【syzkaller】 general protection fault in update_cpumask

RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000005cbf8c
R13: 000000000000000b R14: 00000000005cbf80 R15: 00007f170edb0000
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 2 PID: 3810 Comm: syz-executor.0 Not tainted 6.6.0+ #7
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:alloc_cpumasks kernel/cgroup/cpuset.c:678 [inline]
RIP: 0010:update_cpumask+0x11f7/0x1570 kernel/cgroup/cpuset.c:2479
Code: 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 79 03 00 00 b8 05 00 00 00 e9 7f f3 ff ff e8 43 8b 04 00 48 b8 00 00 00 00 00 fc ff df <80> 38 00 0f 85 d9 02 00 00 48 8b 3c 25 00 00 00 00 e8 33 a8 22 0d
RSP: 0018:ffff8881128bfab0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88810d7c1800 RCX: ffffffff90ce480d
RDX: 0000000000040000 RSI: ffffc90003905000 RDI: 0000000000000001
RBP: ffffffffa58dcab0 R08: 0000000000000001 R09: fffffbfff46d947a
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88811288c800
R13: 0000000020b5c701 R14: 00000000152c4700 R15: 0000000000000000
FS:  00007f170edd06c0(0000) GS:ffff888118900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f170edcffe0 CR3: 000000011255c001 CR4: 0000000000772ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 cpuset_write_resmask+0x5d6/0x800 kernel/cgroup/cpuset.c:3638
 cgroup_file_write+0x202/0x660 kernel/cgroup/cgroup.c:4164
 kernfs_fop_write_iter+0x364/0x580 fs/kernfs/file.c:338
 call_write_iter include/linux/fs.h:2073 [inline]
 new_sync_write+0x1b1/0x2d0 fs/read_write.c:493
 vfs_write+0x70e/0x950 fs/read_write.c:586
 ksys_write+0x12e/0x260 fs/read_write.c:639
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
RIP: 0033:0x4455ad
Code: 48 83 c8 ff c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f170edd00d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000005cbf80 RCX: 00000000004455ad
RDX: 0000000000000020 RSI: 00000000200020c0 RDI: 0000000000000003
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000005cbf8c
R13: 000000000000000b R14: 00000000005cbf80 R15: 00007f170edb0000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:alloc_cpumasks kernel/cgroup/cpuset.c:678 [inline]
RIP: 0010:update_cpumask+0x11f7/0x1570 kernel/cgroup/cpuset.c:2479
Code: 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 79 03 00 00 b8 05 00 00 00 e9 7f f3 ff ff e8 43 8b 04 00 48 b8 00 00 00 00 00 fc ff df <80> 38 00 0f 85 d9 02 00 00 48 8b 3c 25 00 00 00 00 e8 33 a8 22 0d
RSP: 0018:ffff8881128bfab0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88810d7c1800 RCX: ffffffff90ce480d
RDX: 0000000000040000 RSI: ffffc90003905000 RDI: 0000000000000001
RBP: ffffffffa58dcab0 R08: 0000000000000001 R09: fffffbfff46d947a
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88811288c800
R13: 0000000020b5c701 R14: 00000000152c4700 R15: 0000000000000000
FS:  00007f170edd06c0(0000) GS:ffff888118900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f170edcffe0 CR3: 000000011255c001 CR4: 0000000000772ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
----------------
Code disassembly (best guess):
   0:	03 0f                	add    (%rdi),%ecx
   2:	b6 04                	mov    $0x4,%dh
   4:	02 84 c0 74 08 3c 03 	add    0x33c0874(%rax,%rax,8),%al
   b:	0f 8e 79 03 00 00    	jle    0x38a
  11:	b8 05 00 00 00       	mov    $0x5,%eax
  16:	e9 7f f3 ff ff       	jmp    0xfffff39a
  1b:	e8 43 8b 04 00       	call   0x48b63
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	80 38 00             	cmpb   $0x0,(%rax) <-- trapping instruction
  2d:	0f 85 d9 02 00 00    	jne    0x30c
  33:	48 8b 3c 25 00 00 00 	mov    0x0,%rdi
  3a:	00
  3b:	e8 33 a8 22 0d       	call   0xd22a873

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