BUG: kernel NULL pointer dereference, address: 0000000000000134
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 3cd2b067 P4D 3cd2b067 PUD 3cd2a067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 23827 Comm: syz-executor.0 Not tainted 5.6.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x28/0x140 mm/kasan/quarantine.c:167
Code: d6 90 41 57 41 56 41 55 41 54 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 <49> 63 86 34 01 00 00 4c 8b 23 48 29 c3 48 83 3d 2b c3 c4 07 00 0f
RSP: 0018:ffffc90005747838 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff813345ba RDI: 0000000000000007
RBP: 0000000000000000 R08: ffff88805a220080 R09: fffffbfff180e786
R10: fffffbfff180e785 R11: ffffffff8c073c2f R12: ffff888000000000
R13: ffffc90005747870 R14: 0000000000000000 R15: 0000000000000282
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5d0cb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000134 CR3: 0000000097e6c000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x159/0x190 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0x97/0xd0 mm/kasan/common.c:496
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 __do_kmalloc mm/slab.c:3654 [inline]
 __kmalloc+0x14b/0x7a0 mm/slab.c:3665
 kmalloc_array include/linux/slab.h:597 [inline]
 kcalloc include/linux/slab.h:608 [inline]
 iter_file_splice_write+0x168/0xb00 fs/splice.c:702
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1037
 splice_direct_to_actor+0x38c/0x980 fs/splice.c:992
 do_splice_direct+0x1a8/0x270 fs/splice.c:1080
 do_sendfile+0x549/0xc40 fs/read_write.c:1520
 __do_compat_sys_sendfile fs/read_write.c:1596 [inline]
 __se_compat_sys_sendfile fs/read_write.c:1585 [inline]
 __ia32_compat_sys_sendfile+0x159/0x220 fs/read_write.c:1585
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Modules linked in:
CR2: 0000000000000134
---[ end trace 7d2b17098ae9b2b4 ]---
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x28/0x140 mm/kasan/quarantine.c:167
Code: d6 90 41 57 41 56 41 55 41 54 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 <49> 63 86 34 01 00 00 4c 8b 23 48 29 c3 48 83 3d 2b c3 c4 07 00 0f
RSP: 0018:ffffc90005747838 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff813345ba RDI: 0000000000000007
RBP: 0000000000000000 R08: ffff88805a220080 R09: fffffbfff180e786
R10: fffffbfff180e785 R11: ffffffff8c073c2f R12: ffff888000000000
R13: ffffc90005747870 R14: 0000000000000000 R15: 0000000000000282
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5d0cb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f5ca9db0 CR3: 0000000097e6c000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400