R10: 0000000000001000 R11: 0000000000000293 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020000278 R15: 0000000000000005
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888007083cc0 by task syz-executor.2/19114
CPU: 0 UID: 0 PID: 19114 Comm: syz-executor.2 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: 00000206
RAX: 0000000000062728 RBX: 00000000ffffffff RCX: ffffffff817bbfa6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880394efa18 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:finish_task_switch.isra.0+0x20f/0x840
Code: 4c 89 ff 48 c7 03 00 00 00 00 e8 3c 9b 73 03 4d 85 e4 75 ba 4c 89 ff e8 9f 81 73 03 e8 fa cd 34 00 fb 65 48 8b 1d 79 ed 3b 06 <48> 8d bb f0 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffff8880394efac0 EFLAGS: 00000202
RAX: 0000000000062725 RBX: ffff888016c01b80 RCX: ffffffff817bbfa6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8146f296
RBP: ffff8880394efb00 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: ffff88806ce36f18
R13: ffff88800afdb700 R14: ffff88806ce36f00 R15: ffff88806ce36f00
__schedule+0xe4e/0x3520
schedule+0xdb/0x390
do_nanosleep+0x15e/0x560
hrtimer_nanosleep+0x13a/0x340
common_nsleep+0xaa/0xd0
__x64_sys_clock_nanosleep+0x331/0x470
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f92d725d8e1
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f
RSP: 002b:00007fff235f0f40 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000079 RCX: 00007f92d725d8e1
RDX: 00007fff235f0f80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff235f100c R08: 0000000000000000 R09: 00007f92d7328000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 00000000001a2cfc R14: 0000000000000000 R15: 00007fff235f1070
Allocated by task 19860:
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 27081:
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 ffff888007083340
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888007083340, ffff888007083cd8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7080
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800d44fd01
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800d44fd01
head: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800d44fd01
head: 0100000000000003 ffffea00001c2001 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888007083b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888007083c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888007083c80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff888007083d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888007083d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
loop5: detected capacity change from 0 to 512
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 27086 Comm: syz-executor.1 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
copy_folio_from_iter_atomic+0x3d3/0x1820
generic_perform_write+0x1e9/0x820
shmem_file_write_iter+0x111/0x140
vfs_write+0xbe9/0x10c0
__x64_sys_pwrite64+0x1f1/0x260
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35382b9ab7
Code: 08 89 3c 24 48 89 4c 24 18 e8 e5 f8 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 12 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 15 f9 ff ff 48 8b
RSP: 002b:00007f353587bf20 EFLAGS: 00000293 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f3538350970 RCX: 00007f35382b9ab7
RDX: 0000000000002020 RSI: 0000000020010400 RDI: 0000000000000004
RBP: 0000000000000015 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000002000 R11: 0000000000000293 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020000260 R15: 0000000000000004
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
ext4 filesystem being mounted at /syzkaller-testdir398672670/syzkaller.TdE8rG/529/file0 supports timestamps until 2038-01-19 (0x7fffffff)
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
Bluetooth: hci4: unexpected cc 0x0c03 length: 249 > 1
Bluetooth: hci4: unexpected cc 0x1003 length: 249 > 9
Bluetooth: hci4: unexpected cc 0x1001 length: 249 > 9
Bluetooth: hci4: unexpected cc 0x0c23 length: 249 > 4
Bluetooth: hci4: unexpected cc 0x0c38 length: 249 > 2
Bluetooth: hci4: command tx timeout
Bluetooth: hci4: command tx timeout
Bluetooth: hci4: command tx timeout
----------------
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