RSP: 002b:00007fff52eac338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2507039cd8 RCX: 00007f2506fb0569
RDX: 0000200000000640 RSI: 00000000c138fd0e RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007fff52ea0039
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2507039cd8
R13: 0000000000000002 R14: 00007f2507039c40 R15: 0000000000000002
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 0 UID: 0 PID: 312 Comm: syz-executor177 Not tainted syzkaller #0 86ffabe033aa4b611dc1eaf9ec72dc67ec78bb97
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:dm_stat_free+0x15e/0x540 drivers/md/dm-stats.c:181
Code: c1 49 89 dd 49 c1 ed 03 43 80 7c 3d 00 00 74 08 48 89 df e8 e4 7a e2 fd 48 89 5d 90 4c 8b 33 49 8d 5e 60 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 c3 7a e2 fd 48 8b 1b 48 8b 45 c0
RSP: 0018:ffffc900012df788 EFLAGS: 00010206
RAX: 000000000000000c RBX: 0000000000000060 RCX: ffff888107b54080
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900012df7f8 R08: 0000000000000020 R09: 1ffffffff0fd764a
R10: dffffc0000000000 R11: fffffbfff0fd764b R12: 0000000000000000
R13: 1ffff11020f6a810 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555672ba3c0(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004697f0 CR3: 0000000104b52000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 dm_stats_create+0x7d5/0x1430 drivers/md/dm-stats.c:432
 message_stats_create drivers/md/dm-stats.c:1105 [inline]
 dm_stats_message+0x1456/0x1f50 drivers/md/dm-stats.c:1227
 message_for_md drivers/md/dm-ioctl.c:1758 [inline]
 target_message+0x301/0x8a0 drivers/md/dm-ioctl.c:1804
 ctl_ioctl drivers/md/dm-ioctl.c:2107 [inline]
 dm_ctl_ioctl+0x8f3/0xde0 drivers/md/dm-ioctl.c:2129
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0x126/0x1b0 fs/ioctl.c:892
 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:892
 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f2506fb0569
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff52eac338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2507039cd8 RCX: 00007f2506fb0569
RDX: 0000200000000640 RSI: 00000000c138fd0e RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007fff52ea0039
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2507039cd8
R13: 0000000000000002 R14: 00007f2507039c40 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dm_stat_free+0x15e/0x540 drivers/md/dm-stats.c:181
Code: c1 49 89 dd 49 c1 ed 03 43 80 7c 3d 00 00 74 08 48 89 df e8 e4 7a e2 fd 48 89 5d 90 4c 8b 33 49 8d 5e 60 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 c3 7a e2 fd 48 8b 1b 48 8b 45 c0
RSP: 0018:ffffc900012df788 EFLAGS: 00010206
RAX: 000000000000000c RBX: 0000000000000060 RCX: ffff888107b54080
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900012df7f8 R08: 0000000000000020 R09: 1ffffffff0fd764a
R10: dffffc0000000000 R11: fffffbfff0fd764b R12: 0000000000000000
R13: 1ffff11020f6a810 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555672ba3c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006a9ee0 CR3: 0000000104b52000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	c1 49 89 dd          	rorl   $0xdd,-0x77(%rcx)
   4:	49 c1 ed 03          	shr    $0x3,%r13
   8:	43 80 7c 3d 00 00    	cmpb   $0x0,0x0(%r13,%r15,1)
   e:	74 08                	je     0x18
  10:	48 89 df             	mov    %rbx,%rdi
  13:	e8 e4 7a e2 fd       	call   0xfde27afc
  18:	48 89 5d 90          	mov    %rbx,-0x70(%rbp)
  1c:	4c 8b 33             	mov    (%rbx),%r14
  1f:	49 8d 5e 60          	lea    0x60(%r14),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 c3 7a e2 fd       	call   0xfde27afc
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 8b 45 c0          	mov    -0x40(%rbp),%rax