[syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj

[syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    cbbddb6b08cc Merge tag 'power-utilities-2026.10.31' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11fc0581580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bd712e5dbce1d1a0
dashboard link: https://syzkaller.appspot.com/bug?extid=54648a6c1187a7ef46a6
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12f0e62d580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-cbbddb6b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4e9212cb9d41/vmlinux-cbbddb6b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b7710a90cc0c/bzImage-cbbddb6b.xz

AI-generated root cause summary:
In drivers/media/usb/em28xx/em28xx-video.c, if em28xx_v4l2_init() fails after
registering video devices (e.g. during v4l2_mc_create_media_graph()) while
userspace concurrently holds an open file handle to a video device node,
unregister_dev drops the initial v4l2_dev reference but leaves dev->v4l2
non-NULL. When the device disconnects, em28xx_v4l2_fini() is called and
incorrectly drops the initial reference a second time via
v4l2_device_put(&v4l2->v4l2_dev). This refcount underflow causes
em28xx_free_v4l2() to free struct em28xx_v4l2 prematurely, resulting in a slab
use-after-free when userspace closes the file descriptor and
v4l2_device_release() accesses embedded media entities.

full analysis:  https://syzkaller.appspot.com/x/ai_root_cause?x=54648a6c1187a7ef46a6

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+54648a6c1187a7ef46a6@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in media_type include/media/media-entity.h:443 [inline]
BUG: KASAN: slab-use-after-free in dev_dbg_obj+0x630/0x830 drivers/media/mc/mc-entity.c:96
Read of size 4 at addr ffff888023601bd0 by task v4l_id/6384

CPU: 2 UID: 0 PID: 6384 Comm: v4l_id 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
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 media_type include/media/media-entity.h:443 [inline]
 dev_dbg_obj+0x630/0x830 drivers/media/mc/mc-entity.c:96
 media_gobj_destroy drivers/media/mc/mc-entity.c:179 [inline]
 media_gobj_destroy+0x4d/0x240 drivers/media/mc/mc-entity.c:173
 __media_device_unregister_entity+0x20c/0x2f0 drivers/media/mc/mc-device.c:597
 media_device_unregister_entity+0x4b/0x70 drivers/media/mc/mc-device.c:677
 v4l2_device_release+0x363/0x480 drivers/media/v4l2-core/v4l2-dev.c:208
 device_release+0xd2/0x270 drivers/base/core.c:2640
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1f7/0x640 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3886
 video_put drivers/media/v4l2-core/v4l2-dev.c:173 [inline]
 v4l2_release+0x2da/0x390 drivers/media/v4l2-core/v4l2-dev.c:480
 __fput+0x3fb/0xb50 fs/file_table.c:512
 fput_close_sync+0x118/0x250 fs/file_table.c:618
 filp_close_sync+0x75/0xa0 fs/open.c:1573
 __do_sys_close fs/open.c:1596 [inline]
 __se_sys_close fs/open.c:1583 [inline]
 __x64_sys_close+0x81/0x110 fs/open.c:1583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb504ca7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffe26ad6260 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007fb5053c2880 RCX: 00007fb504ca7407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fb5053c26e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013
R13: 00007ffe26ad6490 R14: 00007fb505529000 R15: 0000564e446754d8
 </TASK>

Allocated by task 34:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:409 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5680
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 em28xx_v4l2_init.cold+0x94/0x3a7f drivers/media/usb/em28xx/em28xx-video.c:2751
 em28xx_init_extension+0x13a/0x200 drivers/media/usb/em28xx/em28xx-core.c:1245
 request_module_async+0x1e/0x30 drivers/media/usb/em28xx/em28xx-cards.c:3723
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495
 process_scheduled_works kernel/workqueue.c:3578 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3659
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888023600000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 7120 bytes inside of
 freed 8192-byte region [ffff888023600000, ffff888023602000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23600
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801d443180 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801d443180 dead000000000100 dead000000000122
head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5812, tgid 5812 (syz-executor), ts 73629010596
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1856
 prep_new_page mm/page_alloc.c:1864 [inline]
 get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3935
 __alloc_frozen_pages_noprof+0x2bd/0x3280 mm/page_alloc.c:5444
 alloc_slab_page mm/slub.c:3384 [inline]
 allocate_slab mm/slub.c:3499 [inline]
 new_slab+0xb1/0x6d0 mm/slub.c:3550
 refill_objects+0xe3/0x410 mm/slub.c:7539
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_noprof+0x677/0x840 mm/slub.c:5556
 _kmalloc_noprof include/linux/slab.h:995 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 ops_init+0x77/0x5f0 net/core/net_namespace.c:127
 setup_net+0x118/0x3a0 net/core/net_namespace.c:443
 copy_net_ns+0x340/0x7a0 net/core/net_namespace.c:584
 create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0xf6/0x210 kernel/nsproxy.c:234
 ksys_unshare+0x44f/0x980 kernel/fork.c:3298
 __do_sys_unshare kernel/fork.c:3364 [inline]
 __se_sys_unshare kernel/fork.c:3362 [inline]
 __ia32_sys_unshare+0x30/0x40 kernel/fork.c:3362
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x14b/0x8c0 arch/x86/entry/syscall_32.c:282
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:307
page last free pid 5501 tgid 5501 ts 24218447288 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1403 [inline]
 __free_frozen_pages+0x7b4/0x1110 mm/page_alloc.c:2954
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:5033 [inline]
 kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5105
 __alloc_skb+0x140/0x710 net/core/skbuff.c:705
 alloc_skb include/linux/skbuff.h:1390 [inline]
 alloc_skb_with_frags+0xdb/0x750 net/core/skbuff.c:6898
 sock_alloc_send_pskb+0x86a/0x9e0 net/core/sock.c:3093
 unix_dgram_sendmsg+0x3f4/0x1a80 net/unix/af_unix.c:2148
 unix_seqpacket_sendmsg+0x12a/0x1d0 net/unix/af_unix.c:2549
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:818 [inline]
 sock_write_iter+0x560/0x5d0 net/socket.c:1269
 do_iter_readv_writev+0x6f7/0x930 fs/read_write.c:828
 vfs_writev+0x360/0xdd0 fs/read_write.c:1058
 do_writev+0x28a/0x340 fs/read_write.c:1104
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888023601a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888023601b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888023601b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888023601c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888023601c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Forwarded: [PATCH] media: em28xx: fix v4l2 use-after-free after failed init

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH] media: em28xx: fix v4l2 use-after-free after failed init
Author: drifabdelmalekmohamedsaid@gmail.com

#syz test
---
 drivers/media/usb/em28xx/em28xx-video.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/em28xx/em28xx-video.c b/drivers/media/usb/em28xx/em28xx-video.c
index 84424284d486..924a3f7977c9 100644
--- a/drivers/media/usb/em28xx/em28xx-video.c
+++ b/drivers/media/usb/em28xx/em28xx-video.c
@@ -2414,7 +2414,7 @@ static int em28xx_v4l2_open(struct file *filp)
  */
 static int em28xx_v4l2_fini(struct em28xx *dev)
 {
-	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	struct em28xx_v4l2 *v4l2;
 
 	if (dev->is_audio_only) {
 		/* Shouldn't initialize IR for this interface */
@@ -2426,13 +2426,17 @@ static int em28xx_v4l2_fini(struct em28xx *dev)
 		return 0;
 	}
 
-	if (!v4l2)
-		return 0;
-
 	dev_info(&dev->intf->dev, "Closing video extension\n");
 
 	mutex_lock(&dev->lock);
 
+	/* matches em28xx_v4l2_init error paths */
+	v4l2 = dev->v4l2;
+	if (!v4l2){
+		mutex_unlock(&dev->lock);
+		return 0;
+	}
+
 	v4l2_device_disconnect(&v4l2->v4l2_dev);
 
 	em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
@@ -3129,6 +3133,9 @@ static int em28xx_v4l2_init(struct em28xx *dev)
 		vb2_video_unregister_device(&v4l2->vdev);
 	}
 
+	/* matches check in em28xx_v4l2_fini (under the same lock) */
+	dev->v4l2 = NULL;
+
 	mutex_unlock(&dev->lock);
 
 	/*
-- 
2.43.0

Re: [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in v4l2_open

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 3 UID: 0 PID: 8236 Comm: v4l_id 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 e9 8e 5f 68 09 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc900079d76a0 EFLAGS: 00010082
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8bee97ca RDI: dffffc0000000019
RBP: 00000000000000c8 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff926ad55f R11: 0000000000000000 R12: ffffffff8bee97ca
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f73db395880(0000) GS:ffff888095581000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056143b44d64d CR3: 000000006c150000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __kasan_check_byte+0x13/0x50 mm/kasan/common.c:584
 kasan_check_byte include/linux/kasan.h:402 [inline]
 lock_acquire kernel/locking/lockdep.c:5916 [inline]
 lock_acquire+0x132/0x380 kernel/locking/lockdep.c:5899
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:181
 ida_free+0xd3/0x2f0 lib/idr.c:566
 __media_device_unregister_entity+0x70/0x2f0 drivers/media/mc/mc-device.c:582
 media_device_unregister_entity+0x4b/0x70 drivers/media/mc/mc-device.c:677
 v4l2_device_release+0x363/0x480 drivers/media/v4l2-core/v4l2-dev.c:208
 device_release+0xd2/0x270 drivers/base/core.c:2640
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1f7/0x640 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3886
 video_put drivers/media/v4l2-core/v4l2-dev.c:173 [inline]
 v4l2_open+0x2e5/0x490 drivers/media/v4l2-core/v4l2-dev.c:450
 chrdev_open+0x234/0x6a0 fs/char_dev.c:413
 do_dentry_open+0x674/0x1470 fs/open.c:1000
 vfs_open_consume+0xcc/0x460 fs/open.c:1131
 do_open fs/namei.c:4851 [inline]
 path_openat+0x1547/0x23f0 fs/namei.c:5016
 do_file_open+0x20e/0x430 fs/namei.c:5045
 do_sys_openat2+0x163/0x1d0 fs/open.c:1442
 do_sys_open fs/open.c:1448 [inline]
 __do_sys_openat fs/open.c:1464 [inline]
 __se_sys_openat fs/open.c:1459 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1459
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f73daca7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff8d33df10 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f73db395880 RCX: 00007f73daca7407
RDX: 0000000000000000 RSI: 00007fff8d33ef1d RDI: ffffffffffffff9c
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fff8d33e160 R14: 00007f73db4fc000 R15: 000056143b4514d8
 </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 e9 8e 5f 68 09 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc900079d76a0 EFLAGS: 00010082
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8bee97ca RDI: dffffc0000000019
RBP: 00000000000000c8 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff926ad55f R11: 0000000000000000 R12: ffffffff8bee97ca
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f73db395880(0000) GS:ffff888095581000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056143b44d64d CR3: 000000006c150000 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:	e9 8e 5f 68 09       	jmp    0x9685fc5
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)


Tested on:

commit:         46fec1c3 Merge tag 'sched-urgent-2026-11-01' of git://..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152fb935580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f4b0888d27d9a541
dashboard link: https://syzkaller.appspot.com/bug?extid=54648a6c1187a7ef46a6
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1222acb1580000