BUG: spinlock recursion on CPU#1, syz.4.23/5470 BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 800000007e00f067 P4D 800000007e00f067 PUD 1f2da067 PMD 0 Oops: Oops: 0010 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 5470 Comm: syz.4.23 Not tainted 6.11.0-rc4-next-20240823-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90004e65c60 EFLAGS: 00010093 RAX: 00000000ffffffff RBX: ffffffff81421861 RCX: ffff888023deda00 RDX: 0000000000000000 RSI: ffffffff82108a39 RDI: ffffffff814307e3 RBP: ffffffff8e4ca668 R08: ffffffff8bb0a814 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8bb0a7a0 R12: ffffffff8e4c9fa8 R13: ffffc90004e65ce0 R14: 00000000ffffffff R15: 000000000000000c FS: 000055558de10500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000007ece4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __pfx_cmp_ex_search+0x10/0x10 lookup_address_in_pgd_attr+0x2c3/0x800 lookup_address_in_pgd_attr+0x2c3/0x800 Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90004e65c60 EFLAGS: 00010093 RAX: 00000000ffffffff RBX: ffffffff81421861 RCX: ffff888023deda00 RDX: 0000000000000000 RSI: ffffffff82108a39 RDI: ffffffff814307e3 RBP: ffffffff8e4ca668 R08: ffffffff8bb0a814 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8bb0a7a0 R12: ffffffff8e4c9fa8 R13: ffffc90004e65ce0 R14: 00000000ffffffff R15: 000000000000000c FS: 000055558de10500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000007ece4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400