Date: Tue, 31 Aug 2021 21:07:53 -0600 From: Warner Losh <imp@bsdimp.com> To: Craig Leres <leres@freebsd.org> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, Ian Lepore <ian@freebsd.org> Subject: Re: Patched gpsd and /dev/pps0 results in "sleeping thread" kernel panic Message-ID: <CANCZdfoQTfWC4j=ArTdGQMwDDNsg-LMMYSrtF4BHtHZSuV%2BCkw@mail.gmail.com> In-Reply-To: <5476ea21-9e8a-32f5-08ff-add46c02d910@freebsd.org> References: <dc4c4948-738e-c530-d96f-ade5cce5d3d2@freebsd.org> <CANCZdfos2NamQXXcjYyVAcJvUL21kQbjUR4KRTp1xXKsQN3SrA@mail.gmail.com> <5476ea21-9e8a-32f5-08ff-add46c02d910@freebsd.org>
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--000000000000ed626c05cae65f94 Content-Type: text/plain; charset="UTF-8" On Tue, Aug 31, 2021 at 8:11 PM Craig Leres <leres@freebsd.org> wrote: > > On 8/31/21 6:54 PM, Warner Losh wrote: > > Can you post a traceback? We recently tightened up the sleeping > conditions > > and many of the panics are straight forward to fix > > Is this sufficient? > Maybe. I'm guessing that the pps driver isn't setting driver_mtx for the pps_state that it keeps, so when we're sleeping in pps_ioctl we're not dropping the the ppbus lock, which leads to this diagnostic. Warner > Craig > > toc2 4 # kgdb /boot/kernel/kernel /var/crash/vmcore.1 > GNU gdb (GDB) 10.2 [GDB v10.2 for FreeBSD] > Copyright (C) 2021 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-freebsd12.2". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > <https://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... > Reading symbols from /boot/kernel.LBLNET/kernel.debug... > > Unread portion of the kernel message buffer: > Sleeping thread (tid 101408, pid 2046) owns a non-sleepable lock > KDB: stack backtrace of thread 101408: > sched_switch() at sched_switch+0x630/frame 0xfffffe0070e4f760 > mi_switch() at mi_switch+0xd4/frame 0xfffffe0070e4f790 > sleepq_catch_signals() at sleepq_catch_signals+0x403/frame > 0xfffffe0070e4f7e0 > sleepq_timedwait_sig() at sleepq_timedwait_sig+0x14/frame > 0xfffffe0070e4f820 > _sleep() at _sleep+0x1b3/frame 0xfffffe0070e4f8a0 > pps_ioctl() at pps_ioctl+0x298/frame 0xfffffe0070e4f8f0 > ppsioctl() at ppsioctl+0x48/frame 0xfffffe0070e4f920 > devfs_ioctl() at devfs_ioctl+0xb0/frame 0xfffffe0070e4f970 > VOP_IOCTL_APV() at VOP_IOCTL_APV+0x7b/frame 0xfffffe0070e4f9a0 > vn_ioctl() at vn_ioctl+0x16a/frame 0xfffffe0070e4fab0 > devfs_ioctl_f() at devfs_ioctl_f+0x1e/frame 0xfffffe0070e4fad0 > kern_ioctl() at kern_ioctl+0x2b7/frame 0xfffffe0070e4fb30 > sys_ioctl() at sys_ioctl+0xfa/frame 0xfffffe0070e4fc00 > amd64_syscall() at amd64_syscall+0x387/frame 0xfffffe0070e4fd30 > fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0070e4fd30 > --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8004c899a, rsp = > 0x7fffdfdfc6a8, rbp = 0x7fffdfdfc730 --- > panic: sleeping thread > cpuid = 8 > time = 1630456142 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame > 0xfffffe005ab73ab0 > vpanic() at vpanic+0x17b/frame 0xfffffe005ab73b00 > panic() at panic+0x43/frame 0xfffffe005ab73b60 > propagate_priority() at propagate_priority+0x282/frame 0xfffffe005ab73b90 > turnstile_wait() at turnstile_wait+0x30c/frame 0xfffffe005ab73be0 > __mtx_lock_sleep() at __mtx_lock_sleep+0x199/frame 0xfffffe005ab73c70 > ppcintr() at ppcintr+0x2a0/frame 0xfffffe005ab73c90 > ithread_loop() at ithread_loop+0x23c/frame 0xfffffe005ab73cf0 > fork_exit() at fork_exit+0x7e/frame 0xfffffe005ab73d30 > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe005ab73d30 > --- trap 0, rip = 0, rsp = 0, rbp = 0 --- > Uptime: 17m20s > Dumping 607 out of 12240 > MB:..3%..11%..22%..32%..43%..51%..61%..72%..82%..93% > > __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55 > 55 /usr/src/sys/amd64/include/pcpu_aux.h: No such file or directory. > (kgdb) bt > #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55 > #1 doadump (textdump=1) at ../../../kern/kern_shutdown.c:371 > #2 0xffffffff80b83ada in kern_reboot (howto=260) > at ../../../kern/kern_shutdown.c:451 > #3 0xffffffff80b83f33 in vpanic (fmt=<optimized out>, ap=<optimized out>) > at ../../../kern/kern_shutdown.c:880 > #4 0xffffffff80b83d53 in panic (fmt=<unavailable>) > at ../../../kern/kern_shutdown.c:807 > #5 0xffffffff80be7152 in propagate_priority (td=0xfffff80196959740) > at ../../../kern/subr_turnstile.c:228 > #6 0xffffffff80be7d1c in turnstile_wait (ts=0xfffff8000357a780, > owner=<optimized out>, queue=0) at ../../../kern/subr_turnstile.c:785 > #7 0xffffffff80b62ca9 in __mtx_lock_sleep (c=0xfffff80003969bd0, > v=<optimized out>) at ../../../kern/kern_mutex.c:654 > #8 0xffffffff8086fcc0 in ppcintr (arg=0xfffff80003969b00) > at ../../../dev/ppc/ppc.c:1546 > #9 0xffffffff80b4637c in intr_event_execute_handlers (p=<optimized out>, > ie=0xfffff800030d9d00) at ../../../kern/kern_intr.c:1143 > #10 ithread_execute_handlers (p=<optimized out>, ie=0xfffff800030d9d00) > at ../../../kern/kern_intr.c:1156 > #11 ithread_loop (arg=0xfffff800039aa7e0) at ../../../kern/kern_intr.c:1236 > #12 0xffffffff80b42e1e in fork_exit ( > callout=0xffffffff80b46140 <ithread_loop>, arg=0xfffff800039aa7e0, > frame=0xfffffe005ab73d40) at ../../../kern/kern_fork.c:1080 > #13 <signal handler called> > (kgdb) > --000000000000ed626c05cae65f94--
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