R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020005130 R15: 0000000000000002
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88801576bcc0 by task syz-executor.7/7765
CPU: 0 UID: 0 PID: 7765 Comm: syz-executor.7 Not tainted 6.16.0-rc4-next-20250630 #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 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:ffff88806ce08f78 EFLAGS: 00000206
RAX: 000000000000013a RBX: 00000000ffffffff RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880184571d8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000380 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 40 7b fc e8 e1 f7 a4 fc 48 89 ee 31 ff e8 d7 95 c4 fc e8 72 9a c4 fc e8 7d c4 cc fc fb 5b <5d> 41 5c e9 63 9a c4 fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff888018457280 EFLAGS: 00000202
RAX: 0000000000000137 RBX: ffffffff85d01e20 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84aefc13
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: ffffffff8530f500
R13: ffffffff85d01e30 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x5f/0x470
__kernfs_new_node+0xd3/0x870
kernfs_new_node+0x13c/0x1e0
__kernfs_create_file+0x55/0x360
sysfs_add_file_mode_ns+0x21c/0x440
internal_create_group+0x571/0xeb0
loop_configure+0xc64/0x16f0
lo_ioctl+0x1066/0x2780
blkdev_ioctl+0x27c/0x6c0
__x64_sys_ioctl+0x18f/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47b4a088d7
Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 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:00007f47b1f7df48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f47b4a52970 RCX: 00007f47b4a088d7
RDX: 0000000000000004 RSI: 0000000000004c00 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020005130 R15: 0000000000000002
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 7748:
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+0xf76/0x18a0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88801576b340
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88801576b340, ffff88801576bcd8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15768
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88801eb56181
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea00005cf400 dead000000000004
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801eb56181
head: 0100000000000040 ffff888008c4bc80 ffffea00005cf400 dead000000000004
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801eb56181
head: 0100000000000003 ffffea000055da01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801576bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801576bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801576bc80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff88801576bd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801576bd80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
FAT-fs (loop2): invalid media value (0x00)
FAT-fs (loop2): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop2): Can't find a valid FAT filesystem
Bluetooth: hci3: ACL packet for unknown connection handle 200
loop7: detected capacity change from 0 to 16383
FAT-fs (loop7): invalid media value (0x00)
FAT-fs (loop7): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop7): Can't find a valid FAT filesystem
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 7782 Comm: syz-executor.7 Tainted: G B 6.16.0-rc4-next-20250630 #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
__kernfs_new_node+0xd3/0x870
kernfs_new_node+0x13c/0x1e0
__kernfs_create_file+0x55/0x360
sysfs_add_file_mode_ns+0x21c/0x440
internal_create_group+0x571/0xeb0
loop_configure+0xc64/0x16f0
lo_ioctl+0x1066/0x2780
blkdev_ioctl+0x27c/0x6c0
__x64_sys_ioctl+0x18f/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47b4a088d7
Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 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:00007f47b1f7df48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f47b4a52970 RCX: 00007f47b4a088d7
RDX: 0000000000000004 RSI: 0000000000004c00 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020005130 R15: 0000000000000002
Bluetooth: hci3: ACL packet for unknown connection handle 200
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
Bluetooth: hci3: ACL packet for unknown connection handle 200
CPU: 0 UID: 0 PID: 7791 Comm: syz-executor.2 Tainted: G B 6.16.0-rc4-next-20250630 #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
__kernfs_new_node+0xd3/0x870
kernfs_new_node+0x13c/0x1e0
__kernfs_create_file+0x55/0x360
sysfs_add_file_mode_ns+0x21c/0x440
internal_create_group+0x571/0xeb0
loop_configure+0xc64/0x16f0
lo_ioctl+0x1066/0x2780
blkdev_ioctl+0x27c/0x6c0
__x64_sys_ioctl+0x18f/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbaf1b6d8d7
Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 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:00007fbaef0e2f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbaf1bb7970 RCX: 00007fbaf1b6d8d7
RDX: 0000000000000004 RSI: 0000000000004c00 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020005130 R15: 0000000000000002
loop7: detected capacity change from 0 to 16383
Bluetooth: hci3: ACL packet for unknown connection handle 200
FAT-fs (loop7): invalid media value (0x00)
FAT-fs (loop7): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop7): Can't find a valid FAT filesystem
loop2: detected capacity change from 0 to 16383
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 7795 Comm: syz-executor.5 Tainted: G B 6.16.0-rc4-next-20250630 #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
security_file_alloc+0x35/0x130
init_file+0x95/0x4c0
alloc_empty_file+0x76/0x1e0
dentry_open+0x49/0xd0
vfs_open_tree+0x741/0x920
__x64_sys_open_tree+0x85/0x140
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d6476db19
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:00007f4d61ce3188 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac
RAX: ffffffffffffffda RBX: 00007f4d64880f60 RCX: 00007f4d6476db19
RDX: 0000000000089901 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f4d61ce31d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe1eaaf3ef R14: 00007f4d61ce3300 R15: 0000000000022000
FAT-fs (loop2): invalid media value (0x00)
FAT-fs (loop2): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop2): Can't find a valid FAT filesystem
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 7802 Comm: syz-executor.5 Tainted: G B 6.16.0-rc4-next-20250630 #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
security_file_alloc+0x35/0x130
init_file+0x95/0x4c0
alloc_empty_file+0x76/0x1e0
dentry_open+0x49/0xd0
vfs_open_tree+0x741/0x920
__x64_sys_open_tree+0x85/0x140
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d6476db19
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:00007f4d61ce3188 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac
RAX: ffffffffffffffda RBX: 00007f4d64880f60 RCX: 00007f4d6476db19
RDX: 0000000000089901 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f4d61ce31d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe1eaaf3ef R14: 00007f4d61ce3300 R15: 0000000000022000
loop7: detected capacity change from 0 to 16383
Bluetooth: hci3: ACL packet for unknown connection handle 200
Bluetooth: hci3: ACL packet for unknown connection handle 200
Bluetooth: hci3: ACL packet for unknown connection handle 200
FAT-fs (loop7): invalid media value (0x00)
FAT-fs (loop7): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop7): Can't find a valid FAT filesystem
loop2: detected capacity change from 0 to 16383
FAT-fs (loop2): invalid media value (0x00)
FAT-fs (loop2): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop2): Can't find a valid FAT filesystem
loop7: detected capacity change from 0 to 16383
FAT-fs (loop7): invalid media value (0x00)
FAT-fs (loop7): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop7): Can't find a valid FAT filesystem
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 7819 Comm: syz-executor.7 Tainted: G B 6.16.0-rc4-next-20250630 #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
__kernfs_new_node+0xd3/0x870
kernfs_new_node+0x13c/0x1e0
__kernfs_create_file+0x55/0x360
sysfs_add_file_mode_ns+0x21c/0x440
internal_create_group+0x571/0xeb0
loop_configure+0xc64/0x16f0
lo_ioctl+0x1066/0x2780
blkdev_ioctl+0x27c/0x6c0
__x64_sys_ioctl+0x18f/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47b4a088d7
Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 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:00007f47b1f7df48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f47b4a52970 RCX: 00007f47b4a088d7
RDX: 0000000000000004 RSI: 0000000000004c00 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000020005130 R15: 0000000000000002
loop7: detected capacity change from 0 to 16383
FAT-fs (loop7): invalid media value (0x00)
FAT-fs (loop7): This doesn't look like a DOS 1.x volume; no bootstrapping code
FAT-fs (loop7): Can't find a valid FAT filesystem
Bluetooth: hci3: ACL packet for unknown connection handle 200
Bluetooth: hci3: ACL packet for unknown connection handle 200
Bluetooth: hci3: ACL packet for unknown connection handle 200
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 7828 Comm: syz-executor.5 Tainted: G B 6.16.0-rc4-next-20250630 #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: 0033:0x7f4d6472069c
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:00007f4d61ce3170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f4d6472069c
RDX: 000000000000000f RSI: 00007f4d61ce31e0 RDI: 0000000000000003
RBP: 00007f4d61ce31d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe1eaaf3ef R14: 00007f4d61ce3300 R15: 0000000000022000
----------------
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