R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd62e4ca4f R14: 00007f7275384300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88803e1a4700 by task syz-executor.1/4727
CPU: 1 UID: 0 PID: 4727 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: 00000000002050f4 RBX: 00000000ffffffff RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff88803ebcf2d8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 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:__orc_find+0x8f/0xf0
Code: d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 50 48 63 03 48 01 d8 48 39 c1 73 b0 4c 8d 63 fc <4c> 39 e5 76 b3 4d 29 ee 49 c1 fe 02 4b 8d 04 76 48 8d 04 46 48 83
RSP: 0018:ffff88803ebcf380 EFLAGS: 00000287
RAX: ffffffff810001cc RBX: ffffffff86477a18 RCX: ffffffff8100012f
RDX: 0000000000000000 RSI: ffffffff867b44fa RDI: ffffffff864779d8
RBP: ffffffff864779d8 R08: ffffffff867b44fa R09: 0000000000000000
R10: 000000000003bae4 R11: 0000000000000003 R12: ffffffff86477a14
R13: ffffffff864779d8 R14: ffffffff864779d8 R15: dffffc0000000000
unwind_next_frame+0x2f9/0x2540
arch_stack_walk+0x86/0xf0
stack_trace_save+0x8e/0xc0
set_track_prepare+0x35/0x70
__alloc_object+0xf4/0x2d0
__create_object+0x1d/0x80
kmem_cache_alloc_noprof+0x399/0x470
__es_insert_extent+0xed2/0x1370
ext4_es_insert_extent+0x4d0/0x1100
ext4_map_blocks+0x815/0x15a0
ext4_getblk+0x682/0x8e0
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: 0033:0x7fc90b317c27
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:00007ffd303740b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffd30374140 RCX: 00007fc90b317c27
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffd30374140
RBP: 00007ffd3037411c R08: 0000000000000000 R09: 0000000000000005
R10: 00007ffd30373e55 R11: 0000000000000206 R12: 0000000000000032
R13: 00000000001c22e2 R14: 0000000000000003 R15: 00007ffd30374180
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 14076:
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 ffff88803e1a3d80
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88803e1a3d80, ffff88803e1a4718)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3e1a0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88801eb6ba01
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea0000f61200 dead000000000003
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801eb6ba01
head: 0100000000000040 ffff888008c4bc80 ffffea0000f61200 dead000000000003
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801eb6ba01
head: 0100000000000003 ffffea0000f86801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88803e1a4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803e1a4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803e1a4700: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88803e1a4780: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff88803e1a4800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 17 op 0x0:(READ) flags 0x0 phys_seg 7 prio class 0
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 14089 Comm: syz-executor.3 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
do_sys_poll+0x1b3/0xd90
__x64_sys_ppoll+0x229/0x2a0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7277e0eb19
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:00007f7275384188 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00007f7277f21f60 RCX: 00007f7277e0eb19
RDX: 0000000020000100 RSI: 0000000000000001 RDI: 00000000200000c0
RBP: 00007f72753841d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd62e4ca4f R14: 00007f7275384300 R15: 0000000000022000
9pnet_fd: Insufficient options for proto=fd
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 04 00 00 02 00
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 8 prio class 0
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 04 00 00 02 00
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 8 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 17 op 0x0:(READ) flags 0x0 phys_seg 7 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
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
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
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
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
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
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
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
9pnet_fd: Insufficient options for proto=fd
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_print_req_error: 39 callbacks suppressed
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
buffer_io_error: 78 callbacks suppressed
Buffer I/O error on dev sr0, logical block 16, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 17 op 0x0:(READ) flags 0x0 phys_seg 7 prio class 0
Buffer I/O error on dev sr0, logical block 17, async page read
Buffer I/O error on dev sr0, logical block 18, async page read
Buffer I/O error on dev sr0, logical block 19, async page read
Buffer I/O error on dev sr0, logical block 20, async page read
Buffer I/O error on dev sr0, logical block 21, async page read
Buffer I/O error on dev sr0, logical block 22, async page read
Buffer I/O error on dev sr0, logical block 23, async page read
program syz-executor.4 is using a deprecated SCSI ioctl, please convert it to SG_IO
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 04 00 00 02 00
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 8 prio class 0
Buffer I/O error on dev sr0, logical block 16, async page read
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
Buffer I/O error on dev sr0, logical block 17, async page read
CPU: 1 UID: 0 PID: 14126 Comm: syz-executor.3 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
put_timespec64+0xb5/0x130
poll_select_finish+0x4a6/0x5b0
__x64_sys_ppoll+0x23d/0x2a0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7277e0eb19
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:00007f7275384188 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00007f7277f21f60 RCX: 00007f7277e0eb19
RDX: 0000000020000100 RSI: 0000000000000001 RDI: 00000000200000c0
RBP: 00007f72753841d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd62e4ca4f R14: 00007f7275384300 R15: 0000000000022000
9pnet_fd: Insufficient options for proto=fd
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 04 00 00 02 00
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 8 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 16 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 17 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
9pnet_fd: Insufficient options for proto=fd
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 18 op 0x0:(READ) flags 0x0 phys_seg 6 prio class 0
----------------
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