RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc39afa700 RBP: 00007ffc39afa700 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc39afb7c0 R13: 00007f55b825444c R14: 000000000000c81a R15: 000000000000c4e5 ---[ end trace 630d859b34aec55e ]--- BUG: kernel NULL pointer dereference, address: 0000000000000170 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 126a1c067 P4D 126a1c067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 712 Comm: syz-executor Tainted: G W 5.15.151-syzkaller-00415-gdb06c48ab67e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline] RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline] RIP: 0010:ihold+0x25/0x60 fs/inode.c:426 Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 11 b5 ae ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 b0 f0 f0 ff bb 01 00 00 00 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 94 b8 ae RSP: 0018:ffffc900009e7cc8 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81c182c0 RDX: 0000000000000001 RSI: 0000000000000286 RDI: 0000000000000170 RBP: ffffc900009e7cd8 R08: ffffffff81bdf397 R09: ffffed1021f64450 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff88812366f770 R14: 0000000000000000 R15: 1ffff110246cdef4 FS: 00005555569a6500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 0000000120421000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x201/0x470 fs/namei.c:4162 incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1961 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:175 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f55b81e7e87 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:00007ffc39afa648 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f55b81e7e87 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc39afa700 RBP: 00007ffc39afa700 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc39afb7c0 R13: 00007f55b825444c R14: 000000000000c81a R15: 000000000000c4e5 Modules linked in: CR2: 0000000000000170 ---[ end trace 630d859b34aec55f ]--- RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline] RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline] RIP: 0010:ihold+0x25/0x60 fs/inode.c:426 Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 11 b5 ae ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 b0 f0 f0 ff bb 01 00 00 00 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 94 b8 ae RSP: 0018:ffffc900009e7cc8 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81c182c0 RDX: 0000000000000001 RSI: 0000000000000286 RDI: 0000000000000170 RBP: ffffc900009e7cd8 R08: ffffffff81bdf397 R09: ffffed1021f64450 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff88812366f770 R14: 0000000000000000 R15: 1ffff110246cdef4 FS: 00005555569a6500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 0000000120421000 CR4: 00000000003506a0 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: 00 55 48 add %dl,0x48(%rbp) 7: 89 e5 mov %esp,%ebp 9: 41 56 push %r14 b: 53 push %rbx c: 49 89 fe mov %rdi,%r14 f: e8 11 b5 ae ff call 0xffaeb525 14: 49 8d be 70 01 00 00 lea 0x170(%r14),%rdi 1b: be 04 00 00 00 mov $0x4,%esi 20: e8 b0 f0 f0 ff call 0xfff0f0d5 25: bb 01 00 00 00 mov $0x1,%ebx * 2a: f0 41 0f c1 9e 70 01 lock xadd %ebx,0x170(%r14) <-- trapping instruction 31: 00 00 33: ff c3 inc %ebx 35: bf 02 00 00 00 mov $0x2,%edi 3a: 89 de mov %ebx,%esi 3c: e8 .byte 0xe8 3d: 94 xchg %eax,%esp 3e: b8 .byte 0xb8 3f: ae scas %es:(%rdi),%al