---[ end trace 6b4aa3c364c1a8bc ]--- ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline] BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:426 Write of size 4 at addr 0000000000000170 by task syz-executor/1334 CPU: 0 PID: 1334 Comm: syz-executor Tainted: G W 5.15.167-syzkaller-00348-g2e66050fb753 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 __kasan_report mm/kasan/report.c:431 [inline] kasan_report+0x16f/0x1c0 mm/kasan/report.c:444 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline] ihold+0x20/0x60 fs/inode.c:426 d_delete_notify include/linux/fsnotify.h:275 [inline] vfs_rmdir+0x201/0x470 fs/namei.c:4162 incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1989 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:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xc48/0x2ca0 kernel/exit.c:880 do_group_exit+0x141/0x310 kernel/exit.c:1002 __do_sys_exit_group kernel/exit.c:1013 [inline] __se_sys_exit_group kernel/exit.c:1011 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fcd6d2f4759 Code: Unable to access opcode bytes at RIP 0x7fcd6d2f472f. RSP: 002b:00007ffec0705e48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fcd6d36766e RCX: 00007fcd6d2f4759 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000016 R08: 00007ffec0703be6 R09: 00007ffec0707100 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffec0707100 R13: 00007fcd6d3675fc R14: 00005555556324a8 R15: 00007ffec07092b0 ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000170 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 10f2b2067 P4D 10f2b2067 PUD 1154af067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1334 Comm: syz-executor Tainted: G B W 5.15.167-syzkaller-00348-g2e66050fb753 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 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 f1 91 ae ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 d0 ec 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 74 95 ae RSP: 0018:ffffc90000b57b48 EFLAGS: 00010246 RAX: ffff888119dc2700 RBX: 0000000000000001 RCX: ffff888119dc2780 RDX: 0000000000000000 RSI: 0000000000000282 RDI: 00000000ffffffff RBP: ffffc90000b57b58 R08: ffffffff8141991b R09: 0000000000000003 R10: fffffbfff0e9a64c R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff888112edf000 R14: 0000000000000000 R15: 1ffff110225dbe06 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 00000001266cb000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_delete_notify include/linux/fsnotify.h:275 [inline] vfs_rmdir+0x201/0x470 fs/namei.c:4162 incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1989 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:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xc48/0x2ca0 kernel/exit.c:880 do_group_exit+0x141/0x310 kernel/exit.c:1002 __do_sys_exit_group kernel/exit.c:1013 [inline] __se_sys_exit_group kernel/exit.c:1011 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fcd6d2f4759 Code: Unable to access opcode bytes at RIP 0x7fcd6d2f472f. RSP: 002b:00007ffec0705e48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fcd6d36766e RCX: 00007fcd6d2f4759 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000016 R08: 00007ffec0703be6 R09: 00007ffec0707100 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffec0707100 R13: 00007fcd6d3675fc R14: 00005555556324a8 R15: 00007ffec07092b0 Modules linked in: CR2: 0000000000000170 ---[ end trace 6b4aa3c364c1a8bd ]--- 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 f1 91 ae ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 d0 ec 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 74 95 ae RSP: 0018:ffffc90000b57b48 EFLAGS: 00010246 RAX: ffff888119dc2700 RBX: 0000000000000001 RCX: ffff888119dc2780 RDX: 0000000000000000 RSI: 0000000000000282 RDI: 00000000ffffffff RBP: ffffc90000b57b58 R08: ffffffff8141991b R09: 0000000000000003 R10: fffffbfff0e9a64c R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff888112edf000 R14: 0000000000000000 R15: 1ffff110225dbe06 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 00000001266cb000 CR4: 00000000003526a0 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 f1 91 ae ff call 0xffae9205 14: 49 8d be 70 01 00 00 lea 0x170(%r14),%rdi 1b: be 04 00 00 00 mov $0x4,%esi 20: e8 d0 ec f0 ff call 0xfff0ecf5 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: 74 95 je 0xffffffd4 3f: ae scas %es:(%rdi),%al