syzbot


general protection fault in iter_file_splice_write

Status: upstream: reported C repro on 2024/05/20 08:06
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+d2125fcb6aa8c4276fd2@syzkaller.appspotmail.com
First crash: 361d, last: 1d11h
Cause bisection: introduced by (bisect log) :
commit 2df86547b23dabcd02ab000a24ed7813606c269f
Author: David Howells <dhowells@redhat.com>
Date: Fri Mar 8 12:36:05 2024 +0000

  netfs: Cut over to using new writeback code

Crash: BUG: unable to handle kernel NULL pointer dereference in iter_file_splice_write (log)
Repro: C syz .config
  
Discussions (4)
Title Replies (including bot) Last reply
[PATCH] fix: general protection fault in iter_file_splice_write 4 (4) 2024/11/04 17:12
[syzbot] [fs?] general protection fault in iter_file_splice_write 8 (24) 2024/08/11 22:43
[syzbot] Monthly fs report (Jul 2024) 0 (1) 2024/07/18 07:59
[PATCH] netfs: if extracting pages from user iterator fails return 0 1 (1) 2024/05/24 05:35
Last patch testing requests (14)
Created Duration User Patch Repo Result
2024/05/24 03:51 24m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/24 02:07 23m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/24 01:30 20m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/24 00:52 22m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/23 14:13 23m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/23 12:33 24m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/23 09:23 11m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb error
2024/05/23 08:33 23m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/22 14:05 23m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb error
2024/05/22 13:30 23m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/22 12:49 23m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/22 11:30 24m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log
2024/05/22 10:37 18m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb report log
2024/05/22 05:22 22m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb OK log

Sample crash report:
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 UID: 0 PID: 5818 Comm: syz-executor197 Not tainted 6.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
RIP: 0010:iter_file_splice_write+0xa2d/0x10b0 fs/splice.c:759
Code: 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 b1 04 00 00 4d 8b 65 10 49 c7 45 10 00 00 00 00 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 1a 05 00 00 49 8b 54 24 08 4c 89 ee 4c 89 ff 83
RSP: 0018:ffffc9000449f938 EFLAGS: 00010202
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff821e9ad1
RDX: 0000000000000001 RSI: ffffffff821e9995 RDI: 0000000000000008
RBP: 0000000000000010 R08: 0000000000000006 R09: 0000000000000000
R10: 7ffffffffffeffff R11: 0000000000000002 R12: 0000000000000000
R13: ffff888030203800 R14: 7ffffffffffeffff R15: ffff888078c2d800
FS:  0000555581a52380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9448a7e00 CR3: 0000000031220000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x18f/0x6c0 fs/splice.c:1164
 splice_direct_to_actor+0x346/0xa40 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x178/0x250 fs/splice.c:1233
 do_sendfile+0xaed/0xe30 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x1da/0x220 fs/read_write.c:1410
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe944874ef9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe63291668 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fe944874ef9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fe9448be04e R08: 0000000000000006 R09: 0000000000000006
R10: 000000007ffff000 R11: 0000000000000246 R12: 00007ffe6329167c
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>
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+0xa2d/0x10b0 fs/splice.c:759
Code: 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 b1 04 00 00 4d 8b 65 10 49 c7 45 10 00 00 00 00 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 1a 05 00 00 49 8b 54 24 08 4c 89 ee 4c 89 ff 83
RSP: 0018:ffffc9000449f938 EFLAGS: 00010202
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff821e9ad1
RDX: 0000000000000001 RSI: ffffffff821e9995 RDI: 0000000000000008
RBP: 0000000000000010 R08: 0000000000000006 R09: 0000000000000000
R10: 7ffffffffffeffff R11: 0000000000000002 R12: 0000000000000000
R13: ffff888030203800 R14: 7ffffffffffeffff R15: ffff888078c2d800
FS:  0000555581a52380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555f1942e058 CR3: 0000000031220000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 48 89             	add    %cl,-0x77(%rax)
   3:	fa                   	cli
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1)
   c:	0f 85 b1 04 00 00    	jne    0x4c3
  12:	4d 8b 65 10          	mov    0x10(%r13),%r12
  16:	49 c7 45 10 00 00 00 	movq   $0x0,0x10(%r13)
  1d:	00
  1e:	49 8d 7c 24 08       	lea    0x8(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1) <-- trapping instruction
  2e:	0f 85 1a 05 00 00    	jne    0x54e
  34:	49 8b 54 24 08       	mov    0x8(%r12),%rdx
  39:	4c 89 ee             	mov    %r13,%rsi
  3c:	4c 89 ff             	mov    %r15,%rdi
  3f:	83                   	.byte 0x83

Crashes (2712):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/23 23:04 upstream 4bbf9020becb 444551c4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in iter_file_splice_write
2024/08/11 09:31 upstream 5189dafa4cf9 6f4edef4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in iter_file_splice_write
2025/05/01 11:10 upstream 7a13c14ee59d ce7952f4 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/03 01:08 upstream 1973160c90d7 c3901742 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/02/12 16:56 upstream 09fbf3d50205 b27c2402 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2024/11/08 15:12 upstream 906bd684e4b1 d40c056e .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2024/11/05 14:27 upstream 2e1b3cc9d7f7 da38b4c9 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2024/10/24 15:39 upstream c2ee9f594da8 c08e46d6 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2024/10/22 20:32 upstream c2ee9f594da8 a573a9f4 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2024/05/16 08:21 upstream 33e02dc69afb ef5d53ed .config console log report syz C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/01/11 21:31 linux-next 7b4b9bf203da 6dbc6a9b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in iter_file_splice_write
2025/01/11 17:31 linux-next 7b4b9bf203da 6dbc6a9b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in iter_file_splice_write
2025/01/07 20:11 linux-next 7b4b9bf203da f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in iter_file_splice_write
2025/03/10 15:45 upstream 80e54e84911a 16256247 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/03/29 07:21 upstream eff5f16bfd87 cf25e2c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in iter_file_splice_write
2025/02/24 17:21 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in iter_file_splice_write
2025/02/07 13:10 upstream bb066fe812d6 a4f327c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in iter_file_splice_write
2025/01/09 02:10 upstream 0b7958fa05d5 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in iter_file_splice_write
2025/05/04 22:34 upstream 081bc61f9312 b0714e37 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/04/30 03:26 upstream 8bac8898fe39 85a5a23f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/04/25 11:48 upstream 02ddfb981de8 dea5c7e4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/04/23 23:05 upstream a79be02bba5c 9882047a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/04/22 14:34 upstream a33b5a08cbbd 53a8b9bd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/22 05:02 upstream a33b5a08cbbd 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/21 23:59 upstream 9d7a0577c9db 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/21 18:27 upstream 9d7a0577c9db 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/21 03:24 upstream 6fea5fabd332 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/19 02:30 upstream 3088d26962e8 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/18 21:44 upstream fc96b232f8e7 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/16 10:54 upstream 1a1d569a75f3 a95239b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/14 02:33 upstream 5aaaedb0cb54 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/13 21:15 upstream 5aaaedb0cb54 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/13 18:02 upstream 5aaaedb0cb54 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/04/12 10:21 upstream e618ee89561b 0bd6db41 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/31 02:21 upstream 7f2ff7b62617 d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/30 21:35 upstream 7f2ff7b62617 d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/30 20:32 upstream 7f2ff7b62617 d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/30 18:45 upstream 7f2ff7b62617 d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/30 13:31 upstream 93d52288679e d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/30 09:39 upstream 93d52288679e d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/30 00:52 upstream 7d06015d936c d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/29 21:35 upstream 7d06015d936c d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/29 15:07 upstream 7d06015d936c d3999433 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/03/29 12:02 upstream eff5f16bfd87 cf25e2c2 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in iter_file_splice_write
2025/03/29 03:27 upstream 0c86b42439b6 cf25e2c2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in iter_file_splice_write
2025/05/10 23:03 upstream 1a33418a69cc 77908e5f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/05/04 17:01 upstream e8ab83e34bdc b0714e37 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/05/03 03:11 upstream 00b827f0cffa b0714e37 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/27 04:52 upstream 5bc1018675ec c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/26 22:24 upstream f1a3944c860b c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/26 20:23 upstream f1a3944c860b c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/26 08:52 upstream c3137514f1f1 c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/25 16:41 upstream 02ddfb981de8 dea5c7e4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/25 07:32 upstream e72e9e693307 e3715315 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/05 13:59 upstream 9f867ba24d36 c53ea9c9 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/01 04:28 upstream 609706855d90 36d76a97 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/03/31 20:00 upstream 609706855d90 36d76a97 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/03/31 16:18 upstream 4e82c87058f4 d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/03/31 12:40 upstream 4e82c87058f4 d3999433 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/03/28 23:28 upstream acb4f33713b9 9a1a9e31 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in iter_file_splice_write
2025/04/14 23:49 linux-next 01c6df60d5d4 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in iter_file_splice_write
2025/04/09 09:27 linux-next 46086739de22 b133e63a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in iter_file_splice_write
2025/04/01 00:15 linux-next 405e2241def8 36d76a97 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in iter_file_splice_write
2025/03/29 20:01 linux-next e21edb1638e8 d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in iter_file_splice_write
* Struck through repros no longer work on HEAD.