R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffcbc8ab65f R14: 00007f4b2dbd0300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888015393280 by task syz-executor.1/5421
CPU: 1 UID: 0 PID: 5421 Comm: syz-executor.1 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: 0000000000000158 RBX: 00000000ffffffff RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff888015557498 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000382 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:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 e6 50 7b fc e8 d1 07 a5 fc 48 89 ee 31 ff e8 d7 a5 c4 fc e8 72 aa c4 fc e8 7d d4 cc fc fb 5b <5d> 41 5c e9 63 aa c4 fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff888015557540 EFLAGS: 00000206
RAX: 0000000000000155 RBX: ffffffff85d01f20 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84aeec13
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: ffffffff8530f500
R13: ffffffff85d01f30 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x5f/0x470
jbd2__journal_start+0x193/0x6b0
__ext4_journal_start_sb+0x325/0x5d0
__ext4_new_inode+0x2c38/0x4b90
ext4_create+0x2e2/0x4e0
lookup_open.isra.0+0x10f8/0x1530
path_openat+0xc26/0x2880
do_filp_open+0x1e8/0x450
do_sys_openat2+0x104/0x1b0
__x64_sys_creat+0xcc/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b3065ab19
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:00007f4b2dbd0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f4b3076df60 RCX: 00007f4b3065ab19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200003c0
RBP: 00007f4b2dbd01d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffcbc8ab65f R14: 00007f4b2dbd0300 R15: 0000000000022000
Allocated by task 287:
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 5423:
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 ffff888015392900
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888015392900, ffff888015393298)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15390
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800c1b1b01
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800c1b1b01
head: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800c1b1b01
head: 0100000000000003 ffffea000054e401 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888015393180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888015393200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888015393280: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888015393300: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff888015393380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs error (device sda) in __ext4_new_inode:1086: Out of memory
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 5434 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
should_failslab+0xc2/0x120
__kmalloc_cache_noprof+0x73/0x4a0
mon_bin_open+0x1aa/0x4a0
chrdev_open+0x234/0x690
do_dentry_open+0x71c/0x1420
vfs_open+0x82/0x3f0
path_openat+0x1c3f/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: 0033:0x7f1c7119aa04
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:00007f1c6e75ccc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f1c7119aa04
RDX: 0000000000000000 RSI: 00007f1c6e75cd60 RDI: 00000000ffffff9c
RBP: 00007f1c6e75cd60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fffb72ca93f R14: 00007f1c6e75d300 R15: 0000000000022000
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs warning (device loop4): ext4_multi_mount_protect:332: MMP startup interrupted, failing mount
loop5: detected capacity change from 0 to 512
loop4: detected capacity change from 0 to 2048
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 5470 Comm: syz-executor.1 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
__kmalloc_noprof+0xb4/0x4c0
security_inode_init_security+0x13d/0x390
__ext4_new_inode+0x3378/0x4b90
ext4_create+0x2e2/0x4e0
lookup_open.isra.0+0x10f8/0x1530
path_openat+0xc26/0x2880
do_filp_open+0x1e8/0x450
do_sys_openat2+0x104/0x1b0
__x64_sys_creat+0xcc/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b3065ab19
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:00007f4b2dbd0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f4b3076df60 RCX: 00007f4b3065ab19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200003c0
RBP: 00007f4b2dbd01d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffcbc8ab65f R14: 00007f4b2dbd0300 R15: 0000000000022000
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5479 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
should_fail_alloc_page+0xe0/0x110
prepare_alloc_pages+0x1af/0x500
__alloc_frozen_pages_noprof+0x17f/0x1f10
alloc_pages_mpol+0xed/0x340
alloc_pages_noprof+0xa1/0x380
get_zeroed_page_noprof+0x18/0xb0
mon_alloc_buff+0xed/0x250
mon_bin_open+0x209/0x4a0
chrdev_open+0x234/0x690
do_dentry_open+0x71c/0x1420
vfs_open+0x82/0x3f0
path_openat+0x1c3f/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: 0033:0x7f1c7119aa04
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:00007f1c6e75ccc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f1c7119aa04
RDX: 0000000000000000 RSI: 00007f1c6e75cd60 RDI: 00000000ffffff9c
RBP: 00007f1c6e75cd60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fffb72ca93f R14: 00007f1c6e75d300 R15: 0000000000022000
loop5: detected capacity change from 0 to 512
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.
EXT4-fs warning (device loop4): ext4_multi_mount_protect:332: MMP startup interrupted, failing mount
----------------
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