linux-kernel - Re: [PATCH v4 5/5] io_uring: avoid uring_lock for IORING_SETUP_SINGLE

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Message-ID: <202512101405.a7a2bdb2-lkp@intel.com>
Date: Wed, 10 Dec 2025 14:20:28 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Caleb Sander Mateos <csander@...estorage.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <io-uring@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>, <linux-kernel@...r.kernel.org>, "Caleb Sander
 Mateos" <csander@...estorage.com>, <syzbot@...kaller.appspotmail.com>,
	<oliver.sang@...el.com>
Subject: Re: [PATCH v4 5/5] io_uring: avoid uring_lock for
 IORING_SETUP_SINGLE_ISSUER



Hello,

kernel test robot noticed "Oops:general_protection_fault,probably_for_non-canonical_address#:#[##]KASAN" on:

commit: a924e7ffd1b0b2e015ed1174662d52053a2339c4 ("[PATCH v4 5/5] io_uring: avoid uring_lock for IORING_SETUP_SINGLE_ISSUER")
url: https://github.com/intel-lab-lkp/linux/commits/Caleb-Sander-Mateos/io_uring-use-release-acquire-ordering-for-IORING_SETUP_R_DISABLED/20251203-004502
base: https://git.kernel.org/cgit/linux/kernel/git/axboe/linux.git for-next
patch link: https://lore.kernel.org/all/20251202164121.3612929-6-csander@purestorage.com/
patch subject: [PATCH v4 5/5] io_uring: avoid uring_lock for IORING_SETUP_SINGLE_ISSUER

in testcase: trinity
version: 
with following parameters:

	runtime: 300s
	group: group-00
	nr_groups: 5



config: x86_64-randconfig-015-20251205
compiler: gcc-14
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G

(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/202512101405.a7a2bdb2-lkp@intel.com


[  617.261968][ T3783] Oops: general protection fault, probably for non-canonical address 0xdffffc00000000f3: 0000 [#1] KASAN
[  617.267361][ T3783] KASAN: null-ptr-deref in range [0x0000000000000798-0x000000000000079f]
[  617.268334][ T3783] CPU: 0 UID: 65534 PID: 3783 Comm: trinity-c0 Not tainted 6.18.0-rc6-00312-ga924e7ffd1b0 #1 PREEMPT(lazy)  f22e3d733e0666690a06b271bf82578b56b40aa3
[  617.269927][ T3783] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  617.271108][ T3783] RIP: 0010:task_work_add (kbuild/src/consumer/kernel/task_work.c:68 (discriminator 2))
[  617.271772][ T3783] Code: 39 25 df fe 67 03 0f 85 8c 01 00 00 e8 1c bd 24 00 4d 8d ac 24 98 07 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 2f 02 00 00 49 89 df 48 8d 44 24 38 4d 8b b4 24
All code
========
   0:	39 25 df fe 67 03    	cmp    %esp,0x367fedf(%rip)        # 0x367fee5
   6:	0f 85 8c 01 00 00    	jne    0x198
   c:	e8 1c bd 24 00       	call   0x24bd2d
  11:	4d 8d ac 24 98 07 00 	lea    0x798(%r12),%r13
  18:	00 
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df 
  23:	4c 89 ea             	mov    %r13,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)		<-- trapping instruction
  2e:	0f 85 2f 02 00 00    	jne    0x263
  34:	49 89 df             	mov    %rbx,%r15
  37:	48 8d 44 24 38       	lea    0x38(%rsp),%rax
  3c:	4d                   	rex.WRB
  3d:	8b                   	.byte 0x8b
  3e:	b4 24                	mov    $0x24,%ah

Code starting with the faulting instruction
===========================================
   0:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   4:	0f 85 2f 02 00 00    	jne    0x239
   a:	49 89 df             	mov    %rbx,%r15
   d:	48 8d 44 24 38       	lea    0x38(%rsp),%rax
  12:	4d                   	rex.WRB
  13:	8b                   	.byte 0x8b
  14:	b4 24                	mov    $0x24,%ah
[  617.273774][ T3783] RSP: 0018:ffff88816ac9fb10 EFLAGS: 00010206
[  617.274486][ T3783] RAX: dffffc0000000000 RBX: ffff88816ac9fbe0 RCX: 0000000000000000
[  617.275413][ T3783] RDX: 00000000000000f3 RSI: 0000000000000000 RDI: 0000000000000000
[  617.276336][ T3783] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
[  617.277257][ T3783] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[  617.278178][ T3783] R13: 0000000000000798 R14: 1ffff1102d593f65 R15: ffff88816ac9fcf0
[  617.279075][ T3783] FS:  00000000010a2880(0000) GS:0000000000000000(0000) knlGS:0000000000000000
[  617.280114][ T3783] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  617.280856][ T3783] CR2: 00000000d684d000 CR3: 000000015f35b000 CR4: 00000000000406f0
[  617.281749][ T3783] Call Trace:
[  617.282202][ T3783]  <TASK>
[  617.282613][ T3783]  ? lockdep_init_map_type (kbuild/src/consumer/kernel/locking/lockdep.c:4973 (discriminator 1))
[  617.283274][ T3783]  ? task_work_set_notify_irq (kbuild/src/consumer/kernel/task_work.c:56)
[  617.283904][ T3783]  ? lockdep_init_map_type (kbuild/src/consumer/kernel/locking/lockdep.c:4973 (discriminator 1))
[  617.284515][ T3783]  ? __init_swait_queue_head (kbuild/src/consumer/include/linux/list.h:45 (discriminator 2) kbuild/src/consumer/kernel/sched/swait.c:12 (discriminator 2))


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251210/202512101405.a7a2bdb2-lkp@intel.com



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