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: 789d, last: 30m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (10)
ID Workflow Result Correct Bug Created Started Finished Revision
08bdd589 assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/09/04 06:59 2026/09/04 06:59 2026/09/04 07:20 801f0966
0ba0c7f6 assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/08/05 00:05 2026/08/05 00:05 2026/08/05 00:05 d4abbeac
7ebfda0e assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/07/05 06:53 2026/07/05 06:53 2026/07/05 07:19 93f57954
5211717f patching 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/06/24 14:11 2026/06/24 14:11 2026/06/24 14:49 2e5297c5
8986205b assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/06/18 06:30 2026/06/18 06:30 2026/06/18 06:53 b62b3ded
791ec586 assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/06/10 02:29 2026/06/10 02:29 2026/06/10 02:53 c36c07f6
ba09ea19 assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/06/04 04:59 2026/06/04 04:59 2026/06/04 05:16 62fe1528
10408e47 assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/06/02 00:08 2026/06/02 00:08 2026/06/02 00:33 386cc6da
c6faadbc patching 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/05/21 20:54 2026/05/21 21:37 2026/05/21 22:18 d5742584
d64dc950 assessment-security 💥 kernel BUG in ext4_mb_use_inode_pa (2) 2026/05/20 01:03 2026/05/20 01:03 2026/05/20 01:27 1d9407ad
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly ext4 report (Sep 2026) 0 (1) 2026/09/11 04:33
[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 (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 kernel BUG in ext4_mb_use_inode_pa -1 syz done 2 176d 207d 0/2 auto-obsoleted due to no activity on 2026/07/08 01:45
upstream kernel BUG in ext4_mb_use_inode_pa ext4 -1 syz, C error done 2 1460d 1459d 22/29 fixed on 2023/02/24 13:50
android-5-15 kernel BUG in ext4_mb_use_inode_pa origin:lts -1 syz, C error 6 166d 222d 0/2 auto-obsoleted due to no activity on 2026/09/08 00:06
linux-6.1 kernel BUG in ext4_mb_use_inode_pa -1 syz error 1 205d 205d 0/3 auto-obsoleted due to no activity on 2026/08/29 04:02
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/05/24 13:23 28m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci no crash log
2026/05/05 16:18 23m retest repro upstream error
2026/03/11 20:07 22m retest repro upstream no crash log
2026/03/11 19:37 22m retest repro linux-next no crash log
2026/03/11 18:29 25m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci error
2026/02/24 15:16 22m retest repro upstream no crash log
2026/02/24 15:16 22m retest repro upstream no crash log
2026/02/24 15:16 14m retest repro upstream report log
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 (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
loop0: detected capacity change from 512 to 64
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4689!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5093 Comm: syz-executor323 Not tainted 6.11.0-rc6-syzkaller-00075-gad618736883b #0
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+0x690/0x700 fs/ext4/mballoc.c:4689
Code: 40 1d b0 8e 4c 89 e6 48 89 ea e8 fb c5 8b 02 e9 be fc ff ff e8 f1 05 33 ff 90 0f 0b e8 e9 05 33 ff 90 0f 0b e8 e1 05 33 ff 90 <0f> 0b e8 d9 05 33 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90002cde8e8 EFLAGS: 00010293
RAX: ffffffff826086cf RBX: 00000000fffffffe RCX: ffff88801edf2440
RDX: 0000000000000000 RSI: 0000000000000041 RDI: 000000000000003f
RBP: 0000000000000000 R08: ffffffff826083cf R09: 1ffff11003fcbd4e
R10: dffffc0000000000 R11: ffffed1003fcbd4f R12: ffff88801fe5ea88
R13: 1ffff110025a4181 R14: 0000000000000041 R15: 1ffff11003fcbd51
FS:  000055557d5ee380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 0000000000b5c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x680/0x1420 fs/ext4/mballoc.c:4906
 ext4_mb_new_blocks+0x6ef/0x4e30 fs/ext4/mballoc.c:6210
 ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0x1084/0x2a10 fs/ext4/indirect.c:635
 ext4_map_blocks+0x9f6/0x1d20 fs/ext4/inode.c:654
 mpage_map_one_extent fs/ext4/inode.c:2237 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2290 [inline]
 ext4_do_writepages+0x1605/0x3d40 fs/ext4/inode.c:2753
 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2842
 do_writepages+0x35d/0x870 mm/page-writeback.c:2683
 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 file_write_and_wait_range+0x1aa/0x290 mm/filemap.c:788
 generic_buffers_fsync_noflush+0x73/0x170 fs/buffer.c:600
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x413/0xb90 fs/ext4/fsync.c:151
 generic_write_sync include/linux/fs.h:2822 [inline]
 ext4_buffered_write_iter+0x286/0x350 fs/ext4/file.c:305
 ext4_file_write_iter+0x1de/0x1a10
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_pwrite64 fs/read_write.c:705 [inline]
 __do_sys_pwrite64 fs/read_write.c:715 [inline]
 __se_sys_pwrite64 fs/read_write.c:712 [inline]
 __x64_sys_pwrite64+0x1aa/0x230 fs/read_write.c:712
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2de5ebcc59
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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:00007ffdfe577c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2de5ebcc59
RDX: 000000000000fdef RSI: 0000000020000140 RDI: 0000000000000006
RBP: 00007f2de5f305f0 R08: 000055557d5ef4c0 R09: 000055557d5ef4c0
R10: 000000000000fecc R11: 0000000000000246 R12: 00007ffdfe577c80
R13: 00007ffdfe577ea8 R14: 431bde82d7b634db R15: 00007f2de5f0503b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x690/0x700 fs/ext4/mballoc.c:4689
Code: 40 1d b0 8e 4c 89 e6 48 89 ea e8 fb c5 8b 02 e9 be fc ff ff e8 f1 05 33 ff 90 0f 0b e8 e9 05 33 ff 90 0f 0b e8 e1 05 33 ff 90 <0f> 0b e8 d9 05 33 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90002cde8e8 EFLAGS: 00010293
RAX: ffffffff826086cf RBX: 00000000fffffffe RCX: ffff88801edf2440
RDX: 0000000000000000 RSI: 0000000000000041 RDI: 000000000000003f
RBP: 0000000000000000 R08: ffffffff826083cf R09: 1ffff11003fcbd4e
R10: dffffc0000000000 R11: ffffed1003fcbd4f R12: ffff88801fe5ea88
R13: 1ffff110025a4181 R14: 0000000000000041 R15: 1ffff11003fcbd51
FS:  000055557d5ee380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 0000000000b5c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (502):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/01/13 00:05 upstream 0f61b1860cc3 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs 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
2026/10/03 00:26 upstream 5e0f8396d480 57bbd979 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/10/02 23:24 upstream 5e0f8396d480 57bbd979 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/10/02 14:12 upstream ce1e0223d8ad 1065c8fa .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/10/01 16:35 upstream 551c722f4080 38f7f0d1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/29 21:19 upstream 6f8319e3e9a4 328436b3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/29 12:57 upstream 72d3fcf802c4 7bf4ea23 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/28 18:21 upstream 72d3fcf802c4 a7db5c9f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/27 23:54 upstream d266640c6c76 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/27 11:53 upstream fd179f8a05be a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/27 03:26 upstream 6812ce4e4379 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/26 11:36 upstream f14572c203d5 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/26 03:16 upstream f14572c203d5 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/25 19:20 upstream 165768bb7026 f281d9d2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/21 21:25 upstream f0100363d8c3 a8efa948 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/18 09:27 upstream 4982d3552a3b 8d7d05f1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/16 20:13 upstream 9b87fdc9af2f b0e4c57e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/16 05:47 upstream f6e7b42bf05b 12a0a44a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/15 12:26 upstream 587858367581 f41e228a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/14 22:28 upstream 704340f1cd0d 924033e8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/12 22:15 upstream 5225b8eec4c9 70a60e12 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/11 04:12 upstream 50d05c7c76c9 1fe56c0a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/10 13:44 upstream 50d05c7c76c9 1fe56c0a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/10 12:24 upstream 50d05c7c76c9 1fe56c0a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/10 09:41 upstream 893e11787f78 4e8b1cc6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/10 07:55 upstream 893e11787f78 4e8b1cc6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/09 17:40 upstream 893e11787f78 edec9137 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/09 16:08 upstream 893e11787f78 edec9137 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/09 08:57 upstream 5acbae5f7eb3 8387c273 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/08 09:52 upstream 28924df2a08f 680aa3e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/08 07:43 upstream 28924df2a08f 680aa3e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/07 21:30 upstream df2908090cda 5e4626f5 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/07 01:52 upstream 1fc5a74b108f 4f7b22a0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/06 19:59 upstream 1fc5a74b108f 4f7b22a0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/06 10:25 upstream 9f0346dcbea3 4f7b22a0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/05 19:27 upstream 4d7d9486c04d 4f7b22a0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/05 05:30 upstream 654ae5d73c05 4f7b22a0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/04 13:32 upstream bc35965f6940 44dda43b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/04 00:44 upstream 8ab1afb2eb24 801f0966 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/04 00:25 upstream 8ab1afb2eb24 801f0966 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/03 16:36 upstream 940de590b839 a8a356ea .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/03 02:54 upstream 940de590b839 6a988719 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/02 22:14 upstream 89a312991dc6 74e93e68 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/09/02 05:27 upstream 89a312991dc6 587f6b29 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ext4_mb_use_inode_pa
2026/01/12 20:13 upstream 54e82e93ca93 d1b870e1 .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
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
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
* Struck through repros no longer work on HEAD.