R10: 00007f67c179ec47 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f67c179efc0 R14: 0000000000000000 R15: 00007f67c179ef80
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888016715b80 by task syz-executor.7/7595
CPU: 1 UID: 0 PID: 7595 Comm: syz-executor.7 Not tainted 6.16.0-rc4-next-20250702 #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+0x39/0x1b0
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 b4 47 06 00 00 e8 42 6b 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:ffff88806cf08f78 EFLAGS: 00000206
RAX: 00000000000002fc RBX: 00000000ffffffff RCX: ffffffff817bc5c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880180bfc18 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: ffff88806cf37058 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000200 R15: 0000000000000000
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_call_function_single+0xa6/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 26 31 7b fc e8 e1 e7 a4 fc 48 89 ee 31 ff e8 f7 8b c4 fc e8 92 90 c4 fc e8 9d ba cc fc fb 5b <5d> 41 5c e9 83 90 c4 fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff8880180bfcc8 EFLAGS: 00000206
RAX: 00000000000002f9 RBX: ffffffff85e96fe0 RCX: ffffffff817bc5c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84af0c13
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: ffffffff8530fc40
R13: ffffffff85e96ff0 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
strncpy_from_user+0x3b/0x2f0
getname_flags.part.0+0x8d/0x540
getname_flags+0x95/0xe0
__do_sys_newstat+0x76/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67c4228b16
Code: 28 c3 66 90 48 c7 c0 ff ff ff ff eb e0 e8 f2 29 00 00 66 90 41 89 f8 48 89 f7 48 89 d6 41 83 f8 01 77 29 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 c3 90 48 c7 c2 bc ff ff ff f7 d8 64 89 02
RSP: 002b:00007f67c179eef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00007f67c179ef40 RCX: 00007f67c4228b16
RDX: 00007f67c179efc0 RSI: 00007f67c179efc0 RDI: 00007f67c179ef40
RBP: 00007f67c179f6bc R08: 0000000000000001 R09: 00007f67c179ed90
R10: 00007f67c179ec47 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f67c179efc0 R14: 0000000000000000 R15: 00007f67c179ef80
Allocated by task 7083:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x13c/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 7585:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x38/0x50
kmem_cache_free+0x2a1/0x460
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 ffff888016715200
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888016715200, ffff888016715b98)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16710
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800d49f781
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 0000000000000000 0000000000000001
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800d49f781
head: 0100000000000040 ffff888008c4bc80 0000000000000000 0000000000000001
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800d49f781
head: 0100000000000003 ffffea000059c401 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888016715a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888016715b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888016715b80: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888016715c00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff888016715c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
loop1: detected capacity change from 0 to 16383
loop0: detected capacity change from 0 to 98304
loop4: detected capacity change from 0 to 16383
loop0: detected capacity change from 0 to 98304
loop4: detected capacity change from 0 to 16383
loop7: detected capacity change from 0 to 16383
loop1: detected capacity change from 0 to 18432
loop1: detected capacity change from 0 to 18432
loop0: detected capacity change from 0 to 131072
loop4: detected capacity change from 0 to 18432
loop4: detected capacity change from 0 to 18432
loop0: detected capacity change from 0 to 131072
loop7: detected capacity change from 0 to 16383
loop4: detected capacity change from 0 to 30847
loop1: detected capacity change from 0 to 30847
loop0: detected capacity change from 0 to 163840
loop0: detected capacity change from 0 to 163840
loop1: detected capacity change from 0 to 30847
loop4: detected capacity change from 0 to 30847
loop0: detected capacity change from 0 to 196608
loop7: detected capacity change from 0 to 16383
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 7668 Comm: syz-executor.7 Tainted: G B 6.16.0-rc4-next-20250702 #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_noprof+0x5f/0x470
getname_flags.part.0+0x48/0x540
getname_flags+0x95/0xe0
__do_sys_newstat+0x76/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67c4228b16
Code: 28 c3 66 90 48 c7 c0 ff ff ff ff eb e0 e8 f2 29 00 00 66 90 41 89 f8 48 89 f7 48 89 d6 41 83 f8 01 77 29 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 c3 90 48 c7 c2 bc ff ff ff f7 d8 64 89 02
RSP: 002b:00007f67c179eef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00007f67c179ef40 RCX: 00007f67c4228b16
RDX: 00007f67c179efc0 RSI: 00007f67c179efc0 RDI: 00007f67c179ef40
RBP: 00007f67c179f6bc R08: 0000000000000001 R09: 00007f67c179ed90
R10: 00007f67c179ec47 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f67c179efc0 R14: 0000000000000000 R15: 00007f67c179ef80
----------------
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 b4 47 movw $0x0,%gs:0x647b4cf(%rip) # 0x647b4ee
1c: 06 00 00
1f: e8 42 6b 40 00 callq 0x406b66
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