================================================================== BUG: KASAN: use-after-free in kobject_get+0x113/0x120 lib/kobject.c:663 Read of size 1 at addr ffff88811d98703c by task syz.8.495/2426 CPU: 1 PID: 2426 Comm: syz.8.495 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 kobject_get+0x113/0x120 lib/kobject.c:663 get_device drivers/base/core.c:3361 [inline] device_add+0x331/0xc00 drivers/base/core.c:3191 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1382 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f3a67214159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3a65c6d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f3a6749bfa0 RCX: 00007f3a67214159 RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007f3a672ab06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3a6749c038 R14: 00007f3a6749bfa0 R15: 00007fff3d491e38 Allocated by task 1314: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] device_create_groups_vargs drivers/base/core.c:3942 [inline] device_create+0x13a/0x300 drivers/base/core.c:4002 android_device_create drivers/usb/gadget/configfs.c:1789 [inline] gadgets_make+0x816/0xa70 drivers/usb/gadget/configfs.c:1886 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1382 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88811d987000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 60 bytes inside of 1024-byte region [ffff88811d987000, ffff88811d987400) The buggy address belongs to the page: page:ffffea0004766000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811d981000 pfn:0x11d980 head:ffffea0004766000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea0004934a08 ffffea00045e1e08 ffff888100042f00 raw: ffff88811d981000 0000000000100006 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 0, ts 23009456907, free_ts 23008995982 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1e4/0x310 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 __napi_alloc_skb+0x158/0x2e0 net/core/skbuff.c:522 napi_alloc_skb include/linux/skbuff.h:2977 [inline] page_to_skb+0x40/0x930 drivers/net/virtio_net.c:432 receive_mergeable drivers/net/virtio_net.c:1049 [inline] receive_buf+0xc03/0x46a0 drivers/net/virtio_net.c:1159 virtnet_receive drivers/net/virtio_net.c:1451 [inline] virtnet_poll+0x56b/0xfa0 drivers/net/virtio_net.c:1563 napi_poll net/core/dev.c:6885 [inline] net_rx_action+0x48d/0xed0 net/core/dev.c:6955 __do_softirq+0x255/0x563 kernel/softirq.c:309 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_compound_page+0x73/0x90 mm/page_alloc.c:710 destroy_compound_page include/linux/mm.h:970 [inline] __put_compound_page+0x77/0xb0 mm/swap.c:117 __put_page+0xbd/0xe0 mm/swap.c:133 put_page include/linux/mm.h:1268 [inline] __skb_frag_unref include/linux/skbuff.h:3126 [inline] skb_release_data+0x221/0x690 net/core/skbuff.c:620 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:694 sk_eat_skb include/net/sock.h:2703 [inline] tcp_recvmsg+0x1575/0x2ee0 net/ipv4/tcp.c:2340 inet_recvmsg+0x13a/0x470 net/ipv4/af_inet.c:864 sock_recvmsg_nosec net/socket.c:906 [inline] sock_recvmsg net/socket.c:924 [inline] sock_read_iter+0x2c2/0x380 net/socket.c:997 call_read_iter include/linux/fs.h:2066 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x62a/0xa50 fs/read_write.c:496 ksys_read+0x14a/0x260 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:642 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88811d986f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811d986f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811d987000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811d987080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811d987100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ kobject: '€Lí'ˆ˙˙' (ffff88811d987000): is not initialized, yet kobject_get() is being called. WARNING: CPU: 1 PID: 2426 at lib/kobject.c:666 kobject_get+0x7c/0x120 lib/kobject.c:664 Modules linked in: CPU: 1 PID: 2426 Comm: syz.8.495 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:kobject_get+0x7c/0x120 lib/kobject.c:664 Code: 0a ff 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 d6 3b 45 ff 48 8b 33 48 c7 c7 80 a6 41 85 48 89 da e8 04 8d 1f 02 <0f> 0b eb 0c e8 eb ba 0a ff eb 4c e8 e4 ba 0a ff 4c 8d 73 38 4c 89 RSP: 0018:ffffc90000be7970 EFLAGS: 00010246 RAX: 766f8cb4cd992a00 RBX: ffff88811d987000 RCX: 0000000000080000 RDX: ffffc90000f41000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90000be7988 R08: ffff8881f7152fbf R09: 1ffff1103ee2a5f7 R10: dffffc0000000000 R11: ffffed103ee2a5f8 R12: 0000000000000000 R13: ffff88811c740868 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f3a65c6d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffca508da48 CR3: 00000001087b1000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_device drivers/base/core.c:3361 [inline] device_add+0x331/0xc00 drivers/base/core.c:3191 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1382 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f3a67214159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3a65c6d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f3a6749bfa0 RCX: 00007f3a67214159 RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007f3a672ab06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3a6749c038 R14: 00007f3a6749bfa0 R15: 00007fff3d491e38 ---[ end trace e66dcb4fa047acf1 ]--- ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 2426 at lib/refcount.c:25 refcount_warn_saturate+0x104/0x1a0 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 2426 Comm: syz.8.495 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:refcount_warn_saturate+0x104/0x1a0 lib/refcount.c:25 Code: 04 01 48 c7 c7 00 54 40 85 e8 d8 60 3b 02 0f 0b eb df e8 bf 8e 26 ff c6 05 6d 73 82 04 01 48 c7 c7 40 53 40 85 e8 bc 60 3b 02 <0f> 0b eb c3 e8 a3 8e 26 ff c6 05 52 73 82 04 01 48 c7 c7 a0 53 40 RSP: 0018:ffffc90000be7950 EFLAGS: 00010246 RAX: 766f8cb4cd992a00 RBX: 0000000000000002 RCX: 0000000000080000 RDX: ffffc90000f41000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90000be7960 R08: ffff8881f7052fbf R09: 1ffff1103ee0a5f7 R10: dffffc0000000000 R11: ffffed103ee0a5f8 R12: 0000000000000000 R13: ffff88811c740868 R14: 0000000000000002 R15: 0000000000000000 FS: 00007f3a65c6d6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffca508a9e8 CR3: 00000001087b1000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_add include/linux/refcount.h:-1 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] kref_get include/linux/kref.h:45 [inline] kobject_get+0xfb/0x120 lib/kobject.c:667 get_device drivers/base/core.c:3361 [inline] device_add+0x331/0xc00 drivers/base/core.c:3191 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1382 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f3a67214159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3a65c6d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f3a6749bfa0 RCX: 00007f3a67214159 RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007f3a672ab06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3a6749c038 R14: 00007f3a6749bfa0 R15: 00007fff3d491e38 ---[ end trace e66dcb4fa047acf2 ]--- general protection fault, probably for non-canonical address 0xe6c642864a840b6f: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x3632343254205b78-0x3632343254205b7f] CPU: 1 PID: 2426 Comm: syz.8.495 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:kobj_child_ns_ops lib/kobject.c:1084 [inline] RIP: 0010:kobj_ns_ops lib/kobject.c:1092 [inline] RIP: 0010:kobject_namespace lib/kobject.c:30 [inline] RIP: 0010:create_dir lib/kobject.c:89 [inline] RIP: 0010:kobject_add_internal+0x5e3/0xde0 lib/kobject.c:263 Code: 4c 89 e7 e8 af 1e 45 ff 4d 8b 24 24 4d 85 e4 0f 84 db 00 00 00 49 83 c4 20 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 7f 1e 45 ff 49 8b 04 24 48 85 c0 0f RSP: 0018:ffffc90000be77d8 EFLAGS: 00010207 RAX: 06c646864a840b6f RBX: ffff88810b70b700 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811d987028 RBP: ffffc90000be7830 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200017ceec R12: 3632343254205b7d R13: ffff88810b70b718 R14: ffffffff8681cea0 R15: ffff88811d987000 FS: 00007f3a65c6d6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffca508a9e8 CR3: 00000001087b1000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kobject_add_varg lib/kobject.c:398 [inline] kobject_add+0x165/0x230 lib/kobject.c:450 class_dir_create_and_add drivers/base/core.c:2825 [inline] get_device_parent+0x3a6/0x410 drivers/base/core.c:2880 device_add+0x349/0xc00 drivers/base/core.c:3192 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1382 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f3a67214159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3a65c6d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f3a6749bfa0 RCX: 00007f3a67214159 RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007f3a672ab06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3a6749c038 R14: 00007f3a6749bfa0 R15: 00007fff3d491e38 Modules linked in: ---[ end trace e66dcb4fa047acf3 ]--- RIP: 0010:kobj_child_ns_ops lib/kobject.c:1084 [inline] RIP: 0010:kobj_ns_ops lib/kobject.c:1092 [inline] RIP: 0010:kobject_namespace lib/kobject.c:30 [inline] RIP: 0010:create_dir lib/kobject.c:89 [inline] RIP: 0010:kobject_add_internal+0x5e3/0xde0 lib/kobject.c:263 Code: 4c 89 e7 e8 af 1e 45 ff 4d 8b 24 24 4d 85 e4 0f 84 db 00 00 00 49 83 c4 20 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 7f 1e 45 ff 49 8b 04 24 48 85 c0 0f RSP: 0018:ffffc90000be77d8 EFLAGS: 00010207 RAX: 06c646864a840b6f RBX: ffff88810b70b700 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811d987028 RBP: ffffc90000be7830 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200017ceec R12: 3632343254205b7d R13: ffff88810b70b718 R14: ffffffff8681cea0 R15: ffff88811d987000 FS: 00007f3a65c6d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa57af82fe0 CR3: 00000001087b1000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 4c 89 e7 mov %r12,%rdi 3: e8 af 1e 45 ff call 0xff451eb7 8: 4d 8b 24 24 mov (%r12),%r12 c: 4d 85 e4 test %r12,%r12 f: 0f 84 db 00 00 00 je 0xf0 15: 49 83 c4 20 add $0x20,%r12 19: 4c 89 e0 mov %r12,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 7f 1e 45 ff call 0xff451eb7 38: 49 8b 04 24 mov (%r12),%rax 3c: 48 85 c0 test %rax,%rax 3f: 0f .byte 0xf