R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffca338898f R14: 00007fe2f43d6300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888015e613c0 by task syz-executor.0/15042
CPU: 0 UID: 0 PID: 15042 Comm: syz-executor.0 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:ffff88806ce08f78 EFLAGS: 00000206
RAX: 0000000000000588 RBX: 00000000ffffffff RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff88803f67f598 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000200 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:unwind_next_frame+0xc94/0x2540
Code: c1 ea 03 80 3c 02 00 0f 85 7a 17 00 00 4c 89 c0 49 c7 47 68 00 00 00 00 48 be 00 00 00 00 00 fc ff df 48 c1 e8 03 0f b6 14 30 <49> 8d 40 01 48 89 c7 48 c1 ef 03 0f b6 34 37 4c 89 c7 83 e7 07 40
RSP: 0018:ffff88803f67f648 EFLAGS: 00000213
RAX: 1ffffffff0d12dcd RBX: 0000000000000001 RCX: ffffffff86896e68
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff88803f67f720
RBP: ffff88803f67f710 R08: ffffffff86896e6c R09: ffff88803f67f6f8
R10: 000000000003bb04 R11: 00000000000259ed R12: ffff88803f67f718
R13: ffff88803f67f700 R14: ffff88803f67fb10 R15: ffff88803f67f6b8
arch_stack_walk+0x86/0xf0
stack_trace_save+0x8e/0xc0
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x13c/0x470
__alloc_object+0x2f/0x2d0
__create_object+0x1d/0x80
__kmalloc_cache_noprof+0x3ad/0x470
kmem_cache_free+0x12d/0x460
exit_mmap+0x47f/0xaa0
mmput+0xd5/0x390
do_exit+0x79d/0x2970
do_group_exit+0xd3/0x2a0
__x64_sys_exit_group+0x3e/0x50
x64_sys_call+0x18b4/0x18c0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb04176fb19
Code: Unable to access opcode bytes at 0x7fb04176faef.
RSP: 002b:00007fb03ece5088 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb04176fb19
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00007fb0417bac30 R08: 000000000000000c R09: 00007fb03ece5300
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000e
R13: 00007ffd5d518adf R14: 00007fb03ece5300 R15: 0000000000022000
Allocated by task 15046:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x13c/0x470
mm_alloc+0x1d/0xd0
alloc_bprm+0x2e3/0x6e0
kernel_execve+0xb0/0x3d0
call_usermodehelper_exec_async+0x25f/0x4e0
ret_from_fork+0x34b/0x430
ret_from_fork_asm+0x1a/0x30
Freed by task 15046:
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
__x64_sys_exit_group+0x3e/0x50
x64_sys_call+0x18b4/0x18c0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888015e60a40
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888015e60a40, ffff888015e613d8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15e60
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88801bd41481
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 dead000000000100 dead000000000122
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801bd41481
head: 0100000000000040 ffff888008c4bc80 dead000000000100 dead000000000122
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801bd41481
head: 0100000000000003 ffffea0000579801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888015e61280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888015e61300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888015e61380: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff888015e61400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888015e61480: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 15061 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
_copy_from_user+0x30/0xd0
copy_msghdr_from_user+0x88/0x150
___sys_recvmsg+0xbb/0x190
do_recvmmsg+0x2c5/0x6f0
__x64_sys_recvmmsg+0x211/0x260
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2f6e60b19
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:00007fe2f43d6188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fe2f6f73f60 RCX: 00007fe2f6e60b19
RDX: 00000000000001f8 RSI: 0000000020000dc0 RDI: 0000000000000003
RBP: 00007fe2f43d61d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffca338898f R14: 00007fe2f43d6300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 15080 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
_copy_from_user+0x30/0xd0
copy_msghdr_from_user+0x88/0x150
___sys_recvmsg+0xbb/0x190
do_recvmmsg+0x2c5/0x6f0
__x64_sys_recvmmsg+0x211/0x260
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2f6e60b19
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:00007fe2f43d6188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fe2f6f73f60 RCX: 00007fe2f6e60b19
RDX: 00000000000001f8 RSI: 0000000020000dc0 RDI: 0000000000000003
RBP: 00007fe2f43d61d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffca338898f R14: 00007fe2f43d6300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 15099 Comm: syz-executor.6 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
security_inode_alloc+0x3e/0x130
inode_init_always_gfp+0xc94/0xff0
alloc_inode+0x8d/0x250
sock_alloc+0x40/0x270
__sock_create+0xc1/0x810
__sys_socketpair+0x1c7/0x570
__x64_sys_socketpair+0x97/0x100
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4919e97b19
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:00007f491740d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f4919faaf60 RCX: 00007f4919e97b19
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 00007f491740d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffde1ea14cf R14: 00007f491740d300 R15: 0000000000022000
socket: no more sockets
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 15110 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
_copy_from_user+0x30/0xd0
copy_msghdr_from_user+0x88/0x150
___sys_recvmsg+0xbb/0x190
do_recvmmsg+0x2c5/0x6f0
__x64_sys_recvmmsg+0x211/0x260
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2f6e60b19
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:00007fe2f43d6188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fe2f6f73f60 RCX: 00007fe2f6e60b19
RDX: 00000000000001f8 RSI: 0000000020000dc0 RDI: 0000000000000003
RBP: 00007fe2f43d61d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffca338898f R14: 00007fe2f43d6300 R15: 0000000000022000
----------------
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