R13: 00007f131c98ef90 R14: 00000000000157d5 R15: 00007ffee9242eb0 ---[ end trace af662ffb2a3d2cc1 ]--- ================================================================== BUG: KASAN: use-after-free in fast_dput+0x1e9/0x290 fs/dcache.c:750 Read of size 4 at addr ffff888110563330 by task syz-executor/277 CPU: 0 PID: 277 Comm: syz-executor Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 fast_dput+0x1e9/0x290 fs/dcache.c:750 dput+0x21/0x80 fs/dcache.c:870 path_put+0x39/0x60 fs/namei.c:499 dentry_release+0x4f/0xa0 fs/incfs/vfs.c:1591 __dentry_kill+0x4b5/0x650 fs/dcache.c:588 shrink_dentry_list+0x38e/0x500 fs/dcache.c:1146 shrink_dcache_parent+0xa9/0x270 fs/dcache.c:-1 do_one_tree+0x27/0x150 fs/dcache.c:1627 shrink_dcache_for_umount+0x6a/0x110 fs/dcache.c:1644 generic_shutdown_super+0x66/0x320 fs/super.c:447 kill_anon_super+0x3a/0x70 fs/super.c:1131 incfs_kill_sb+0x4c/0x210 fs/incfs/vfs.c:1965 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa90/0x2500 kernel/exit.c:872 do_group_exit+0x141/0x310 kernel/exit.c:986 __do_sys_exit_group kernel/exit.c:997 [inline] __se_sys_exit_group kernel/exit.c:995 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:995 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f131c8f9799 Code: Unable to access opcode bytes at RIP 0x7f131c8f976f. RSP: 002b:00007ffee9240b28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f131c98eff0 RCX: 00007f131c8f9799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f131c98ef90 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee9241de0 R13: 00007f131c98ef90 R14: 000055555cc134e8 R15: 00007ffee9242eb0 Allocated by task 828: 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_slab_alloc+0xbd/0xf0 mm/kasan/common.c:463 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x162/0x2d0 mm/slub.c:2965 __d_alloc+0x2d/0x6a0 fs/dcache.c:1714 d_alloc+0x4b/0x260 fs/dcache.c:1793 __lookup_hash+0xcb/0x250 fs/namei.c:1545 filename_create+0x1d5/0x680 fs/namei.c:3616 user_path_create fs/namei.c:3673 [inline] do_mkdirat+0x5e/0x340 fs/namei.c:3813 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 848: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kmem_cache_free+0x100/0x2d0 mm/slub.c:3224 __d_free+0x23/0x30 fs/dcache.c:271 rcu_do_batch+0x4ef/0xab0 kernel/rcu/tree.c:2494 rcu_core+0x577/0xd80 kernel/rcu/tree.c:2735 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748 __do_softirq+0x255/0x563 kernel/softirq.c:309 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2980 [inline] call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054 dentry_free+0xbd/0x150 fs/dcache.c:-1 __dentry_kill+0x50a/0x650 fs/dcache.c:597 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:883 do_rmdir+0x24b/0x630 fs/namei.c:3922 __do_sys_unlinkat fs/namei.c:4084 [inline] __se_sys_unlinkat fs/namei.c:4078 [inline] __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4078 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2980 [inline] call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054 dentry_free+0xbd/0x150 fs/dcache.c:-1 __dentry_kill+0x50a/0x650 fs/dcache.c:597 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:883 proc_invalidate_siblings_dcache+0x2a0/0x3c0 fs/proc/inode.c:151 proc_flush_pid+0x1d/0x20 fs/proc/base.c:3428 release_task+0x10b9/0x1200 kernel/exit.c:270 wait_task_zombie kernel/exit.c:1171 [inline] wait_consider_task+0x1802/0x27d0 kernel/exit.c:1398 do_wait_thread kernel/exit.c:1461 [inline] do_wait+0x244/0x6c0 kernel/exit.c:1532 kernel_wait4+0x1d1/0x2a0 kernel/exit.c:1694 __do_sys_wait4 kernel/exit.c:1722 [inline] __se_sys_wait4 kernel/exit.c:1718 [inline] __x64_sys_wait4+0x163/0x230 kernel/exit.c:1718 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 ffff888110563330 which belongs to the cache dentry of size 208 The buggy address is located 0 bytes inside of 208-byte region [ffff888110563330, ffff888110563400) The buggy address belongs to the page: page:ffffea00044158c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110563 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff88810018bc80 raw: 0000000000000000 00000000000f000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x12cd0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_RECLAIMABLE), pid 103, ts 4116178286, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5370 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+0x2a6/0x450 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] kmem_cache_alloc+0x1ac/0x2d0 mm/slub.c:2965 __d_alloc+0x2d/0x6a0 fs/dcache.c:1714 d_alloc fs/dcache.c:1793 [inline] d_alloc_parallel+0xdf/0x1380 fs/dcache.c:2549 __lookup_slow+0x14c/0x410 fs/namei.c:1633 lookup_slow+0x57/0x70 fs/namei.c:1665 walk_component+0x325/0x460 fs/namei.c:1960 lookup_last fs/namei.c:2411 [inline] path_lookupat+0x180/0x490 fs/namei.c:2435 filename_lookup+0x213/0x6a0 fs/namei.c:2468 user_path_at_empty+0x43/0x50 fs/namei.c:2748 user_path_at include/linux/namei.h:60 [inline] vfs_statx+0x10a/0x530 fs/stat.c:193 page_owner free stack trace missing Memory state around the buggy address: ffff888110563200: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ffff888110563280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff888110563300: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb ^ ffff888110563380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888110563400: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 277 at fs/dcache.c:766 fast_dput+0x210/0x290 fs/dcache.c:766 Modules linked in: CPU: 1 PID: 277 Comm: syz-executor Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:fast_dput+0x210/0x290 fs/dcache.c:766 Code: d5 f2 ff e9 46 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 99 fe ff ff 48 89 df e8 8a d5 f2 ff e9 8c fe ff ff e8 70 54 b8 ff <0f> 0b e9 0b ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e4 fe ff RSP: 0018:ffffc90000bf78f8 EFLAGS: 00010293 RAX: ffffffff81ac61e0 RBX: ffff888110563330 RCX: ffff888125cf3b40 RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001 RBP: ffffc90000bf7928 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200017ef10 R12: 00000000ffffff80 R13: dffffc0000000000 R14: ffff888110563388 R15: 1ffff110220ac671 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000100000 CR3: 000000011d92d000 CR4: 00000000003526a0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dput+0x21/0x80 fs/dcache.c:870 path_put+0x39/0x60 fs/namei.c:499 dentry_release+0x4f/0xa0 fs/incfs/vfs.c:1591 __dentry_kill+0x4b5/0x650 fs/dcache.c:588 shrink_dentry_list+0x38e/0x500 fs/dcache.c:1146 shrink_dcache_parent+0xa9/0x270 fs/dcache.c:-1 do_one_tree+0x27/0x150 fs/dcache.c:1627 shrink_dcache_for_umount+0x6a/0x110 fs/dcache.c:1644 generic_shutdown_super+0x66/0x320 fs/super.c:447 kill_anon_super+0x3a/0x70 fs/super.c:1131 incfs_kill_sb+0x4c/0x210 fs/incfs/vfs.c:1965 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa90/0x2500 kernel/exit.c:872 do_group_exit+0x141/0x310 kernel/exit.c:986 __do_sys_exit_group kernel/exit.c:997 [inline] __se_sys_exit_group kernel/exit.c:995 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:995 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f131c8f9799 Code: Unable to access opcode bytes at RIP 0x7f131c8f976f. RSP: 002b:00007ffee9240b28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f131c98eff0 RCX: 00007f131c8f9799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f131c98ef90 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee9241de0 R13: 00007f131c98ef90 R14: 000055555cc134e8 R15: 00007ffee9242eb0 ---[ end trace af662ffb2a3d2cc2 ]--- ------------[ cut here ]------------ WARNING: CPU: 1 PID: 277 at fs/inode.c:304 drop_nlink+0xc5/0x110 fs/inode.c:304 Modules linked in: CPU: 1 PID: 277 Comm: syz-executor Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:drop_nlink+0xc5/0x110 fs/inode.c:304 Code: 1b 48 8d bb b8 04 00 00 be 08 00 00 00 e8 13 f1 f1 ff f0 48 ff 83 b8 04 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 cb 6d b7 ff <0f> 0b eb 86 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 5e ff ff ff 4c RSP: 0018:ffffc90000bf7b48 EFLAGS: 00010293 RAX: ffffffff81ad4885 RBX: ffff888120981d60 RCX: ffff888125cf3b40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000bf7b70 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200017ef58 R12: dffffc0000000000 R13: 1ffff110241303b5 R14: ffff888120981da8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000100000 CR3: 00000001264b4000 CR4: 00000000003506a0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shmem_rmdir+0x5b/0x90 mm/shmem.c:3011 vfs_rmdir+0x1b3/0x3e0 fs/namei.c:3860 incfs_kill_sb+0xfe/0x210 fs/incfs/vfs.c:1973 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa90/0x2500 kernel/exit.c:872 do_group_exit+0x141/0x310 kernel/exit.c:986 __do_sys_exit_group kernel/exit.c:997 [inline] __se_sys_exit_group kernel/exit.c:995 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:995 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f131c8f9799 Code: Unable to access opcode bytes at RIP 0x7f131c8f976f. RSP: 002b:00007ffee9240b28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f131c98eff0 RCX: 00007f131c8f9799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f131c98ef90 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee9241de0 R13: 00007f131c98ef90 R14: 000055555cc134e8 R15: 00007ffee9242eb0 ---[ end trace af662ffb2a3d2cc3 ]--- BUG: kernel NULL pointer dereference, address: 0000000000000170 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 277 Comm: syz-executor Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline] RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline] RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline] RIP: 0010:ihold+0x26/0x60 fs/inode.c:423 Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 e1 65 b7 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 00 e9 f1 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 61 RSP: 0018:ffffc90000bf7b88 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000282 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170 RBP: ffffc90000bf7b98 R08: 0000000000000000 R09: 1ffff110220c3da3 R10: dffffc0000000000 R11: ffffed10220c3da4 R12: 1ffff110220ac628 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 000000010d645000 CR4: 00000000003506a0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_delete_notify include/linux/fsnotify.h:264 [inline] vfs_rmdir+0x247/0x3e0 fs/namei.c:3873 incfs_kill_sb+0xfe/0x210 fs/incfs/vfs.c:1973 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa90/0x2500 kernel/exit.c:872 do_group_exit+0x141/0x310 kernel/exit.c:986 __do_sys_exit_group kernel/exit.c:997 [inline] __se_sys_exit_group kernel/exit.c:995 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:995 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f131c8f9799 Code: Unable to access opcode bytes at RIP 0x7f131c8f976f. RSP: 002b:00007ffee9240b28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f131c98eff0 RCX: 00007f131c8f9799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f131c98ef90 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee9241de0 R13: 00007f131c98ef90 R14: 000055555cc134e8 R15: 00007ffee9242eb0 Modules linked in: CR2: 0000000000000170 ---[ end trace af662ffb2a3d2cc4 ]--- RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline] RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline] RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline] RIP: 0010:ihold+0x26/0x60 fs/inode.c:423 Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 e1 65 b7 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 00 e9 f1 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 61 RSP: 0018:ffffc90000bf7b88 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000282 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170 RBP: ffffc90000bf7b98 R08: 0000000000000000 R09: 1ffff110220c3da3 R10: dffffc0000000000 R11: ffffed10220c3da4 R12: 1ffff110220ac628 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 000000010d645000 CR4: 00000000003506a0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 55 push %rbp 5: 48 89 e5 mov %rsp,%rbp 8: 41 56 push %r14 a: 53 push %rbx b: 48 89 fb mov %rdi,%rbx e: e8 e1 65 b7 ff call 0xffb765f4 13: 48 8d bb 70 01 00 00 lea 0x170(%rbx),%rdi 1a: be 04 00 00 00 mov $0x4,%esi 1f: e8 00 e9 f1 ff call 0xfff1e924 24: 41 be 01 00 00 00 mov $0x1,%r14d * 2a: f0 44 0f c1 b3 70 01 lock xadd %r14d,0x170(%rbx) <-- trapping instruction 31: 00 00 33: 41 ff c6 inc %r14d 36: bf 02 00 00 00 mov $0x2,%edi 3b: 44 89 f6 mov %r14d,%esi 3e: e8 .byte 0xe8 3f: 61 (bad)