RBP: 00007ff8733f6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000007f03 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ff875426038 R14: 00007ff875425fa0 R15: 00007ffdb8ba5648 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af] CPU: 2 UID: 0 PID: 6560 Comm: syz.1.180 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173 Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00 RSP: 0018:ffffc900055d7740 EFLAGS: 00010203 RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015 RDX: dffffc0000000000 RSI: ffffffff82d0acf9 RDI: 00000000000000ad RBP: ffff88803e0ee2a0 R08: 00000000ffffffff R09: fffffbfff1dffe42 R10: ffffffff8efff213 R11: 0000000000000001 R12: ffff88803e0ee1c0 R13: ffff88803e0ee378 R14: 00000000000000a0 R15: ffff88803e0ee2f2 FS: 00007ff8733f66c0(0000) GS:ffff8880d5d64000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff8733f5ff8 CR3: 0000000035d48000 CR4: 0000000000352ef0 Call Trace: netfs_unbuffered_write+0x75c/0x2020 fs/netfs/direct_write.c:111 netfs_unbuffered_write_iter_locked+0x7d6/0xa80 fs/netfs/direct_write.c:290 netfs_unbuffered_write_iter+0x442/0x720 fs/netfs/direct_write.c:382 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409 iter_file_splice_write+0x830/0x10b0 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x192/0x690 fs/splice.c:1159 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1228 do_sendfile+0xadc/0xe20 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1426 [inline] __se_sys_sendfile64 fs/read_write.c:1418 [inline] __x64_sys_sendfile64+0x154/0x220 fs/read_write.c:1418 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff87519e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff8733f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ff875425fa0 RCX: 00007ff87519e159 RDX: 0000200000000080 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 00007ff8733f6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000007f03 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ff875426038 R14: 00007ff875425fa0 R15: 00007ffdb8ba5648 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173 Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00 RSP: 0018:ffffc900055d7740 EFLAGS: 00010203 RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015 RDX: dffffc0000000000 RSI: ffffffff82d0acf9 RDI: 00000000000000ad RBP: ffff88803e0ee2a0 R08: 00000000ffffffff R09: fffffbfff1dffe42 R10: ffffffff8efff213 R11: 0000000000000001 R12: ffff88803e0ee1c0 R13: ffff88803e0ee378 R14: 00000000000000a0 R15: ffff88803e0ee2f2 FS: 00007ff8733f66c0(0000) GS:ffff8880d5d64000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff8751eb840 CR3: 0000000035d48000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: e1 07 loope 0x9 2: 38 ca cmp %cl,%dl 4: 7f 08 jg 0xe 6: 84 d2 test %dl,%dl 8: 0f 85 04 06 00 00 jne 0x612 e: 48 8d bb ad 00 00 00 lea 0xad(%rbx),%rdi 15: 0f b6 45 52 movzbl 0x52(%rbp),%eax 19: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 20: fc ff df 23: 48 89 f9 mov %rdi,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx <-- trapping instruction 2e: 48 89 f9 mov %rdi,%rcx 31: 83 e1 07 and $0x7,%ecx 34: 38 ca cmp %cl,%dl 36: 7f 08 jg 0x40 38: 84 d2 test %dl,%dl 3a: 0f 85 c1 05 00 00 jne 0x601