syzbot


kernel BUG in ext4_mb_use_inode_pa (2)

Status: upstream: reported C repro on 2024/08/08 04:33
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+d79019213609e7056a19@syzkaller.appspotmail.com
First crash: 499d, last: 3d09h
Cause bisection: failed (error log, bisect log)
  
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly ext4 report (Oct 2025) 0 (1) 2025/10/29 09:02
[syzbot] [ext4?] kernel BUG in ext4_mb_use_inode_pa (2) 0 (2) 2024/09/06 04:42
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ext4_mb_use_inode_pa ext4 -1 C error done 2 1169d 1168d 22/29 fixed on 2023/02/24 13:50
Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/03/11 17:03 31m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/02/04 01:53 15m retest repro upstream report log

Sample crash report:
EXT4-fs error (device loop0): ext4_mb_mark_diskspace_used:4113: comm syz-executor314: Allocating blocks 1-17 which overlap fs metadata
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4685!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5318 Comm: syz-executor314 Not tainted 6.15.0-syzkaller-12141-gec7714e49479 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4685
Code: e8 d4 57 ab ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 30 e6 47 ff 90 0f 0b e8 28 e6 47 ff 90 0f 0b e8 20 e6 47 ff 90 <0f> 0b e8 18 e6 47 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d3cf3c8 EFLAGS: 00010293
RAX: ffffffff827875b0 RBX: 00000000ffffffff RCX: ffff888035674880
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 1ffff11008d2a23d R08: ffff8880468298a3 R09: 1ffff11008d05314
R10: dffffc0000000000 R11: ffffed1008d05315 R12: 0000000000000004
R13: 0000000000000002 R14: 1ffff11008d05317 R15: ffff8880468298b8
FS:  00007efeefd106c0(0000) GS:ffff88808d255000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efeefd10d58 CR3: 0000000044136000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4902
 ext4_mb_new_blocks+0x5b4/0x46a0 fs/ext4/mballoc.c:6206
 ext4_ext_map_blocks+0x161a/0x6ac0 fs/ext4/extents.c:4383
 ext4_map_create_blocks fs/ext4/inode.c:609 [inline]
 ext4_map_blocks+0x931/0x18d0 fs/ext4/inode.c:813
 ext4_alloc_file_blocks+0x3b8/0xc60 fs/ext4/extents.c:4538
 ext4_zero_range+0x39b/0xb90 fs/ext4/extents.c:4618
 ext4_fallocate+0x74c/0xcd0 fs/ext4/extents.c:4790
 vfs_fallocate+0x6a0/0x830 fs/open.c:341
 ksys_fallocate fs/open.c:365 [inline]
 __do_sys_fallocate fs/open.c:370 [inline]
 __se_sys_fallocate fs/open.c:368 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:368
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efeefd7c649
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 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:00007efeefd10218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007efeefe03618 RCX: 00007efeefd7c649
RDX: 0000000000000fff RSI: 0000000000000011 RDI: 0000000000000004
RBP: 00007efeefe03610 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008800000 R11: 0000000000000246 R12: 00007efeefdd0614
R13: 6273752f7665642f R14: 0000200000000080 R15: 00002000000002c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4685
Code: e8 d4 57 ab ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 30 e6 47 ff 90 0f 0b e8 28 e6 47 ff 90 0f 0b e8 20 e6 47 ff 90 <0f> 0b e8 18 e6 47 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d3cf3c8 EFLAGS: 00010293
RAX: ffffffff827875b0 RBX: 00000000ffffffff RCX: ffff888035674880
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 1ffff11008d2a23d R08: ffff8880468298a3 R09: 1ffff11008d05314
R10: dffffc0000000000 R11: ffffed1008d05315 R12: 0000000000000004
R13: 0000000000000002 R14: 1ffff11008d05317 R15: ffff8880468298b8
FS:  00007efeefd106c0(0000) GS:ffff88808d255000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efeefd10d58 CR3: 0000000044136000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (201):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/05 21:26 upstream ec7714e49479 6b6b5f21 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2024/09/06 04:41 upstream ad618736883b 464ac2ed .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/03 01:55 linux-next 7396732143a2 49379ee0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root kernel BUG in ext4_mb_use_inode_pa
2025/02/23 10:17 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a1c24ab82279 d34966d1 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-gce-arm64 kernel BUG in ext4_mb_use_inode_pa
2024/08/04 04:29 upstream defaf1a2113a 1786a2a8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root kernel BUG in ext4_mb_use_inode_pa
2025/12/12 22:11 upstream 187d0801404f d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/12 16:51 upstream 187d0801404f d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/12 06:15 upstream d358e5254674 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/12 02:21 upstream d358e5254674 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/11 18:33 upstream d358e5254674 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/10 21:03 upstream 0048fbb4011e d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/09 10:36 upstream a110f942672c d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/08 20:02 upstream c2f2b01b74be d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/07 09:53 upstream c06c303832ec d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/06 04:44 upstream d1d36025a617 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/04 14:31 upstream cc25df3e2e22 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/04 00:23 upstream 3f9f0252130e d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/03 10:21 upstream 44fc84337b6e d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/03 06:23 upstream 44fc84337b6e d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/12/02 18:33 upstream 4a26e7032d7d d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/29 06:24 upstream 19eef1d98eed d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/28 06:16 upstream aa7243aaf194 e8331348 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/27 23:49 upstream 765e56e41a5a e8331348 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/25 03:43 upstream ac3fd01e4c1e bf6fe8fe .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/21 16:18 upstream fd95357fd8c6 c31c1b0b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/19 18:53 upstream 8b690556d8fe 82d7b894 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/15 11:36 upstream 7a0892d2836e f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/14 23:16 upstream 6da43bbeb691 6d98c1c8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/10 22:09 upstream 4ea7c1717f3f 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/09 05:11 upstream 7bb4d6512545 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/06 13:43 upstream dc77806cf3b4 a6c9c731 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/05 16:36 upstream 284922f4c563 a6c9c731 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/02 14:21 upstream 691d401c7e0e 2c50b6a9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/11/02 10:09 upstream 691d401c7e0e 2c50b6a9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/31 21:29 upstream 58fdd8484c05 2c50b6a9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/30 00:29 upstream e53642b87a4f fd2207e7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/29 20:41 upstream e53642b87a4f fd2207e7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/29 10:30 upstream 8eefed8f65cc fd2207e7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/29 04:01 upstream 8eefed8f65cc fd2207e7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/28 12:13 upstream fd57572253bc fd2207e7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/22 09:33 upstream 552c50713f27 252fbbad .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/21 13:50 upstream 6548d364a3e8 9832ed61 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/20 17:24 upstream 211ddde0823f d422939c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/18 19:53 upstream f406055cb18c 1c8c8cd8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/16 12:14 upstream 7ea30958b305 19568248 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/16 09:21 upstream 7ea30958b305 19568248 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2025/10/13 14:52 upstream 3a8660878839 b6605ba8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
* Struck through repros no longer work on HEAD.