general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 8112 Comm: syz-executor.4 Not tainted 6.1.0-rc2-next-20221028 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:strchr+0x17/0xc0
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 53 48 c1 ea 03 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 59 0f b6 07 89
RSP: 0018:ffff888041ed7ad0 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 1ffff110083daf77 RCX: ffffc900083d5000
RDX: 0000000000000000 RSI: 000000000000003a RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000009
R10: 0000000000000003 R11: 0000000000000001 R12: 1ffff110083daf62
R13: 0000000000000000 R14: ffff888034f56a90 R15: dffffc0000000000
FS:  00007f6651dbf700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6651dc0000 CR3: 0000000041042000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mpol_parse_str+0x78/0xb00
 shmem_parse_one+0x67a/0xb70
 vfs_parse_fs_param+0x204/0x3d0
 vfs_parse_fs_string+0xdb/0x190
 shmem_parse_options+0x160/0x260
 path_mount+0x12c8/0x1e30
 __x64_sys_mount+0x282/0x310
 do_syscall_64+0x3b/0xa0
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f665484b04a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6651dbefa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f665484b04a
RDX: 0000000020000280 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 00007f6651dbf040 R08: 00007f6651dbf040 R09: 0000000020000280
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000280
R13: 00000000200002c0 R14: 00007f6651dbf000 R15: 0000000020000600
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strchr+0x17/0xc0
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 53 48 c1 ea 03 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 59 0f b6 07 89
RSP: 0018:ffff888041ed7ad0 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 1ffff110083daf77 RCX: ffffc900083d5000
RDX: 0000000000000000 RSI: 000000000000003a RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000009
R10: 0000000000000003 R11: 0000000000000001 R12: 1ffff110083daf62
R13: 0000000000000000 R14: ffff888034f56a90 R15: dffffc0000000000
FS:  00007f6651dbf700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6651dc0000 CR3: 0000000041042000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#2] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 8115 Comm: syz-executor.4 Tainted: G      D            6.1.0-rc2-next-20221028 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:strchr+0x17/0xc0
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 53 48 c1 ea 03 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 59 0f b6 07 89
RSP: 0018:ffff88801e687ad0 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 1ffff11003cd0f77 RCX: ffffc900085d6000
RDX: 0000000000000000 RSI: 000000000000003a RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000009
R10: 0000000000000003 R11: 0000000000000001 R12: 1ffff11003cd0f62
R13: 0000000000000000 R14: ffff88800d7b7890 R15: dffffc0000000000
FS:  00007f6651d9e700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6651d9f000 CR3: 0000000041042000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mpol_parse_str+0x78/0xb00
 shmem_parse_one+0x67a/0xb70
 vfs_parse_fs_param+0x204/0x3d0
 vfs_parse_fs_string+0xdb/0x190
 shmem_parse_options+0x160/0x260
 path_mount+0x12c8/0x1e30
 __x64_sys_mount+0x282/0x310
 do_syscall_64+0x3b/0xa0
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f665484b04a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6651d9dfa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f665484b04a
RDX: 0000000020000280 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 00007f6651d9e040 R08: 00007f6651d9e040 R09: 0000000020000280
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000280
R13: 00000000200002c0 R14: 00007f6651d9e000 R15: 0000000020000600
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strchr+0x17/0xc0
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 53 48 c1 ea 03 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 59 0f b6 07 89
RSP: 0018:ffff888041ed7ad0 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 1ffff110083daf77 RCX: ffffc900083d5000
RDX: 0000000000000000 RSI: 000000000000003a RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000009
R10: 0000000000000003 R11: 0000000000000001 R12: 1ffff110083daf62
R13: 0000000000000000 R14: ffff888034f56a90 R15: dffffc0000000000
FS:  00007f6651d9e700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6651d9f000 CR3: 0000000041042000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1a:	fc ff df
  1d:	55                   	push   %rbp
  1e:	48 89 fa             	mov    %rdi,%rdx
  21:	53                   	push   %rbx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	48 83 ec 10          	sub    $0x10,%rsp
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	48 89 fa             	mov    %rdi,%rdx
  31:	83 e2 07             	and    $0x7,%edx
  34:	38 d0                	cmp    %dl,%al
  36:	7f 04                	jg     0x3c
  38:	84 c0                	test   %al,%al
  3a:	75 59                	jne    0x95
  3c:	0f b6 07             	movzbl (%rdi),%eax
  3f:	89                   	.byte 0x89