R10: 0000000000008002 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd0f4c0c5f R14: 00007fc143f4f300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88801aa513c0 by task syz-executor.0/6847
CPU: 0 UID: 0 PID: 6847 Comm: syz-executor.0 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+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 b4 47 06 00 00 e8 42 6b 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: 00000000000004fe RBX: 00000000ffffffff RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff88803d93efe8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000282 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 26 31 7b fc e8 e1 e7 a4 fc 48 89 ee 31 ff e8 f7 8b c4 fc e8 92 90 c4 fc e8 9d ba cc fc fb 5b <5d> 41 5c e9 83 90 c4 fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff88803d93f090 EFLAGS: 00000202
RAX: 00000000000004fb RBX: ffffffff85d01f60 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84af0c13
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: ffffffff8530fc40
R13: ffffffff85d01f70 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x5f/0x470
__es_insert_extent+0xed2/0x1370
ext4_es_insert_delayed_extent+0x383/0x890
ext4_da_get_block_prep+0x8f6/0x1050
ext4_block_write_begin+0x4d5/0xc50
ext4_da_write_begin+0x47d/0xaa0
generic_perform_write+0x3a4/0x820
ext4_buffered_write_iter+0x11a/0x430
ext4_file_write_iter+0x9df/0x1990
iter_file_splice_write+0x927/0x10c0
direct_splice_actor+0x192/0x7b0
splice_direct_to_actor+0x347/0x9d0
do_splice_direct+0x179/0x250
do_sendfile+0xa8e/0xdc0
__x64_sys_sendfile64+0x1d3/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc1469d9b19
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:00007fc143f4f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fc146aecf60 RCX: 00007fc1469d9b19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fc143f4f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008002 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd0f4c0c5f R14: 00007fc143f4f300 R15: 0000000000022000
Allocated by task 284:
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 6828:
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+0x18b4/0x18c0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88801aa50a40
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88801aa50a40, ffff88801aa513d8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1aa50
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800e518e01
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800e518e01
head: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800e518e01
head: 0100000000000003 ffffea00006a9401 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801aa51280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801aa51300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801aa51380: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff88801aa51400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801aa51480: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
loop7: detected capacity change from 0 to 512
EXT4-fs (loop7): unsupported inode size: 0
EXT4-fs (loop7): blocksize: 2048
loop1: detected capacity change from 0 to 3
loop7: detected capacity change from 0 to 512
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
EXT4-fs (loop7): unsupported inode size: 0
EXT4-fs (loop7): blocksize: 2048
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 6865 Comm: syz-executor.6 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_cache_noprof+0x73/0x470
cgroup_show_path+0xb2/0x760
kernfs_sop_show_path+0xe5/0x140
show_path+0x99/0x100
show_mountinfo+0x1c7/0x800
seq_read_iter+0xbe7/0x1310
vfs_read+0x868/0xbe0
__x64_sys_pread64+0x1f1/0x260
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8406d5b19
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:00007fe83dc4b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007fe8407e8f60 RCX: 00007fe8406d5b19
RDX: 000000000000fdef RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007fe83dc4b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd4ceaecaf R14: 00007fe83dc4b300 R15: 0000000000022000
loop7: detected capacity change from 0 to 512
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 6883 Comm: syz-executor.6 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_cache_noprof+0x73/0x470
cgroup_show_path+0xb2/0x760
kernfs_sop_show_path+0xe5/0x140
show_path+0x99/0x100
show_mountinfo+0x1c7/0x800
seq_read_iter+0xbe7/0x1310
vfs_read+0x868/0xbe0
__x64_sys_pread64+0x1f1/0x260
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8406d5b19
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:00007fe83dc4b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007fe8407e8f60 RCX: 00007fe8406d5b19
RDX: 000000000000fdef RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007fe83dc4b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd4ceaecaf R14: 00007fe83dc4b300 R15: 0000000000022000
EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000.
loop1: detected capacity change from 0 to 3
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop7: detected capacity change from 0 to 512
EXT4-fs (loop7): unsupported inode size: 0
EXT4-fs (loop7): blocksize: 2048
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 6905 Comm: syz-executor.0 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
jbd2__journal_start+0x193/0x6b0
__ext4_journal_start_sb+0x325/0x5d0
ext4_dirty_inode+0xa5/0x130
__mark_inode_dirty+0x1b7/0xd00
generic_update_time+0xcb/0xf0
touch_atime+0x4bd/0x590
filemap_splice_read+0x9b7/0xc80
ext4_file_splice_read+0xfd/0x150
do_splice_read+0x1f8/0x2a0
splice_direct_to_actor+0x2a8/0x9d0
do_splice_direct+0x179/0x250
do_sendfile+0xa8e/0xdc0
__x64_sys_sendfile64+0x1d3/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc1469d9b19
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:00007fc143f4f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fc146aecf60 RCX: 00007fc1469d9b19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fc143f4f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008002 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd0f4c0c5f R14: 00007fc143f4f300 R15: 0000000000022000
loop7: detected capacity change from 0 to 512
EXT4-fs (loop7): unsupported inode size: 0
EXT4-fs (loop7): blocksize: 2048
loop1: detected capacity change from 0 to 3
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop7: detected capacity change from 0 to 512
EXT4-fs (loop7): unsupported inode size: 0
EXT4-fs (loop7): blocksize: 2048
loop1: detected capacity change from 0 to 3
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
----------------
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 b4 47 movw $0x0,%gs:0x647b4cf(%rip) # 0x647b4ee
1c: 06 00 00
1f: e8 42 6b 40 00 callq 0x406b66
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