general protection fault, probably for non-canonical address 0xdffffc00040012f0: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000020009780-0x0000000020009787] CPU: 1 PID: 4029 Comm: syz-executor.2 Not tainted 6.3.0-rc3-next-20230327 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:do_iter_write+0x477/0x700 Code: 00 0f 85 fd 01 00 00 4d 8b 7c 24 28 e8 d2 05 c6 ff 48 8b 44 24 18 80 38 00 0f 85 68 01 00 00 48 8b 43 18 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3b 01 00 00 48 8b 4c 24 20 48 8b 30 80 39 00 RSP: 0018:ffff88803fd9fc70 EFLAGS: 00010216 RAX: 0000000020009780 RBX: ffff88803fd9fd60 RCX: ffffc90001e0e000 RDX: 00000000040012f0 RSI: ffffffff8185830e RDI: 0000000000000007 RBP: 0000000000000005 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000001 R12: ffff88801a3ab180 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff84a66820 FS: 00007f3addbdc700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020009780 CR3: 000000000d8cc000 CR4: 0000000000350ee0 Call Trace: vfs_writev+0x1ae/0x660 __x64_sys_pwritev+0x233/0x310 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f3ae0666b19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3addbdc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 00007f3ae0779f60 RCX: 00007f3ae0666b19 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f3ae06c0f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcd6d784bf R14: 00007f3addbdc300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:do_iter_write+0x477/0x700 Code: 00 0f 85 fd 01 00 00 4d 8b 7c 24 28 e8 d2 05 c6 ff 48 8b 44 24 18 80 38 00 0f 85 68 01 00 00 48 8b 43 18 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3b 01 00 00 48 8b 4c 24 20 48 8b 30 80 39 00 RSP: 0018:ffff88803fd9fc70 EFLAGS: 00010216 RAX: 0000000020009780 RBX: ffff88803fd9fd60 RCX: ffffc90001e0e000 RDX: 00000000040012f0 RSI: ffffffff8185830e RDI: 0000000000000007 RBP: 0000000000000005 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000001 R12: ffff88801a3ab180 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff84a66820 FS: 00007f3addbdc700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020009780 CR3: 000000000d8cc000 CR4: 0000000000350ee0 hrtimer: interrupt took 18134 ns lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=4116 'syz-executor.2' lo: entered promiscuous mode lo: entered allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode lo: left promiscuous mode lo: left allmulticast mode lo: entered promiscuous mode lo: entered allmulticast mode audit: type=1400 audit(1679916155.755:9): avc: denied { read } for pid=4374 comm="syz-executor.1" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 ---------------- Code disassembly (best guess): 0: 00 0f add %cl,(%rdi) 2: 85 fd test %edi,%ebp 4: 01 00 add %eax,(%rax) 6: 00 4d 8b add %cl,-0x75(%rbp) 9: 7c 24 jl 0x2f b: 28 e8 sub %ch,%al d: d2 05 c6 ff 48 8b rolb %cl,-0x74b7003a(%rip) # 0x8b48ffd9 13: 44 24 18 rex.R and $0x18,%al 16: 80 38 00 cmpb $0x0,(%rax) 19: 0f 85 68 01 00 00 jne 0x187 1f: 48 8b 43 18 mov 0x18(%rbx),%rax 23: 48 89 c2 mov %rax,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 42 80 3c 32 00 cmpb $0x0,(%rdx,%r14,1) <-- trapping instruction 2f: 0f 85 3b 01 00 00 jne 0x170 35: 48 8b 4c 24 20 mov 0x20(%rsp),%rcx 3a: 48 8b 30 mov (%rax),%rsi 3d: 80 39 00 cmpb $0x0,(%rcx)