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BUG: KMSAN: uninit-value in arch_stack_walk+0x1ad/0x3c0 arch/x86/kernel/stacktrace.c:21
 arch_stack_walk+0x1ad/0x3c0 arch/x86/kernel/stacktrace.c:21
 stack_trace_save+0x43/0x60 kernel/stacktrace.c:122
 kmsan_save_stack_with_flags mm/kmsan/core.c:80 [inline]
 kmsan_internal_chain_origin+0xa9/0x110 mm/kmsan/core.c:253
 kmsan_internal_memmove_metadata+0x201/0x350 mm/kmsan/core.c:164
 __msan_memcpy+0x65/0x90 mm/kmsan/instrumentation.c:145
 sock_write_iter+0x605/0x690 net/socket.c:1062
 do_iter_readv_writev+0xa7f/0xc70
 do_iter_write+0x52c/0x1500 fs/read_write.c:851
 vfs_writev fs/read_write.c:924 [inline]
 do_writev+0x645/0xe00 fs/read_write.c:967
 __do_sys_writev fs/read_write.c:1040 [inline]
 __se_sys_writev fs/read_write.c:1037 [inline]
 __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable regs created at:
 __bpf_prog_run32+0x84/0x180 kernel/bpf/core.c:1796
 bpf_dispatcher_nop_func include/linux/bpf.h:784 [inline]
 __bpf_prog_run include/linux/filter.h:626 [inline]
 bpf_prog_run include/linux/filter.h:633 [inline]
 __bpf_prog_run_save_cb+0x168/0x580 include/linux/filter.h:756

CPU: 1 PID: 18160 Comm: syz-executor.2 Not tainted 5.17.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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