* Re: [PATCH] lib/vsprintf: Validate sleepable context during restrictred pointer formatting
[not found] <20260317-restricted-pointers-final-v1-1-b4dca0ed6483@linutronix.de>
@ 2026-03-20 1:53 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-03-20 1:53 UTC (permalink / raw)
To: Thomas Weißschuh
Cc: oe-lkp, lkp, linux-kernel, Andrew Morton, Petr Mladek,
Steven Rostedt, Andy Shevchenko, Rasmus Villemoes,
Sergey Senozhatsky, Thomas Weißschuh, oliver.sang
Hello,
kernel test robot noticed "BUG:sleeping_function_called_from_invalid_context_at_lib/vsprintf.c" on:
commit: a3aa148a203538960cf380021ba5605a35dd573b ("[PATCH] lib/vsprintf: Validate sleepable context during restrictred pointer formatting")
url: https://github.com/intel-lab-lkp/linux/commits/Thomas-Wei-schuh/lib-vsprintf-Validate-sleepable-context-during-restrictred-pointer-formatting/20260318-000650
patch link: https://lore.kernel.org/all/20260317-restricted-pointers-final-v1-1-b4dca0ed6483@linutronix.de/
patch subject: [PATCH] lib/vsprintf: Validate sleepable context during restrictred pointer formatting
in testcase: trinity
version:
with following parameters:
runtime: 300s
group: group-00
nr_groups: 5
config: x86_64-kexec
compiler: clang-20
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+---------------------------------------------------------------------+------------+------------+
| | 2d1373e424 | a3aa148a20 |
+---------------------------------------------------------------------+------------+------------+
| BUG:sleeping_function_called_from_invalid_context_at_lib/vsprintf.c | 0 | 12 |
+---------------------------------------------------------------------+------------+------------+
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@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202603191629.80fc4e2b-lkp@intel.com
[ 103.203896][ T6289] BUG: sleeping function called from invalid context at lib/vsprintf.c:866
[ 103.218966][ T6289] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6289, name: trinity-c6
[ 103.270174][ T6289] preempt_count: 2, expected: 0
[ 103.288514][ T6289] RCU nest depth: 0, expected: 0
[ 103.310869][ T6289] CPU: 1 UID: 65534 PID: 6289 Comm: trinity-c6 Not tainted 7.0.0-rc4-00006-ga3aa148a2035 #1 PREEMPT(lazy)
[ 103.310904][ T6289] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 103.310929][ T6289] Call Trace:
[ 103.311096][ T6289] <TASK>
[ 103.311126][ T6289] dump_stack_lvl (lib/dump_stack.c:123)
[ 103.311160][ T6289] __might_resched (kernel/sched/core.c:8889)
[ 103.311196][ T6289] restricted_pointer (include/linux/kernel.h:58 lib/vsprintf.c:866)
[ 103.311228][ T6289] pointer (lib/vsprintf.c:2624)
[ 103.311261][ T6289] ? vsnprintf (lib/vsprintf.c:?)
[ 103.311295][ T6289] vsnprintf (lib/vsprintf.c:2955)
[ 103.311327][ T6289] seq_vprintf (fs/seq_file.c:393)
[ 103.311359][ T6289] seq_printf (fs/seq_file.c:409)
[ 103.311388][ T6289] ? rep_movs_alternative (arch/x86/lib/copy_user_64.S:46)
[ 103.311423][ T6289] unix_seq_show (net/unix/af_unix.c:3540)
[ 103.311458][ T6289] seq_read_iter (fs/seq_file.c:273)
[ 103.311491][ T6289] seq_read (fs/seq_file.c:164)
[ 103.311524][ T6289] proc_reg_read (fs/proc/inode.c:308 fs/proc/inode.c:320)
[ 103.311580][ T6289] vfs_read (fs/read_write.c:572)
[ 103.311611][ T6289] ? do_setitimer (include/linux/spinlock.h:?)
[ 103.311643][ T6289] ksys_read (fs/read_write.c:717)
[ 103.311674][ T6289] do_syscall_64 (arch/x86/entry/syscall_64.c:?)
[ 103.311708][ T6289] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 103.311739][ T6289] RIP: 0033:0x453b29
[ 103.311749][ T6289] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b 84 00 00 c3 66 2e 0f 1f 84 00 00 00 00
All code
========
0: 00 f3 add %dh,%bl
2: c3 ret
3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
a: 00 00 00
d: 0f 1f 40 00 nopl 0x0(%rax)
11: 48 89 f8 mov %rdi,%rax
14: 48 89 f7 mov %rsi,%rdi
17: 48 89 d6 mov %rdx,%rsi
1a: 48 89 ca mov %rcx,%rdx
1d: 4d 89 c2 mov %r8,%r10
20: 4d 89 c8 mov %r9,%r8
23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9
28: 0f 05 syscall
2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
30: 0f 83 3b 84 00 00 jae 0x8471
36: c3 ret
37: 66 data16
38: 2e cs
39: 0f .byte 0xf
3a: 1f (bad)
3b: 84 00 test %al,(%rax)
3d: 00 00 add %al,(%rax)
...
Code starting with the faulting instruction
===========================================
0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax
6: 0f 83 3b 84 00 00 jae 0x8447
c: c3 ret
d: 66 data16
e: 2e cs
f: 0f .byte 0xf
10: 1f (bad)
11: 84 00 test %al,(%rax)
13: 00 00 add %al,(%rax)
...
[ 103.311777][ T6289] RSP: 002b:00007ffe20169d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 103.311807][ T6289] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000453b29
[ 103.311812][ T6289] RDX: 0000000000001000 RSI: 00007f14e38d0000 RDI: 00000000000000b6
[ 103.311837][ T6289] RBP: 00007ffe20169de0 R08: 000000000000ffff R09: 23c080ca08458805
[ 103.311842][ T6289] R10: fffffffffffffffd R11: 0000000000000246 R12: 0000000000000002
[ 103.311846][ T6289] R13: 00007f14e41df058 R14: 00000000010a2830 R15: 00007f14e41df000
[ 103.311877][ T6289] </TASK>
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260319/202603191629.80fc4e2b-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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