================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] BUG: KASAN: slab-use-after-free in l2tp_session_delete+0x28/0x9e0 net/l2tp/l2tp_core.c:1639 Write of size 8 at addr ffff8880220e3008 by task kworker/u8:4/62 CPU: 0 UID: 0 PID: 62 Comm: kworker/u8:4 Not tainted 6.10.0-rc6-next-20240703-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: l2tp l2tp_tunnel_del_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] l2tp_session_delete+0x28/0x9e0 net/l2tp/l2tp_core.c:1639 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1302 [inline] l2tp_tunnel_del_work+0x1cb/0x330 net/l2tp/l2tp_core.c:1334 process_one_work kernel/workqueue.c:3224 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305 worker_thread+0x86d/0xd40 kernel/workqueue.c:3383 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 13339: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:684 [inline] kzalloc_noprof include/linux/slab.h:806 [inline] l2tp_session_create+0x3b/0xc20 net/l2tp/l2tp_core.c:1675 pppol2tp_connect+0xca3/0x17a0 net/l2tp/l2tp_ppp.c:782 __sys_connect_file net/socket.c:2061 [inline] __sys_connect+0x2df/0x310 net/socket.c:2078 __do_sys_connect net/socket.c:2088 [inline] __se_sys_connect net/socket.c:2085 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2085 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 13338: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2231 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x149/0x360 mm/slub.c:4594 __sk_destruct+0x58/0x5f0 net/core/sock.c:2191 rcu_do_batch kernel/rcu/tree.c:2556 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2812 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3075 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3179 pppol2tp_release+0x24b/0x350 net/l2tp/l2tp_ppp.c:457 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:204 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880220e3000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 8 bytes inside of freed 1024-byte region [ffff8880220e3000, ffff8880220e3400) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x220e0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff888015041dc0 ffffea00018e8200 dead000000000002 raw: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888015041dc0 ffffea00018e8200 dead000000000002 head: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea0000883801 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 11, tgid 11 (kworker/u8:0), ts 9829060274, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2ccb/0x2d80 mm/page_alloc.c:3480 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4738 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2300 allocate_slab+0x5a/0x2f0 mm/slub.c:2463 new_slab mm/slub.c:2516 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3702 __slab_alloc+0x58/0xa0 mm/slub.c:3792 __slab_alloc_node mm/slub.c:3845 [inline] slab_alloc_node mm/slub.c:4025 [inline] __kmalloc_cache_node_noprof+0x20c/0x300 mm/slub.c:4197 kmalloc_node_noprof include/linux/slab.h:703 [inline] blk_mq_alloc_hctx block/blk-mq.c:3749 [inline] blk_mq_alloc_and_init_hctx+0x185/0xdc0 block/blk-mq.c:4246 blk_mq_realloc_hw_ctxs+0x198/0x4a0 block/blk-mq.c:4279 blk_mq_init_allocated_queue+0x3d1/0x14f0 block/blk-mq.c:4321 blk_mq_alloc_queue+0x1d9/0x2f0 block/blk-mq.c:4155 scsi_alloc_sdev+0x772/0xb90 drivers/scsi/scsi_scan.c:337 scsi_probe_and_add_lun+0x1db/0x4be0 drivers/scsi/scsi_scan.c:1210 __scsi_scan_target+0x205/0x1080 drivers/scsi/scsi_scan.c:1757 scsi_scan_channel drivers/scsi/scsi_scan.c:1845 [inline] scsi_scan_host_selected+0x37e/0x690 drivers/scsi/scsi_scan.c:1874 page_owner free stack trace missing Memory state around the buggy address: ffff8880220e2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880220e2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880220e3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880220e3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880220e3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================