syzbot

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BUG: KMSAN: uninit-value in ax25_transmit_buffer+0x328/0x410 net/ax25/ax25_out.c:348
 ax25_transmit_buffer+0x328/0x410 net/ax25/ax25_out.c:348
 ax25_send_control+0x62b/0x7c0 net/ax25/ax25_subr.c:179
 ax25_std_t1timer_expiry+0x5c4/0x660 net/ax25/ax25_std_timer.c:-1
 ax25_t1timer_expiry+0x152/0x180 net/ax25/ax25_timer.c:-1
 call_timer_fn+0x4c/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x82f/0xdf0 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0x3a/0x70 kernel/time/timer.c:2404
 handle_softirqs+0x171/0x7e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x65/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697
 size_mul include/linux/overflow.h:334 [inline]
 hash_stack lib/stackdepot.c:572 [inline]
 stack_depot_save_flags+0x54/0x790 lib/stackdepot.c:672
 stack_depot_save+0x12/0x20 lib/stackdepot.c:747
 __msan_poison_alloca+0x100/0x1a0 mm/kmsan/instrumentation.c:286
 __unix_dgram_recvmsg+0xbe/0x1750 net/unix/af_unix.c:2560
 unix_dgram_recvmsg+0x115/0x180 net/unix/af_unix.c:2672
 sock_recvmsg_nosec+0x1e2/0x270 net/socket.c:1078
 ____sys_recvmsg+0x4e5/0x620 net/socket.c:2810
 ___sys_recvmsg+0x20b/0x850 net/socket.c:2854
 do_recvmmsg+0x40e/0xdf0 net/socket.c:2949
 __sys_recvmmsg net/socket.c:3023 [inline]
 __do_sys_recvmmsg net/socket.c:3046 [inline]
 __se_sys_recvmmsg net/socket.c:3039 [inline]
 __x64_sys_recvmmsg+0x383/0x500 net/socket.c:3039
 x64_sys_call+0x96d/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 kmemdup_noprof+0xb0/0x100 mm/util.c:140
 kmemdup_noprof include/linux/fortify-string.h:763 [inline]
 ax25_send_frame+0x272/0x8a0 net/ax25/ax25_out.c:78
 rose_send_frame net/rose/rose_link.c:106 [inline]
 rose_transmit_restart_request net/rose/rose_link.c:198 [inline]
 rose_t0timer_expiry+0x342/0x830 net/rose/rose_link.c:83
 call_timer_fn+0x4c/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x82f/0xdf0 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0x3a/0x70 kernel/time/timer.c:2404
 handle_softirqs+0x171/0x7e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x65/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697

Uninit was stored to memory at:
 kmemdup_noprof+0xb0/0x100 mm/util.c:140
 kmemdup_noprof include/linux/fortify-string.h:763 [inline]
 ax25_send_frame+0x272/0x8a0 net/ax25/ax25_out.c:78
 rose_send_frame net/rose/rose_link.c:106 [inline]
 rose_transmit_restart_request net/rose/rose_link.c:198 [inline]
 rose_t0timer_expiry+0x342/0x830 net/rose/rose_link.c:83
 call_timer_fn+0x4c/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x82f/0xdf0 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0x3a/0x70 kernel/time/timer.c:2404
 handle_softirqs+0x171/0x7e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x65/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4545 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 __do_kmalloc_node mm/slub.c:5259 [inline]
 __kmalloc_node_track_caller_noprof+0x4f6/0x1750 mm/slub.c:5368
 kmemdup_noprof+0x48/0x100 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:763 [inline]
 ax25_send_frame+0x272/0x8a0 net/ax25/ax25_out.c:78
 rose_send_frame net/rose/rose_link.c:106 [inline]
 rose_transmit_restart_request net/rose/rose_link.c:198 [inline]
 rose_t0timer_expiry+0x342/0x830 net/rose/rose_link.c:83
 call_timer_fn+0x4c/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x82f/0xdf0 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0x3a/0x70 kernel/time/timer.c:2404
 handle_softirqs+0x171/0x7e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x65/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697

CPU: 1 UID: 0 PID: 9336 Comm: syz.5.698 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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