BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 1b041a067 P4D 1b041a067 PUD 1caf57067 PMD 0 Oops: 0010 [#1] SMP KASAN CPU: 1 PID: 26512 Comm: syz-executor7 Not tainted 4.18.0-rc4-next-20180712+ #5 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff8801a957e9a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90001e34000 RDX: 1ffff10039868e56 RSI: ffff8801a957ec20 RDI: ffff8801cc3472b0 RBP: ffff8801a957eb90 R08: ffff8801c99aa440 R09: ffffed003981c8c0 R10: ffffed003981c8c0 R11: ffff8801cc0e4607 R12: ffff8801a957ec20 R13: ffff8801cc3472b0 R14: ffff8801cc3472d8 R15: 0000000000000080 FS: 00007f12a8407700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001b297f000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shrink_slab_memcg mm/vmscan.c:598 [inline] shrink_slab+0x861/0xa60 mm/vmscan.c:671 shrink_node+0x429/0x16a0 mm/vmscan.c:2735 shrink_zones mm/vmscan.c:2964 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3324 memory_high_write+0x283/0x310 mm/memcontrol.c:5611 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3502 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x117/0x9d0 fs/read_write.c:485 __kernel_write+0x10c/0x370 fs/read_write.c:506 write_pipe_buf+0x181/0x240 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x38e/0x7c0 fs/splice.c:627 splice_from_pipe+0x1ea/0x340 fs/splice.c:662 default_file_splice_write+0x3c/0x90 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1019 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/0xe20 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1487 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455e29 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f12a8406c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f12a84076d4 RCX: 0000000000455e29 RDX: 0000000020000040 RSI: 0000000000000016 RDI: 0000000000000016 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c1113 R14: 00000000004d1540 R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) CR2: 0000000000000000 ---[ end trace 163e0fbe410a32c7 ]--- RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff8801a957e9a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90001e34000 RDX: 1ffff10039868e56 RSI: ffff8801a957ec20 RDI: ffff8801cc3472b0 RBP: ffff8801a957eb90 R08: ffff8801c99aa440 R09: ffffed003981c8c0 R10: ffffed003981c8c0 R11: ffff8801cc0e4607 R12: ffff8801a957ec20 R13: ffff8801cc3472b0 R14: ffff8801cc3472d8 R15: 0000000000000080 FS: 00007f12a8407700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001b297f000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400