R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd8a989dff R14: 00007f7136012300 R15: 0000000000022000
 </TASK>
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff8880173e2840 by task syz-executor.4/8008

CPU: 0 UID: 0 PID: 8008 Comm: syz-executor.4 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:
 <IRQ>
 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: 00000000000002ce RBX: 00000000ffffffff RCX: ffffffff817bc5c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880403877b8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 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
 </IRQ>
 <TASK>
 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:ffff888040387860 EFLAGS: 00000202
RAX: 00000000000002cb RBX: ffffffff85d01f60 RCX: ffffffff817bc5c6
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
 __kmalloc_node_track_caller_noprof+0xb8/0x490
 kmemdup_nul+0x3b/0xa0
 p9_client_create+0x602/0x11b0
 v9fs_session_init+0x1df/0x17a0
 v9fs_mount+0xbc/0x9e0
 legacy_get_tree+0x109/0x220
 vfs_get_tree+0x93/0x340
 path_mount+0x12b7/0x1fb0
 __x64_sys_mount+0x27b/0x300
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7138a9cb19
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:00007f7136012188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7138baff60 RCX: 00007f7138a9cb19
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f71360121d0 R08: 0000000020000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd8a989dff R14: 00007f7136012300 R15: 0000000000022000
 </TASK>

Allocated by task 287:
 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 8010:
 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
 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 ffff8880173e1ec0
 which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
 freed 2456-byte region [ffff8880173e1ec0, ffff8880173e2858)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x173e0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880123f0c81
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 dead000000000100 dead000000000122
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff8880123f0c81
head: 0100000000000040 ffff888008c4bc80 dead000000000100 dead000000000122
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff8880123f0c81
head: 0100000000000003 ffffea00005cf801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880173e2700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880173e2780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880173e2800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
                                           ^
 ffff8880173e2880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880173e2900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
9pnet_fd: Insufficient options for proto=fd
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8023 Comm: syz-executor.5 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:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 should_failslab+0xc2/0x120
 __kmalloc_node_track_caller_noprof+0xb8/0x490
 kstrdup+0x3e/0xc0
 parse_opts.part.0+0x8d/0x340
 p9_fd_create+0x9b/0x530
 p9_client_create+0x7eb/0x11b0
 v9fs_session_init+0x1df/0x17a0
 v9fs_mount+0xbc/0x9e0
 legacy_get_tree+0x109/0x220
 vfs_get_tree+0x93/0x340
 path_mount+0x12b7/0x1fb0
 __x64_sys_mount+0x27b/0x300
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f16676bcb19
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:00007f1664c11188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f16677d0020 RCX: 00007f16676bcb19
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f1664c111d0 R08: 0000000020000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc9b751f1f R14: 00007f1664c11300 R15: 0000000000022000
 </TASK>
9pnet_fd: Insufficient options for proto=fd
9pnet_fd: Insufficient options for proto=fd
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8035 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:
 <TASK>
 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: 0033:0x7fcb83b8a69c
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:00007fcb8112c170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00007fcb83b8a69c
RDX: 000000000000000f RSI: 00007fcb8112c1e0 RDI: 0000000000000006
RBP: 00007fcb8112c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe118d13ef R14: 00007fcb8112c300 R15: 0000000000022000
 </TASK>
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 8039 Comm: syz-executor.1 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:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 should_failslab+0xc2/0x120
 __kmalloc_node_track_caller_noprof+0xb8/0x490
 kmemdup_nul+0x3b/0xa0
 p9_client_create+0x602/0x11b0
 v9fs_session_init+0x1df/0x17a0
 v9fs_mount+0xbc/0x9e0
 legacy_get_tree+0x109/0x220
 vfs_get_tree+0x93/0x340
 path_mount+0x12b7/0x1fb0
 __x64_sys_mount+0x27b/0x300
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc450083b19
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:00007fc44d5f9188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc450196f60 RCX: 00007fc450083b19
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fc44d5f91d0 R08: 0000000020000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdb32c31df R14: 00007fc44d5f9300 R15: 0000000000022000
 </TASK>
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8046 Comm: syz-executor.4 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:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 should_failslab+0xc2/0x120
 __kmalloc_node_track_caller_noprof+0xb8/0x490
 kmemdup_nul+0x3b/0xa0
 p9_client_create+0x602/0x11b0
 v9fs_session_init+0x1df/0x17a0
 v9fs_mount+0xbc/0x9e0
 legacy_get_tree+0x109/0x220
 vfs_get_tree+0x93/0x340
 path_mount+0x12b7/0x1fb0
 __x64_sys_mount+0x27b/0x300
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7138a9cb19
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:00007f7135ff1188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7138bb0020 RCX: 00007f7138a9cb19
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f7135ff11d0 R08: 0000000020000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd8a989dff R14: 00007f7135ff1300 R15: 0000000000022000
 </TASK>
9pnet_fd: Insufficient options for proto=fd
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 8065 Comm: syz-executor.5 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:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 should_failslab+0xc2/0x120
 __kmalloc_cache_noprof+0x73/0x470
 p9_fd_create+0x17e/0x530
 p9_client_create+0x7eb/0x11b0
 v9fs_session_init+0x1df/0x17a0
 v9fs_mount+0xbc/0x9e0
 legacy_get_tree+0x109/0x220
 vfs_get_tree+0x93/0x340
 path_mount+0x12b7/0x1fb0
 __x64_sys_mount+0x27b/0x300
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f16676bcb19
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:00007f1664c32188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f16677cff60 RCX: 00007f16676bcb19
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f1664c321d0 R08: 0000000020000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc9b751f1f R14: 00007f1664c32300 R15: 0000000000022000
 </TASK>
9pnet_fd: Insufficient options for proto=fd
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 8062 Comm: syz-executor.4 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:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 should_failslab+0xc2/0x120
 __kmalloc_node_track_caller_noprof+0xb8/0x490
 kstrdup+0x3e/0xc0
 parse_opts.part.0+0x8d/0x340
 p9_fd_create+0x9b/0x530
 p9_client_create+0x7eb/0x11b0
 v9fs_session_init+0x1df/0x17a0
 v9fs_mount+0xbc/0x9e0
 legacy_get_tree+0x109/0x220
 vfs_get_tree+0x93/0x340
 path_mount+0x12b7/0x1fb0
 __x64_sys_mount+0x27b/0x300
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7138a9cb19
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:00007f7136012188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7138baff60 RCX: 00007f7138a9cb19
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f71360121d0 R08: 0000000020000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd8a989dff R14: 00007f7136012300 R15: 0000000000022000
 </TASK>
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 8088 Comm: syz-executor.1 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:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 should_failslab+0xc2/0x120
 __kmalloc_node_track_caller_noprof+0xb8/0x490
 kstrdup+0x3e/0xc0
 parse_opts.part.0+0x8d/0x340
 p9_fd_create+0x9b/0x530
 p9_client_create+0x7eb/0x11b0
 v9fs_session_init+0x1df/0x17a0
 v9fs_mount+0xbc/0x9e0
 legacy_get_tree+0x109/0x220
 vfs_get_tree+0x93/0x340
 path_mount+0x12b7/0x1fb0
 __x64_sys_mount+0x27b/0x300
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc450083b19
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:00007fc44d5f9188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc450196f60 RCX: 00007fc450083b19
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fc44d5f91d0 R08: 0000000020000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdb32c31df R14: 00007fc44d5f9300 R15: 0000000000022000
 </TASK>
9pnet_fd: Insufficient options for proto=fd
----------------
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