syzbot


kernel BUG in f2fs_vm_page_mkwrite

Status: auto-obsoleted due to no activity on 2024/09/10 22:21
Reported-by: syzbot+08e9f16eafbb8233ddcc@syzkaller.appspotmail.com
First crash: 184d, last: 184d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in f2fs_vm_page_mkwrite f2fs C error done 12 153d 180d 27/28 fixed on 2024/08/21 09:01
linux-5.15 kernel BUG in f2fs_vm_page_mkwrite origin:upstream C done 3 143d 184d 3/3 fixed on 2024/08/26 14:10

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/f2fs/file.c:101!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5933 Comm: syz-executor.2 Not tainted 6.1.92-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:f2fs_vm_page_mkwrite+0xf42/0x1410 fs/f2fs/file.c:101
Code: fe e9 a6 f4 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 07 fb ff ff e8 cd 57 20 fe e9 fd fa ff ff e8 13 53 c9 06 e8 4e d8 c8 fd <0f> 0b e8 47 d8 c8 fd 4c 89 ff 48 c7 c6 a0 73 31 8b e8 48 89 08 fe
RSP: 0018:ffffc900067277c0 EFLAGS: 00010287
RAX: ffffffff83c1b502 RBX: 0000000000000400 RCX: 0000000000040000
RDX: ffffc90003201000 RSI: 0000000000000841 RDI: 0000000000000842
RBP: ffffc90006727908 R08: ffffffff83c1aa71 R09: ffffed100aae9a93
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90006727b70
R13: 0000000020010601 R14: 0000000020010602 R15: ffff88805574d490
FS:  00007f9938fd26c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd22000 CR3: 000000006002c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_page_mkwrite+0x1a1/0x5f0 mm/memory.c:2992
 wp_page_shared+0x164/0x380 mm/memory.c:3341
 handle_pte_fault mm/memory.c:5031 [inline]
 __handle_mm_fault mm/memory.c:5155 [inline]
 handle_mm_fault+0x2525/0x5340 mm/memory.c:5276
 do_user_addr_fault arch/x86/mm/fault.c:1371 [inline]
 handle_page_fault arch/x86/mm/fault.c:1462 [inline]
 exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1518
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:copy_user_short_string+0xd/0x40 arch/x86/lib/copy_user_64.S:233
Code: 74 0a 89 d1 f3 a4 89 c8 0f 01 ca c3 89 d0 0f 01 ca c3 01 ca eb e7 0f 1f 80 00 00 00 00 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a
RSP: 0018:ffffc90006727d70 EFLAGS: 00050202
RAX: ffffffff84385601 RBX: 00007fffffffeff0 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffc90006727de0 RDI: 0000000020000280
RBP: ffffc90006727e50 R08: 00000000665cf021 R09: fffff52000ce4fbe
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000010
R13: dffffc0000000000 R14: 0000000020000280 R15: ffffc90006727de0
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 _copy_to_user+0xe9/0x130 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:169 [inline]
 put_timespec64+0xf6/0x150 kernel/time/time.c:812
 __do_sys_clock_gettime kernel/time/posix-timers.c:1134 [inline]
 __se_sys_clock_gettime kernel/time/posix-timers.c:1122 [inline]
 __x64_sys_clock_gettime+0x1cd/0x220 kernel/time/posix-timers.c:1122
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f993827cee9
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:00007f9938fd20c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4
RAX: ffffffffffffffda RBX: 00007f99383b3fa0 RCX: 00007f993827cee9
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000000
RBP: 00007f99382c947f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f99383b3fa0 R15: 00007ffc03175408
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f2fs_vm_page_mkwrite+0xf42/0x1410 fs/f2fs/file.c:101
Code: fe e9 a6 f4 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 07 fb ff ff e8 cd 57 20 fe e9 fd fa ff ff e8 13 53 c9 06 e8 4e d8 c8 fd <0f> 0b e8 47 d8 c8 fd 4c 89 ff 48 c7 c6 a0 73 31 8b e8 48 89 08 fe
RSP: 0018:ffffc900067277c0 EFLAGS: 00010287
RAX: ffffffff83c1b502 RBX: 0000000000000400 RCX: 0000000000040000
RDX: ffffc90003201000 RSI: 0000000000000841 RDI: 0000000000000842
RBP: ffffc90006727908 R08: ffffffff83c1aa71 R09: ffffed100aae9a93
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90006727b70
R13: 0000000020010601 R14: 0000000020010602 R15: ffff88805574d490
FS:  00007f9938fd26c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01bed4019c CR3: 000000006002c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	74 0a                	je     0xc
   2:	89 d1                	mov    %edx,%ecx
   4:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi)
   6:	89 c8                	mov    %ecx,%eax
   8:	0f 01 ca             	clac
   b:	c3                   	ret
   c:	89 d0                	mov    %edx,%eax
   e:	0f 01 ca             	clac
  11:	c3                   	ret
  12:	01 ca                	add    %ecx,%edx
  14:	eb e7                	jmp    0xfffffffd
  16:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  1d:	89 d1                	mov    %edx,%ecx
  1f:	83 e2 07             	and    $0x7,%edx
  22:	c1 e9 03             	shr    $0x3,%ecx
  25:	74 12                	je     0x39
  27:	4c 8b 06             	mov    (%rsi),%r8
* 2a:	4c 89 07             	mov    %r8,(%rdi) <-- trapping instruction
  2d:	48 8d 76 08          	lea    0x8(%rsi),%rsi
  31:	48 8d 7f 08          	lea    0x8(%rdi),%rdi
  35:	ff c9                	dec    %ecx
  37:	75 ee                	jne    0x27
  39:	21 d2                	and    %edx,%edx
  3b:	74 10                	je     0x4d
  3d:	89 d1                	mov    %edx,%ecx
  3f:	8a                   	.byte 0x8a

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/02 22:20 linux-6.1.y 88690811da69 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in f2fs_vm_page_mkwrite
2024/06/02 22:20 linux-6.1.y 88690811da69 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in f2fs_vm_page_mkwrite
* Struck through repros no longer work on HEAD.