vkms_vblank_simulate: vblank timer overrun
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff888030798018 by task modprobe/6735
CPU: 3 UID: 0 PID: 6735 Comm: modprobe Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
__kasan_check_byte+0x36/0x50 mm/kasan/common.c:557
kasan_check_byte include/linux/kasan.h:399 [inline]
lock_acquire kernel/locking/lockdep.c:5840 [inline]
lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5823
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
p9_tag_remove net/9p/client.c:397 [inline]
p9_req_put net/9p/client.c:405 [inline]
p9_req_put+0xaf/0x250 net/9p/client.c:402
req_done+0x1dc/0x2e0 net/9p/trans_virtio.c:147
vring_interrupt drivers/virtio/virtio_ring.c:2715 [inline]
vring_interrupt+0x31b/0x400 drivers/virtio/virtio_ring.c:2690
__handle_irq_event_percpu+0x229/0x7d0 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq arch/x86/kernel/irq.c:254 [inline]
call_irq_handler arch/x86/kernel/irq.c:266 [inline]
__common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:292
common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:285
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:handle_mm_fault+0x4a2/0xad0 mm/memory.c:6338
Code: ff 41 89 dc 31 ff 41 81 e4 00 04 00 00 44 89 e6 e8 43 f2 b1 ff 45 85 e4 0f 84 3d 01 00 00 e8 f5 f6 b1 ff 89 d8 48 83 c4 28 5b <5d> 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 db f6 b1 ff 48 b8 00
RSP: 0000:ffffc90007e2fe88 EFLAGS: 00000292
RAX: 0000000000000200 RBX: 0000000000000006 RCX: ffffffff82095a84
RDX: ffff888053672440 RSI: ffffffff820958fb RDI: ffff888053672bd8
RBP: ffff888053672440 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888034240f10 R14: 0000000000000040 R15: 0000000000000000
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f5c288e5ad6
Code: 48 8d 0d 1d fa 00 00 ba 16 02 00 00 48 8d 35 4c c4 00 00 48 8d 3d 64 c4 00 00 e9 22 fe ff ff 4c 8b 40 10 48 83 c0 18 49 01 f8 <4c> 89 06 eb c0 48 83 3d 9d 81 01 00 00 75 44 48 8d 0d 44 fd 00 00
RSP: 002b:00007ffeacf611f0 EFLAGS: 00010206
RAX: 00007f5c288cecf0 RBX: 00007f5c288cfa28 RCX: 00007f5c288ce510
RDX: 00007f5c288cfa70 RSI: 00007f5c288fb5c0 RDI: 00007f5c288ce000
RBP: 00007ffeacf612a0 R08: 00007f5c288f46e8 R09: 00007f5c288fced0
R10: 00007f5c288dfc40 R11: 000000006fffff41 R12: 00007ffeacf612b0
R13: 00007ffeacf61230 R14: 00007ffeacf61230 R15: 00000000effffef5
Allocated by task 6736:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
p9_client_create+0xc7/0x11c0 net/9p/client.c:985
v9fs_session_init+0x1f7/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc5/0xa30 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8b/0x340 fs/super.c:1759
do_new_mount fs/namespace.c:3881 [inline]
path_mount+0x14d4/0x1f30 fs/namespace.c:4208
do_mount fs/namespace.c:4221 [inline]
__do_sys_mount fs/namespace.c:4432 [inline]
__se_sys_mount fs/namespace.c:4409 [inline]
__x64_sys_mount+0x28d/0x310 fs/namespace.c:4409
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6736:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2398 [inline]
slab_free mm/slub.c:4656 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4855
p9_client_create+0xa28/0x11c0 net/9p/client.c:1064
v9fs_session_init+0x1f7/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc5/0xa30 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8b/0x340 fs/super.c:1759
do_new_mount fs/namespace.c:3881 [inline]
path_mount+0x14d4/0x1f30 fs/namespace.c:4208
do_mount fs/namespace.c:4221 [inline]
__do_sys_mount fs/namespace.c:4432 [inline]
__se_sys_mount fs/namespace.c:4409 [inline]
__x64_sys_mount+0x28d/0x310 fs/namespace.c:4409
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888030798000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff888030798000, ffff888030798200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x30798
head: order:2 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 ffff88801b442c80 ffffea0000951d00 dead000000000002
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b442c80 ffffea0000951d00 dead000000000002
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000c1e601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5367, tgid 5367 (udevd), ts 23867042852, free_ts 23212154824
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2468 [inline]
allocate_slab mm/slub.c:2632 [inline]
new_slab+0x244/0x340 mm/slub.c:2686
___slab_alloc+0xd9c/0x1940 mm/slub.c:3872
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3962
__slab_alloc_node mm/slub.c:4037 [inline]
slab_alloc_node mm/slub.c:4198 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4367
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kernfs_fop_open+0x244/0xda0 fs/kernfs/file.c:623
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
page last free pid 5363 tgid 5363 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x799/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffff888030797f00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888030797f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888030798000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888030798080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888030798100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: ff 41 89 incl -0x77(%rcx)
3: dc 31 fdivl (%rcx)
5: ff 41 81 incl -0x7f(%rcx)
8: e4 00 in $0x0,%al
a: 04 00 add $0x0,%al
c: 00 44 89 e6 add %al,-0x1a(%rcx,%rcx,4)
10: e8 43 f2 b1 ff call 0xffb1f258
15: 45 85 e4 test %r12d,%r12d
18: 0f 84 3d 01 00 00 je 0x15b
1e: e8 f5 f6 b1 ff call 0xffb1f718
23: 89 d8 mov %ebx,%eax
25: 48 83 c4 28 add $0x28,%rsp
29: 5b pop %rbx
* 2a: 5d pop %rbp <-- trapping instruction
2b: 41 5c pop %r12
2d: 41 5d pop %r13
2f: 41 5e pop %r14
31: 41 5f pop %r15
33: c3 ret
34: cc int3
35: cc int3
36: cc int3
37: cc int3
38: e8 db f6 b1 ff call 0xffb1f718
3d: 48 rex.W
3e: b8 .byte 0xb8