syzbot


WARNING in ext4_xattr_inode_lookup_create

Status: upstream: reported C repro on 2024/05/28 15:21
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+fe42a669c87e4a980051@syzkaller.appspotmail.com
First crash: 419d, last: 2d15h
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: BUG: unable to handle kernel NULL pointer dereference in ext4_xattr_set_entry (log)
Repro: C syz .config
  
Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly ext4 report (Jun 2025) 0 (1) 2025/06/26 05:37
[PATCH] fs/dcache: fix warning in ext4_xattr_inode_lookup_create 3 (3) 2024/05/29 02:01
[syzbot] [ext4?] WARNING in ext4_xattr_inode_lookup_create 1 (3) 2024/05/29 00:53
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in ext4_xattr_inode_lookup_create origin:upstream -1 C 11 4d03h 39d 0/3 upstream: reported C repro on 2025/06/08 17:41
Last patch testing requests (11)
Created Duration User Patch Repo Result
2025/05/14 22:07 26m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/04/24 04:08 20m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/03/28 04:23 25m retest repro upstream error
2025/03/05 08:36 20m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/02/09 01:33 23m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/01/16 01:11 17m retest repro upstream report log
2024/12/25 08:12 20m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2024/12/01 00:30 28m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2024/09/20 08:12 19m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2024/08/28 18:35 16m retest repro upstream report log
2024/05/29 00:14 23m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8f6a15f095a6 OK log
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/04/09 11:06 5h09m bisect fix upstream OK (0) job log log

Sample crash report:
EXT4-fs warning (device loop0): ext4_xattr_inode_create:1469: refuse to create EA inode when umounting
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5840 at fs/ext4/xattr.c:1470 ext4_xattr_inode_create fs/ext4/xattr.c:1470 [inline]
WARNING: CPU: 0 PID: 5840 at fs/ext4/xattr.c:1470 ext4_xattr_inode_lookup_create+0xa80/0x1c20 fs/ext4/xattr.c:1588
Modules linked in:
CPU: 0 UID: 0 PID: 5840 Comm: syz-executor495 Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ext4_xattr_inode_create fs/ext4/xattr.c:1470 [inline]
RIP: 0010:ext4_xattr_inode_lookup_create+0xa80/0x1c20 fs/ext4/xattr.c:1588
Code: 8b 74 24 10 e9 d4 03 00 00 e8 6c 66 3b ff 48 89 df 48 c7 c6 99 7d 94 8d ba bd 05 00 00 48 c7 c1 40 df 9f 8b e8 11 2a fc ff 90 <0f> 0b 90 49 c7 c7 ea ff ff ff 4c 8b 74 24 10 e9 bb 03 00 00 48 8d
RSP: 0018:ffffc900040ef2e0 EFLAGS: 00010246
RAX: 3b8de81e37430500 RBX: ffff888032ea6000 RCX: 3b8de81e37430500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900040ef470 R08: ffffc900040eeec7 R09: 1ffff9200081ddd8
R10: dffffc0000000000 R11: fffff5200081ddd9 R12: 1ffff9200081de70
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88807811e260
FS:  000055555e8ab380(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc96e14d58 CR3: 00000000117ee000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_xattr_block_set+0x223/0x2ac0 fs/ext4/xattr.c:1908
 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline]
 ext4_expand_extra_isize_ea+0x12d5/0x1ea0 fs/ext4/xattr.c:2822
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6306
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6349 [inline]
 __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6427
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6459
 __mark_inode_dirty+0x2d1/0xdf0 fs/fs-writeback.c:2527
 mark_inode_dirty_sync include/linux/fs.h:2603 [inline]
 iput+0x1ee/0x9d0 fs/inode.c:1921
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1114
 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141
 shrink_dcache_parent+0xa1/0x2c0 fs/dcache.c:-1
 do_one_tree+0x23/0xe0 fs/dcache.c:1604
 shrink_dcache_for_umount+0xa0/0x170 fs/dcache.c:1621
 generic_shutdown_super+0x67/0x2c0 fs/super.c:621
 kill_block_super+0x44/0x90 fs/super.c:1755
 ext4_kill_sb+0x68/0xb0 fs/ext4/super.c:7391
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 ptrace_notify+0x281/0x2c0 kernel/signal.c:2520
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0xc6/0x1d0 kernel/entry/common.c:173
 syscall_exit_to_user_mode_work include/linux/entry-common.h:412 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2ad/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe675380547
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc96e15508 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe675380547
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc96e155c0
RBP: 00007ffc96e155c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffc96e16630
R13: 000055555e8ac6c0 R14: 431bde82d7b634db R15: 00007ffc96e16650
 </TASK>

Crashes (379):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/19 12:45 upstream fb4d33ab452e ed3e87f7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-kasan-gce-root WARNING in ext4_xattr_inode_lookup_create
2025/06/08 08:54 upstream 5b032cac6225 4826c28e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2024/05/24 16:34 upstream 8f6a15f095a6 8f98448e .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root WARNING in ext4_xattr_inode_lookup_create
2025/07/15 02:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 03fcfc4b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-gce-arm64 WARNING in ext4_xattr_inode_lookup_create
2024/12/11 07:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 146ff2c261f3 cfc402b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in ext4_xattr_inode_lookup_create
2024/09/06 07:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci df54f4a16f82 464ac2ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in ext4_xattr_inode_lookup_create
2025/07/12 09:00 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ext4_xattr_inode_lookup_create
2025/07/06 11:36 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/05 22:13 upstream 05df91921da6 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/05 08:04 upstream a79a588fc176 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/04 18:34 upstream 4c06e63b9203 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/04 18:34 upstream 4c06e63b9203 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/04 17:14 upstream 4c06e63b9203 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/04 00:38 upstream 17bbde2e1716 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/03 19:00 upstream 17bbde2e1716 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/03 19:00 upstream 17bbde2e1716 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/03 09:16 upstream b4911fb0b060 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/02 18:49 upstream b4911fb0b060 0cd59a8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/02 13:17 upstream 66701750d556 0cd59a8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/01 17:53 upstream 66701750d556 ffe4b334 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/01 17:52 upstream 66701750d556 ffe4b334 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/07/01 03:10 upstream 66701750d556 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/30 21:02 upstream d0b3b7b22dfa 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/29 22:41 upstream d0b3b7b22dfa fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/29 09:43 upstream dfba48a70cb6 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/28 20:16 upstream aaf724ed6926 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/28 06:16 upstream 35e261cd95dd fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/28 06:16 upstream 35e261cd95dd fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/28 02:31 upstream 35e261cd95dd 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/27 12:57 upstream 67a993863163 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/26 22:44 upstream e34a79b96ab9 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/26 11:21 upstream ee88bddf7f2f 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/26 11:18 upstream ee88bddf7f2f 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/25 03:57 upstream 7595b66ae9de 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/24 16:27 upstream 78f4e737a53e 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/24 11:11 upstream 78f4e737a53e e2f27c35 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/24 01:45 upstream 78f4e737a53e 1a7fb460 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/24 01:41 upstream 78f4e737a53e 1a7fb460 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/23 19:25 upstream 86731a2a651e 1a7fb460 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/23 10:56 upstream 86731a2a651e d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/22 21:29 upstream b67ec639010f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/22 08:01 upstream 739a6c93cc75 d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/22 08:01 upstream 739a6c93cc75 d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/21 20:57 upstream f7301f856d35 d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/21 04:03 upstream 11313e2f7812 d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/21 04:03 upstream 11313e2f7812 d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/20 13:06 upstream 41687a5c6f8b e3003213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/19 17:58 upstream 24770983ccfe ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/19 03:21 upstream fb4d33ab452e ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2025/06/19 03:21 upstream fb4d33ab452e ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ext4_xattr_inode_lookup_create
2024/05/24 15:17 upstream 8f6a15f095a6 8f98448e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in ext4_xattr_inode_lookup_create
2025/07/06 21:29 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ext4_xattr_inode_lookup_create
2025/06/10 00:56 linux-next 475c850a7fdd 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ext4_xattr_inode_lookup_create
2024/11/14 00:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8e9a54d7181b a8c99394 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ext4_xattr_inode_lookup_create
* Struck through repros no longer work on HEAD.