R10: 0000000000000000 R11: 0000000000000293 R12: 00007f65cc3170c8
R13: 00007f65cc317160 R14: 0000000000000003 R15: 0000000000000000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888008c665c0 by task systemd-udevd/111
CPU: 0 UID: 0 PID: 111 Comm: systemd-udevd Not tainted 6.16.0-rc4-next-20250701 #1 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xca/0x120
print_report+0xcb/0x670
kasan_report+0xca/0x100
kasan_check_range+0x37/0x1a0
flush_tlb_func+0x24d/0x560
__flush_smp_call_function_queue+0x20d/0x740
__sysvec_call_function_single+0x6d/0x360
sysvec_call_function_single+0x5f/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:handle_softirqs+0x174/0x770
Code: c8 83 83 3c 0a 00 00 01 c7 44 24 20 0a 00 00 00 48 89 44 24 18 65 66 c7 05 cf 84 47 06 00 00 e8 22 65 40 00 fb bb ff ff ff ff <48> c7 c5 c0 c0 a0 85 41 0f bc de 83 c3 01 0f 85 9b 00 00 00 e9 8d
RSP: 0018:ffff88806ce08f78 EFLAGS: 00000202
RAX: 000000000033db46 RBX: 00000000ffffffff RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880162cf608 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000280 R15: 0000000000000000
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x70/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x80
Code: 46 03 48 c7 c0 f4 ff ff ff eb 92 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 88 49 0f 06 65 8b 05 99 49 0f 06 a9 00 01 ff 00 74 27
RSP: 0018:ffff8880162cf6b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffea000065abc0 RCX: ffffffff819baa7f
RDX: ffff888016059b80 RSI: ffffffff819baa8d RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000001 R09: fffff940000cb57e
R10: 0000000000000000 R11: 0000000000000001 R12: ffffea000065ab88
R13: dffffc0000000000 R14: ffffea000065abc0 R15: ffff88800a2b1480
PageHuge+0x4d/0x180
copy_page_range+0x11a0/0x4ce0
dup_mmap+0xd2f/0x1d10
copy_process+0x6fac/0x73e0
kernel_clone+0xea/0x820
__do_sys_clone+0xce/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa8ed864bb
Code: ed 0f 85 f8 00 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 41 89 c5 85 c0 0f 85 9e 00 00
RSP: 002b:00007ffc7ce89fc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007faa8ed864bb
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007faa8e8fa8c0
R10: 00007faa8e8fab90 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc7ce8a090 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 281:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x13e/0x470
copy_process+0x6f3a/0x73e0
kernel_clone+0xea/0x820
__do_sys_clone+0xce/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 7940:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3c/0x90
__kasan_slab_free+0x3c/0x60
kmem_cache_free+0x2a5/0x460
mmput+0x305/0x390
do_exit+0x79d/0x2970
do_group_exit+0xd3/0x2a0
get_signal+0x2315/0x2340
arch_do_signal_or_restart+0x80/0x790
exit_to_user_mode_loop+0x8b/0x100
do_syscall_64+0x2f7/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888008c65c40
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888008c65c40, ffff888008c665d8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c60
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888009eb2301
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea0000fc5400 dead000000000003
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff888009eb2301
head: 0100000000000040 ffff888008c4bc80 ffffea0000fc5400 dead000000000003
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff888009eb2301
head: 0100000000000003 ffffea0000231801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888008c66480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888008c66500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888008c66580: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff888008c66600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888008c66680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=39 sclass=netlink_route_socket pid=7961 comm=syz-executor.6
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 216 bytes leftover after parsing attributes in process `syz-executor.6'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 7967 Comm: syz-executor.2 Tainted: G B 6.16.0-rc4-next-20250701 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_node_noprof+0x71/0x470
__alloc_skb+0x2ab/0x370
netlink_dump+0x61e/0x11e0
__netlink_dump_start+0x6c5/0x980
rtnetlink_rcv_msg+0xbb5/0xfc0
netlink_rcv_skb+0x147/0x430
netlink_unicast+0x53d/0x7f0
netlink_sendmsg+0x8ac/0xd80
____sys_sendmsg+0xa67/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmsg+0x150/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe6a6d7eb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe6a42f4188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe6a6e91f60 RCX: 00007fe6a6d7eb19
RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003
RBP: 00007fe6a42f41d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffca5016f3f R14: 00007fe6a42f4300 R15: 0000000000022000
netlink: 20 bytes leftover after parsing attributes in process `syz-executor.7'.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 7972 Comm: syz-executor.7 Tainted: G B 6.16.0-rc4-next-20250701 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
__kmalloc_noprof+0xb4/0x4c0
genl_family_rcv_msg_attrs_parse.constprop.0+0xdb/0x290
genl_family_rcv_msg_doit+0xab/0x2f0
genl_rcv_msg+0x532/0x7e0
netlink_rcv_skb+0x147/0x430
genl_rcv+0x28/0x40
netlink_unicast+0x53d/0x7f0
netlink_sendmsg+0x8ac/0xd80
__sys_sendto+0x506/0x570
__x64_sys_sendto+0xe1/0x1c0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f65ced558ac
Code: fa fa ff ff 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 20 fb ff ff 48 8b
RSP: 002b:00007f65cc317020 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f65cc317110 RCX: 00007f65ced558ac
RDX: 0000000000000020 RSI: 00007f65cc317160 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007f65cc317074 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f65cc3170c8
R13: 00007f65cc317160 R14: 0000000000000003 R15: 0000000000000000
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=39 sclass=netlink_route_socket pid=7976 comm=syz-executor.6
----------------
Code disassembly (best guess):
0: c8 83 83 3c enterq $0x8383,$0x3c
4: 0a 00 or (%rax),%al
6: 00 01 add %al,(%rcx)
8: c7 44 24 20 0a 00 00 movl $0xa,0x20(%rsp)
f: 00
10: 48 89 44 24 18 mov %rax,0x18(%rsp)
15: 65 66 c7 05 cf 84 47 movw $0x0,%gs:0x64784cf(%rip) # 0x64784ee
1c: 06 00 00
1f: e8 22 65 40 00 callq 0x406546
24: fb sti
25: bb ff ff ff ff mov $0xffffffff,%ebx
* 2a: 48 c7 c5 c0 c0 a0 85 mov $0xffffffff85a0c0c0,%rbp <-- trapping instruction
31: 41 0f bc de bsf %r14d,%ebx
35: 83 c3 01 add $0x1,%ebx
38: 0f 85 9b 00 00 00 jne 0xd9
3e: e9 .byte 0xe9
3f: 8d .byte 0x8d