================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] BUG: KASAN: use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:173 [inline] BUG: KASAN: use-after-free in mutex_lock+0x7f/0xe0 kernel/locking/mutex.c:298 Write of size 8 at addr ffff88811930b440 by task syz.0.1526/6540 CPU: 0 PID: 6540 Comm: syz.0.1526 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] __mutex_trylock_fast kernel/locking/mutex.c:173 [inline] mutex_lock+0x7f/0xe0 kernel/locking/mutex.c:298 steam_input_open+0x91/0x160 drivers/hid/hid-steam.c:297 input_open_device+0x14c/0x2a0 drivers/input/input.c:635 evdev_open_device drivers/input/evdev.c:400 [inline] evdev_open+0x4d2/0x5e0 drivers/input/evdev.c:487 chrdev_open+0x597/0x670 fs/char_dev.c:414 do_dentry_open+0x793/0x1090 fs/open.c:819 vfs_open+0x73/0x80 fs/open.c:942 do_open fs/namei.c:3391 [inline] path_openat+0x27ad/0x3160 fs/namei.c:3509 do_filp_open+0x1b3/0x3e0 fs/namei.c:3536 do_sys_openat2+0x14c/0x6d0 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1244 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fadd8faf590 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007fadd79f7b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fadd8faf590 RDX: 0000000000000000 RSI: 00007fadd79f7c10 RDI: 00000000ffffff9c RBP: 00007fadd79f7c10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd R13: 00007fadd91f8128 R14: 00007fadd91f8090 R15: 00007ffdf5ec7688 Allocated by task 0: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a7/0x330 mm/slub.c:4038 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] neigh_alloc net/core/neighbour.c:439 [inline] ___neigh_create+0x6f0/0x1a20 net/core/neighbour.c:592 __neigh_create+0x31/0x40 net/core/neighbour.c:680 ip6_finish_output2+0x8d1/0x1500 net/ipv6/ip6_output.c:127 __ip6_finish_output+0x5ff/0x790 net/ipv6/ip6_output.c:201 ip6_finish_output+0x33/0x1f0 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:288 [inline] ip6_output+0x1d1/0x3b0 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:451 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ndisc_send_skb+0x6f5/0xb40 net/ipv6/ndisc.c:513 ndisc_send_rs+0x6e5/0x960 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x2c7/0x600 net/ipv6/addrconf.c:3968 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450 expire_timers kernel/time/timer.c:1495 [inline] __run_timers+0x639/0x9a0 kernel/time/timer.c:1789 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1802 __do_softirq+0x255/0x563 kernel/softirq.c:309 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 kvfree_call_rcu+0x10c/0x620 kernel/rcu/tree.c:3539 neigh_destroy+0x445/0x570 net/core/neighbour.c:865 neigh_release include/net/neighbour.h:427 [inline] neigh_cleanup_and_release+0x76/0x1a0 net/core/neighbour.c:104 neigh_del net/core/neighbour.c:198 [inline] neigh_remove_one+0x341/0x3b0 net/core/neighbour.c:219 neigh_forced_gc net/core/neighbour.c:252 [inline] neigh_alloc net/core/neighbour.c:430 [inline] ___neigh_create+0x48b/0x1a20 net/core/neighbour.c:592 __neigh_create+0x31/0x40 net/core/neighbour.c:680 ip6_finish_output2+0x8d1/0x1500 net/ipv6/ip6_output.c:127 __ip6_finish_output+0x5ff/0x790 net/ipv6/ip6_output.c:201 ip6_finish_output+0x33/0x1f0 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:288 [inline] ip6_output+0x1d1/0x3b0 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:451 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ndisc_send_skb+0x6f5/0xb40 net/ipv6/ndisc.c:513 ndisc_send_ns+0x842/0xaf0 net/ipv6/ndisc.c:655 addrconf_dad_work+0x9de/0x1410 net/ipv6/addrconf.c:4210 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff88811930b400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 64 bytes inside of 512-byte region [ffff88811930b400, ffff88811930b600) The buggy address belongs to the page: page:ffffea000464c200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811930b400 pfn:0x119308 head:ffffea000464c200 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea0004927408 ffffea00042bbb08 ffff888100043080 raw: ffff88811930b400 0000000000100005 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 592, ts 35544984300, free_ts 35543848723 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc_trace+0x1b3/0x2e0 mm/slub.c:2977 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] ipv6_add_addr+0x3d6/0xd40 net/ipv6/addrconf.c:1114 inet6_addr_add+0x44c/0x950 net/ipv6/addrconf.c:3017 inet6_rtm_newaddr+0x684/0x930 net/ipv6/addrconf.c:4961 rtnetlink_rcv_msg+0x9db/0xb90 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] __sys_sendto+0x41d/0x580 net/socket.c:2006 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x7fc/0x820 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5431 [inline] __free_pages+0xdd/0x380 mm/page_alloc.c:5440 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab mm/slub.c:1920 [inline] unfreeze_partials+0x15f/0x190 mm/slub.c:2415 put_cpu_partial+0xc1/0x180 mm/slub.c:2451 __slab_free+0x2c9/0x3a0 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x111/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2965 sock_alloc_inode+0x1b/0xb0 net/socket.c:253 alloc_inode fs/inode.c:233 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:968 sock_alloc net/socket.c:574 [inline] __sock_create+0x12c/0x770 net/socket.c:1400 Memory state around the buggy address: ffff88811930b300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811930b380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811930b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811930b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811930b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== general protection fault, probably for non-canonical address 0xdffffc0000000213: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000000001098-0x000000000000109f] CPU: 1 PID: 6540 Comm: syz.0.1526 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 RIP: 0010:steam_send_report+0x66/0x310 drivers/hid/hid-steam.c:172 Code: 80 3c 18 00 74 12 4c 89 f7 e8 c6 34 3f fe 48 ba 00 00 00 00 00 fc ff df 4d 8b 26 49 8d 9c 24 98 10 00 00 48 89 d8 48 c1 e8 03 <80> 3c 10 00 74 12 48 89 df e8 9c 34 3f fe 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900029d7668 EFLAGS: 00010202 RAX: 0000000000000213 RBX: 0000000000001098 RCX: 0000000000000282 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88811930b430 RBP: ffffc900029d76b0 R08: dffffc0000000000 R09: fffff5200053aec9 R10: fffff5200053aec9 R11: 1ffff9200053aec8 R12: 0000000000000000 R13: 1ffff9200053aed8 R14: ffff88811930b430 R15: ffffc900029d76e0 FS: 00007fadd79f86c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555570ba04e8 CR3: 0000000120d69000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: steam_send_report_byte drivers/hid/hid-steam.c:212 [inline] steam_set_lizard_mode drivers/hid/hid-steam.c:285 [inline] steam_input_open+0xde/0x160 drivers/hid/hid-steam.c:299 input_open_device+0x14c/0x2a0 drivers/input/input.c:635 evdev_open_device drivers/input/evdev.c:400 [inline] evdev_open+0x4d2/0x5e0 drivers/input/evdev.c:487 chrdev_open+0x597/0x670 fs/char_dev.c:414 do_dentry_open+0x793/0x1090 fs/open.c:819 vfs_open+0x73/0x80 fs/open.c:942 do_open fs/namei.c:3391 [inline] path_openat+0x27ad/0x3160 fs/namei.c:3509 do_filp_open+0x1b3/0x3e0 fs/namei.c:3536 do_sys_openat2+0x14c/0x6d0 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1244 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fadd8faf590 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007fadd79f7b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fadd8faf590 RDX: 0000000000000000 RSI: 00007fadd79f7c10 RDI: 00000000ffffff9c RBP: 00007fadd79f7c10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd R13: 00007fadd91f8128 R14: 00007fadd91f8090 R15: 00007ffdf5ec7688 Modules linked in: ---[ end trace 1f234cf6e2aabe35 ]--- RIP: 0010:steam_send_report+0x66/0x310 drivers/hid/hid-steam.c:172 Code: 80 3c 18 00 74 12 4c 89 f7 e8 c6 34 3f fe 48 ba 00 00 00 00 00 fc ff df 4d 8b 26 49 8d 9c 24 98 10 00 00 48 89 d8 48 c1 e8 03 <80> 3c 10 00 74 12 48 89 df e8 9c 34 3f fe 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900029d7668 EFLAGS: 00010202 RAX: 0000000000000213 RBX: 0000000000001098 RCX: 0000000000000282 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88811930b430 RBP: ffffc900029d76b0 R08: dffffc0000000000 R09: fffff5200053aec9 R10: fffff5200053aec9 R11: 1ffff9200053aec8 R12: 0000000000000000 R13: 1ffff9200053aed8 R14: ffff88811930b430 R15: ffffc900029d76e0 FS: 00007fadd79f86c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fadd75b6000 CR3: 0000000120d69000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 4: 74 12 je 0x18 6: 4c 89 f7 mov %r14,%rdi 9: e8 c6 34 3f fe call 0xfe3f34d4 e: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 15: fc ff df 18: 4d 8b 26 mov (%r14),%r12 1b: 49 8d 9c 24 98 10 00 lea 0x1098(%r12),%rbx 22: 00 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 48 89 df mov %rbx,%rdi 33: e8 9c 34 3f fe call 0xfe3f34d4 38: 48 rex.W 39: ba 00 00 00 00 mov $0x0,%edx 3e: 00 fc add %bh,%ah