linux-hardening - [linus:master] [ubsan/overflow] ed2b548f10: INFO:task_blocked_for_more

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Message-ID: <202504231437.d0a0174e-lkp@intel.com>
Date: Wed, 23 Apr 2025 15:18:40 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Kees Cook <kees@...nel.org>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
	<linux-hardening@...r.kernel.org>, <kasan-dev@...glegroups.com>,
	<linux-kbuild@...r.kernel.org>, <oliver.sang@...el.com>
Subject: [linus:master] [ubsan/overflow]  ed2b548f10:
 INFO:task_blocked_for_more_than#seconds



Hello,


we don't have enough knowledge to dig deep the relation between the random
issues and the change. we tried to rebuild kernel. still see the same config
diff:

--- /pkg/linux/i386-randconfig-013-20250413/gcc-12/d2cf8ccf5a1871058a083c00efe37d7eb91bf6bd/.config     2025-04-22 15:01:12.846009313 +0800
+++ /pkg/linux/i386-randconfig-013-20250413/gcc-12/ed2b548f1017586c44f50654ef9febb42d491f31/.config     2025-04-22 15:00:23.620141366 +0800
@@ -5558,7 +5558,6 @@ CONFIG_UBSAN_BOUNDS_STRICT=y
 CONFIG_UBSAN_SHIFT=y
 # CONFIG_UBSAN_DIV_ZERO is not set
 CONFIG_UBSAN_UNREACHABLE=y
-CONFIG_UBSAN_SIGNED_WRAP=y
 # CONFIG_UBSAN_BOOL is not set
 # CONFIG_UBSAN_ENUM is not set
 # CONFIG_UBSAN_ALIGNMENT is not set


we tried run both parent and this commit until almost 1000 times, the parent
still keep clean on running same test, this commit shows various issues

=========================================================================================
tbox_group/testcase/rootfs/kconfig/compiler/runtime/scale_type:
  vm-snb-i386/rcuscale/debian-11.1-i386-20220923.cgz/i386-randconfig-013-20250413/gcc-12/300s/srcu

d2cf8ccf5a187105 ed2b548f1017586c44f50654ef9
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :999         27%         269:998   last_state.booting
           :999         27%         269:998   last_state.is_incomplete_run
           :999         18%         177:998   dmesg.BUG:kernel_hang_in_boot_stage
           :999          2%          16:998   dmesg.BUG:workqueue_lockup-pool
           :999         18%         176:998   dmesg.INFO:task_blocked_for_more_than#seconds
           :999          8%          76:998   dmesg.IP-Config:Auto-configuration_of_network_failed
           :999         27%         269:998   dmesg.boot_failures


so we still make out this report FYI what we observed in our tests.


kernel test robot noticed "INFO:task_blocked_for_more_than#seconds" on:

commit: ed2b548f1017586c44f50654ef9febb42d491f31 ("ubsan/overflow: Rework integer overflow sanitizer option to turn on everything")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

[test failed on linus/master      c1336865c4c90fcc649df0435a7c86c30030a723]
[test failed on linux-next/master f660850bc246fef15ba78c81f686860324396628]

in testcase: rcuscale
version: 
with following parameters:

	runtime: 300s
	scale_type: srcu



config: i386-randconfig-013-20250413
compiler: gcc-12
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

(please refer to attached dmesg/kmsg for entire log/backtrace)



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202504231437.d0a0174e-lkp@intel.com


[  985.037272][   T22] INFO: task swapper:1 blocked for more than 491 seconds.
[  985.037272][   T22]       Tainted: G                T  6.14.0-rc2-00021-ged2b548f1017 #1
[  985.114644][   T22] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  985.131238][   T22] task:swapper         state:D stack:0     pid:1     tgid:1     ppid:0      task_flags:0x4000040 flags:0x00004000
[  985.184178][   T22] Call Trace:
[ 985.184178][ T22] __schedule (kernel/sched/core.c:5380 kernel/sched/core.c:6764) 
[ 985.239369][ T22] schedule (kernel/sched/core.c:6842 kernel/sched/core.c:6856) 
[ 985.292955][ T22] async_synchronize_cookie_domain (kernel/async.c:317 kernel/async.c:310) 
[ 985.292955][ T22] ? swake_up_all (kernel/sched/wait.c:383) 
[ 985.347537][ T22] wait_for_initramfs (init/initramfs.c:767) 
[ 985.347537][ T22] populate_rootfs (init/initramfs.c:777) 
[ 985.402751][ T22] ? do_copy (init/initramfs.c:771) 
[ 985.402751][ T22] do_one_initcall (init/main.c:1257) 
[ 985.483184][ T22] ? parse_args (kernel/params.c:188) 
[ 985.536816][ T22] do_initcalls (init/main.c:1318 init/main.c:1335) 
[ 985.599031][ T22] kernel_init_freeable (init/main.c:1570) 
[ 985.599031][ T22] ? rest_init (init/main.c:1449) 
[ 985.625998][ T22] kernel_init (init/main.c:1459) 
[ 985.625998][ T22] ret_from_fork (arch/x86/kernel/process.c:154) 
[ 985.680001][ T22] ? rest_init (init/main.c:1449) 
[ 985.680001][ T22] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) 
[ 985.733799][ T22] entry_INT80_32 (arch/x86/entry/entry_32.S:942) 
[  985.842056][   T22]
[  985.842056][   T22] Showing all locks held in the system:
[  985.842056][   T22] 4 locks held by kworker/u4:1/19:
[  985.895824][   T22] 1 lock held by khungtaskd/22:
[ 985.895824][ T22] #0: c88799b0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire (include/linux/rcupdate.h:336) 
[  985.949551][   T22]
[  985.949551][   T22] =============================================
[  985.949551][   T22]
BUG: kernel hang in boot stage



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250423/202504231437.d0a0174e-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki