R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc1e82f3cf R14: 00007f029de2b300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88800e4c7000 by task syz-executor.5/286
CPU: 1 UID: 0 PID: 286 Comm: syz-executor.5 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+0xa1/0xc0
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: 0000:ffff8880175cfec0 EFLAGS: 00000206
RAX: 0000000000051e88 RBX: 00000000ffffffff RCX: ffffffff817bbfa6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880175cff58 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000200 R15: 0000000000000000
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x39/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f92041cb626
Code: 01 00 00 40 48 89 ee bf ff ff ff ff e8 43 19 05 00 39 c3 0f 84 0d 01 00 00 bf e8 03 00 00 e8 51 34 05 00 48 8b 05 5a fd 09 01 <4c> 89 fe bf 01 00 00 00 4c 8b 25 53 fd 09 01 48 8d 14 40 48 b8 cd
RSP: 002b:00007ffe225aa3f0 EFLAGS: 00000206
RAX: 0000000000001388 RBX: 000000000000005c RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe225aa44c R08: 0000000000000000 R09: 00007f920430e000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000032
R13: 000000000004f2c6 R14: 0000000000000004 R15: 00007ffe225aa4b0
Allocated by task 4360:
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 5309:
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 ffff88800e4c6680
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88800e4c6680, ffff88800e4c7018)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe4c0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800e44db81
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea0000f3cc00 dead000000000003
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800e44db81
head: 0100000000000040 ffff888008c4bc80 ffffea0000f3cc00 dead000000000003
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800e44db81
head: 0100000000000003 ffffea0000393001 00000000ffffffff 00000000ffffffff
head: ffff88800e4c1f50 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800e4c6f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88800e4c6f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88800e4c7000: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88800e4c7080: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff88800e4c7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current]
sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present
sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 40 00
blk_print_req_error: 361 callbacks suppressed
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 32 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 5 prio class 0
buffer_io_error: 398 callbacks suppressed
Buffer I/O error on dev sr0, logical block 16, async page read
Buffer I/O error on dev sr0, logical block 17, async page read
Buffer I/O error on dev sr0, logical block 18, async page read
Buffer I/O error on dev sr0, logical block 19, async page read
Buffer I/O error on dev sr0, logical block 20, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 21 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 21, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 22 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 22, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 23 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 23, async page read
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 5363 Comm: syz-executor.3 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_noprof+0x5f/0x470
mas_alloc_nodes+0x432/0x8f0
mas_node_count_gfp+0x106/0x140
mas_preallocate+0x2af/0x690
__split_vma+0x304/0xde0
vma_modify+0x16fb/0x2030
vma_modify_flags+0x1b0/0x250
mlock_fixup+0x1b5/0xda0
apply_vma_lock_flags+0x252/0x380
do_mlock+0x2ac/0x800
__x64_sys_mlock2+0xc1/0x100
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02a08b5b19
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:00007f029de2b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000145
RAX: ffffffffffffffda RBX: 00007f02a09c8f60 RCX: 00007f02a08b5b19
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000
RBP: 00007f029de2b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc1e82f3cf R14: 00007f029de2b300 R15: 0000000000022000
sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current]
sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present
sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 40 00
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 32 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 16, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 17 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 17, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 18 op 0x0:(READ) flags 0x0 phys_seg 6 prio class 0
Buffer I/O error on dev sr0, logical block 18, async page read
Buffer I/O error on dev sr0, logical block 19, async page read
Buffer I/O error on dev sr0, logical block 20, async page read
Buffer I/O error on dev sr0, logical block 21, async page read
Buffer I/O error on dev sr0, logical block 22, async page read
Buffer I/O error on dev sr0, logical block 23, async page read
----------------
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