================================================================== 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:838 Write of size 4 at addr ffff88801fb74f90 by task syz.2.1814/15414 CPU: 1 PID: 15414 Comm: syz.2.1814 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:838 dvb_device_open+0xf1/0x370 drivers/media/dvb-core/dvbdev.c:103 chrdev_open+0x5c5/0x6a0 fs/char_dev.c:414 do_dentry_open+0x7e9/0x10d0 fs/open.c:882 do_open fs/namei.c:3634 [inline] path_openat+0x2635/0x2ee0 fs/namei.c:3791 do_filp_open+0x1f1/0x430 fs/namei.c:3818 do_sys_openat2+0x150/0x4b0 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: 0033:0x7f462e35cfce 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:00007f462f1cdb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f462f1ce6c0 RCX: 00007f462e35cfce RDX: 0000000000000002 RSI: 00007f462f1cdc00 RDI: ffffffffffffff9c RBP: 00007f462f1cdc00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007f462e616128 R14: 00007f462e616090 R15: 00007ffefe204fd8 Allocated by task 13446: 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 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xb0/0x240 mm/slab_common.c:943 kmalloc_array_node include/linux/slab.h:676 [inline] kcalloc_node include/linux/slab.h:681 [inline] memcg_alloc_slab_cgroups+0x83/0x120 mm/memcontrol.c:2889 account_slab mm/slab.h:635 [inline] allocate_slab mm/slub.c:1962 [inline] new_slab+0xc3/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x1b7/0x2f0 mm/slub.c:3383 vm_area_dup+0x23/0x1a0 kernel/fork.c:467 __split_vma+0xb9/0x500 mm/mmap.c:2363 mprotect_fixup+0x5b1/0x800 mm/mprotect.c:623 do_mprotect_pkey+0x7fe/0xba0 mm/mprotect.c:792 __do_sys_mprotect mm/mprotect.c:819 [inline] __se_sys_mprotect mm/mprotect.c:816 [inline] __x64_sys_mprotect+0x7c/0x90 mm/mprotect.c:816 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 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 kvfree_call_rcu+0x103/0x870 kernel/rcu/tree.c:3405 ipmr_net_exit_batch+0x46/0x90 net/ipv4/ipmr.c:3132 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x791/0xba0 net/core/net_namespace.c:640 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3c0 kernel/workqueue.c:1361 __queue_work+0xba3/0xfb0 kernel/workqueue.c:1520 queue_work_on+0x124/0x1f0 kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:659 [inline] netdevice_event+0x802/0x900 drivers/infiniband/core/roce_gid_mgmt.c:802 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] register_netdevice+0x163f/0x1b00 net/core/dev.c:10250 __ip_tunnel_create+0x346/0x450 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x2ac/0x780 net/ipv4/ip_tunnel.c:1104 ops_init+0x355/0x5f0 net/core/net_namespace.c:138 setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336 copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:508 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x116/0x160 kernel/nsproxy.c:226 ksys_unshare+0x4ca/0x8b0 kernel/fork.c:3282 __do_sys_unshare kernel/fork.c:3353 [inline] __se_sys_unshare kernel/fork.c:3351 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3351 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 The buggy address belongs to the object at ffff88801fb74f00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 144 bytes inside of 192-byte region [ffff88801fb74f00, ffff88801fb74fc0) The buggy address belongs to the physical page: page:ffffea00007edd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801fb74900 pfn:0x1fb74 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00005d8608 ffffea000062a048 ffff888017441a00 raw: ffff88801fb74900 000000000010000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5286, tgid 5286 (dhcpcd-run-hook), ts 231172482088, free_ts 231165971020 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5643 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_slab_page+0x4f/0x160 mm/slub.c:1801 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa0/0x240 mm/slab_common.c:943 kmalloc_array_node include/linux/slab.h:676 [inline] kcalloc_node include/linux/slab.h:681 [inline] memcg_alloc_slab_cgroups+0x83/0x120 mm/memcontrol.c:2889 account_slab mm/slab.h:635 [inline] allocate_slab mm/slub.c:1962 [inline] new_slab+0xc3/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x1b7/0x2f0 mm/slub.c:3383 vm_area_dup+0x23/0x1a0 kernel/fork.c:467 dup_mmap kernel/fork.c:646 [inline] dup_mm kernel/fork.c:1546 [inline] copy_mm+0xb28/0x1690 kernel/fork.c:1595 copy_process+0x1979/0x4030 kernel/fork.c:2356 kernel_clone+0x24b/0x900 kernel/fork.c:2762 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3554 release_pages+0x1fa6/0x2220 mm/swap.c:1035 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:261 tlb_finish_mmu+0xbd/0x1c0 mm/mmu_gather.c:361 exit_mmap+0x384/0x960 mm/mmap.c:3262 __mmput+0x118/0x3c0 kernel/fork.c:1205 exit_mm+0x1fe/0x2d0 kernel/exit.c:565 do_exit+0x905/0x2480 kernel/exit.c:867 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 __do_sys_exit_group kernel/exit.c:1033 [inline] __se_sys_exit_group kernel/exit.c:1031 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031 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 Memory state around the buggy address: ffff88801fb74e80: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff88801fb74f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801fb74f80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801fb75000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801fb75080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================