R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000000004 R14: 0000000020000320 R15: 0000000000000004
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88803d813cc0 by task systemd-udevd/113
CPU: 1 UID: 0 PID: 113 Comm: systemd-udevd 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:ffff88806cf08f78 EFLAGS: 00000202
RAX: 00000000019a4b5e RBX: 00000000ffffffff RCX: ffffffff817bbfa6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880160b7b88 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+0x70/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:avc_lookup+0xe3/0x1d0
Code: 49 83 ec 28 0f 84 c1 00 00 00 e8 f8 ef 4f ff 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 74 08 3c 03 0f 8e b6 00 00 00 45 8b 3c 24 <89> ef 44 89 fe e8 43 ea 4f ff 44 39 fd 75 99 e8 c9 ef 4f ff 49 8d
RSP: 0018:ffff8880160b7c30 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff82240d70
RDX: ffff888016158000 RSI: ffffffff8223a688 RDI: ffffffff886f1770
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88800b948a90
R13: 000000000000000a R14: 000000000000002b R15: 0000000000000001
avc_has_perm_noaudit+0x9b/0x3d0
avc_has_perm+0xa4/0x1d0
selinux_inode_readlink+0x2a6/0x3b0
security_inode_readlink+0xa6/0xf0
do_readlinkat.part.0+0x163/0x340
__x64_sys_readlinkat+0xb7/0x100
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f39f6126b2a
Code: 48 8b 0d 69 d3 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 0b 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 36 d3 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007fff3d6cbfd8 EFLAGS: 00000202 ORIG_RAX: 000000000000010b
RAX: ffffffffffffffda RBX: 0000000000001001 RCX: 00007f39f6126b2a
RDX: 000055f5345f34b0 RSI: 00007fff3d6cc060 RDI: 00000000ffffff9c
RBP: 000055f5345f34b0 R08: 000055f5345f34b0 R09: 00007f39f61f4be0
R10: 0000000000001000 R11: 0000000000000202 R12: 00007fff3d6cc060
R13: 00000000ffffff9c R14: 0000000000000001 R15: 0000000000001000
Allocated by task 281:
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 9811:
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 ffff88803d813340
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88803d813340, ffff88803d813cd8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3d810
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800c765f01
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea00004ee800 dead000000000004
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800c765f01
head: 0100000000000040 ffff888008c4bc80 ffffea00004ee800 dead000000000004
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800c765f01
head: 0100000000000003 ffffea0000f60401 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88803d813b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803d813c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803d813c80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff88803d813d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803d813d80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
loop2: detected capacity change from 0 to 512
EXT4-fs (loop2): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop2): group descriptors corrupted!
loop5: detected capacity change from 0 to 512
EXT4-fs (loop5): failed to parse options in superblock: Nq*e{
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
loop3: detected capacity change from 0 to 512
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 9830 Comm: syz-executor.7 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
getname_flags.part.0+0x48/0x540
getname_flags+0x95/0xe0
do_sys_openat2+0x9f/0x1b0
__x64_sys_openat+0x142/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59b7f30a04
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff 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 c8 f9 ff ff 8b 44
RSP: 002b:00007f59b54f2ed0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f59b7fc7970 RCX: 00007f59b7f30a04
RDX: 0000000000000002 RSI: 00007f59b54f3000 RDI: 00000000ffffff9c
RBP: 00007f59b54f3000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000000004 R14: 0000000020000320 R15: 0000000000000004
loop2: detected capacity change from 0 to 512
loop6: detected capacity change from 0 to 512
loop5: detected capacity change from 0 to 512
loop1: detected capacity change from 0 to 512
EXT4-fs (loop3): VFS: Can't find ext4 filesystem
EXT4-fs (loop6): failed to parse options in superblock: Nq*e{oeF{}䵉 >RsWND!9tY"B$Gڼh^
EXT4-fs (loop2): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop5): failed to parse options in superblock: Nq*e{
EXT4-fs (loop2): group descriptors corrupted!
EXT4-fs (loop1): VFS: Can't find ext4 filesystem
EXT4-fs (loop6): corrupt root inode, run e2fsck
EXT4-fs (loop6): mount failed
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): VFS: Can't find ext4 filesystem
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
loop1: detected capacity change from 0 to 512
EXT4-fs (loop1): VFS: Can't find ext4 filesystem
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 9852 Comm: syz-executor.6 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
strncpy_from_user+0x3b/0x2f0
getname_flags.part.0+0x8d/0x540
getname_flags+0x95/0xe0
do_sys_openat2+0x9f/0x1b0
__x64_sys_openat+0x142/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa7c1e21a04
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff 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 c8 f9 ff ff 8b 44
RSP: 002b:00007fa7bf3e3ed0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fa7c1eb8970 RCX: 00007fa7c1e21a04
RDX: 0000000000000002 RSI: 00007fa7bf3e4000 RDI: 00000000ffffff9c
RBP: 00007fa7bf3e4000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000000004 R14: 0000000020000320 R15: 0000000000000004
loop3: detected capacity change from 0 to 512
EXT4-fs (loop3): VFS: Can't find ext4 filesystem
----------------
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