R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000240
R13: 0000000020000280 R14: 00007fc383b04000 R15: 0000000020000400
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88803e27c700 by task syz-executor.2/8223
CPU: 1 UID: 0 PID: 8223 Comm: syz-executor.2 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: 0000000000000198 RBX: 00000000ffffffff RCX: 0000000000000008
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff888017a5f858 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000280 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:ffff888017a5f900 EFLAGS: 00000206
RAX: 0000000000000195 RBX: ffffffff85d01f20 RCX: 0000000000000080
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_add_journal_head+0x367/0x5d0
jbd2_journal_get_create_access+0x44/0x560
__ext4_journal_get_create_access+0x54/0x1b0
ext4_getblk+0x3c9/0x8e0
ext4_bread+0x2e/0x1a0
ext4_append+0x224/0x530
ext4_init_new_dir+0x21e/0x460
ext4_mkdir+0x3c5/0xb30
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: 0033:0x7fc38658dc27
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:00007fc383b03fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc38658dc27
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000280
RBP: 00007fc383b04040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000240
R13: 0000000020000280 R14: 00007fc383b04000 R15: 0000000020000400
Allocated by task 286:
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 8224:
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 ffff88803e27bd80
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88803e27bd80, ffff88803e27c718)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88803e279ec0 pfn:0x3e278
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800ecee101
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea00006d2000 dead000000000002
raw: ffff88803e279ec0 00000000800c000b 00000000f5000000 ffff88800ecee101
head: 0100000000000040 ffff888008c4bc80 ffffea00006d2000 dead000000000002
head: ffff88803e279ec0 00000000800c000b 00000000f5000000 ffff88800ecee101
head: 0100000000000003 ffffea0000f89e01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88803e27c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803e27c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803e27c700: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88803e27c780: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff88803e27c800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
ENOMEM in journal_alloc_journal_head, retrying.
loop1: detected capacity change from 0 to 264192
ISOFS: Unable to identify CD-ROM format.
No source specified
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 8231 Comm: syz-executor.5 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
_copy_to_user+0x32/0xd0
simple_read_from_buffer+0xe0/0x180
proc_fail_nth_read+0x189/0x270
vfs_read+0x1eb/0xbe0
ksys_read+0x121/0x240
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f22de46769c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48
RSP: 002b:00007f22dba2a170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007f22de46769c
RDX: 000000000000000f RSI: 00007f22dba2a1e0 RDI: 0000000000000004
RBP: 00007f22dba2a1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd636cfe9f R14: 00007f22dba2a300 R15: 0000000000022000
loop1: detected capacity change from 0 to 264192
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8237 Comm: syz-executor.4 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
_copy_from_user+0x30/0xd0
copy_msghdr_from_user+0x88/0x150
___sys_sendmsg+0xdc/0x1b0
__sys_sendmsg+0x150/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe009a93b19
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:00007fe007009188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe009ba6f60 RCX: 00007fe009a93b19
RDX: 0000000000000000 RSI: 0000000020002040 RDI: 0000000000000003
RBP: 00007fe0070091d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc4d95dfef R14: 00007fe007009300 R15: 0000000000022000
ISOFS: Unable to identify CD-ROM format.
No source specified
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8265 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
jbd2__journal_start+0x193/0x6b0
__ext4_journal_start_sb+0x325/0x5d0
ext4_do_writepages+0x11fe/0x3230
ext4_writepages+0x369/0x7a0
do_writepages+0x244/0x5c0
filemap_fdatawrite_wbc+0x10b/0x150
__filemap_fdatawrite_range+0xb9/0x100
filemap_write_and_wait_range+0xa5/0x130
ext4_file_write_iter+0x1066/0x1990
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: 0033:0x7f4c7cadeb19
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:00007f4c7a054188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f4c7cbf1f60 RCX: 00007f4c7cadeb19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007f4c7a0541d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008002 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe60c9573f R14: 00007f4c7a054300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
EXT4-fs (sda): ext4_do_writepages: jbd2_start: 9223372036854775807 pages, ino 16000; err -12
CPU: 1 UID: 0 PID: 8267 Comm: syz-executor.4 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_node_noprof+0x71/0x470
__alloc_skb+0x2ab/0x370
netlink_alloc_large_skb+0x69/0x150
netlink_sendmsg+0x676/0xd80
____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: 0033:0x7fe009a93b19
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:00007fe007009188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe009ba6f60 RCX: 00007fe009a93b19
RDX: 0000000000000000 RSI: 0000000020002040 RDI: 0000000000000003
RBP: 00007fe0070091d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc4d95dfef R14: 00007fe007009300 R15: 0000000000022000
loop1: detected capacity change from 0 to 264192
ISOFS: Unable to identify CD-ROM format.
No source specified
loop1: detected capacity change from 0 to 264192
ISOFS: Unable to identify CD-ROM format.
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8297 Comm: syz-executor.2 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
_copy_from_user+0x30/0xd0
memdup_user+0x7e/0xe0
strndup_user+0x78/0xe0
__x64_sys_mount+0x136/0x300
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc38659004a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 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:00007fc383b03fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc38659004a
RDX: 0000000020000240 RSI: 0000000020000280 RDI: 0000000000000000
RBP: 00007fc383b04040 R08: 00007fc383b04040 R09: 0000000020000240
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000240
R13: 0000000020000280 R14: 00007fc383b04000 R15: 0000000020000400
----------------
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