syzbot


kernel BUG in ext4_mb_release_inode_pa

Status: auto-obsoleted due to no activity on 2024/02/29 10:29
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+64f520f6fe02b8947407@syzkaller.appspotmail.com
First crash: 187d, last: 187d
Cause bisection: introduced by (bisect log) [ignored commit]:
commit bdfff1433cd6e2f47155f7bf205bcee32001a075
Author: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Tue Apr 18 14:35:54 2023 +0000

  can: at91_can: MSR Register: convert to FIELD_PREP()

Crash: kernel BUG in ext4_mb_release_inode_pa (log)
Repro: syz .config
  
Fix bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ext4?] kernel BUG in ext4_mb_release_inode_pa 0 (1) 2023/11/25 10:34
Last patch testing requests (1)
Created Duration User Patch Repo Result
2023/12/05 10:33 21m retest repro upstream OK log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:5300!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10719 Comm: syz-executor.1 Not tainted 6.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:ext4_mb_release_inode_pa.isra.0+0xa30/0xb80 fs/ext4/mballoc.c:5300
Code: b5 fb ff ff e8 a1 1a 50 ff 90 0f 0b e8 99 1a 50 ff 31 ff 44 89 ee e8 ff 15 50 ff 45 85 ed 0f 84 81 f8 ff ff e8 81 1a 50 ff 90 <0f> 0b e8 69 e7 a5 ff e9 e5 f6 ff ff 48 89 d7 e8 5c e7 a5 ff e9 4a
RSP: 0018:ffffc9000a1af690 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000ffffe428 RCX: ffffffff823665c1
RDX: ffff88802b52a1c0 RSI: ffffffff823665cf RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000005 R12: ffff88806442ac08
R13: 0000000000000002 R14: 1ffff92001435ee1 R15: ffff88806440c868
FS:  00007fbecfbfe6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020027040 CR3: 000000007c40e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_discard_preallocations+0x796/0xfb0 fs/ext4/mballoc.c:5581
 ext4_truncate+0xd27/0x1310 fs/ext4/inode.c:4166
 ext4_truncate_failed_write fs/ext4/truncate.h:22 [inline]
 ext4_write_end+0xa8a/0xed0 fs/ext4/inode.c:1323
 ext4_da_write_end+0x926/0x1170 fs/ext4/inode.c:3019
 generic_perform_write+0x32f/0x600 mm/filemap.c:3929
 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299
 ext4_file_write_iter+0x819/0x1950 fs/ext4/file.c:696
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x64f/0xdf0 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fbed087cae9
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:00007fbecfbfe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbed099bf80 RCX: 00007fbed087cae9
RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007fbed08c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fbed099bf80 R15: 00007ffd459e66e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_release_inode_pa.isra.0+0xa30/0xb80 fs/ext4/mballoc.c:5300
Code: b5 fb ff ff e8 a1 1a 50 ff 90 0f 0b e8 99 1a 50 ff 31 ff 44 89 ee e8 ff 15 50 ff 45 85 ed 0f 84 81 f8 ff ff e8 81 1a 50 ff 90 <0f> 0b e8 69 e7 a5 ff e9 e5 f6 ff ff 48 89 d7 e8 5c e7 a5 ff e9 4a
RSP: 0018:ffffc9000a1af690 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000ffffe428 RCX: ffffffff823665c1
RDX: ffff88802b52a1c0 RSI: ffffffff823665cf RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000005 R12: ffff88806442ac08
R13: 0000000000000002 R14: 1ffff92001435ee1 R15: ffff88806440c868
FS:  00007fbecfbfe6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020027040 CR3: 000000007c40e000 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
2023/11/21 10:28 upstream 98b1cc82c4af cb976f63 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-selinux-root kernel BUG in ext4_mb_release_inode_pa
* Struck through repros no longer work on HEAD.