linux-kernel - [syzbot] [kernel?] general protection fault in srcu_invoke

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Date: Tue, 21 May 2024 02:11:33 -0700
From: syzbot <syzbot+dfe85a6b612e19d45a07@...kaller.appspotmail.com>
To: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, 
	linux-kernel@...r.kernel.org, mingo@...hat.com, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: [syzbot] [kernel?] general protection fault in srcu_invoke_callbacks

Hello,

syzbot found the following issue on:

HEAD commit:    eb6a9339efeb Merge tag 'mm-nonmm-stable-2024-05-19-11-56' ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1276c97c980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e2ea586e11acd6ec
dashboard link: https://syzkaller.appspot.com/bug?extid=dfe85a6b612e19d45a07
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-eb6a9339.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/21782c1528d1/vmlinux-eb6a9339.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6c377678e8b1/bzImage-eb6a9339.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dfe85a6b612e19d45a07@...kaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000030: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000180-0x0000000000000187]
CPU: 0 PID: 5282 Comm: kworker/0:4 Not tainted 6.9.0-syzkaller-09699-geb6a9339efeb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: rcu_gp srcu_invoke_callbacks
RIP: 0010:rcu_seq_current kernel/rcu/rcu.h:138 [inline]
RIP: 0010:srcu_invoke_callbacks+0x158/0x490 kernel/rcu/srcutree.c:1732
Code: 48 c1 ea 03 80 3c 02 00 0f 85 02 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 38 48 8d bb 80 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d2 02 00 00 48 8b b3 80 01 00 00 48 8d 85 20 ff
RSP: 0018:ffffc90003c17bf8 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff816d1bfd
RDX: 0000000000000030 RSI: 0000000000000004 RDI: 0000000000000180
RBP: ffffe8ffad054220 R08: 0000000000000001 R09: fffff52000782f71
R10: 0000000000000003 R11: 0000000000000002 R12: 1ffff92000782f83
R13: ffffe8ffad054140 R14: ffffc90003c17c38 R15: ffffc90003c17d80
FS:  0000000000000000(0000) GS:ffff88802c000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3fbc5ffc9 CR3: 0000000053e80000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rcu_seq_current kernel/rcu/rcu.h:138 [inline]
RIP: 0010:srcu_invoke_callbacks+0x158/0x490 kernel/rcu/srcutree.c:1732
Code: 48 c1 ea 03 80 3c 02 00 0f 85 02 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 38 48 8d bb 80 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d2 02 00 00 48 8b b3 80 01 00 00 48 8d 85 20 ff
RSP: 0018:ffffc90003c17bf8 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff816d1bfd
RDX: 0000000000000030 RSI: 0000000000000004 RDI: 0000000000000180
RBP: ffffe8ffad054220 R08: 0000000000000001 R09: fffff52000782f71
R10: 0000000000000003 R11: 0000000000000002 R12: 1ffff92000782f83
R13: ffffe8ffad054140 R14: ffffc90003c17c38 R15: ffffc90003c17d80
FS:  0000000000000000(0000) GS:ffff88802c000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3fbc5ffc9 CR3: 0000000053e80000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 02 03 00 00    	jne    0x310
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	48 8b 5b 38          	mov    0x38(%rbx),%rbx
  1c:	48 8d bb 80 01 00 00 	lea    0x180(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 d2 02 00 00    	jne    0x306
  34:	48 8b b3 80 01 00 00 	mov    0x180(%rbx),%rsi
  3b:	48                   	rex.W
  3c:	8d                   	.byte 0x8d
  3d:	85 20                	test   %esp,(%rax)
  3f:	ff                   	.byte 0xff


---
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