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Internal error in fat_ioctl_filldir

Status: auto-obsoleted due to no activity on 2025/11/05 20:59
Reported-by: syzbot+882fe45f876e5615e624@syzkaller.appspotmail.com
First crash: 204d, last: 187d

Sample crash report:
loop3: detected capacity change from 0 to 128
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4191 Comm: syz.3.12 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : fat_ioctl_filldir+0x28c/0xdf4 fs/fat/dir.c:759
lr : fat_ioctl_filldir+0x268/0xdf4 fs/fat/dir.c:759
sp : ffff80001fee7970
x29: ffff80001fee79a0 x28: dfff800000000000 x27: 00000000200010aa
x26: 1ffff00003fdcf8b x25: 1fffe0001a302004 x24: ffff800011439ae0
x23: 00000000fffffff2 x22: ffff0000d1810024 x21: ffff0000d1810000
x20: 000000200010aa00 x19: ffff80001fee7c58 x18: 0000000000000000
x17: ffff800016d04000 x16: ffff800008e3dc94 x15: ffff8000167e4500
x14: ffff0000d1810a00 x13: dfff800000000000 x12: 0000000000ff0100
x11: 0000000000000000 x10: 00000000200010aa x9 : 0000ffffffffffff
x8 : 00000000200010aa x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff800016ea3920 x4 : 0000000000000008 x3 : ffff8000082bfb8c
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 fat_ioctl_filldir+0x28c/0xdf4 fs/fat/dir.c:759
 dir_emit_dot include/linux/fs.h:3717 [inline]
 dir_emit_dots include/linux/fs.h:3728 [inline]
 __fat_readdir+0x24c/0x132c fs/fat/dir.c:576
 fat_ioctl_readdir fs/fat/dir.c:777 [inline]
 fat_dir_ioctl+0x280/0x36c fs/fat/dir.c:815
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __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+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f7 2a1f03e0 38000957 (2a1703e1) 
---[ end trace 3937994f8b768bb1 ]---
----------------
Code disassembly (best guess):
   0:	d503229f 	csdb
   4:	2a1f03f7 	mov	w23, wzr
   8:	2a1f03e0 	mov	w0, wzr
   c:	38000957 	sttrb	w23, [x10]
* 10:	2a1703e1 	mov	w1, w23 <-- trapping instruction

Crashes (30):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/27 20:58 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/27 20:56 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/27 12:17 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/27 12:15 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/27 03:03 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/27 03:03 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/23 04:03 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/23 03:47 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/23 03:47 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/22 16:30 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/22 16:29 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/21 21:07 linux-5.15.y c79648372d02 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/21 20:08 linux-5.15.y c79648372d02 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/21 15:44 linux-5.15.y c79648372d02 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/21 00:14 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/20 23:22 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/20 23:21 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/17 15:30 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/17 15:28 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/16 20:22 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/16 20:22 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/15 19:38 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/15 19:38 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/14 06:29 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/14 06:27 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/12 11:29 linux-5.15.y c79648372d02 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/12 11:29 linux-5.15.y c79648372d02 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/10 05:40 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/10 05:38 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
2025/08/10 03:17 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in fat_ioctl_filldir
* Struck through repros no longer work on HEAD.