syzbot


general protection fault in ext4_block_zero_page_range

Status: auto-obsoleted due to no activity on 2023/06/15 21:14
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+254df7cbe3fbb62a0ce6@syzkaller.appspotmail.com
First crash: 346d, last: 346d

Sample crash report:
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f71f59e6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f71f4dac120 RCX: 00007f71f4c8c169
RDX: 0000000020000240 RSI: 0000000040806685 RDI: 0000000000000008
RBP: 00007f71f59e61d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd1881688f R14: 00007f71f59e6300 R15: 0000000000022000
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 15043 Comm: syz-executor.1 Not tainted 6.3.0-rc6-next-20230414-syzkaller-12018-gd3f2cd248191 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
RIP: 0010:folio_get_private include/linux/mm_types.h:419 [inline]
RIP: 0010:__ext4_block_zero_page_range fs/ext4/inode.c:3685 [inline]
RIP: 0010:ext4_block_zero_page_range+0x229/0x9a0 fs/ext4/inode.c:3784
Code: 58 ff 83 fb 3f 0f 87 a3 d1 d4 07 e8 c1 2c 58 ff 89 d9 48 b8 00 00 00 00 00 fc ff df 49 8d 5e 28 49 d3 e5 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 df 06 00 00 49 8b 6e 28 48 85 ed 0f 84 e5 05 00
RSP: 0018:ffffc90015497858 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000001c RCX: 0000000000000000
RDX: 0000000000000003 RSI: ffffffff822b49cf RDI: 0000000000000005
RBP: ffff888081d972d8 R08: 0000000000000005 R09: 000000000000003f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000008 R14: fffffffffffffff4 R15: ffff888081d970b0
FS:  00007f71f59e6700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33628000 CR3: 00000000568f2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_block_truncate_page fs/ext4/inode.c:3808 [inline]
 ext4_truncate+0xf28/0x1340 fs/ext4/inode.c:4185
 ext4_begin_enable_verity+0x1f5/0x3d0 fs/ext4/verity.c:143
 enable_verity+0x636/0x9d0 fs/verity/enable.c:245
 fsverity_ioctl_enable+0x404/0x560 fs/verity/enable.c:385
 __ext4_ioctl+0x23d2/0x4b00 fs/ext4/ioctl.c:1574
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f71f4c8c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f71f59e6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f71f4dac120 RCX: 00007f71f4c8c169
RDX: 0000000020000240 RSI: 0000000040806685 RDI: 0000000000000008
RBP: 00007f71f59e61d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd1881688f R14: 00007f71f59e6300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_get_private include/linux/mm_types.h:419 [inline]
RIP: 0010:__ext4_block_zero_page_range fs/ext4/inode.c:3685 [inline]
RIP: 0010:ext4_block_zero_page_range+0x229/0x9a0 fs/ext4/inode.c:3784
Code: 58 ff 83 fb 3f 0f 87 a3 d1 d4 07 e8 c1 2c 58 ff 89 d9 48 b8 00 00 00 00 00 fc ff df 49 8d 5e 28 49 d3 e5 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 df 06 00 00 49 8b 6e 28 48 85 ed 0f 84 e5 05 00
RSP: 0018:ffffc90015497858 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000001c RCX: 0000000000000000
RDX: 0000000000000003 RSI: ffffffff822b49cf RDI: 0000000000000005
RBP: ffff888081d972d8 R08: 0000000000000005 R09: 000000000000003f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000008 R14: fffffffffffffff4 R15: ffff888081d970b0
FS:  00007f71f59e6700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33628000 CR3: 00000000568f2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	28 00                	sub    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	75 05                	jne    0xb
   6:	48 83 c4 28          	add    $0x28,%rsp
   a:	c3                   	retq
   b:	e8 f1 19 00 00       	callq  0x1a01
  10:	90                   	nop
  11:	48 89 f8             	mov    %rdi,%rax
  14:	48 89 f7             	mov    %rsi,%rdi
  17:	48 89 d6             	mov    %rdx,%rsi
  1a:	48 89 ca             	mov    %rcx,%rdx
  1d:	4d 89 c2             	mov    %r8,%r10
  20:	4d 89 c8             	mov    %r9,%r8
  23:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  28:	0f 05                	syscall
* 2a:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax <-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	retq
  33:	48 c7 c1 b8 ff ff ff 	mov    $0xffffffffffffffb8,%rcx
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/04/16 21:14 linux-next d3f2cd248191 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in ext4_block_zero_page_range
* Struck through repros no longer work on HEAD.