Hi Steven, On Sat, Nov 22, 2014 at 02:11:39PM -0500, Steven Rostedt wrote: > On Sat, 22 Nov 2014 10:43:49 -0800 > Fengguang Wu <fengguang...@intel.com> wrote: > > > Greetings, > > > > 0day kernel testing robot got the below dmesg and the first bad commit is > > > > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git > > rfc/seq-buf > > > > commit 716c18f8e57c5eff4725f0b5acbdb2fead202d8c > > Yeah I had a brain fart with this patch that my tests quickly caught > (which I push to my repo for your basic tests as I start testing with > my own tests). But it wasn't up for very long before I rebased it with > a working patch.
Sorry about that! The auto bisect was actually done in Nov 19, unfortunately I was on travel in the past days, which lead to the long delay in reporting out. > > > Author: Steven Rostedt (Red Hat) <rost...@goodmis.org> > > AuthorDate: Tue Nov 18 21:14:11 2014 -0500 > > Commit: Steven Rostedt <rost...@goodmis.org> > > CommitDate: Tue Nov 18 23:26:23 2014 -0500 > > Is it possible for your tests to see if a branch was rebased before > posting bug reports to LKML? This gave me a scare that my new code had > the same brain fart in it. Sure and good idea! I'll implement it right now. Thanks, Fengguang > > ftrace/x86/extable: Add is_ftrace_trampoline() function > > > > Stack traces that happen from function tracing check if the address > > on the stack is a __kernel_text_address(). That is, is the address > > kernel code. This calls core_kernel_text() which returns true > > if the address is part of the builtin kernel code. It also calls > > is_module_text_address() which returns true if the address belongs > > to module code. > > > > But what is missing is ftrace dynamically allocated trampolines. > > These trampolines are allocated for individual ftrace_ops that > > call the ftrace_ops callback functions directly. But if they do a > > stack trace, the code checking the stack wont detect them as they > > are neither core kernel code nor module address space. > > > > Adding another field to ftrace_ops that also stores the size of > > the trampoline assigned to it we can create a new function called > > is_ftrace_trampoline() that returns true if the address is a > > dynamically allocate ftrace trampoline. Note, it ignores trampolines > > that are not dynamically allocated as they will return true with > > the core_kernel_text() function. > > > > Link: http://lkml.kernel.org/r/20141119034829.497125...@goodmis.org > > > > Cc: Thomas Gleixner <t...@linutronix.de> > > Cc: Ingo Molnar <mi...@redhat.com> > > Cc: "H. Peter Anvin" <h...@zytor.com> > > Signed-off-by: Steven Rostedt <rost...@goodmis.org> > > > > +-------------------------------------------------------------------------+------------+------------+------------+ > > | | > > 766d21c795 | 716c18f8e5 | d165a751a0 | > > +-------------------------------------------------------------------------+------------+------------+------------+ > > | boot_successes | > > 60 | 0 | 0 | > > | boot_failures | > > 0 | 20 | 16 | > > | WARNING:at_init/main.c:do_one_initcall() | > > 0 | 20 | 16 | > > | initcall_init_kprobes_returned_with_preemption_imbalance | > > 0 | 20 | 16 | > > | BUG:scheduling_while_atomic | > > 0 | 20 | 11 | > > | BUG:workqueue_leaked_lock_or_atomic:kworker | > > 0 | 1 | 2 | > > | backtrace:init_kprobes | > > 0 | 20 | 16 | > > | backtrace:warn_slowpath_fmt | > > 0 | 20 | 16 | > > | backtrace:kernel_init_freeable | > > 0 | 20 | 16 | > > | backtrace:event_trace_self_tests | > > 0 | 20 | 11 | > > | backtrace:event_trace_self_tests_init | > > 0 | 20 | 11 | > > | backtrace:dump_stack | > > 0 | 1 | 2 | > > | backtrace:test_work | > > 0 | 1 | 2 | > > | initcall_event_trace_self_tests_init_returned_with_preemption_imbalance | > > 0 | 18 | 7 | > > | backtrace:unregister_ftrace_function | > > 0 | 18 | 7 | > > | BUG:kernel_boot_hang | > > 0 | 0 | 2 | > > +-------------------------------------------------------------------------+------------+------------+------------+ > > > > [ 1.649109] Kprobe smoke test: passed successfully > > [ 1.649888] ------------[ cut here ]------------ > > [ 1.649888] ------------[ cut here ]------------ > > [ 1.650631] WARNING: CPU: 0 PID: 1 at init/main.c:803 > > do_one_initcall+0x1a9/0x200() > > [ 1.650631] WARNING: CPU: 0 PID: 1 at init/main.c:803 > > do_one_initcall+0x1a9/0x200() > > [ 1.652149] initcall init_kprobes+0x0/0x1d2 returned with preemption > > imbalance > > [ 1.652149] initcall init_kprobes+0x0/0x1d2 returned with preemption > > imbalance > > [ 1.653357] Modules linked in: > > [ 1.653357] Modules linked in: > > > > [ 1.653857] CPU: 0 PID: 1 Comm: swapper Not tainted > > 3.18.0-rc1-00020-g716c18f #58 > > [ 1.653857] CPU: 0 PID: 1 Comm: swapper Not tainted > > 3.18.0-rc1-00020-g716c18f #58 > > [ 1.655071] 0000000000000009 > > [ 1.655071] 0000000000000009 ffff88001345fdf8 ffff88001345fdf8 > > ffffffff816356b2 ffffffff816356b2 ffff88001345fe38 ffff88001345fe38 > > > > [ 1.656312] ffffffff8108da6a > > [ 1.656312] ffffffff8108da6a ffff88001345fe58 ffff88001345fe58 > > 0000000000000000 0000000000000000 0000000000000001 0000000000000001 > > > > [ 1.657542] 0000000000000001 > > [ 1.657542] 0000000000000001 ffffffff81f09df6 ffffffff81f09df6 > > 0000000000000000 0000000000000000 ffff88001345fe98 ffff88001345fe98 > > > > [ 1.658800] Call Trace: > > [ 1.658800] Call Trace: > > [ 1.659200] [<ffffffff816356b2>] dump_stack+0x19/0x1b > > [ 1.659200] [<ffffffff816356b2>] dump_stack+0x19/0x1b > > [ 1.660020] [<ffffffff8108da6a>] warn_slowpath_common+0x7a/0xa0 > > [ 1.660020] [<ffffffff8108da6a>] warn_slowpath_common+0x7a/0xa0 > > [ 1.660991] [<ffffffff81f09df6>] ? debugfs_kprobe_init+0xab/0xab > > [ 1.660991] [<ffffffff81f09df6>] ? debugfs_kprobe_init+0xab/0xab > > [ 1.661994] [<ffffffff8108dad6>] warn_slowpath_fmt+0x46/0x50 > > [ 1.661994] [<ffffffff8108dad6>] warn_slowpath_fmt+0x46/0x50 > > [ 1.662900] [<ffffffff81f09fbf>] ? init_kprobes+0x1c9/0x1d2 > > [ 1.662900] [<ffffffff81f09fbf>] ? init_kprobes+0x1c9/0x1d2 > > [ 1.663810] [<ffffffff81f09df6>] ? debugfs_kprobe_init+0xab/0xab > > [ 1.663810] [<ffffffff81f09df6>] ? debugfs_kprobe_init+0xab/0xab > > [ 1.665184] [<ffffffff810003c9>] do_one_initcall+0x1a9/0x200 > > [ 1.665184] [<ffffffff810003c9>] do_one_initcall+0x1a9/0x200 > > [ 1.666615] [<ffffffff81ef10f1>] kernel_init_freeable+0x102/0x185 > > [ 1.666615] [<ffffffff81ef10f1>] kernel_init_freeable+0x102/0x185 > > [ 1.668170] [<ffffffff81631e90>] ? rest_init+0xd0/0xd0 > > [ 1.668170] [<ffffffff81631e90>] ? rest_init+0xd0/0xd0 > > [ 1.669476] [<ffffffff81631e9e>] kernel_init+0xe/0xf0 > > [ 1.669476] [<ffffffff81631e9e>] kernel_init+0xe/0xf0 > > [ 1.670763] [<ffffffff8163d77a>] ret_from_fork+0x7a/0xb0 > > [ 1.670763] [<ffffffff8163d77a>] ret_from_fork+0x7a/0xb0 > > [ 1.672123] [<ffffffff81631e90>] ? rest_init+0xd0/0xd0 > > [ 1.672123] [<ffffffff81631e90>] ? rest_init+0xd0/0xd0 > > [ 1.673365] ---[ end trace 660d24cf53fa6caf ]--- > > [ 1.673365] ---[ end trace 660d24cf53fa6caf ]--- > > > > git bisect start d165a751a05de3cd926f1378b0df3de3b7cab051 > > fc14f9c1272f62c3e8d01300f52467c0d9af50f9 -- > > git bisect bad 36e2c5fccd02b60b6e98f08aa61d33f43188fb08 # 16:03 0- > > 15 Merge 'jlayton/nfsd-3.20' into devel-lkp-ib04-smoke-201411191439 > > git bisect bad 847d1c3e2f2d8703f63b73420eb7a46c26f54e9b # 16:35 0- > > 17 Merge 'shawnguo/imx/soc' into devel-lkp-ib04-smoke-201411191439 > > git bisect bad d4620f93d2a5011fe43d5de0ac8c8fd670b00705 # 17:19 0- > > 16 Merge 'pm/bleeding-edge' into devel-lkp-ib04-smoke-201411191439 > > git bisect good d5b06eebb3c327b5ae53d4a80aa4a8061a8ba125 # 17:41 20+ > > 0 0day base guard for 'devel-lkp-ib04-smoke-201411191439' > > git bisect bad 5bc53bc9b7a94d183337b5233472a2480abbc655 # 18:36 0- > > 16 Merge 'trace/rfc/seq-buf' into devel-lkp-ib04-smoke-201411191439 > > git bisect bad c965f1fce4bc52abaaea95113a50c97b183b311e # 19:39 0- > > 17 blktrace/tracing: Use trace_seq_has_overflowed() helper function > > git bisect good 8520dedbbf7578a397ecdfcf6ab83f775f914cfe # 20:19 20+ > > 0 tracing: kdb: Fix kernel livelock with empty buffers > > git bisect good a9ce7c36aa4256019180c590d60e2fad7431c749 # 20:43 20+ > > 0 tracing: Fix race of function probes counting > > git bisect bad f745f25c1f01464c376b7fe82e34db08ed22f321 # 21:06 0- > > 2 x86/kvm/tracing: Use helper function trace_seq_buffer_ptr() > > git bisect bad 716c18f8e57c5eff4725f0b5acbdb2fead202d8c # 21:23 0- > > 20 ftrace/x86/extable: Add is_ftrace_trampoline() function > > git bisect good 766d21c7953e3b02699183309d997b1c2cd9e0bb # 22:32 20+ > > 0 ftrace/x86: Add frames pointers to trampoline as necessary > > # first bad commit: [716c18f8e57c5eff4725f0b5acbdb2fead202d8c] > > ftrace/x86/extable: Add is_ftrace_trampoline() function > > git bisect good 766d21c7953e3b02699183309d997b1c2cd9e0bb # 22:36 60+ > > 0 ftrace/x86: Add frames pointers to trampoline as necessary > > git bisect bad d165a751a05de3cd926f1378b0df3de3b7cab051 # 22:36 0- > > 16 0day head guard for 'devel-lkp-ib04-smoke-201411191439' > > git bisect good fc14f9c1272f62c3e8d01300f52467c0d9af50f9 # 22:39 60+ > > 2 Linux 3.18-rc5 > > git bisect good fad15b648058ee5ea4b352888afa9030e0092f1b # 23:18 60+ > > 0 Add linux-next specific files for 20141118 > > > > > > This script may reproduce the error. > > > > ---------------------------------------------------------------------------- > > #!/bin/bash > > > > kernel=$1 > > initrd=yocto-minimal-x86_64.cgz > > > > wget --no-clobber > > https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd > > > > kvm=( > > qemu-system-x86_64 > > -cpu kvm64 > > -enable-kvm > > -kernel $kernel > > -initrd $initrd > > -m 320 > > -smp 1 > > -net nic,vlan=1,model=e1000 > > -net user,vlan=1 > > -boot order=nc > > -no-reboot > > -watchdog i6300esb > > -rtc base=localtime > > -serial stdio > > -display none > > -monitor null > > ) > > > > append=( > > hung_task_panic=1 > > earlyprintk=ttyS0,115200 > > debug > > apic=debug > > sysrq_always_enabled > > rcupdate.rcu_cpu_stall_timeout=100 > > panic=-1 > > softlockup_panic=1 > > nmi_watchdog=panic > > oops=panic > > load_ramdisk=2 > > prompt_ramdisk=0 > > console=ttyS0,115200 > > console=tty0 > > vga=normal > > root=/dev/ram0 > > rw > > drbd.minor_count=8 > > ) > > > > "${kvm[@]}" --append "${append[*]}" > > ---------------------------------------------------------------------------- > > > > Thanks, > > Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
