[syzbot] [ntfs3?] [usb?] general protection fault in rtlock_slowlock_locked

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 99bade344cfa Merge tag 'rust-fixes-6.17' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15f513a2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=98e114f4eb77e551
dashboard link: https://syzkaller.appspot.com/bug?extid=08df3e4c9b304b37cb04
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/309f13a7cc12/disk-99bade34.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d782186486b/vmlinux-99bade34.xz
kernel image: https://storage.googleapis.com/syzbot-assets/174f592d16e2/bzImage-99bade34.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+08df3e...@syzkaller.appspotmail.com

loop7: detected capacity change from 0 to 4096
Oops: general protection fault, probably for non-canonical address 0xffdffc0000000148: 0000 [#1] SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0xff00000000000a40-0xff00000000000a47]
CPU: 0 UID: 0 PID: 11227 Comm: syz.7.607 Tainted: G W 6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
RIP: 0010:do_raw_spin_lock+0x78/0x290 kernel/locking/spinlock_debug.c:115
Code: aa 9c 81 48 8d 4c 24 20 48 c1 e9 03 48 b8 f1 f1 f1 f1 04 f3 f3 f3 48 89 4c 24 18 4a 89 04 39 4c 8d 77 04 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 9f 01 00 00 41 8b 06 3d ad 4e ad de 0f
RSP: 0018:ffffc900049ff4c0 EFLAGS: 00010807
RAX: 1fe0000000000148 RBX: ff00000000000a40 RCX: 1ffff9200093fe9c
RDX: 0000000000000000 RSI: ffffffff8b620b60 RDI: ff00000000000a40
RBP: ffffc900049ff570 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10053788b9 R12: ffff88808316a1b0
R13: ff00000000000000 R14: ff00000000000a44 R15: dffffc0000000000
FS: 00007f7f773fe6c0(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f79182020 CR3: 000000005aace000 CR4: 00000000003526f0
Call Trace:
<TASK>
task_blocks_on_rt_mutex kernel/locking/rtmutex.c:1265 [inline]
rtlock_slowlock_locked+0x8ef/0x4010 kernel/locking/rtmutex.c:1851
rtlock_slowlock kernel/locking/rtmutex.c:1895 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x152/0x2c0 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:44 [inline]
iput_final fs/inode.c:1886 [inline]
iput+0x5c1/0x9d0 fs/inode.c:1923
ntfs_fill_super+0x38fa/0x40b0 fs/ntfs3/super.c:1514
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
do_mount fs/namespace.c:4133 [inline]
__do_sys_mount fs/namespace.c:4344 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4321
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f791a038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7f773fde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7f773fdef0 RCX: 00007f7f791a038a
RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00007f7f773fdeb0
RBP: 0000200000000080 R08: 00007f7f773fdef0 R09: 0000000002010c10
R10: 0000000002010c10 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f7f773fdeb0 R14: 000000000001f743 R15: 0000200000000380
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
RIP: 0010:do_raw_spin_lock+0x78/0x290 kernel/locking/spinlock_debug.c:115
Code: aa 9c 81 48 8d 4c 24 20 48 c1 e9 03 48 b8 f1 f1 f1 f1 04 f3 f3 f3 48 89 4c 24 18 4a 89 04 39 4c 8d 77 04 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 9f 01 00 00 41 8b 06 3d ad 4e ad de 0f
RSP: 0018:ffffc900049ff4c0 EFLAGS: 00010807
RAX: 1fe0000000000148 RBX: ff00000000000a40 RCX: 1ffff9200093fe9c
RDX: 0000000000000000 RSI: ffffffff8b620b60 RDI: ff00000000000a40
RBP: ffffc900049ff570 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10053788b9 R12: ffff88808316a1b0
R13: ff00000000000000 R14: ff00000000000a44 R15: dffffc0000000000
FS: 00007f7f773fe6c0(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f79182020 CR3: 000000005aace000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: aa stos %al,%es:(%rdi)
1: 9c pushf
2: 81 48 8d 4c 24 20 48 orl $0x4820244c,-0x73(%rax)
9: c1 e9 03 shr $0x3,%ecx
c: 48 b8 f1 f1 f1 f1 04 movabs $0xf3f3f304f1f1f1f1,%rax
13: f3 f3 f3
16: 48 89 4c 24 18 mov %rcx,0x18(%rsp)
1b: 4a 89 04 39 mov %rax,(%rcx,%r15,1)
1f: 4c 8d 77 04 lea 0x4(%rdi),%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 9f 01 00 00 jne 0x1d6
37: 41 8b 06 mov (%r14),%eax
3a: 3d ad 4e ad de cmp $0xdead4ead,%eax
3f: 0f .byte 0xf


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: da32d155f4a8 Merge tag 'gpio-fixes-for-v6.18-rc5' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=118faa58580000
kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=08df3e4c9b304b37cb04
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103d4412580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/811f765ca0a8/disk-da32d155.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1f6516907c8f/vmlinux-da32d155.xz
kernel image: https://storage.googleapis.com/syzbot-assets/45682ff9dc9c/bzImage-da32d155.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/cb5a9fd06f24/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=13312a92580000)
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/d496dd2d1446/mount_6.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=1516117c580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+08df3e...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
Read of size 1 at addr ffff888030dcba68 by task ksoftirqd/1/30

CPU: 1 UID: 0 PID: 30 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:580
kasan_check_byte include/linux/kasan.h:401 [inline]
lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5842
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
rtlock_slowlock_locked+0x3821/0x4010 kernel/locking/rtmutex.c:1871

rtlock_slowlock kernel/locking/rtmutex.c:1895 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]

rt_spin_lock+0x158/0x3e0 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:44 [inline]
__wake_up_common_lock+0x2f/0x1e0 kernel/sched/wait.c:124
blk_update_request+0x57e/0xe60 block/blk-mq.c:998
blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1160
blk_complete_reqs block/blk-mq.c:1235 [inline]
blk_done_softirq+0x10a/0x160 block/blk-mq.c:1240
handle_softirqs+0x22f/0x710 kernel/softirq.c:622
run_ksoftirqd+0xac/0x210 kernel/softirq.c:1063
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

Allocated by task 7682:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:262 [inline]
__kmalloc_cache_noprof+0x1ef/0x6c0 mm/slub.c:5767
kmalloc_noprof include/linux/slab.h:957 [inline]
lbmLogInit fs/jfs/jfs_logmgr.c:1821 [inline]
lmLogInit+0x3db/0x19e0 fs/jfs/jfs_logmgr.c:1269
open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline]
lmLogOpen+0x4e1/0xfa0 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0xe9/0x670 fs/jfs/jfs_mount.c:257
jfs_fill_super+0x754/0xd80 fs/jfs/super.c:532
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
vfs_get_tree+0x92/0x2b0 fs/super.c:1751
fc_mount fs/namespace.c:1208 [inline]
do_new_mount_fc fs/namespace.c:3651 [inline]
do_new_mount+0x302/0xa10 fs/namespace.c:3727
do_mount fs/namespace.c:4050 [inline]
__do_sys_mount fs/namespace.c:4238 [inline]
__se_sys_mount+0x313/0x410 fs/namespace.c:4215
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5925:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
__kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2539 [inline]
slab_free mm/slub.c:6634 [inline]
kfree+0x197/0x950 mm/slub.c:6841
lbmLogShutdown fs/jfs/jfs_logmgr.c:1864 [inline]
lmLogShutdown+0x441/0x830 fs/jfs/jfs_logmgr.c:1683
lmLogClose+0x28a/0x520 fs/jfs/jfs_logmgr.c:1459
jfs_umount+0x2ef/0x3c0 fs/jfs/jfs_umount.c:114
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x135/0x2c0 fs/super.c:642
kill_block_super+0x44/0x90 fs/super.c:1722
deactivate_locked_super+0xbc/0x130 fs/super.c:473
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1327
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888030dcba00
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 104 bytes inside of
freed 256-byte region [ffff888030dcba00, ffff888030dcbb00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x30dca
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88813ff26b40 ffffea000157d380 dead000000000003
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88813ff26b40 ffffea000157d380 dead000000000003
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 0080000000000001 ffffea0000c37281 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5919, tgid 5919 (syz-executor), ts 100669428717, free_ts 100657311754
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3055 [inline]
allocate_slab+0x96/0x350 mm/slub.c:3228
new_slab mm/slub.c:3282 [inline]
___slab_alloc+0xb10/0x1400 mm/slub.c:4651
__slab_alloc+0xc6/0x1f0 mm/slub.c:4774
__slab_alloc_node mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:5272 [inline]
__do_kmalloc_node mm/slub.c:5645 [inline]
__kmalloc_noprof+0x14b/0x7d0 mm/slub.c:5658
kmalloc_noprof include/linux/slab.h:961 [inline]
kmalloc_array_noprof include/linux/slab.h:1003 [inline]
security_inode_init_security+0x107/0x3f0 security/security.c:1868
__ext4_new_inode+0x3314/0x3cb0 fs/ext4/ialloc.c:1325
ext4_mkdir+0x3cb/0xc50 fs/ext4/namei.c:3007
vfs_mkdir+0x306/0x510 fs/namei.c:4453
do_mkdirat+0x247/0x590 fs/namei.c:4486
__do_sys_mkdir fs/namei.c:4508 [inline]
__se_sys_mkdir fs/namei.c:4506 [inline]
__x64_sys_mkdir+0x6c/0x80 fs/namei.c:4506
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 20 tgid 20 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xfb6/0x1140 mm/page_alloc.c:2906
mm_free_pgd kernel/fork.c:541 [inline]
__mmdrop+0xb5/0x4f0 kernel/fork.c:683
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core kernel/rcu/tree.c:2861 [inline]
rcu_cpu_kthread+0xbf6/0x1b50 kernel/rcu/tree.c:2949
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
ffff888030dcb900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888030dcb980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888030dcba00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888030dcba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888030dcbb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
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.

[Hillf Danton]

> Date: Fri, 07 Nov 2025 20:01:26 -0800

> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: da32d155f4a8 Merge tag 'gpio-fixes-for-v6.18-rc5' of git:/..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=118faa58580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
> dashboard link: https://syzkaller.appspot.com/bug?extid=08df3e4c9b304b37cb04
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103d4412580000

#syz test

--- x/fs/jfs/jfs_logmgr.c
+++ y/fs/jfs/jfs_logmgr.c
@@ -149,6 +149,7 @@ do { \
* of log page
*/
#define lbmDIRECT 0x0100
+#define lbmInflight 0x0200

/*
* Global list of active external journals
@@ -1861,6 +1862,8 @@ static void lbmLogShutdown(struct jfs_lo
while (lbuf) {
struct lbuf *next = lbuf->l_freelist;
__free_page(lbuf->l_page);
+ while (lbuf->l_flag & lbmInflight)
+ schedule_timeout_idle(HZ);
kfree(lbuf);
lbuf = next;
}
@@ -2130,6 +2133,7 @@ static void lbmStartIO(struct lbuf * bp)
bio->bi_iter.bi_size = 0;
lbmIODone(bio);
} else {
+ bp->l_flag |= lbmInflight;
submit_bio(bio);
INCREMENT(lmStat.submitted);
}
@@ -2226,6 +2230,7 @@ static void lbmIODone(struct bio *bio)
if (bp->l_flag & lbmDIRECT) {
LCACHE_WAKEUP(&bp->l_ioevent);
LCACHE_UNLOCK(flags);
+ bp->l_flag &= ~lbmInflight;
return;
}

@@ -2305,6 +2310,7 @@ static void lbmIODone(struct bio *bio)

LCACHE_UNLOCK(flags); /* unlock+enable */
}
+ bp->l_flag &= ~lbmInflight;
}

int jfsIOWait(void *arg)
--

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+08df3e...@syzkaller.appspotmail.com
Tested-by: syzbot+08df3e...@syzkaller.appspotmail.com

Tested on:

commit: e811c33b Merge tag 'drm-fixes-2025-11-08' of https://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15c5117c580000

kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=08df3e4c9b304b37cb04
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

patch: https://syzkaller.appspot.com/x/patch.diff?x=11746a58580000

Note: testing is done by a robot and is best-effort only.