syzbot


kernel BUG in ext4_enable_quotas

Status: upstream: reported syz repro on 2024/05/11 18:29
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+b8184e50b27e383218a1@syzkaller.appspotmail.com
First crash: 157d, last: 123d
Fix bisection: failed (error log, bisect log)
  
Bug presence (1)
Date Name Commit Repro Result
2024/05/11 upstream (ToT) cf87f46fd34d C [report] kernel BUG in ext4_enable_quotas
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 kernel BUG in ext4_enable_quotas C error 2 45d 422d 0/2 upstream: reported C repro on 2023/08/20 19:02
android-5-15 kernel BUG in ext4_enable_quotas origin:upstream C error 1 45d 395d 0/2 upstream: reported C repro on 2023/09/16 16:19
upstream kernel BUG in ext4_enable_quotas ext4 C error done 16 286d 467d 25/28 fixed on 2024/02/16 19:40
android-6-1 kernel BUG in ext4_enable_quotas origin:upstream C error error 1 32d 421d 0/2 upstream: reported C repro on 2023/08/21 04:17
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/10/08 09:05 8m retest repro linux-5.15.y report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/10/15 03:29 0m bisect fix linux-5.15.y error job log
2024/06/14 02:14 2h20m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
loop3: detected capacity change from 0 to 517
------------[ cut here ]------------
kernel BUG at fs/ext4/super.c:6376!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 16292 Comm: syz-executor.3 Not tainted 5.15.158-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:ext4_quota_enable fs/ext4/super.c:6376 [inline]
RIP: 0010:ext4_enable_quotas+0xd30/0xd40 fs/ext4/super.c:6423
Code: ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 63 f5 ff ff 49 89 d6 48 89 df e8 dd 62 9f ff 4c 89 f2 e9 50 f5 ff ff e8 c0 8a 55 ff <0f> 0b e8 b9 8a 55 ff 0f 0b e8 92 fb f2 07 66 90 55 41 57 41 56 41
RSP: 0018:ffffc90003937840 EFLAGS: 00010293
RAX: ffffffff822ad200 RBX: 0000000000000000 RCX: ffff888079c85940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003937a10 R08: ffffffff822ac92b R09: ffffed100c9cea8e
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880650cd464 R15: ffff88801e92e000
FS:  00007ff4863246c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001400 CR3: 00000000619a3000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_fill_super+0x9598/0xa110 fs/ext4/super.c:4959
 mount_bdev+0x2c9/0x3f0 fs/super.c:1387
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1517
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3005
 do_mount fs/namespace.c:3348 [inline]
 __do_sys_mount fs/namespace.c:3556 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff486fa546a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ff486323ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff486323f80 RCX: 00007ff486fa546a
RDX: 00000000200005c0 RSI: 0000000020000000 RDI: 00007ff486323f40
RBP: 00000000200005c0 R08: 00007ff486323f80 R09: 0000000000200810
R10: 0000000000200810 R11: 0000000000000246 R12: 0000000020000000
R13: 00007ff486323f40 R14: 00000000000004da R15: 0000000020001400
 </TASK>
Modules linked in:
---[ end trace 809c595ef2dee42a ]---
RIP: 0010:ext4_quota_enable fs/ext4/super.c:6376 [inline]
RIP: 0010:ext4_enable_quotas+0xd30/0xd40 fs/ext4/super.c:6423
Code: ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 63 f5 ff ff 49 89 d6 48 89 df e8 dd 62 9f ff 4c 89 f2 e9 50 f5 ff ff e8 c0 8a 55 ff <0f> 0b e8 b9 8a 55 ff 0f 0b e8 92 fb f2 07 66 90 55 41 57 41 56 41
RSP: 0018:ffffc90003937840 EFLAGS: 00010293
RAX: ffffffff822ad200 RBX: 0000000000000000 RCX: ffff888079c85940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003937a10 R08: ffffffff822ac92b R09: ffffed100c9cea8e
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880650cd464 R15: ffff88801e92e000
FS:  00007ff4863246c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8711f5ef38 CR3: 00000000619a3000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/11 18:29 linux-5.15.y 284087d4f7d5 9026e142 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan kernel BUG in ext4_enable_quotas
* Struck through repros no longer work on HEAD.