BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc PGD 1bed39067 P4D 1bed39067 PUD 1d2f6a067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12567 Comm: udevd Not tainted 4.19.0+ #216 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:qlist_free_all+0x30/0x140 mm/kasan/quarantine.c:163 Code: 41 56 41 55 41 54 53 48 83 ec 08 48 8b 1f 48 85 db 0f 84 b0 00 00 00 49 89 f4 48 89 7d d0 4d 85 e4 4d 89 e7 0f 84 c7 00 00 00 <49> 63 87 fc 00 00 00 4c 8b 33 48 29 c3 48 83 3d 23 28 8f 07 00 49 RSP: 0018:ffff8801bc4bfb10 EFLAGS: 00010246 RAX: ffffea000765ca00 RBX: ffff8801d9728058 RCX: dead0000000000ff RDX: 0000000000000000 RSI: ffffffff8139bd56 RDI: 0000000000000007 RBP: ffff8801bc4bfb40 R08: ffff8801b821e300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8801d9727cc0 R14: ffff8801d9728058 R15: 0000000000000000 FS: 00007fbca051b7a0(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000fc CR3: 00000001d5420000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: quarantine_reduce+0x163/0x1a0 mm/kasan/quarantine.c:259 kasan_kmalloc+0x9b/0xe0 mm/kasan/kasan.c:538 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc mm/slab.c:3392 [inline] kmem_cache_alloc+0x11b/0x730 mm/slab.c:3552 kobject: 'loop2' (00000000a6b7ada1): kobject_uevent_env getname_flags+0xd0/0x590 fs/namei.c:140 user_path_at_empty+0x2d/0x50 fs/namei.c:2608 do_readlinkat+0x156/0x410 fs/stat.c:397 kobject: 'loop2' (00000000a6b7ada1): fill_kobj_path: path = '/devices/virtual/block/loop2' __do_sys_readlink fs/stat.c:430 [inline] __se_sys_readlink fs/stat.c:427 [inline] __x64_sys_readlink+0x78/0xb0 fs/stat.c:427 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fbc9fc24577 Code: f0 ff ff 77 02 f3 c3 48 8b 15 bd 38 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 90 90 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 91 38 2b 00 31 d2 48 29 c2 64 kobject: 'loop5' (0000000001cdd754): kobject_uevent_env RSP: 002b:00007ffc707b32f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 000000000187c250 RCX: 00007fbc9fc24577 RDX: 0000000000000400 RSI: 00007ffc707b3300 RDI: 00007ffc707b37e0 RBP: 00007ffc707b4020 R08: 00007ffc707b4020 R09: 00007fbc9fc791a0 R10: 7665642f7379732f R11: 0000000000000246 R12: 00007ffc707b37e0 R13: 0000000000000400 R14: 000000000187c250 R15: 0000000001881e10 Modules linked in: CR2: 00000000000000fc kobject: 'loop5' (0000000001cdd754): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (000000007cca781a): kobject_uevent_env kobject: 'loop1' (000000007cca781a): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (000000008ed9a3a5): kobject_uevent_env kobject: 'loop0' (000000008ed9a3a5): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000001cdd754): kobject_uevent_env kobject: 'loop5' (0000000001cdd754): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (00000000a6b7ada1): kobject_uevent_env kobject: 'loop2' (00000000a6b7ada1): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (000000007cca781a): kobject_uevent_env kobject: 'loop1' (000000007cca781a): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000c9bcf9c8): kobject_uevent_env kobject: 'loop4' (00000000c9bcf9c8): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (0000000001cdd754): kobject_uevent_env kobject: 'loop5' (0000000001cdd754): fill_kobj_path: path = '/devices/virtual/block/loop5' ---[ end trace f1581ce55bf2e892 ]--- RIP: 0010:qlist_free_all+0x30/0x140 mm/kasan/quarantine.c:163 Code: 41 56 41 55 41 54 53 48 83 ec 08 48 8b 1f 48 85 db 0f 84 b0 00 00 00 49 89 f4 48 89 7d d0 4d 85 e4 4d 89 e7 0f 84 c7 00 00 00 <49> 63 87 fc 00 00 00 4c 8b 33 48 29 c3 48 83 3d 23 28 8f 07 00 49 RSP: 0018:ffff8801bc4bfb10 EFLAGS: 00010246 kobject: 'loop2' (00000000a6b7ada1): kobject_uevent_env RAX: ffffea000765ca00 RBX: ffff8801d9728058 RCX: dead0000000000ff RDX: 0000000000000000 RSI: ffffffff8139bd56 RDI: 0000000000000007 RBP: ffff8801bc4bfb40 R08: ffff8801b821e300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8801d9727cc0 R14: ffff8801d9728058 R15: 0000000000000000 FS: 00007fbca051b7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020b55000 CR3: 00000001d5420000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject: 'loop2' (00000000a6b7ada1): fill_kobj_path: path = '/devices/virtual/block/loop2'