================================================================== BUG: KASAN: slab-out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: slab-out-of-bounds in atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:615 [inline] BUG: KASAN: slab-out-of-bounds in try_module_get+0x4f/0xf0 kernel/module/main.c:839 Write of size 4 at addr ffff8880292b87a0 by task syz.7.161/5467 CPU: 1 PID: 5467 Comm: syz.7.161 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:615 [inline] try_module_get+0x4f/0xf0 kernel/module/main.c:839 dvb_device_open+0xf0/0x360 drivers/media/dvb-core/dvbdev.c:103 chrdev_open+0x585/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7dd/0x10b0 fs/open.c:882 do_open fs/namei.c:3634 [inline] path_openat+0x2674/0x2f10 fs/namei.c:3791 do_filp_open+0x1ee/0x420 fs/namei.c:3818 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f87d175e68e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007f87d25deb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f87d25df6c0 RCX: 00007f87d175e68e RDX: 0000000000000002 RSI: 00007f87d25dec00 RDI: ffffffffffffff9c RBP: 00007f87d25dec00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007f87d1a26128 R14: 00007f87d1a26090 R15: 00007ffc1a9f2ae8 Allocated by task 2: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] set_kthread_struct+0xb3/0x1f0 kernel/kthread.c:117 copy_process+0x1366/0x40c0 kernel/fork.c:2284 kernel_clone+0x24b/0x900 kernel/fork.c:2764 kernel_thread+0x118/0x180 kernel/fork.c:2824 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x54f/0x700 kernel/kthread.c:748 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8880292b8600 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 160 bytes to the right of 256-byte region [ffff8880292b8600, ffff8880292b8700) The buggy address belongs to the physical page: page:ffffea0000a4ae00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x292b8 head:ffffea0000a4ae00 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f8d600 dead000000000007 ffff888017441b40 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2, tgid 2 (kthreadd), ts 13789463723, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] set_kthread_struct+0xb3/0x1f0 kernel/kthread.c:117 copy_process+0x1366/0x40c0 kernel/fork.c:2284 kernel_clone+0x24b/0x900 kernel/fork.c:2764 kernel_thread+0x118/0x180 kernel/fork.c:2824 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x54f/0x700 kernel/kthread.c:748 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page_owner free stack trace missing Memory state around the buggy address: ffff8880292b8680: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff8880292b8700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880292b8780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880292b8800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880292b8880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ==================================================================