* [syzbot] [fs?] general protection fault in start_dirop
@ 2026-07-29 0:19 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-07-29 0:19 UTC (permalink / raw)
To: dakr, driver-core, gregkh, linux-fsdevel, linux-kernel, rafael,
syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 62cc90241548 Merge tag 'mm-hotfixes-stable-2026-07-27-14-1..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13377fde580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=1e3d934ee3cff1ac188b
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111916b9580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10aa0aea580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-62cc9024.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b10a9ae7e3d1/vmlinux-62cc9024.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b89124d39495/bzImage-62cc9024.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1e3d934ee3cff1ac188b@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000028: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000140-0x0000000000000147]
CPU: 3 UID: 0 PID: 6582 Comm: syz.0.150 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210
Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc900030274b0 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81e53a84 RDI: dffffc0000000028
RBP: 0000000000000140 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81e53a84
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
FS: 00007f68146b06c0(0000) GS:ffff8880d60dc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a63fff CR3: 000000002ca1c000 CR4: 0000000000352ef0
Call Trace:
<TASK>
__kasan_check_byte+0x13/0x50 mm/kasan/common.c:573
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire kernel/locking/lockdep.c:5842 [inline]
lock_acquire+0x132/0x370 kernel/locking/lockdep.c:5825
down_write_nested+0x94/0x200 kernel/locking/rwsem.c:1757
inode_lock_nested include/linux/fs.h:1069 [inline]
__start_dirop fs/namei.c:2918 [inline]
start_dirop+0x4b/0xb0 fs/namei.c:2942
simple_start_creating+0xf9/0x110 fs/libfs.c:2305
debugfs_start_creating.part.0+0x82/0x170 fs/debugfs/inode.c:394
debugfs_start_creating fs/debugfs/inode.c:371 [inline]
debugfs_create_dir+0x72/0x440 fs/debugfs/inode.c:572
i2c_device_probe+0x5f5/0xd10 drivers/i2c/i2c-core-base.c:588
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
__device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x64/0x160 drivers/base/bus.c:620
device_add+0x121d/0x1970 drivers/base/core.c:3772
i2c_new_client_device+0x660/0xd30 drivers/i2c/i2c-core-base.c:1019
new_device_store+0x20f/0x420 drivers/i2c/i2c-core-base.c:1307
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f681379de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f68146b0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6813a25fa0 RCX: 00007f681379de99
RDX: 000000000000000c RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007f6813833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6813a26038 R14: 00007f6813a25fa0 R15: 00007fff65603768
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210
Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc900030274b0 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81e53a84 RDI: dffffc0000000028
RBP: 0000000000000140 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81e53a84
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
FS: 00007f68146b06c0(0000) GS:ffff8880d60dc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a63fff CR3: 000000002ca1c000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 0f 1f 00 nopl (%rax)
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 0f 1f 40 d6 nopl -0x2a(%rax)
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 c1 ef 03 shr $0x3,%rdi
27: 48 01 c7 add %rax,%rdi
* 2a: 0f b6 07 movzbl (%rdi),%eax <-- trapping instruction
2d: 3c 07 cmp $0x7,%al
2f: 0f 96 c0 setbe %al
32: c3 ret
33: cc int3
34: cc int3
35: cc int3
36: cc int3
37: 66 data16
38: 66 data16
39: 2e cs
3a: 0f .byte 0xf
3b: 1f (bad)
3c: 84 00 test %al,(%rax)
---
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2026-07-29 0:19 [syzbot] [fs?] general protection fault in start_dirop syzbot
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