==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88800dc013c0 by task syz-executor.5/7097
CPU: 0 UID: 0 PID: 7097 Comm: syz-executor.5 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:generic_exec_single+0x1dd/0x2c0
Code: e8 e8 82 13 00 31 f6 48 89 ef e8 be d7 ff ff 4c 89 ef e8 a6 68 52 03 31 f6 48 89 ef e8 4c d9 ff ff e8 27 81 13 00 fb 45 31 e4 ae fe ff ff e8 09 57 0b 00 90 0f 0b 90 e9 45 ff ff ff 4c 89 f7
RSP: 0018:ffff888037227af0 EFLAGS: 00000246
RAX: 00000000000000f1 RBX: 0000000000000200 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81684589
RBP: ffffffff81845d20 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888037227c28 R14: ffff888037227b68 R15: ffff8880168d3714
smp_call_function_single+0x327/0x420
task_function_call+0xe4/0x170
perf_install_in_context+0x2ca/0x570
__do_sys_perf_event_open+0x19a6/0x2c60
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd48357b19
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:00007fbd458cd188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fbd4846af60 RCX: 00007fbd48357b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00007fbd483b1f6d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd3b24b71f R14: 00007fbd458cd300 R15: 0000000000022000
Allocated by task 283:
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 7085:
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 ffff88800dc00a40
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88800dc00a40, ffff88800dc013d8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xdc00
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800a040601
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea0000231800 dead000000000002
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800a040601
head: 0100000000000040 ffff888008c4bc80 ffffea0000231800 dead000000000002
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800a040601
head: 0100000000000003 ffffea0000370001 00000000ffffffff 00000000ffffffff
head: ffff88800dc01de0 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800dc01280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88800dc01300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88800dc01380: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff88800dc01400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88800dc01480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
EXT4-fs warning (device loop3): ext4_update_dynamic_rev:1125: updating to rev 1 because of new feature flag, running e2fsck is recommended
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 7095 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
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x5f/0x470
ptlock_alloc+0x21/0x70
pte_alloc_one+0x86/0x360
__pte_alloc+0x6c/0x360
__handle_mm_fault+0x24bf/0x30f0
handle_mm_fault+0x2c3/0x900
__get_user_pages+0x58a/0x2f10
populate_vma_page_range+0x282/0x410
__mm_populate+0x100/0x3a0
do_mlock+0x445/0x800
__x64_sys_mlock2+0xc1/0x100
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd7b566b19
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:00007fbd78adc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000145
RAX: ffffffffffffffda RBX: 00007fbd7b679f60 RCX: 00007fbd7b566b19
RDX: 0000000000000000 RSI: 000000000000a000 RDI: 0000000020ff6000
RBP: 00007fbd78adc1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd503a92bf R14: 00007fbd78adc300 R15: 0000000000022000
loop6: detected capacity change from 0 to 11
FAT-fs (loop6): error, corrupted directory (invalid entries)
FAT-fs (loop6): Filesystem has been set read-only
FAT-fs (loop6): error, corrupted directory (invalid entries)
EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.
loop6: detected capacity change from 0 to 11
FAT-fs (loop6): error, corrupted directory (invalid entries)
FAT-fs (loop6): Filesystem has been set read-only
FAT-fs (loop6): error, corrupted directory (invalid entries)
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 06 00
blk_print_req_error: 105 callbacks suppressed
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 3 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
buffer_io_error: 118 callbacks suppressed
Buffer I/O error on dev sr0, logical block 0, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 1, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 2, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 3, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 4, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 5, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 6, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 7, async page read
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 7142 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
should_fail_alloc_page+0xe0/0x110
prepare_alloc_pages+0x1af/0x500
__alloc_frozen_pages_noprof+0x17f/0x1f10
alloc_pages_mpol+0xed/0x340
vma_alloc_folio_noprof+0xe9/0x440
__handle_mm_fault+0x142c/0x30f0
handle_mm_fault+0x2c3/0x900
__get_user_pages+0x58a/0x2f10
populate_vma_page_range+0x282/0x410
__mm_populate+0x100/0x3a0
do_mlock+0x445/0x800
__x64_sys_mlock2+0xc1/0x100
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd7b566b19
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:00007fbd78adc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000145
RAX: ffffffffffffffda RBX: 00007fbd7b679f60 RCX: 00007fbd7b566b19
RDX: 0000000000000000 RSI: 000000000000a000 RDI: 0000000020ff6000
RBP: 00007fbd78adc1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd503a92bf R14: 00007fbd78adc300 R15: 0000000000022000
loop1: detected capacity change from 0 to 11
loop3: detected capacity change from 0 to 140
loop6: detected capacity change from 0 to 11
FAT-fs (loop1): error, corrupted directory (invalid entries)
FAT-fs (loop1): Filesystem has been set read-only
FAT-fs (loop1): error, corrupted directory (invalid entries)
FAT-fs (loop6): error, corrupted directory (invalid entries)
FAT-fs (loop6): Filesystem has been set read-only
EXT4-fs (loop3): warning: mounting unchecked fs, running e2fsck is recommended
FAT-fs (loop6): error, corrupted directory (invalid entries)
EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
EXT4-fs warning (device loop3): ext4_update_dynamic_rev:1125: updating to rev 1 because of new feature flag, running e2fsck is recommended
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 08 00
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 0, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 1, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 2, async page read
loop1: detected capacity change from 0 to 11
FAT-fs (loop1): error, corrupted directory (invalid entries)
FAT-fs (loop1): Filesystem has been set read-only
FAT-fs (loop1): error, corrupted directory (invalid entries)
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 3, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 4, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 5, async page read
loop6: detected capacity change from 0 to 11
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 6, async page read
FAT-fs (loop6): error, corrupted directory (invalid entries)
FAT-fs (loop6): Filesystem has been set read-only
FAT-fs (loop6): error, corrupted directory (invalid entries)
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev sr0, logical block 7, async page read
EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.
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 08 00
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
Buffer I/O error on dev sr0, logical block 0, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
Buffer I/O error on dev sr0, logical block 1, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
----------------
Code disassembly (best guess):
0: e8 e8 82 13 00 callq 0x1382ed
5: 31 f6 xor %esi,%esi
7: 48 89 ef mov %rbp,%rdi
a: e8 be d7 ff ff callq 0xffffd7cd
f: 4c 89 ef mov %r13,%rdi
12: e8 a6 68 52 03 callq 0x35268bd
17: 31 f6 xor %esi,%esi
19: 48 89 ef mov %rbp,%rdi
1c: e8 4c d9 ff ff callq 0xffffd96d
21: e8 27 81 13 00 callq 0x13814d
26: fb sti
27: 45 31 e4 xor %r12d,%r12d
* 2a: e9 ae fe ff ff jmpq 0xfffffedd <-- trapping instruction
2f: e8 09 57 0b 00 callq 0xb573d
34: 90 nop
35: 0f 0b ud2
37: 90 nop
38: e9 45 ff ff ff jmpq 0xffffff82
3d: 4c 89 f7 mov %r14,%rdi