general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 8657 Comm: syz-executor.4 Not tainted 5.19.0-syzkaller-02972-g200e340f2196 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:__lock_acquire+0x6a/0x1f80 kernel/locking/lockdep.c:4923 Code: ff df 8a 04 10 84 c0 0f 85 60 16 00 00 83 3d 10 ea 9b 0c 00 0f 84 10 15 00 00 83 3d 7f b9 36 0b 00 74 2c 4c 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ef e8 d8 d8 72 00 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc9000b127928 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000018 RBP: ffff88803b753b00 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff1c07946 R11: 1ffffffff1c07945 R12: 0000000000000000 R13: 0000000000000018 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f76b3178700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2fc7c88d38 CR3: 00000000737d8000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 prepare_to_wait+0x3f/0x310 kernel/sched/wait.c:265 nr_accept+0x53b/0x660 net/netrom/af_netrom.c:793 do_accept+0x4d0/0x6d0 net/socket.c:1856 __sys_accept4_file net/socket.c:1899 [inline] __sys_accept4+0x104/0x170 net/socket.c:1929 __do_sys_accept net/socket.c:1947 [inline] __se_sys_accept net/socket.c:1944 [inline] __x64_sys_accept+0x79/0x90 net/socket.c:1944 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f76b2089209 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f76b3178168 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: ffffffffffffffda RBX: 00007f76b219c1d0 RCX: 00007f76b2089209 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f76b20e3161 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc3228e65f R14: 00007f76b3178300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0x6a/0x1f80 kernel/locking/lockdep.c:4923 Code: ff df 8a 04 10 84 c0 0f 85 60 16 00 00 83 3d 10 ea 9b 0c 00 0f 84 10 15 00 00 83 3d 7f b9 36 0b 00 74 2c 4c 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ef e8 d8 d8 72 00 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc9000b127928 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000018 RBP: ffff88803b753b00 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff1c07946 R11: 1ffffffff1c07945 R12: 0000000000000000 R13: 0000000000000018 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f76b3178700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2fc7c88d38 CR3: 00000000737d8000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: df 8a 04 10 84 c0 fisttps -0x3f7beffc(%rdx) 6: 0f 85 60 16 00 00 jne 0x166c c: 83 3d 10 ea 9b 0c 00 cmpl $0x0,0xc9bea10(%rip) # 0xc9bea23 13: 0f 84 10 15 00 00 je 0x1529 19: 83 3d 7f b9 36 0b 00 cmpl $0x0,0xb36b97f(%rip) # 0xb36b99f 20: 74 2c je 0x4e 22: 4c 89 e8 mov %r13,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2d: 74 12 je 0x41 2f: 4c 89 ef mov %r13,%rdi 32: e8 d8 d8 72 00 callq 0x72d90f 37: 48 rex.W 38: ba 00 00 00 00 mov $0x0,%edx 3d: 00 fc add %bh,%ah