---[ end trace bb600494001134c1 ]--- ================================================================== BUG: KASAN: use-after-free in fast_dput+0x1e9/0x290 fs/dcache.c:750 Read of size 4 at addr ffff888110145550 by task syz-executor/1244 CPU: 1 PID: 1244 Comm: syz-executor Tainted: G W 5.10.236-syzkaller-00012-gab07aeb2c93d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 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+0xa3/0x250 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+0x446/0x500 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7efc0af04c97 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe7892b5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efc0af04c97 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe7892b690 RBP: 00007ffe7892b690 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe7892c720 R13: 00007efc0af8589d R14: 00000000000383af R15: 00007ffe7892c760 Allocated by task 5794: 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:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2960 __d_alloc+0x2d/0x6a0 fs/dcache.c:1714 d_alloc+0x4b/0x1d0 fs/dcache.c:1793 __lookup_hash+0xcb/0x250 fs/namei.c:1537 filename_create+0x1d4/0x680 fs/namei.c:3608 user_path_create fs/namei.c:3665 [inline] do_mkdirat+0x5e/0x340 fs/namei.c:3805 __do_sys_mkdir fs/namei.c:3828 [inline] __se_sys_mkdir fs/namei.c:3826 [inline] __x64_sys_mkdir+0x60/0x70 fs/namei.c:3826 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 19: 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:1595 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kmem_cache_free+0x100/0x2d0 mm/slub.c:3219 __d_free+0x23/0x30 fs/dcache.c:271 rcu_do_batch+0x4df/0xa80 kernel/rcu/tree.c:2494 rcu_core+0x55f/0xd60 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:2976 [inline] call_rcu+0x105/0x1040 kernel/rcu/tree.c:3050 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+0x235/0x620 fs/namei.c:3914 __do_sys_unlinkat fs/namei.c:4076 [inline] __se_sys_unlinkat fs/namei.c:4070 [inline] __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4070 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:2976 [inline] call_rcu+0x105/0x1040 kernel/rcu/tree.c:3050 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 handle_mounts fs/namei.c:1485 [inline] step_into+0x8f0/0xcf0 fs/namei.c:1782 walk_component+0x26a/0x460 fs/namei.c:1958 lookup_last fs/namei.c:2403 [inline] path_lookupat+0x180/0x490 fs/namei.c:2427 filename_lookup+0x1d5/0x600 fs/namei.c:2460 user_path_at_empty+0x43/0x50 fs/namei.c:2740 user_path_at include/linux/namei.h:60 [inline] do_mount fs/namespace.c:3257 [inline] __do_sys_mount fs/namespace.c:3468 [inline] __se_sys_mount+0x2e3/0x380 fs/namespace.c:3445 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445 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 ffff888110145550 which belongs to the cache dentry of size 208 The buggy address is located 0 bytes inside of 208-byte region [ffff888110145550, ffff888110145620) The buggy address belongs to the page: page:ffffea0004405140 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110145 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff88810018a780 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 8416655221, 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+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5349 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x84/0x3f0 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x1af/0x2e0 mm/slub.c:2960 __d_alloc+0x2d/0x6a0 fs/dcache.c:1714 d_alloc+0x4b/0x1d0 fs/dcache.c:1793 __lookup_hash+0xcb/0x250 fs/namei.c:1537 filename_create+0x1d4/0x680 fs/namei.c:3608 user_path_create fs/namei.c:3665 [inline] do_symlinkat+0x8f/0x3b0 fs/namei.c:4119 __do_sys_symlink fs/namei.c:4145 [inline] __se_sys_symlink fs/namei.c:4143 [inline] __x64_sys_symlink+0x60/0x70 fs/namei.c:4143 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page_owner free stack trace missing Memory state around the buggy address: ffff888110145400: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff888110145480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888110145500: 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb ^ ffff888110145580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888110145600: fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 ================================================================== ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1244 at fs/dcache.c:766 fast_dput+0x210/0x290 fs/dcache.c:766 Modules linked in: CPU: 0 PID: 1244 Comm: syz-executor Tainted: G B W 5.10.236-syzkaller-00012-gab07aeb2c93d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:fast_dput+0x210/0x290 fs/dcache.c:766 Code: 05 f3 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 4a 05 f3 ff e9 8c fe ff ff e8 c0 1e b9 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:ffffc900012e7a98 EFLAGS: 00010293 RAX: ffffffff81aa6df0 RBX: ffff888110145550 RCX: ffff88811c7d0000 RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001 RBP: ffffc900012e7ac8 R08: 0000000000000004 R09: 0000000000000003 R10: fffff5200025cf44 R11: 1ffff9200025cf44 R12: 00000000ffffff80 R13: dffffc0000000000 R14: ffff8881101455a8 R15: 1ffff11022028ab5 FS: 0000555560e01500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000122634000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 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+0xa3/0x250 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+0x446/0x500 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7efc0af04c97 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe7892b5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efc0af04c97 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe7892b690 RBP: 00007ffe7892b690 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe7892c720 R13: 00007efc0af8589d R14: 00000000000383af R15: 00007ffe7892c760 ---[ end trace bb600494001134c2 ]--- ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1244 at fs/inode.c:304 drop_nlink+0xc5/0x110 fs/inode.c:304 Modules linked in: CPU: 0 PID: 1244 Comm: syz-executor Tainted: G B W 5.10.236-syzkaller-00012-gab07aeb2c93d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 a3 23 f2 ff f0 48 ff 83 b8 04 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 eb 3a b8 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:ffffc900012e7ce8 EFLAGS: 00010293 RAX: ffffffff81ab51c5 RBX: ffff88811b7864a0 RCX: ffff88811c7d0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900012e7d10 R08: 0000000000000004 R09: 0000000000000003 R10: fffff5200025cf8c R11: 1ffff9200025cf8c R12: dffffc0000000000 R13: 1ffff110236f0c9d R14: ffff88811b7864e8 R15: 0000000000000000 FS: 0000555560e01500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeb8db5f38 CR3: 0000000122634000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shmem_rmdir+0x5b/0x90 mm/shmem.c:3007 vfs_rmdir+0x1b3/0x3e0 fs/namei.c:3852 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+0x446/0x500 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7efc0af04c97 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe7892b5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efc0af04c97 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe7892b690 RBP: 00007ffe7892b690 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe7892c720 R13: 00007efc0af8589d R14: 00000000000383af R15: 00007ffe7892c760 ---[ end trace bb600494001134c3 ]--- BUG: kernel NULL pointer dereference, address: 0000000000000170 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 119942067 P4D 119942067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 1244 Comm: syz-executor Tainted: G B W 5.10.236-syzkaller-00012-gab07aeb2c93d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 01 33 b8 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 90 1b f2 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 81 RSP: 0018:ffffc900012e7d28 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000286 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170 RBP: ffffc900012e7d38 R08: 0000000000000000 R09: ffffed102205e9c6 R10: ffffed102205e9c6 R11: 1ffff1102205e9c5 R12: 1ffff11022026e4a R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000555560e01500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 0000000122634000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_delete_notify include/linux/fsnotify.h:264 [inline] vfs_rmdir+0x247/0x3e0 fs/namei.c:3865 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+0x446/0x500 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7efc0af04c97 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe7892b5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efc0af04c97 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe7892b690 RBP: 00007ffe7892b690 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe7892c720 R13: 00007efc0af8589d R14: 00000000000383af R15: 00007ffe7892c760 Modules linked in: CR2: 0000000000000170 ---[ end trace bb600494001134c4 ]--- 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 01 33 b8 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 90 1b f2 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 81 RSP: 0018:ffffc900012e7d28 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000286 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170 RBP: ffffc900012e7d38 R08: 0000000000000000 R09: ffffed102205e9c6 R10: ffffed102205e9c6 R11: 1ffff1102205e9c5 R12: 1ffff11022026e4a R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000555560e01500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 0000000122634000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 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 01 33 b8 ff call 0xffb83314 13: 48 8d bb 70 01 00 00 lea 0x170(%rbx),%rdi 1a: be 04 00 00 00 mov $0x4,%esi 1f: e8 90 1b f2 ff call 0xfff21bb4 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: 81 .byte 0x81