BUG: unable to handle kernel NULL pointer dereference at 0000000062f76c2c IP: qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163 PGD 1d142c067 P4D 1d142c067 PUD 1d36ab067 PMD 0 Oops: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 3812 Comm: kworker/u4:5 Not tainted 4.15.0-rc2+ #116 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound call_usermodehelper_exec_work task: 0000000086da39ca task.stack: 000000008ceadbc0 RIP: 0010:qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163 RSP: 0018:ffff8801d8d8e728 EFLAGS: 00010246 RAX: ffffffff85156dd5 RBX: 0000000000000286 RCX: 0000000000000000 RDX: ffffea0000145580 RSI: ffffea000014559f RDI: 0000000000000286 RBP: ffff8801d8d8e760 R08: 1ffff1003b1b1cb3 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff85156dd5 R15: ffffffff85ecb440 FS: 0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000104 CR3: 00000001acd38000 CR4: 00000000001406f0 Call Trace: quarantine_reduce+0x141/0x170 mm/kasan/quarantine.c:259 kasan_kmalloc+0xca/0xe0 mm/kasan/kasan.c:536 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3385 [inline] kmem_cache_alloc+0x11b/0x760 mm/slab.c:3545 dup_fd+0x110/0xdf0 fs/file.c:285 copy_files kernel/fork.c:1301 [inline] copy_process.part.36+0x1f74/0x4ae0 kernel/fork.c:1741 copy_process kernel/fork.c:1566 [inline] _do_fork+0x1ef/0xff0 kernel/fork.c:2045 kernel_thread+0x34/0x40 kernel/fork.c:2107 call_usermodehelper_exec_sync kernel/umh.c:123 [inline] call_usermodehelper_exec_work+0xfe/0x2c0 kernel/umh.c:175 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2112 worker_thread+0x223/0x1990 kernel/workqueue.c:2246 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441 Code: 55 48 89 e5 41 57 41 56 41 55 41 54 49 c7 c7 40 b4 ec 85 53 49 89 f4 48 83 ec 10 48 89 7d c8 4d 85 e4 4d 89 e5 0f 84 c8 00 00 00 <49> 63 95 04 01 00 00 4c 8b 30 48 29 d0 49 83 3f 00 48 89 c6 0f RIP: qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163 RSP: ffff8801d8d8e728 CR2: 0000000000000104 ---[ end trace 3cb2b3b341ad93ab ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..