Extracting prog: 3m39.746902376s
Minimizing prog: 26m0.068146934s
Simplifying prog options: 11m30.0679661s
Extracting C: 4m21.371260642s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program crashed: KASAN: slab-use-after-free Read in __ethtool_get_link_ksettings
single: successfully extracted reproducer
found reproducer with 2 syscalls
minimizing guilty program
testing program (duration=4m17.15343484s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink
detailed listing:
executing program 0:
socket$netlink(0x10, 0x3, 0x14)

program did not crash
testing program (duration=4m17.15343484s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
sendmsg$RDMA_NLDEV_CMD_NEWLINK(0xffffffffffffffff, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program did not crash
testing program (duration=4m17.15343484s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, 0x0, 0x0)

program did not crash
testing program (duration=4m17.15343484s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x80}, 0x0)

program did not crash
testing program (duration=4m17.15343484s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={0x0, 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program did not crash
testing program (duration=4m17.15343484s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=4m17.15343484s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
program did not crash
simplifying guilty program options
testing program (duration=4m17.15343484s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program crashed: KASAN: slab-use-after-free Read in __ethtool_get_link_ksettings
extracting C reproducer
testing compiled C program (duration=4m17.15343484s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
program did not crash
testing program (duration=4m17.15343484s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program did not crash
testing program (duration=4m17.15343484s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program crashed: KASAN: slab-use-after-free Read in __ethtool_get_link_ksettings
validation run: crashed=true
testing program (duration=4m17.15343484s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program crashed: KASAN: slab-use-after-free Read in __ethtool_get_link_ksettings
validation run: crashed=true
testing program (duration=4m17.15343484s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendmsg$RDMA_NLDEV_CMD_NEWLINK
detailed listing:
executing program 0:
r0 = socket$netlink(0x10, 0x3, 0x14)
sendmsg$RDMA_NLDEV_CMD_NEWLINK(r0, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000040)=ANY=[@ANYBLOB="380000000314010000000000fbdbdf250900020073797a10000000000800410072786500140033006970766c616e300000"], 0x38}, 0x1, 0x0, 0x0, 0x80}, 0x0)

program crashed: KASAN: slab-use-after-free Read in __ethtool_get_link_ksettings
validation run: crashed=true
reproducing took 50m19.931117215s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: slab-use-after-free in netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
BUG: KASAN: slab-use-after-free in netdev_lock_ops include/net/netdev_lock.h:41 [inline]
BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x20c/0x254 net/ethtool/ioctl.c:463
Read of size 1 at addr ffff0000ceba8e11 by task kworker/0:2/1938

CPU: 0 UID: 0 PID: 1938 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: events smc_ib_port_event_work
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
 netdev_lock_ops include/net/netdev_lock.h:41 [inline]
 __ethtool_get_link_ksettings+0x20c/0x254 net/ethtool/ioctl.c:463
 ipvlan_ethtool_get_link_ksettings+0x48/0x58 drivers/net/ipvlan/ipvlan_main.c:467
 netif_get_link_ksettings+0x220/0x2bc net/ethtool/ioctl.c:451
 __ethtool_get_link_ksettings+0x114/0x254 net/ethtool/ioctl.c:464
 ib_get_eth_speed+0x154/0x6b0 drivers/infiniband/core/verbs.c:2061
 rxe_query_port+0x98/0x37c drivers/infiniband/sw/rxe/rxe_verbs.c:56
 __ib_query_port drivers/infiniband/core/device.c:2304 [inline]
 ib_query_port+0x16c/0x76c drivers/infiniband/core/device.c:2336
 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline]
 smc_ib_port_event_work+0xf4/0x8a4 net/smc/smc_ib.c:388
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

Allocated by task 10083:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5414 [inline]
 __kvmalloc_node_noprof+0x3e0/0x7fc mm/slub.c:7005
 alloc_netdev_mqs+0xac/0xf34 net/core/dev.c:12117
 rtnl_create_link+0x2b0/0xb78 net/core/rtnetlink.c:3777
 rtnl_newlink_create+0x210/0x6b8 net/core/rtnetlink.c:3959
 __rtnl_newlink net/core/rtnetlink.c:4098 [inline]
 rtnl_newlink+0xfe4/0x138c net/core/rtnetlink.c:4215
 rtnetlink_rcv_msg+0x66c/0x9bc net/core/rtnetlink.c:7132
 netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2556
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:7159
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg+0xc8/0x17c net/socket.c:815
 __sys_sendto+0x250/0x328 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __arm64_sys_sendto+0xec/0x10c net/socket.c:2284
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

Freed by task 1895:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6499 [inline]
 kfree+0x188/0x698 mm/slub.c:6792
 kvfree+0x30/0x40 mm/slub.c:7054
 netdev_release+0x88/0xb0 net/core/net-sysfs.c:2231
 device_release+0xb4/0x1d4 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1dc/0x4b8 lib/kobject.c:737
 netdev_run_todo+0xc80/0xe14 net/core/dev.c:11818
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:157
 default_device_exit_batch+0x520/0x59c net/core/dev.c:13289
 ops_exit_list net/core/net_namespace.c:206 [inline]
 ops_undo_list+0x434/0x81c net/core/net_namespace.c:253
 cleanup_net+0x474/0x6c4 net/core/net_namespace.c:706
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

The buggy address belongs to the object at ffff0000ceba8000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 3601 bytes inside of
 freed 4096-byte region [ffff0000ceba8000, ffff0000ceba9000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10eba8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff0000ceba9011
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c000b500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000300040004 00000000f5000000 ffff0000ceba9011
head: 05ffc00000000040 ffff0000c000b500 dead000000000100 dead000000000122
head: 0000000000000000 0000000300040004 00000000f5000000 ffff0000ceba9011
head: 05ffc00000000003 fffffdffc33aea01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ceba8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ceba8d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000ceba8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff0000ceba8e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ceba8f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Unable to handle kernel paging request at virtual address 000bc05820000143
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0
[000bc05820000143] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 1938 Comm: kworker/0:2 Tainted: G    B               syzkaller #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: events smc_ib_port_event_work
pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
pc : netdev_lock_ops include/net/netdev_lock.h:41 [inline]
pc : __ethtool_get_link_ksettings+0xc4/0x254 net/ethtool/ioctl.c:463
lr : netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
lr : netdev_lock_ops include/net/netdev_lock.h:41 [inline]
lr : __ethtool_get_link_ksettings+0xb8/0x254 net/ethtool/ioctl.c:463
sp : ffff800096647780
x29: ffff800096647780 x28: ffff0000c005e400 x27: 0000000000000000
x26: 1fffe00019d75001 x25: 1fffe00019d751c2 x24: ffff0000ceba8008
x23: ffff0000ceba8e11 x22: dfff800000000000 x21: 006202c100000a1f
x20: ffff8000966478c0 x19: ffff0000ceba8000 x18: 1fffe00035b9ec28
x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d
x14: 3d3d3d3d3d3d3d3d x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: ffff700011481921 x9 : ffff80008e94a9e0
x8 : 000c405820000143 x7 : 0000000000000000 x6 : ffff80008048e314
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000020
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] (P)
 netdev_lock_ops include/net/netdev_lock.h:41 [inline] (P)
 __ethtool_get_link_ksettings+0xc4/0x254 net/ethtool/ioctl.c:463 (P)
 ipvlan_ethtool_get_link_ksettings+0x48/0x58 drivers/net/ipvlan/ipvlan_main.c:467
 netif_get_link_ksettings+0x220/0x2bc net/ethtool/ioctl.c:451
 __ethtool_get_link_ksettings+0x114/0x254 net/ethtool/ioctl.c:464
 ib_get_eth_speed+0x154/0x6b0 drivers/infiniband/core/verbs.c:2061
 rxe_query_port+0x98/0x37c drivers/infiniband/sw/rxe/rxe_verbs.c:56
 __ib_query_port drivers/infiniband/core/device.c:2304 [inline]
 ib_query_port+0x16c/0x76c drivers/infiniband/core/device.c:2336
 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline]
 smc_ib_port_event_work+0xf4/0x8a4 net/smc/smc_ib.c:388
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
Code: 96ed970c f9400308 910ae115 d343fea8 (38766908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	96ed970c 	bl	0xfffffffffbb65c30
   4:	f9400308 	ldr	x8, [x24]
   8:	910ae115 	add	x21, x8, #0x2b8
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	38766908 	ldrb	w8, [x8, x22] <-- trapping instruction

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: slab-use-after-free in netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
BUG: KASAN: slab-use-after-free in netdev_lock_ops include/net/netdev_lock.h:41 [inline]
BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x20c/0x254 net/ethtool/ioctl.c:463
Read of size 1 at addr ffff0000ceba8e11 by task kworker/0:2/1938

CPU: 0 UID: 0 PID: 1938 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: events smc_ib_port_event_work
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
 netdev_lock_ops include/net/netdev_lock.h:41 [inline]
 __ethtool_get_link_ksettings+0x20c/0x254 net/ethtool/ioctl.c:463
 ipvlan_ethtool_get_link_ksettings+0x48/0x58 drivers/net/ipvlan/ipvlan_main.c:467
 netif_get_link_ksettings+0x220/0x2bc net/ethtool/ioctl.c:451
 __ethtool_get_link_ksettings+0x114/0x254 net/ethtool/ioctl.c:464
 ib_get_eth_speed+0x154/0x6b0 drivers/infiniband/core/verbs.c:2061
 rxe_query_port+0x98/0x37c drivers/infiniband/sw/rxe/rxe_verbs.c:56
 __ib_query_port drivers/infiniband/core/device.c:2304 [inline]
 ib_query_port+0x16c/0x76c drivers/infiniband/core/device.c:2336
 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline]
 smc_ib_port_event_work+0xf4/0x8a4 net/smc/smc_ib.c:388
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

Allocated by task 10083:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5414 [inline]
 __kvmalloc_node_noprof+0x3e0/0x7fc mm/slub.c:7005
 alloc_netdev_mqs+0xac/0xf34 net/core/dev.c:12117
 rtnl_create_link+0x2b0/0xb78 net/core/rtnetlink.c:3777
 rtnl_newlink_create+0x210/0x6b8 net/core/rtnetlink.c:3959
 __rtnl_newlink net/core/rtnetlink.c:4098 [inline]
 rtnl_newlink+0xfe4/0x138c net/core/rtnetlink.c:4215
 rtnetlink_rcv_msg+0x66c/0x9bc net/core/rtnetlink.c:7132
 netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2556
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:7159
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg+0xc8/0x17c net/socket.c:815
 __sys_sendto+0x250/0x328 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __arm64_sys_sendto+0xec/0x10c net/socket.c:2284
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

Freed by task 1895:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6499 [inline]
 kfree+0x188/0x698 mm/slub.c:6792
 kvfree+0x30/0x40 mm/slub.c:7054
 netdev_release+0x88/0xb0 net/core/net-sysfs.c:2231
 device_release+0xb4/0x1d4 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1dc/0x4b8 lib/kobject.c:737
 netdev_run_todo+0xc80/0xe14 net/core/dev.c:11818
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:157
 default_device_exit_batch+0x520/0x59c net/core/dev.c:13289
 ops_exit_list net/core/net_namespace.c:206 [inline]
 ops_undo_list+0x434/0x81c net/core/net_namespace.c:253
 cleanup_net+0x474/0x6c4 net/core/net_namespace.c:706
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

The buggy address belongs to the object at ffff0000ceba8000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 3601 bytes inside of
 freed 4096-byte region [ffff0000ceba8000, ffff0000ceba9000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10eba8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff0000ceba9011
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c000b500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000300040004 00000000f5000000 ffff0000ceba9011
head: 05ffc00000000040 ffff0000c000b500 dead000000000100 dead000000000122
head: 0000000000000000 0000000300040004 00000000f5000000 ffff0000ceba9011
head: 05ffc00000000003 fffffdffc33aea01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ceba8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ceba8d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000ceba8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff0000ceba8e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ceba8f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Unable to handle kernel paging request at virtual address 000bc05820000143
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0
[000bc05820000143] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 1938 Comm: kworker/0:2 Tainted: G    B               syzkaller #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: events smc_ib_port_event_work
pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
pc : netdev_lock_ops include/net/netdev_lock.h:41 [inline]
pc : __ethtool_get_link_ksettings+0xc4/0x254 net/ethtool/ioctl.c:463
lr : netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
lr : netdev_lock_ops include/net/netdev_lock.h:41 [inline]
lr : __ethtool_get_link_ksettings+0xb8/0x254 net/ethtool/ioctl.c:463
sp : ffff800096647780
x29: ffff800096647780 x28: ffff0000c005e400 x27: 0000000000000000
x26: 1fffe00019d75001 x25: 1fffe00019d751c2 x24: ffff0000ceba8008
x23: ffff0000ceba8e11 x22: dfff800000000000 x21: 006202c100000a1f
x20: ffff8000966478c0 x19: ffff0000ceba8000 x18: 1fffe00035b9ec28
x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d
x14: 3d3d3d3d3d3d3d3d x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: ffff700011481921 x9 : ffff80008e94a9e0
x8 : 000c405820000143 x7 : 0000000000000000 x6 : ffff80008048e314
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000020
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] (P)
 netdev_lock_ops include/net/netdev_lock.h:41 [inline] (P)
 __ethtool_get_link_ksettings+0xc4/0x254 net/ethtool/ioctl.c:463 (P)
 ipvlan_ethtool_get_link_ksettings+0x48/0x58 drivers/net/ipvlan/ipvlan_main.c:467
 netif_get_link_ksettings+0x220/0x2bc net/ethtool/ioctl.c:451
 __ethtool_get_link_ksettings+0x114/0x254 net/ethtool/ioctl.c:464
 ib_get_eth_speed+0x154/0x6b0 drivers/infiniband/core/verbs.c:2061
 rxe_query_port+0x98/0x37c drivers/infiniband/sw/rxe/rxe_verbs.c:56
 __ib_query_port drivers/infiniband/core/device.c:2304 [inline]
 ib_query_port+0x16c/0x76c drivers/infiniband/core/device.c:2336
 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline]
 smc_ib_port_event_work+0xf4/0x8a4 net/smc/smc_ib.c:388
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
Code: 96ed970c f9400308 910ae115 d343fea8 (38766908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	96ed970c 	bl	0xfffffffffbb65c30
   4:	f9400308 	ldr	x8, [x24]
   8:	910ae115 	add	x21, x8, #0x2b8
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	38766908 	ldrb	w8, [x8, x22] <-- trapping instruction