syzbot


kernel BUG in ext4_get_group_info

Status: upstream: reported C repro on 2023/03/14 16:12
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+68738a2da488f01910e0@syzkaller.appspotmail.com
First crash: 464d, last: 393d
Fix commit to backport (bisect log) :
tree: upstream
commit 2220eaf90992c11d888fe771055d4de330385f01
Author: Theodore Ts'o <tytso@mit.edu>
Date: Fri May 12 19:11:02 2023 +0000

  ext4: add bounds checking in get_max_inline_xattr_value_size()

[report pending]
  
Fix bisection: fixed by (bisect log) [no-op commit]:
commit f0a06203f2fe63f04311467200c99c4ee1926578
Author: harperchen <harperchen1110@gmail.com>
Date: Thu Mar 2 12:39:05 2023 +0000

  media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()

  
Bug presence (3)
Date Name Commit Repro Result
2023/06/27 linux-5.15.y (ToT) f67653019430 C [report] kernel BUG in ext4_writepages
2023/05/13 upstream (ToT) 9a48d6046722 C [report] kernel BUG in ext4_get_group_info
2023/06/27 upstream (ToT) 1ef6663a587b C Didn't crash
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ext4_get_group_info ext4 C error 237 403d 1036d 22/27 fixed on 2023/07/01 16:05
linux-6.1 kernel BUG in ext4_get_group_info origin:lts-only C done 18 293d 458d 0/3 upstream: reported C repro on 2023/03/19 23:40
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2023/11/19 09:18 7h30m fix candidate upstream job log (1)
2023/10/12 08:25 6h45m fix candidate upstream error job log (0)
2023/06/25 05:05 8h43m bisect fix linux-5.15.y job log (1)

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/ext4/ext4.h:3355!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3505 Comm: syz-executor153 Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:ext4_get_group_info+0x399/0x3a0 fs/ext4/ext4.h:3355
Code: 62 ff 8b 74 24 04 48 c7 c7 a0 60 a8 8c 4c 89 f2 e8 ec 0b 0a 02 43 80 3c 2c 00 0f 85 23 fd ff ff e9 26 fd ff ff e8 a7 36 62 ff <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00
RSP: 0018:ffffc90002caf340 EFLAGS: 00010293
RAX: ffffffff821da7d9 RBX: 00000000fffffac6 RCX: ffff888078779d00
RDX: 0000000000000000 RSI: 00000000fffffac6 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff821da4a9 R09: ffffed100e95586f
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100f350ccf
R13: dffffc0000000000 R14: ffff888079572000 R15: ffff888079a86678
FS:  00007f5262f10700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca2e72fc0 CR3: 0000000079df0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_load_buddy_gfp+0xc7/0x1500 fs/ext4/mballoc.c:1498
 ext4_discard_preallocations+0x84d/0xfc0 fs/ext4/mballoc.c:5033
 ext4_truncate+0x97e/0x1130 fs/ext4/inode.c:4242
 ext4_truncate_failed_write fs/ext4/truncate.h:22 [inline]
 ext4_write_begin+0xb58/0x15f0 fs/ext4/inode.c:1251
 ext4_da_write_begin+0x342/0xb60 fs/ext4/inode.c:2973
 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
 ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
 ext4_file_write_iter+0x87c/0x1990
 call_write_iter include/linux/fs.h:2103 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0xacf/0xe50 fs/read_write.c:594
 ksys_write+0x1a2/0x2c0 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5262f64789
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 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:00007f5262f102f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5262fe97a0 RCX: 00007f5262f64789
RDX: 000000000208e24b RSI: 0000000020000000 RDI: 0000000000000006
RBP: 00007f5262fb694c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 6f6f6c2f7665642f R14: 632e79726f6d656d R15: 00007f5262fe97a8
 </TASK>
Modules linked in:
---[ end trace 65ced1f25e574347 ]---
RIP: 0010:ext4_get_group_info+0x399/0x3a0 fs/ext4/ext4.h:3355
Code: 62 ff 8b 74 24 04 48 c7 c7 a0 60 a8 8c 4c 89 f2 e8 ec 0b 0a 02 43 80 3c 2c 00 0f 85 23 fd ff ff e9 26 fd ff ff e8 a7 36 62 ff <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00
RSP: 0018:ffffc90002caf340 EFLAGS: 00010293
RAX: ffffffff821da7d9 RBX: 00000000fffffac6 RCX: ffff888078779d00
RDX: 0000000000000000 RSI: 00000000fffffac6 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff821da4a9 R09: ffffed100e95586f
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100f350ccf
R13: dffffc0000000000 R14: ffff888079572000 R15: ffff888079a86678
FS:  00007f5262f10700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd13239be8 CR3: 0000000079df0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (17):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/08 02:07 linux-5.15.y 8a7f2a5c5aa1 90c93c40 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/05/07 18:32 linux-5.15.y 8a7f2a5c5aa1 90c93c40 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/04/01 11:55 linux-5.15.y c957cbb87315 f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/03/15 03:52 linux-5.15.y 2ddbd0f967b3 0d5c4377 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/05/21 21:32 linux-5.15.y 9d6bde853685 4bce1a3e .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/05/22 15:57 linux-5.15.y 9d6bde853685 4bce1a3e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/05/24 08:32 linux-5.15.y 9d6bde853685 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/05/24 08:32 linux-5.15.y 9d6bde853685 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/05/04 17:33 linux-5.15.y 8a7f2a5c5aa1 518a39a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/05/03 01:17 linux-5.15.y 8a7f2a5c5aa1 48e0a81d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/04/28 02:52 linux-5.15.y f48aeeaaa64c 6f3d6fa7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/04/23 22:35 linux-5.15.y 3299fb36854f 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/04/23 03:41 linux-5.15.y 3299fb36854f 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/03/29 21:41 linux-5.15.y 115472395b0a f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/03/28 17:45 linux-5.15.y 115472395b0a fc067f05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/03/16 23:31 linux-5.15.y 2ddbd0f967b3 18b58603 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
2023/03/14 16:12 linux-5.15.y 2ddbd0f967b3 0d5c4377 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan kernel BUG in ext4_get_group_info
* Struck through repros no longer work on HEAD.