R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffca1679590 R13: 00007fee7d280050 R14: 000000000000d7bb R15: 00007ffca16795d0 ---[ end trace ce146d2169c5dc12 ]--- BUG: kernel NULL pointer dereference, address: 0000000000000170 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1150dd067 P4D 1150dd067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 617 Comm: syz-executor Tainted: G 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 f1 66 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 71 RSP: 0018:ffffc90000b17d10 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000286 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170 RBP: ffffc90000b17d20 R08: 0000000000000000 R09: 1ffff11022068f1b R10: dffffc0000000000 R11: ffffed1022068f1c R12: 1ffff1102206ae06 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00005555841bf500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 00000001118b1000 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: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 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+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fee7d1eb9d7 Code: a2 c7 05 1c fd 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 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 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffca1678448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fee7d1eb9d7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffca1678500 RBP: 00007ffca1678500 R08: 00007ffca1679500 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffca1679590 R13: 00007fee7d280050 R14: 000000000000d7bb R15: 00007ffca16795d0 Modules linked in: CR2: 0000000000000170 ---[ end trace ce146d2169c5dc14 ]--- 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 f1 66 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 71 RSP: 0018:ffffc90000b17d10 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000286 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170 RBP: ffffc90000b17d20 R08: 0000000000000000 R09: 1ffff11022068f1b R10: dffffc0000000000 R11: ffffed1022068f1c R12: 1ffff1102206ae06 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00005555841bf500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 00000001118b1000 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 f1 66 b7 ff call 0xffb76704 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: 71 .byte 0x71