Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 13044 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:219 [inline] RIP: 0010:iter_file_splice_write+0xdd0/0x14e0 fs/splice.c:759 Code: 00 00 00 fc ff df 41 80 3c 06 00 49 89 c6 74 08 4c 89 ff e8 92 4e e0 ff 49 c7 07 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 81 4d e0 ff 48 8b 44 24 10 48 8b RSP: 0018:ffffc90002e3f780 EFLAGS: 00010212 RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000000005 RDX: ffffc9000fe57000 RSI: 0000000000000000 RDI: 7ffffffffffffffc RBP: ffffc90002e3fa10 R08: ffffffff821b84b0 R09: 1ffffd40003722ce R10: dffffc0000000000 R11: fffff940003722cf R12: 7ffffffffffffffc R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88805d1d2838 FS: 00007fc80fda16c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4132ee56c6 CR3: 000000007b59e000 CR4: 0000000000350ef0 Call Trace: do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x120/0x220 fs/splice.c:1164 splice_direct_to_actor+0x590/0xc90 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x28c/0x3e0 fs/splice.c:1233 do_sendfile+0x56d/0xe10 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1348 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc80f07cf29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc80fda10c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fc80f1b3f80 RCX: 00007fc80f07cf29 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007 RBP: 00007fc80f0ec074 R08: 0000000000000000 R09: 0000000000000000 R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fc80f1b3f80 R15: 00007ffe96718018 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+0xdd0/0x14e0 fs/splice.c:759 Code: 00 00 00 fc ff df 41 80 3c 06 00 49 89 c6 74 08 4c 89 ff e8 92 4e e0 ff 49 c7 07 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 81 4d e0 ff 48 8b 44 24 10 48 8b RSP: 0018:ffffc90002e3f780 EFLAGS: 00010212 RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000000005 RDX: ffffc9000fe57000 RSI: 0000000000000000 RDI: 7ffffffffffffffc RBP: ffffc90002e3fa10 R08: ffffffff821b84b0 R09: 1ffffd40003722ce R10: dffffc0000000000 R11: fffff940003722cf R12: 7ffffffffffffffc R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88805d1d2838 FS: 00007fc80fda16c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000d92618 CR3: 000000007b59e000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 6 bytes skipped: 0: 41 80 3c 06 00 cmpb $0x0,(%r14,%rax,1) 5: 49 89 c6 mov %rax,%r14 8: 74 08 je 0x12 a: 4c 89 ff mov %r15,%rdi d: e8 92 4e e0 ff call 0xffe04ea4 12: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 19: 48 83 c3 08 add $0x8,%rbx 1d: 48 89 d8 mov %rbx,%rax 20: 48 c1 e8 03 shr $0x3,%rax * 24: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 29: 74 08 je 0x33 2b: 48 89 df mov %rbx,%rdi 2e: e8 81 4d e0 ff call 0xffe04db4 33: 48 8b 44 24 10 mov 0x10(%rsp),%rax 38: 48 rex.W 39: 8b .byte 0x8b