Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 27012 Comm: syz.1.27624 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:219 [inline] RIP: 0010:iter_file_splice_write+0xace/0x11b0 fs/splice.c:759 Code: 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 67 d6 e6 ff 49 8b 1e 49 c7 06 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 43 d6 e6 ff 4c 8b 1b 48 8b 3c 24 RSP: 0018:ffffc9000456fa20 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff8881281c1300 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 7ffffffffffeffff RBP: ffffc9000456fc30 R08: ffff8881f6e72240 R09: 1ffff1103edce448 R10: 1ffff1103edce44b R11: 0000000000000fd8 R12: dffffc0000000000 R13: 7ffffffffffeffff R14: ffff88811c9aa010 R15: ffff88811c9aa000 FS: 00007fb7889fc6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb7889fbf98 CR3: 000000010577a000 CR4: 00000000003526b0 Call Trace: do_splice_from fs/splice.c:941 [inline] do_splice+0x10f0/0x1d10 fs/splice.c:1354 __do_splice fs/splice.c:1436 [inline] __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice+0x38b/0x480 fs/splice.c:1634 __x64_sys_splice+0xe9/0x110 fs/splice.c:1634 x64_sys_call+0x2ea8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:276 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fb787b8f6c9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb7889fc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fb787de6090 RCX: 00007fb787b8f6c9 RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fb787c11f91 R08: 0000000000007151 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb787de6128 R14: 00007fb787de6090 R15: 00007ffc99dc4958 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:219 [inline] RIP: 0010:iter_file_splice_write+0xace/0x11b0 fs/splice.c:759 Code: 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 67 d6 e6 ff 49 8b 1e 49 c7 06 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 43 d6 e6 ff 4c 8b 1b 48 8b 3c 24 RSP: 0018:ffffc9000456fa20 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff8881281c1300 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 7ffffffffffeffff RBP: ffffc9000456fc30 R08: ffff8881f6e72240 R09: 1ffff1103edce448 R10: 1ffff1103edce44b R11: 0000000000000fd8 R12: dffffc0000000000 R13: 7ffffffffffeffff R14: ffff88811c9aa010 R15: ffff88811c9aa000 FS: 00007fb7889fc6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe96567000 CR3: 000000010577a000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: 89 f0 mov %esi,%eax 2: 48 c1 e8 03 shr $0x3,%rax 6: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) b: 74 08 je 0x15 d: 4c 89 f7 mov %r14,%rdi 10: e8 67 d6 e6 ff call 0xffe6d67c 15: 49 8b 1e mov (%r14),%rbx 18: 49 c7 06 00 00 00 00 movq $0x0,(%r14) 1f: 48 83 c3 08 add $0x8,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 43 d6 e6 ff call 0xffe6d67c 39: 4c 8b 1b mov (%rbx),%r11 3c: 48 8b 3c 24 mov (%rsp),%rdi