WARNING: kmalloc bug in wnd_init

Status: upstream: reported C repro on 2025/01/07 22:35
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+8511e1e3d2273756d2fd@syzkaller.appspotmail.com
First crash: 566d, last: 70d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/01/08 linux-5.15.y (ToT) 91786f140358 C [report] WARNING: kmalloc bug in wnd_init
2025/01/08 upstream (ToT) 09a0fa92e5b4 C Didn't crash
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING: kmalloc bug in wnd_init origin:lts-only -1 C inconclusive 1 558d 604d 0/3 upstream: reported C repro on 2024/12/01 00:31
upstream WARNING: kmalloc bug in wnd_init ntfs3 -1 C done 3 728d 874d 28/29 fixed on 2024/11/12 23:31
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/05/18 18:27 16m retest repro linux-5.15.y report log
2026/03/09 05:50 11m retest repro linux-5.15.y report log
2025/12/28 19:43 10m retest repro linux-5.15.y report log
2025/10/19 09:57 11m retest repro linux-5.15.y report log
2025/08/09 00:27 10m retest repro linux-5.15.y report log
2025/05/29 20:36 15m retest repro linux-5.15.y report log
2025/03/20 11:29 12m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (9)
Created Duration User Patch Repo Result
2026/06/06 22:07 12m fix candidate upstream error job log
2026/03/27 18:11 1m fix candidate upstream error job log
2026/02/25 12:22 1m fix candidate upstream error job log
2026/01/25 01:38 1m fix candidate upstream error job log
2025/12/25 22:59 43m fix candidate upstream error job log
2025/11/23 12:14 3m fix candidate upstream error job log
2025/09/20 18:46 24m fix candidate upstream error job log
2025/03/30 08:36 1m fix candidate upstream error job log
2025/01/15 18:00 1h00m fix candidate upstream error job log

Sample crash report:
loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS' sector size (1024) and media sector size (512)
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4019 at mm/util.c:630 kvmalloc_node+0x1fc/0x204
Modules linked in:
CPU: 0 PID: 4019 Comm: syz-executor121 Not tainted 5.15.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : kvmalloc_node+0x1fc/0x204
lr : kvmalloc_node+0x1f8/0x204 mm/util.c:630
sp : ffff80001f9f7770
x29: ffff80001f9f7770 x28: 1fffe0001b8a6468 x27: dfff800000000000
x26: 1ffffffffff80008 x25: 1fffe0001b8a6803 x24: 0000000000008000
x23: 0000000000000000 x22: ffff800009627fb8 x21: 0003ffffffffff02
x20: 00000000ffffffff x19: 0000000000000dc0 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800011b4eaf8 x15: 000000000000000b
x14: 1ffff0000296e06c x13: dfff800000000000 x12: 0000000000000005
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff0000ca4c3680
x8 : ffff80000876d260 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 00000000ffffffff x4 : 0000000000012dc0 x3 : 0004000000000000
x2 : 0003ffffffffff02 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 kvmalloc_node+0x1fc/0x204
 kvmalloc include/linux/mm.h:805 [inline]
 kvmalloc_array include/linux/mm.h:823 [inline]
 wnd_init+0x18c/0x2b0 fs/ntfs3/bitmap.c:670
 ntfs_fill_super+0x1d48/0x33b0 fs/ntfs3/super.c:1053
 get_tree_bdev+0x360/0x54c fs/super.c:1325
 ntfs_fs_get_tree+0x28/0x38 fs/ntfs3/super.c:1354
 vfs_get_tree+0x90/0x274 fs/super.c:1530
 do_new_mount+0x278/0x8fc fs/namespace.c:3012
 path_mount+0x594/0x101c fs/namespace.c:3342
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount fs/namespace.c:3540 [inline]
 __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 12248
hardirqs last  enabled at (12247): [<ffff800008a75b7c>] bh_lru_install fs/buffer.c:1261 [inline]
hardirqs last  enabled at (12247): [<ffff800008a75b7c>] __find_get_block+0xb68/0xdd4 fs/buffer.c:1312
hardirqs last disabled at (12248): [<ffff800011b4a1ac>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (11280): [<ffff8000080309b8>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (11278): [<ffff800008030984>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace a09334cf1f19f974 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/07 22:35 linux-5.15.y 91786f140358 f3558dbf .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING: kmalloc bug in wnd_init
* Struck through repros no longer work on HEAD.