KASAN: use-after-free Read in siw_query_port (2)

Status: upstream: reported C repro on 2024/02/09 22:01
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+3abffbfcd33801a21f2f@syzkaller.appspotmail.com
First crash: 916d, last: 1d14h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/01/19 linux-6.1.y (ToT) 60ceadf9247e syz [report] KASAN: use-after-free Read in siw_query_port
2025/01/19 upstream (ToT) fda5e3f28400 syz Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: use-after-free Read in siw_query_port (2) 19 114 5d19h 974d 0/3 upstream: reported on 2023/12/13 22:42
upstream KASAN: slab-use-after-free Read in siw_query_port rdma 19 50 1074d 1189d 0/29 auto-obsoleted due to no activity on 2023/11/13 22:18
linux-6.1 KASAN: use-after-free Read in siw_query_port 19 5 1029d 1106d 0/3 auto-obsoleted due to no activity on 2024/01/27 18:37
linux-5.15 KASAN: use-after-free Read in siw_query_port 19 3 1119d 1145d 0/3 auto-obsoleted due to no activity on 2023/10/29 16:51
upstream KASAN: slab-use-after-free Read in siw_query_port (2) rdma 19 syz error inconclusive 2 611d 624d 0/29 auto-obsoleted due to no activity on 2025/04/27 10:54
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/02/03 03:00 2h36m fix candidate upstream OK (0) job log

Sample crash report:
lo 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 ffff88805474e0e0 by task kworker/1:36/4737

CPU: 1 PID: 4737 Comm: kworker/1:36 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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+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
 </TASK>

Allocated by task 5196:
 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
 loopback_net_init+0x36/0x140 drivers/net/loopback.c:215
 ops_init+0x360/0x5e0 net/core/net_namespace.c:138
 setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336
 copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:508
 create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x116/0x160 kernel/nsproxy.c:226
 ksys_unshare+0x4f6/0x8e0 kernel/fork.c:3285
 __do_sys_unshare kernel/fork.c:3359 [inline]
 __se_sys_unshare kernel/fork.c:3357 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3357
 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 31:
 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
 netdev_run_todo+0xca9/0xdb0 net/core/dev.c:10560
 default_device_exit_batch+0x963/0x9f0 net/core/dev.c:11550
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x78e/0xba0 net/core/net_namespace.c:640
 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 ffff88805474e000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 224 bytes inside of
 4096-byte region [ffff88805474e000, ffff88805474f000)

The buggy address belongs to the physical page:
page:ffffea000151d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x54748
head:ffffea000151d200 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88807d60ff81
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801744c280
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88807d60ff81
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5194, tgid 5194 (syz.3.575), ts 291719747422, free_ts 291715140072
 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_track_caller+0xa0/0x240 mm/slab_common.c:956
 kmemdup+0x27/0x60 mm/util.c:129
 kmemdup include/linux/fortify-string.h:585 [inline]
 __devinet_sysctl_register+0xa1/0x320 net/ipv4/devinet.c:2600
 devinet_sysctl_register+0x17c/0x1f0 net/ipv4/devinet.c:2652
 inetdev_init+0x2ae/0x4e0 net/ipv4/devinet.c:280
 inetdev_event+0x26f/0x13f0 net/ipv4/devinet.c:1547
 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+0x16a8/0x1b80 net/core/dev.c:10276
 __ip_tunnel_create+0x346/0x450 net/ipv4/ip_tunnel.c:267
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_slab mm/slub.c:2036 [inline]
 discard_slab mm/slub.c:2042 [inline]
 __unfreeze_partials+0x188/0x1e0 mm/slub.c:2591
 put_cpu_partial+0x17c/0x250 mm/slub.c:2667
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3383
 getname_flags+0xb7/0x500 fs/namei.c:139
 do_sys_openat2+0xdd/0x4f0 fs/open.c:1314
 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

Memory state around the buggy address:
 ffff88805474df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805474e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805474e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88805474e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805474e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (450):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/09 12:50 linux-6.1.y e4f7d8be268e 5d63f80b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2025/01/24 12:14 linux-6.1.y 75cefdf153f5 521b0ce3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2025/01/18 21:01 linux-6.1.y 60ceadf9247e f2cb035c .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/08/12 12:34 linux-6.1.y e4f7d8be268e f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/08/07 21:20 linux-6.1.y e4f7d8be268e e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/08/03 01:13 linux-6.1.y fb28aa725e05 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/31 18:53 linux-6.1.y fb28aa725e05 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/31 17:40 linux-6.1.y fb28aa725e05 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/29 08:48 linux-6.1.y dc5c83b7f5f8 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/28 08:04 linux-6.1.y dc5c83b7f5f8 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/22 02:59 linux-6.1.y 090666d3cc90 b561ce9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/21 15:07 linux-6.1.y 090666d3cc90 7c5de9c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/20 19:09 linux-6.1.y 090666d3cc90 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/20 03:11 linux-6.1.y 090666d3cc90 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/16 03:55 linux-6.1.y 090666d3cc90 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/15 20:13 linux-6.1.y 090666d3cc90 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/13 20:48 linux-6.1.y 090666d3cc90 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/11 21:07 linux-6.1.y 090666d3cc90 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/04 18:16 linux-6.1.y 090666d3cc90 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/04 11:13 linux-6.1.y fdb6fcb41cc7 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/03 07:30 linux-6.1.y fdb6fcb41cc7 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/07/02 20:18 linux-6.1.y fdb6fcb41cc7 2b70b115 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/06/14 05:25 linux-6.1.y 228da13e907e 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/06/12 08:38 linux-6.1.y 228da13e907e e93da63e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/06/07 13:31 linux-6.1.y 228da13e907e cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/05/29 07:03 linux-6.1.y dcbcab9d7079 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/05/23 16:59 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/05/23 14:52 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/05/20 00:55 linux-6.1.y c27210688955 0909d65f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/05/19 18:50 linux-6.1.y c27210688955 223544dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/05/17 05:41 linux-6.1.y c27210688955 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/05/10 05:37 linux-6.1.y ad16b162f21d 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/04/29 15:56 linux-6.1.y 7c87defbd336 7ca9e4d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/04/25 19:47 linux-6.1.y 7c87defbd336 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/04/15 07:22 linux-6.1.y 8e8fc038cad5 e2e976a8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/31 06:04 linux-6.1.y 1989cd3d56e2 d0af506e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/30 02:08 linux-6.1.y 1989cd3d56e2 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/29 00:19 linux-6.1.y 1989cd3d56e2 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/21 07:00 linux-6.1.y f2ddafa93a25 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/20 07:45 linux-6.1.y f2ddafa93a25 2f245add .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/10 06:38 linux-6.1.y f2ddafa93a25 6972f302 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/09 18:21 linux-6.1.y f2ddafa93a25 176bead5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/03/08 15:37 linux-6.1.y f2ddafa93a25 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/02/28 07:19 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/02/27 04:54 linux-6.1.y 779f9571ac3e a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/02/26 17:04 linux-6.1.y 779f9571ac3e ffa54287 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/02/25 21:52 linux-6.1.y 779f9571ac3e 94a9671e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/02/24 23:10 linux-6.1.y 779f9571ac3e 787dfb7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/02/24 18:44 linux-6.1.y 779f9571ac3e 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/02/24 04:34 linux-6.1.y 779f9571ac3e 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2024/02/09 22:01 linux-6.1.y f1bb70486c9c 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in siw_query_port
2026/08/07 05:27 linux-6.1.y 03f3a99e8e93 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in siw_query_port
2026/04/28 03:11 linux-6.1.y 7c87defbd336 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in siw_query_port
* Struck through repros no longer work on HEAD.