R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdb42abb0f R14: 00007ff8d5bc7300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888017763280 by task systemd-journal/98
CPU: 0 UID: 0 PID: 98 Comm: systemd-journal Not tainted 6.16.0-rc4-next-20250630 #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 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: 000000000012fd58 RBX: 00000000ffffffff RCX: ffffffff817bbfa6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff888015a078d8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 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_const_cmp1+0x8/0x20
Code: bf 06 00 00 00 e9 a8 fe ff ff 0f 1f 84 00 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 0c 24 <40> 0f b6 d6 40 0f b6 f7 bf 01 00 00 00 e9 76 fe ff ff 66 0f 1f 44
RSP: 0018:ffff888015a07980 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888009039d60 RCX: ffffffff81b831ed
RDX: ffff888013f85280 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888015a07c70 R08: 0000000000000000 R09: ffffed10012073c3
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
R13: ffff888015a07c78 R14: ffff888015a07c48 R15: ffff888015a07c38
try_to_unlazy+0x10d/0x660
lookup_fast+0x2b7/0x5e0
walk_component+0x5e/0x5b0
link_path_walk+0x62b/0xe20
path_openat+0x22e/0x2880
do_filp_open+0x1e8/0x450
do_sys_openat2+0x104/0x1b0
__x64_sys_openat+0x142/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59e0803c64
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 36 61 f9 ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 68 61 f9 ff 8b 44
RSP: 002b:00007fff92bf6c50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055871c918d60 RCX: 00007f59e0803c64
RDX: 0000000000080802 RSI: 000055871c9287e0 RDI: 00000000ffffff9c
RBP: 000055871c9287e0 R08: 0000000000000000 R09: ffffffffffffff01
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000080802
R13: 00000000fffffffa R14: 000055871c95be50 R15: 0000000000000002
loop1: detected capacity change from 0 to 10
Allocated by task 285:
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 10082:
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+0xf76/0x18a0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888017762900
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888017762900, ffff888017763298)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17760
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800c554401
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea00003e4c00 dead000000000003
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800c554401
head: 0100000000000040 ffff888008c4bc80 ffffea00003e4c00 dead000000000003
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800c554401
head: 0100000000000003 ffffea00005dd801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888017763180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888017763200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888017763280: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888017763300: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff888017763380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
loop0: detected capacity change from 0 to 264192
loop7: detected capacity change from 0 to 236
loop7: detected capacity change from 0 to 236
loop0: detected capacity change from 0 to 264192
loop1: detected capacity change from 0 to 10
loop7: detected capacity change from 0 to 1
loop7: detected capacity change from 0 to 1
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 10165 Comm: syz-executor.3 Tainted: G B 6.16.0-rc4-next-20250630 #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+0xb4/0x4b0
security_inode_init_security+0x13d/0x390
__ext4_new_inode+0x3378/0x4b90
ext4_symlink+0x406/0xb40
vfs_symlink+0x3fe/0x680
do_symlinkat+0x144/0x300
__x64_sys_symlinkat+0x93/0xc0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8d8651b19
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:00007ff8d5bc7188 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007ff8d8764f60 RCX: 00007ff8d8651b19
RDX: 0000000020000080 RSI: ffffffffffffff9c RDI: 0000000020000000
RBP: 00007ff8d5bc71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdb42abb0f R14: 00007ff8d5bc7300 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 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