > _mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x10f A> > A> > A> > cnputs() at cnputs+0x7a A> > A> > A> > vprintf() at vprintf+0xcb A> > A> > A> > printf() at printf+0x67 A> > A> > A> > db_putc() at db_putc+0x81 A> > A> > A> A> > A> > A> Ah, db_putc does something different from what I expected. A> > A> > A> Can you hack it to never use printf? A> > A> > A> > A> > Just cut printfs from db_putc()? A> > A> A> > A> Make the following condition be always false: A> > A> A> > A> if (!kdb_active || ddb_use_printf) { A> > A> A> > A> E.g.: A> > A> A> > A> if (0) { A> > A> > With this change + s/printf/db_printf/ in subr_witness.c I've A> > got the following during reboot: A> > A> > Rebooting... A> > lllock order reversal: A> > 1st 0xffffffff80937140 smp rendezvous (smp rendezvous) _at_ /usr/src/head/sys/kern/kern_shutdown.c:542 A> > 2nd 0xffffffff80b13280 syscons video lock (syscons video lock) _at_ /usr/src/head/sys/dev/syscons/syscons.c:1921 A> > panic: mtx_lock_spin: recursed on non-recursive mutex cnputs_mtx _at_ /usr/src/head/sys/kern/kern_cons.c:500 A> A> Can you disable video console? Yes, now: Rebooting... lock order reversal: 1st 0xffffffff80937140 smp rendezvous (smp rendezvous) _at_ /usr/src/head/sys/kern/kern_shutdown.c:542 2nd 0xfffffe0001f5d838 uart_hwmtx (uart_hwmtx) _at_ /usr/src/head/sys/dev/uart/uart_cpu.h:92 panic: mtx_lock_spin: recursed on non-recursive mutex cnputs_mtx _at_ /usr/src/head/sys/kern/kern_cons.c:500 cpuid = 0 KDB: enter: panic [ thread pid 1 tid 100001 ] Stopped at kdb_enter+0x3b: movq $0,0x5159f2(%rip) db> bt Tracing pid 1 tid 100001 td 0xfffffe0001d5e000 kdb_enter() at kdb_enter+0x3b panic() at panic+0x1c7 _mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x10f cnputs() at cnputs+0x7a putchar() at putchar+0x11f kvprintf() at kvprintf+0x83 vprintf() at vprintf+0x85 printf() at printf+0x67 kdb_backtrace() at kdb_backtrace+0x2d _witness_debugger() at _witness_debugger+0x2c witness_checkorder() at witness_checkorder+0x854 _mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x99 uart_cnputc() at uart_cnputc+0x3e cnputc() at cnputc+0x4c cnputs() at cnputs+0x26 putchar() at putchar+0x11f kvprintf() at kvprintf+0x83 vprintf() at vprintf+0x85 printf() at printf+0x67 cpu_reset() at cpu_reset+0x81 kern_reboot() at kern_reboot+0x3a5 sys_reboot() at sys_reboot+0x42 amd64_syscall() at amd64_syscall+0x39e Xfast_syscall() at Xfast_syscall+0xf7 --- syscall (55, FreeBSD ELF64, sys_reboot), rip = 0x40ea3c, rsp = 0x7fffffffd6d8, rbp = 0x49 --- -- Totus tuus, Glebius.Received on Tue Jan 24 2012 - 11:32:48 UTC
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