R10: 0000000000000002 R11: 0000000000000246 R12: 0000000008100000
R13: 0000000020000100 R14: 0000000000020000 R15: 0000000020000340
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888014e62840 by task ksoftirqd/1/22
CPU: 1 UID: 0 PID: 22 Comm: ksoftirqd/1 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+0xa1/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:unwind_next_frame+0x10/0x2540
Code: 26 bf 79 00 e9 3a ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 41 57 <48> 89 fa 49 89 ff 41 56 48 c1 ea 03 41 55 41 54 55 53 48 83 ec 38
RSP: 0018:ffff8880097478b8 EFLAGS: 00000202
RAX: dffffc0000000000 RBX: ffffffff81604fe0 RCX: ffff88800974781c
RDX: 1ffff110012e8f43 RSI: ffffffff81aec888 RDI: ffff8880097478c8
RBP: ffff888009747960 R08: ffffffff86891100 R09: ffff888009747908
R10: 000000000003bb04 R11: 0000000000024a58 R12: ffff888009747990
R13: 0000000000000000 R14: ffff88800972b700 R15: ffff88800ee28a68
arch_stack_walk+0x86/0xf0
stack_trace_save+0x8e/0xc0
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
rcu_core+0x7c8/0x1790
handle_softirqs+0x1b1/0x770
run_ksoftirqd+0x2e/0x60
smpboot_thread_fn+0x41d/0x9d0
kthread+0x3c8/0x740
ret_from_fork+0x34b/0x430
ret_from_fork_asm+0x1a/0x30
Allocated by task 281:
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 8809:
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 ffff888014e61ec0
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888014e61ec0, ffff888014e62858)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14e60
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888009b96101
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea0000576200 dead000000000002
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff888009b96101
head: 0100000000000040 ffff888008c4bc80 ffffea0000576200 dead000000000002
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff888009b96101
head: 0100000000000003 ffffea0000539801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888014e62700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888014e62780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888014e62800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff888014e62880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888014e62900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
loop6: detected capacity change from 0 to 256
FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop6): error, fat_get_cluster: invalid cluster chain (i_pos 1)
FAT-fs (loop6): Filesystem has been set read-only
loop1: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 288
No source specified
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 8845 Comm: syz-executor.5 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
__kmalloc_noprof+0xb4/0x4b0
genl_family_rcv_msg_attrs_parse.constprop.0+0xdb/0x290
genl_family_rcv_msg_doit+0xab/0x2f0
genl_rcv_msg+0x532/0x7e0
netlink_rcv_skb+0x147/0x430
genl_rcv+0x28/0x40
netlink_unicast+0x53d/0x7f0
netlink_sendmsg+0x8ac/0xd80
____sys_sendmsg+0xa67/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmsg+0x150/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdbd359b19
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:00007fbdba8cf188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbdbd46cf60 RCX: 00007fbdbd359b19
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00007fbdba8cf1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe6cc6f0df R14: 00007fbdba8cf300 R15: 0000000000022000
FAT-fs (loop1): error, invalid access to FAT (entry 0x000000ff)
FAT-fs (loop1): Filesystem has been set read-only
loop6: detected capacity change from 0 to 256
FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop6): error, fat_get_cluster: invalid cluster chain (i_pos 1)
FAT-fs (loop6): Filesystem has been set read-only
loop6: detected capacity change from 0 to 256
FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop6): error, fat_get_cluster: invalid cluster chain (i_pos 1)
FAT-fs (loop6): Filesystem has been set read-only
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 8863 Comm: syz-executor.3 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_lru_noprof+0x73/0x460
ext4_alloc_inode+0x28/0x600
alloc_inode+0x67/0x250
new_inode+0x1e/0x160
__ext4_new_inode+0x35a/0x4b90
ext4_mkdir+0x331/0xb30
vfs_mkdir+0x59a/0x8d0
do_mkdirat+0x19f/0x3d0
__x64_sys_mkdir+0xf3/0x140
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f535a6c27
Code: 73 01 c3 48 c7 c1 bc ff ff ff 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 b8 53 00 00 00 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:00007f1f50b1cfa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1f535a6c27
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000300
RBP: 00007f1f50b1d040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000200002c0
R13: 0000000020000300 R14: 00007f1f50b1d000 R15: 0000000020000740
loop0: detected capacity change from 0 to 288
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop6: detected capacity change from 0 to 256
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8876 Comm: syz-executor.1 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_fail_alloc_page+0xe0/0x110
prepare_alloc_pages+0x1af/0x500
__alloc_frozen_pages_noprof+0x17f/0x1f10
alloc_pages_mpol+0xed/0x340
folio_alloc_mpol_noprof+0x38/0x2a0
shmem_alloc_folio+0x11b/0x140
shmem_get_folio_gfp.constprop.0+0x4ea/0x13a0
shmem_write_begin+0x147/0x2e0
generic_perform_write+0x3a4/0x820
shmem_file_write_iter+0x111/0x140
vfs_write+0xbe9/0x10c0
__x64_sys_pwrite64+0x1f1/0x260
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9936e22ab7
Code: 08 89 3c 24 48 89 4c 24 18 e8 e5 f8 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 12 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 15 f9 ff ff 48 8b
RSP: 002b:00007f99343e4f20 EFLAGS: 00000293 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f9936eb9970 RCX: 00007f9936e22ab7
RDX: 000000000000002d RSI: 0000000020010000 RDI: 0000000000000004
RBP: 0000000000000002 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020000200 R15: 0000000000000000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 8879 Comm: syz-executor.5 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_node_noprof+0x71/0x470
__alloc_skb+0x2ab/0x370
netlink_ack+0x167/0xbf0
netlink_rcv_skb+0x344/0x430
genl_rcv+0x28/0x40
netlink_unicast+0x53d/0x7f0
netlink_sendmsg+0x8ac/0xd80
____sys_sendmsg+0xa67/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmsg+0x150/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdbd359b19
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:00007fbdba8cf188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbdbd46cf60 RCX: 00007fbdbd359b19
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00007fbdba8cf1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe6cc6f0df R14: 00007fbdba8cf300 R15: 0000000000022000
FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop6): error, fat_get_cluster: invalid cluster chain (i_pos 1)
FAT-fs (loop6): Filesystem has been set read-only
loop1: detected capacity change from 0 to 256
FAT-fs (loop1): bogus number of reserved sectors
FAT-fs (loop1): Can't find a valid FAT filesystem
No source specified
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 79 00 jns 0x2
2: e9 3a ff ff ff jmpq 0xffffff41
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: f3 0f 1e fa endbr64
1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
23: fc ff df
26: 41 57 push %r15
* 28: 48 89 fa mov %rdi,%rdx <-- trapping instruction
2b: 49 89 ff mov %rdi,%r15
2e: 41 56 push %r14
30: 48 c1 ea 03 shr $0x3,%rdx
34: 41 55 push %r13
36: 41 54 push %r12
38: 55 push %rbp
39: 53 push %rbx
3a: 48 83 ec 38 sub $0x38,%rsp