kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 11609 Comm: syz-executor.0 Not tainted 5.4.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sg_alloc_table_from_pages lib/scatterlist.c:424 [inline]
RIP: 0010:__sg_alloc_table_from_pages+0x1aa/0x670 lib/scatterlist.c:389
Code: d0 03 00 00 48 8b 5d b8 8b 7d c4 3b 7b 0c 0f 83 9a fe ff ff 48 8b 5d d0 45 8d 70 01 44 89 c1 48 8d 1c cb 48 89 d9 48 c1 e9 03 <80> 3c 01 00 0f 85 10 03 00 00 45 39 f2 4c 8b 1b 0f 86 a4 01 00 00
RSP: 0018:ffff888087167b10 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000000002
RDX: 0000160000000000 RSI: ffff8880b2ffe300 RDI: 0000000000000000
RBP: ffff888087167b98 R08: 0000000000000000 R09: 00000000fffff000
R10: 0000000000000000 R11: ffff8880b2ffe31f R12: ffff8880b2ffe9c0
R13: ffff8880ac596000 R14: 0000000000000001 R15: ffff8880b2ffe9d0
FS:  00007fd8213db700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f37032bb718 CR3: 00000000ad592000 CR4: 0000000000340ee0
Call Trace:
 sg_alloc_table_from_pages+0x11/0x20 lib/scatterlist.c:468
 get_sg_table+0xdd/0x300 drivers/dma-buf/udmabuf.c:61
 begin_cpu_udmabuf+0x1ce/0x2f0 drivers/dma-buf/udmabuf.c:121
 dma_buf_begin_cpu_access+0x6f/0x100 drivers/dma-buf/dma-buf.c:996
 dma_buf_ioctl+0x181/0x420 drivers/dma-buf/dma-buf.c:386
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696
 ksys_ioctl+0x62/0x90 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718
 do_syscall_64+0x9d/0x550 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd821ca68d9
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:00007fd8213db188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd821dab0e0 RCX: 00007fd821ca68d9
RDX: 0000000020000000 RSI: 0000000040086200 RDI: 0000000000000004
RBP: 00007fd821d00cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffed25eb65f R14: 00007fd8213db300 R15: 0000000000022000
Modules linked in:
---[ end trace 6605fa7f4df0f805 ]---
RIP: 0010:__sg_alloc_table_from_pages lib/scatterlist.c:424 [inline]
RIP: 0010:__sg_alloc_table_from_pages+0x1aa/0x670 lib/scatterlist.c:389
Code: d0 03 00 00 48 8b 5d b8 8b 7d c4 3b 7b 0c 0f 83 9a fe ff ff 48 8b 5d d0 45 8d 70 01 44 89 c1 48 8d 1c cb 48 89 d9 48 c1 e9 03 <80> 3c 01 00 0f 85 10 03 00 00 45 39 f2 4c 8b 1b 0f 86 a4 01 00 00
RSP: 0018:ffff888087167b10 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000000002
RDX: 0000160000000000 RSI: ffff8880b2ffe300 RDI: 0000000000000000
RBP: ffff888087167b98 R08: 0000000000000000 R09: 00000000fffff000
R10: 0000000000000000 R11: ffff8880b2ffe31f R12: ffff8880b2ffe9c0
R13: ffff8880ac596000 R14: 0000000000000001 R15: ffff8880b2ffe9d0
FS:  00007fd8213db700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564452972160 CR3: 00000000ad592000 CR4: 0000000000340ee0
----------------
Code disassembly (best guess):
   0:	d0 03                	rolb   (%rbx)
   2:	00 00                	add    %al,(%rax)
   4:	48 8b 5d b8          	mov    -0x48(%rbp),%rbx
   8:	8b 7d c4             	mov    -0x3c(%rbp),%edi
   b:	3b 7b 0c             	cmp    0xc(%rbx),%edi
   e:	0f 83 9a fe ff ff    	jae    0xfffffeae
  14:	48 8b 5d d0          	mov    -0x30(%rbp),%rbx
  18:	45 8d 70 01          	lea    0x1(%r8),%r14d
  1c:	44 89 c1             	mov    %r8d,%ecx
  1f:	48 8d 1c cb          	lea    (%rbx,%rcx,8),%rbx
  23:	48 89 d9             	mov    %rbx,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1) <-- trapping instruction
  2e:	0f 85 10 03 00 00    	jne    0x344
  34:	45 39 f2             	cmp    %r14d,%r10d
  37:	4c 8b 1b             	mov    (%rbx),%r11
  3a:	0f 86 a4 01 00 00    	jbe    0x1e4