netdevsim0 speed is unknown, defaulting to 1000 ================================================================== BUG: KASAN: use-after-free in siw_query_port+0x359/0x450 drivers/infiniband/sw/siw/siw_verbs.c:177 Read of size 4 at addr ffff8880568140e0 by task kworker/0:11/11219 CPU: 0 PID: 11219 Comm: kworker/0:11 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: infiniband ib_cache_event_task 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 siw_query_port+0x359/0x450 drivers/infiniband/sw/siw/siw_verbs.c:177 ib_cache_update+0x1bd/0x9c0 drivers/infiniband/core/cache.c:1490 ib_cache_event_task+0xcf/0x1c0 drivers/infiniband/core/cache.c:1564 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 4284: 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+0xb2/0x240 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x6c/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvzalloc include/linux/slab.h:724 [inline] alloc_netdev_mqs+0x84/0xf10 net/core/dev.c:10770 nsim_create+0x7f/0x400 drivers/net/netdevsim/netdev.c:350 __nsim_dev_port_add+0x75b/0xbc0 drivers/net/netdevsim/dev.c:1396 nsim_dev_port_add_all+0x35/0xe0 drivers/net/netdevsim/dev.c:1454 nsim_drv_probe+0x840/0xb20 drivers/net/netdevsim/dev.c:1609 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:639 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:805 driver_probe_device+0x4f/0x420 drivers/base/dd.c:835 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:963 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2a7/0x480 drivers/base/dd.c:1035 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489 device_add+0xbcf/0x1050 drivers/base/core.c:3712 nsim_bus_dev_new drivers/net/netdevsim/bus.c:290 [inline] new_device_store+0x378/0x690 drivers/net/netdevsim/bus.c:167 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x482/0x9a0 fs/read_write.c:584 ksys_write+0x14d/0x260 fs/read_write.c:637 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 Freed by task 4374: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x200 mm/slub.c:3700 device_release+0x92/0x1c0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x217/0x450 lib/kobject.c:729 __nsim_dev_port_del+0x155/0x1c0 drivers/net/netdevsim/dev.c:1433 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1445 [inline] nsim_dev_reload_destroy+0x283/0x480 drivers/net/netdevsim/dev.c:1663 nsim_dev_reload_down+0x86/0xb0 drivers/net/netdevsim/dev.c:968 devlink_reload+0x202/0x690 net/devlink/leftover.c:4472 devlink_pernet_pre_exit+0x122/0x280 net/devlink/leftover.c:12503 ops_pre_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x58e/0xba0 net/core/net_namespace.c:620 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888056814000 which belongs to the cache kmalloc-cg-8k of size 8192 The buggy address is located 224 bytes inside of 8192-byte region [ffff888056814000, ffff888056816000) The buggy address belongs to the physical page: page:ffffea00015a0400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56810 head:ffffea00015a0400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801744c3c0 raw: 0000000000000000 0000000000020002 00000001ffffffff 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 0xd60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4275, tgid 4275 (syz-executor), ts 66502200175, free_ts 15187476799 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 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa2/0x240 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x6c/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvzalloc include/linux/slab.h:724 [inline] alloc_netdev_mqs+0x84/0xf10 net/core/dev.c:10770 nsim_create+0x7f/0x400 drivers/net/netdevsim/netdev.c:350 __nsim_dev_port_add+0x75b/0xbc0 drivers/net/netdevsim/dev.c:1396 nsim_dev_port_add_all+0x35/0xe0 drivers/net/netdevsim/dev.c:1454 nsim_drv_probe+0x840/0xb20 drivers/net/netdevsim/dev.c:1609 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:639 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:805 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_contig_range+0x9d/0x150 mm/page_alloc.c:9626 destroy_args+0xef/0xa0e mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x33c/0x38e mm/debug_vm_pgtable.c:1359 do_one_initcall+0x257/0x800 init/main.c:1309 do_initcall_level+0x13d/0x1ed init/main.c:1382 do_initcalls+0x4b/0x8a init/main.c:1398 kernel_init_freeable+0x401/0x5ab init/main.c:1637 kernel_init+0x19/0x1b0 init/main.c:1525 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888056813f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888056814000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888056814080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888056814100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888056814180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================