wlan0 speed is unknown, defaulting to 1000
==================================================================
BUG: KASAN: use-after-free in siw_query_port+0x358/0x450 drivers/infiniband/sw/siw/siw_verbs.c:177
Read of size 4 at addr ffff88805598c0e0 by task kworker/1:16/14557

CPU: 1 PID: 14557 Comm: kworker/1:16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: infiniband ib_cache_event_task
Call Trace:
 <TASK>
 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+0x358/0x450 drivers/infiniband/sw/siw/siw_verbs.c:177
 ib_cache_update+0x1bf/0x9c0 drivers/infiniband/core/cache.c:1490
 ib_cache_event_task+0xdc/0x1d0 drivers/infiniband/core/cache.c:1564
 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
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001566300 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5598c
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001d13908 ffff8880b8e413f0 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x102c00(GFP_NOIO|__GFP_NOWARN|__GFP_HARDWALL), pid 4473, tgid 4473 (kworker/u4:13), ts 1485106305775, free_ts 1485106312278
 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:5657
 __stack_depot_save+0x35a/0x460 lib/stackdepot.c:474
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_set_track+0x60/0x70 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]
 call_usermodehelper_setup+0x8a/0x260 kernel/umh.c:366
 kobject_uevent_env+0x659/0x8a0 lib/kobject_uevent.c:629
 device_del+0x958/0xaf0 drivers/base/core.c:3905
 __ib_unregister_device+0x8a/0x170 drivers/infiniband/core/device.c:1496
 ib_unregister_work+0x15/0x30 drivers/infiniband/core/device.c:1601
 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
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+0x2e/0x3f0 mm/page_alloc.c:3508
 __stack_depot_save+0x435/0x460 lib/stackdepot.c:506
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_set_track+0x60/0x70 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]
 call_usermodehelper_setup+0x8a/0x260 kernel/umh.c:366
 kobject_uevent_env+0x659/0x8a0 lib/kobject_uevent.c:629
 device_del+0x958/0xaf0 drivers/base/core.c:3905
 __ib_unregister_device+0x8a/0x170 drivers/infiniband/core/device.c:1496
 ib_unregister_work+0x15/0x30 drivers/infiniband/core/device.c:1601
 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

Memory state around the buggy address:
 ffff88805598bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805598c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88805598c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff88805598c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805598c180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================