general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 21924 Comm: syz-executor.2 Not tainted 5.14.0-rc7-next-20210824-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strncpy+0x32/0xb0 lib/string.c:130
Code: 54 55 53 48 83 ec 08 48 85 d2 74 5c 4c 8d 2c 17 48 89 fb 49 bc 00 00 00 00 00 fc ff df 48 89 f0 48 89 f2 48 c1 e8 03 83 e2 07 <42> 0f b6 04 20 38 d0 7f 04 84 c0 75 41 48 89 d8 48 89 da 0f b6 2e
RSP: 0018:ffffc9000aacfb98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc9000aacfc70 RCX: ffffc9000db53000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000aacfc70
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffc9000aacfcb7
R10: ffffffff817c66f5 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc9000aacfc90 R14: ffffc9000aacfc70 R15: ffffc9000aacfc94
FS:  00007fc8eacb9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc8eac98718 CR3: 00000000789b1000 CR4: 00000000001506f0
Call Trace:
 strncpy include/linux/fortify-string.h:59 [inline]
 do_blk_trace_setup+0x113/0xcd0 kernel/trace/blktrace.c:485
 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:589
 blk_trace_setup+0x43/0x60 kernel/trace/blktrace.c:607
 sg_ioctl_common drivers/scsi/sg.c:1122 [inline]
 sg_ioctl+0x252/0x2760 drivers/scsi/sg.c:1164
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc8eacb9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 00000000200003c0 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffd96999bff R14: 00007fc8eacb9300 R15: 0000000000022000
Modules linked in:
---[ end trace c4bae37bb5d91698 ]---
RIP: 0010:strncpy+0x32/0xb0 lib/string.c:130
Code: 54 55 53 48 83 ec 08 48 85 d2 74 5c 4c 8d 2c 17 48 89 fb 49 bc 00 00 00 00 00 fc ff df 48 89 f0 48 89 f2 48 c1 e8 03 83 e2 07 <42> 0f b6 04 20 38 d0 7f 04 84 c0 75 41 48 89 d8 48 89 da 0f b6 2e
RSP: 0018:ffffc9000aacfb98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc9000aacfc70 RCX: ffffc9000db53000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000aacfc70
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffc9000aacfcb7
R10: ffffffff817c66f5 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc9000aacfc90 R14: ffffc9000aacfc70 R15: ffffc9000aacfc94
FS:  00007fc8eacb9700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001ae5848 CR3: 00000000789b1000 CR4: 00000000001506e0
----------------
Code disassembly (best guess):
   0:	54                   	push   %rsp
   1:	55                   	push   %rbp
   2:	53                   	push   %rbx
   3:	48 83 ec 08          	sub    $0x8,%rsp
   7:	48 85 d2             	test   %rdx,%rdx
   a:	74 5c                	je     0x68
   c:	4c 8d 2c 17          	lea    (%rdi,%rdx,1),%r13
  10:	48 89 fb             	mov    %rdi,%rbx
  13:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  1a:	fc ff df
  1d:	48 89 f0             	mov    %rsi,%rax
  20:	48 89 f2             	mov    %rsi,%rdx
  23:	48 c1 e8 03          	shr    $0x3,%rax
  27:	83 e2 07             	and    $0x7,%edx
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	38 d0                	cmp    %dl,%al
  31:	7f 04                	jg     0x37
  33:	84 c0                	test   %al,%al
  35:	75 41                	jne    0x78
  37:	48 89 d8             	mov    %rbx,%rax
  3a:	48 89 da             	mov    %rbx,%rdx
  3d:	0f b6 2e             	movzbl (%rsi),%ebp