==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882
Read of size 8 at addr ffff8880231027e8 by task syz-executor846/3526
CPU: 0 PID: 3526 Comm: syz-executor846 Not tainted 5.15.152-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
__lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4030
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1737
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__might_sleep+0x7/0xc0 kernel/sched/core.c:9567
Code: e1 07 38 c1 0f 8c a8 fe ff ff 4c 89 ff e8 21 f8 70 00 e9 9b fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 41 57 41 56 41 55 <41> 54 53 41 89 d6 41 89 f7 49 89 fc 49 bd 00 00 00 00 00 fc ff df
RSP: 0018:ffffc900022f7a18 EFLAGS: 00000246
RAX: ffffc900022f7b00 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000000023d RDI: ffffffff8a8b03e0
RBP: ffffc900022f7bc0 R08: dffffc0000000000 R09: ffffc900022f7b00
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
__mutex_lock_common+0xd4/0x25a0 kernel/locking/mutex.c:573
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
wait_sb_inodes fs/fs-writeback.c:2590 [inline]
sync_inodes_sb+0x334/0xab0 fs/fs-writeback.c:2773
sync_filesystem+0x16b/0x220 fs/sync.c:64
generic_shutdown_super+0x6e/0x2c0 fs/super.c:448
kill_block_super+0x7a/0xe0 fs/super.c:1414
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f3dbc4ae4b7
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc591fa4d8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00000000000499fd RCX: 00007f3dbc4ae4b7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc591fa590
RBP: 00007ffc591fa590 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc591fb5f0
R13: 00005555558826c0 R14: 0000000000000020 R15: 431bde82d7b634db
Allocated by task 2:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:894
copy_process+0x5eb/0x3ef0 kernel/fork.c:2038
kernel_clone+0x210/0x960 kernel/fork.c:2604
kernel_thread+0x168/0x1e0 kernel/fork.c:2656
create_kthread kernel/kthread.c:342 [inline]
kthreadd+0x57a/0x740 kernel/kthread.c:686
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Freed by task 14:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
rcu_do_batch kernel/rcu/tree.c:2523 [inline]
rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2763
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
Last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3007 [inline]
call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087
context_switch kernel/sched/core.c:5033 [inline]
__schedule+0x12cc/0x45b0 kernel/sched/core.c:6376
schedule+0x11b/0x1f0 kernel/sched/core.c:6459
exit_to_user_mode_loop+0x44/0x130 kernel/entry/common.c:163
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
Second to last potentially related work creation:
kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3007 [inline]
call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087
release_task+0x16b6/0x1750
wait_task_zombie kernel/exit.c:1179 [inline]
wait_consider_task+0x1994/0x2e50 kernel/exit.c:1406
do_wait_thread kernel/exit.c:1469 [inline]
do_wait+0x30c/0xaf0 kernel/exit.c:1586
kernel_wait4+0x29e/0x3e0 kernel/exit.c:1749
__do_sys_wait4 kernel/exit.c:1777 [inline]
__se_sys_wait4 kernel/exit.c:1773 [inline]
__x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1773
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff888023101dc0
which belongs to the cache task_struct of size 7360
The buggy address is located 2600 bytes inside of
7360-byte region [ffff888023101dc0, ffff888023103a80)
The buggy address belongs to the page:
page:ffffea00008c4000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23100
head:ffffea00008c4000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011de93c0
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
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 640, ts 8775449648, free_ts 0
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256
alloc_task_struct_node kernel/fork.c:171 [inline]
dup_task_struct+0x57/0xb60 kernel/fork.c:894
copy_process+0x5eb/0x3ef0 kernel/fork.c:2038
kernel_clone+0x210/0x960 kernel/fork.c:2604
kernel_thread+0x168/0x1e0 kernel/fork.c:2656
call_usermodehelper_exec_work+0x58/0x220 kernel/umh.c:174
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
page_owner free stack trace missing
Memory state around the buggy address:
ffff888023102680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023102700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888023102780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888023102800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023102880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: e1 07 loope 0x9
2: 38 c1 cmp %al,%cl
4: 0f 8c a8 fe ff ff jl 0xfffffeb2
a: 4c 89 ff mov %r15,%rdi
d: e8 21 f8 70 00 call 0x70f833
12: e9 9b fe ff ff jmp 0xfffffeb2
17: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
1e: 00 00 00
21: 66 90 xchg %ax,%ax
23: 55 push %rbp
24: 41 57 push %r15
26: 41 56 push %r14
28: 41 55 push %r13
* 2a: 41 54 push %r12 <-- trapping instruction
2c: 53 push %rbx
2d: 41 89 d6 mov %edx,%r14d
30: 41 89 f7 mov %esi,%r15d
33: 49 89 fc mov %rdi,%r12
36: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
3d: fc ff df