Extracting prog: 3m48.994524509s
Minimizing prog: 22m47.40559373s
Simplifying prog options: 15m54.843851714s
Extracting C: 5m15.156943186s
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:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, &(0x7f0000000000), 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

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:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, &(0x7f0000000000), 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program crashed: lost connection to test machine
single: successfully extracted reproducer
found reproducer with 2 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register
detailed listing:
executing program 0:
openat$binfmt_register(0xffffffffffffff9c, &(0x7f0000000000), 0x1, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): write$binfmt_register
detailed listing:
executing program 0:
write$binfmt_register(0xffffffffffffffff, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program crashed: WARNING in get_data
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program crashed: WARNING in get_data
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=6m0s, {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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program crashed: WARNING in get_data
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
validation run: crashed=false
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
validation run: crashed=false
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
validation run: crashed=false
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
validation run: crashed=false
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program crashed: WARNING in get_data
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
validation run: crashed=false
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
validation run: crashed=false
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program did not crash
validation run: crashed=false
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$binfmt_register-write$binfmt_register
detailed listing:
executing program 0:
r0 = openat$binfmt_register(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write$binfmt_register(r0, &(0x7f0000000280)={0x3a, 'syz3', 0x3a, 'M', 0x3a, 0x2, 0x3a, '&', 0x3a, '\x05\x00\x02\x00--', 0x3a, './file0'}, 0x2e)

program crashed: WARNING in get_data
validation run: crashed=true
reproducing took 1h44m24.84058565s
repro crashed as (corrupted=false):
8021q: adding VLAN 0 to HW filter on device batadv0
veth0_vlan: entered promiscuous mode
veth1_vlan: entered promiscuous mode
veth0_macvtap: entered promiscuous mode
veth1_macvtap: entered promiscuous mode
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278, CPU#1: syz-executor/18261
Modules linked in:
CPU: 1 UID: 0 PID: 18261 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278
Code: 83 c4 f8 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 07 84 c0 0f 85 ee 01 00 00 44 89 65 00 49 83 c5 08 eb 13 e8 57 d7 1e 00 90 <0f> 0b 90 eb 05 e8 4c d7 1e 00 45 31 ed 4c 89 e8 48 83 c4 28 5b 41
RSP: 0018:ffffc9000c14e380 EFLAGS: 00010293
RAX: ffffffff81a1fa59 RBX: 00003fffffffffff RCX: ffff888031350000
RDX: 0000000000000000 RSI: 00003fffffffffff RDI: 0000000000000000
RBP: 0000000000000012 R08: 0000000000000eac R09: 0000008cd3cb8148
R10: 0000008cd3cb8148 R11: 00004755c2000038 R12: 0000000000000012
R13: 0000000000000000 R14: ffffc9000c14e4c8 R15: 1ffffffff1c4aaa6
FS:  0000555590c21500(0000) GS:ffff8881259a3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000280 CR3: 000000007cc2c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 copy_data kernel/printk/printk_ringbuffer.c:1857 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1966 [inline]
 _prb_read_valid+0x672/0xa90 kernel/printk/printk_ringbuffer.c:2143
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2215
 printk_get_next_message+0x15c/0x7b0 kernel/printk/printk.c:2978
 console_emit_next_record kernel/printk/printk.c:3065 [inline]
 console_flush_one_record kernel/printk/printk.c:3197 [inline]
 console_flush_all+0x4cc/0xb10 kernel/printk/printk.c:3271
 __console_flush_and_unlock kernel/printk/printk.c:3301 [inline]
 console_unlock+0xbb/0x190 kernel/printk/printk.c:3341
 vprintk_emit+0x4c5/0x590 kernel/printk/printk.c:2423
 _printk+0xcf/0x120 kernel/printk/printk.c:2448
 batadv_hardif_activate_interface+0x17e/0x2a0 net/batman-adv/hard-interface.c:670
 batadv_hard_if_event+0x35f/0x1280 net/batman-adv/hard-interface.c:965
 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9752
 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3151
 rtnl_changelink net/core/rtnetlink.c:3769 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
 rtnl_newlink+0x1619/0x1c80 net/core/rtnetlink.c:4065
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6951
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 __sys_sendto+0x3bd/0x520 net/socket.c:2244
 __do_sys_sendto net/socket.c:2251 [inline]
 __se_sys_sendto net/socket.c:2247 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2247
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f80c3f90e5c
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffcc23ba880 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f80c4d14620 RCX: 00007f80c3f90e5c
RDX: 000000000000002c RSI: 00007f80c4d14670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffcc23ba8d4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f80c4d14670 R15: 0000000000000000
 </TASK>

final repro crashed as (corrupted=false):
8021q: adding VLAN 0 to HW filter on device batadv0
veth0_vlan: entered promiscuous mode
veth1_vlan: entered promiscuous mode
veth0_macvtap: entered promiscuous mode
veth1_macvtap: entered promiscuous mode
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278, CPU#1: syz-executor/18261
Modules linked in:
CPU: 1 UID: 0 PID: 18261 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278
Code: 83 c4 f8 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 07 84 c0 0f 85 ee 01 00 00 44 89 65 00 49 83 c5 08 eb 13 e8 57 d7 1e 00 90 <0f> 0b 90 eb 05 e8 4c d7 1e 00 45 31 ed 4c 89 e8 48 83 c4 28 5b 41
RSP: 0018:ffffc9000c14e380 EFLAGS: 00010293
RAX: ffffffff81a1fa59 RBX: 00003fffffffffff RCX: ffff888031350000
RDX: 0000000000000000 RSI: 00003fffffffffff RDI: 0000000000000000
RBP: 0000000000000012 R08: 0000000000000eac R09: 0000008cd3cb8148
R10: 0000008cd3cb8148 R11: 00004755c2000038 R12: 0000000000000012
R13: 0000000000000000 R14: ffffc9000c14e4c8 R15: 1ffffffff1c4aaa6
FS:  0000555590c21500(0000) GS:ffff8881259a3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000280 CR3: 000000007cc2c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 copy_data kernel/printk/printk_ringbuffer.c:1857 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1966 [inline]
 _prb_read_valid+0x672/0xa90 kernel/printk/printk_ringbuffer.c:2143
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2215
 printk_get_next_message+0x15c/0x7b0 kernel/printk/printk.c:2978
 console_emit_next_record kernel/printk/printk.c:3065 [inline]
 console_flush_one_record kernel/printk/printk.c:3197 [inline]
 console_flush_all+0x4cc/0xb10 kernel/printk/printk.c:3271
 __console_flush_and_unlock kernel/printk/printk.c:3301 [inline]
 console_unlock+0xbb/0x190 kernel/printk/printk.c:3341
 vprintk_emit+0x4c5/0x590 kernel/printk/printk.c:2423
 _printk+0xcf/0x120 kernel/printk/printk.c:2448
 batadv_hardif_activate_interface+0x17e/0x2a0 net/batman-adv/hard-interface.c:670
 batadv_hard_if_event+0x35f/0x1280 net/batman-adv/hard-interface.c:965
 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9752
 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3151
 rtnl_changelink net/core/rtnetlink.c:3769 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
 rtnl_newlink+0x1619/0x1c80 net/core/rtnetlink.c:4065
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6951
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 __sys_sendto+0x3bd/0x520 net/socket.c:2244
 __do_sys_sendto net/socket.c:2251 [inline]
 __se_sys_sendto net/socket.c:2247 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2247
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f80c3f90e5c
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffcc23ba880 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f80c4d14620 RCX: 00007f80c3f90e5c
RDX: 000000000000002c RSI: 00007f80c4d14670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffcc23ba8d4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f80c4d14670 R15: 0000000000000000
 </TASK>