================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1779 [inline] BUG: KASAN: use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:176 [inline] BUG: KASAN: use-after-free in mutex_lock+0x80/0x1a0 kernel/locking/mutex.c:295 Write of size 8 at addr ffff88810a6d9450 by task udevd/480 CPU: 0 PID: 480 Comm: udevd Not tainted 6.1.141-syzkaller-1169946-g145c7fad733f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x71/0x210 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:427 kasan_report+0x122/0x150 mm/kasan/report.c:531 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:102 [inline] atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1779 [inline] __mutex_trylock_fast kernel/locking/mutex.c:176 [inline] mutex_lock+0x80/0x1a0 kernel/locking/mutex.c:295 steam_input_open+0x91/0x160 drivers/hid/hid-steam.c:297 input_open_device+0x17b/0x300 drivers/input/input.c:650 evdev_open_device drivers/input/evdev.c:400 [inline] evdev_open+0x4b1/0x5c0 drivers/input/evdev.c:487 chrdev_open+0x5a5/0x680 fs/char_dev.c:414 do_dentry_open+0x88e/0x1260 fs/open.c:884 vfs_open+0x73/0x80 fs/open.c:1015 do_open fs/namei.c:3625 [inline] path_openat+0x2681/0x2f50 fs/namei.c:3782 do_filp_open+0x1c1/0x3c0 fs/namei.c:3809 do_sys_openat2+0x185/0x7e0 fs/open.c:1341 do_sys_open fs/open.c:1357 [inline] __do_sys_openat fs/open.c:1373 [inline] __se_sys_openat fs/open.c:1368 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1368 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2dc06a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffca5947350 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f2dc0d64880 RCX: 00007f2dc06a7407 RDX: 0000000000080000 RSI: 0000564f0b534510 RDI: ffffffffffffff9c RBP: 0000564f0b7918f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000564eeb3ef0c8 R13: 0000564eeb3ef0ce R14: 00007ffca5947950 R15: 0000564eeb3f5bcc Allocated by task 222: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:388 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958 alloc_dr drivers/base/devres.c:116 [inline] devm_kmalloc+0x55/0x160 drivers/base/devres.c:833 devm_kzalloc include/linux/device.h:211 [inline] steam_probe+0x11b/0xb50 drivers/hid/hid-steam.c:741 hid_device_probe+0x268/0x390 drivers/hid/hid-core.c:2626 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2cb/0x960 drivers/base/dd.c:639 __driver_probe_device+0x198/0x280 drivers/base/dd.c:808 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966 bus_for_each_drv+0x183/0x210 drivers/base/bus.c:429 __device_attach+0x2a2/0x400 drivers/base/dd.c:1038 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087 bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489 device_add+0xb4d/0xef0 drivers/base/core.c:3698 hid_add_device+0x38f/0x540 drivers/hid/hid-core.c:2778 usbhid_probe+0xbb6/0xfa0 drivers/hid/usbhid/hid-core.c:1424 usb_probe_interface+0x610/0xaf0 drivers/usb/core/driver.c:397 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2cb/0x960 drivers/base/dd.c:639 __driver_probe_device+0x198/0x280 drivers/base/dd.c:808 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966 bus_for_each_drv+0x183/0x210 drivers/base/bus.c:429 __device_attach+0x2a2/0x400 drivers/base/dd.c:1038 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087 bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489 device_add+0xb4d/0xef0 drivers/base/core.c:3698 usb_set_configuration+0x19c2/0x1f10 drivers/usb/core/message.c:2165 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x159/0x270 drivers/usb/core/driver.c:294 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2cb/0x960 drivers/base/dd.c:639 __driver_probe_device+0x198/0x280 drivers/base/dd.c:808 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966 bus_for_each_drv+0x183/0x210 drivers/base/bus.c:429 __device_attach+0x2a2/0x400 drivers/base/dd.c:1038 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087 bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489 device_add+0xb4d/0xef0 drivers/base/core.c:3698 usb_new_device+0xa70/0x1520 drivers/usb/core/hub.c:2656 hub_port_connect drivers/usb/core/hub.c:5566 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5866 [inline] hub_event+0x2a5d/0x4680 drivers/usb/core/hub.c:5948 process_one_work+0x71f/0xc40 kernel/workqueue.c:2299 worker_thread+0xa29/0x11f0 kernel/workqueue.c:2446 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 6: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x31/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:241 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1745 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1771 slab_free mm/slub.c:3686 [inline] __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3702 kfree+0x6f/0xf0 mm/slab_common.c:990 release_nodes+0xf9/0x230 drivers/base/devres.c:503 devres_release_all+0x149/0x1b0 drivers/base/devres.c:532 device_unbind_cleanup drivers/base/dd.c:530 [inline] __device_release_driver drivers/base/dd.c:1288 [inline] device_release_driver_internal+0x581/0x820 drivers/base/dd.c:1309 device_release_driver+0x19/0x20 drivers/base/dd.c:1332 bus_remove_device+0x2ee/0x350 drivers/base/bus.c:531 device_del+0x6a4/0xeb0 drivers/base/core.c:3886 hid_remove_device drivers/hid/hid-core.c:2826 [inline] hid_destroy_device+0x6a/0x110 drivers/hid/hid-core.c:2845 usbhid_disconnect+0x9f/0xc0 drivers/hid/usbhid/hid-core.c:1451 usb_unbind_interface+0x223/0x8d0 drivers/usb/core/driver.c:459 device_remove drivers/base/dd.c:550 [inline] __device_release_driver drivers/base/dd.c:1283 [inline] device_release_driver_internal+0x508/0x820 drivers/base/dd.c:1309 device_release_driver+0x19/0x20 drivers/base/dd.c:1332 bus_remove_device+0x2ee/0x350 drivers/base/bus.c:531 device_del+0x6a4/0xeb0 drivers/base/core.c:3886 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1414 usb_disconnect+0x31e/0x860 drivers/usb/core/hub.c:2311 hub_port_connect drivers/usb/core/hub.c:5405 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5866 [inline] hub_event+0x1bd5/0x4680 drivers/usb/core/hub.c:5948 process_one_work+0x71f/0xc40 kernel/workqueue.c:2299 worker_thread+0xa29/0x11f0 kernel/workqueue.c:2446 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88810a6d9400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 80 bytes inside of 512-byte region [ffff88810a6d9400, ffff88810a6d9600) The buggy address belongs to the physical page: page:ffffea000429b600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a6d8 head:ffffea000429b600 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100042f00 raw: 0000000000000000 0000000000100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 1750353562, free_ts 1750179267 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637 prep_new_page+0x1c/0x110 mm/page_alloc.c:2644 get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4539 __alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5850 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1962 [inline] new_slab+0x98/0x3d0 mm/slub.c:2015 ___slab_alloc+0x6f6/0xb50 mm/slub.c:3203 __slab_alloc+0x5e/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3462 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc+0xa1/0x1e0 mm/slab_common.c:951 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] new_dir fs/proc/proc_sysctl.c:969 [inline] get_subdir fs/proc/proc_sysctl.c:1013 [inline] __register_sysctl_table+0x92e/0xe30 fs/proc/proc_sysctl.c:1375 register_sysctl fs/proc/proc_sysctl.c:1417 [inline] register_sysctl_mount_point+0x23/0x30 fs/proc/proc_sysctl.c:47 init_fs_stat_sysctls+0x2f/0x34 fs/file_table.c:125 do_one_initcall+0x198/0x530 init/main.c:1298 do_initcall_level+0x16f/0x2d0 init/main.c:1371 do_initcalls+0x50/0x92 init/main.c:1387 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1545 [inline] free_pcp_prepare mm/page_alloc.c:1619 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3581 free_unref_page+0x8f/0x530 mm/page_alloc.c:3677 free_the_page mm/page_alloc.c:830 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:5939 free_pages+0x82/0x90 mm/page_alloc.c:5950 __stack_depot_save+0x457/0x480 lib/stackdepot.c:506 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x60/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x72/0x80 mm/kasan/common.c:333 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768 slab_alloc_node mm/slub.c:3421 [inline] slab_alloc mm/slub.c:3431 [inline] __kmem_cache_alloc_lru mm/slub.c:3438 [inline] kmem_cache_alloc_lru+0x104/0x280 mm/slub.c:3454 alloc_inode_sb include/linux/fs.h:3263 [inline] alloc_inode fs/inode.c:263 [inline] new_inode_pseudo+0x8f/0x1f0 fs/inode.c:1063 new_inode+0x28/0x1e0 fs/inode.c:1091 simple_fill_super+0xcd/0x5c0 fs/libfs.c:658 trace_fill_super+0xcd/0x160 fs/tracefs/inode.c:371 mount_single+0xcc/0x1d0 fs/super.c:1542 trace_mount+0x2c/0x40 fs/tracefs/inode.c:391 Memory state around the buggy address: ffff88810a6d9300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810a6d9380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88810a6d9400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810a6d9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810a6d9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== hid 0003:28DE:1102.0008: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.0008: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.0008: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.0008: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.0008: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read hid 0003:28DE:1102.000E: No HID_FEATURE_REPORT submitted - nothing to read